1 /*
2 * tkCanvLine.c --
3 *
4 * This file implements line items for canvas widgets.
5 *
6 * Copyright (c) 1991-1994 The Regents of the University of California.
7 * Copyright (c) 1994-1997 Sun Microsystems, Inc.
8 * Copyright (c) 1998-1999 by Scriptics Corporation.
9 *
10 * See the file "license.terms" for information on usage and redistribution of
11 * this file, and for a DISCLAIMER OF ALL WARRANTIES.
12 */
13
14 #include "tkInt.h"
15 #include "tkCanvas.h"
16 #include "default.h"
17
18 /*
19 * The structure below defines the record for each line item.
20 */
21
22 typedef enum {
23 ARROWS_NONE, ARROWS_FIRST, ARROWS_LAST, ARROWS_BOTH
24 } Arrows;
25
26 typedef struct LineItem {
27 Tk_Item header; /* Generic stuff that's the same for all
28 * types. MUST BE FIRST IN STRUCTURE. */
29 Tk_Outline outline; /* Outline structure */
30 Tk_Canvas canvas; /* Canvas containing item. Needed for parsing
31 * arrow shapes. */
32 int numPoints; /* Number of points in line (always >= 0). */
33 double *coordPtr; /* Pointer to malloc-ed array containing x-
34 * and y-coords of all points in line.
35 * X-coords are even-valued indices, y-coords
36 * are corresponding odd-valued indices. If
37 * the line has arrowheads then the first and
38 * last points have been adjusted to refer to
39 * the necks of the arrowheads rather than
40 * their tips. The actual endpoints are stored
41 * in the *firstArrowPtr and *lastArrowPtr, if
42 * they exist. */
43 int capStyle; /* Cap style for line. */
44 int joinStyle; /* Join style for line. */
45 GC arrowGC; /* Graphics context for drawing arrowheads. */
46 Arrows arrow; /* Indicates whether or not to draw arrowheads:
47 * "none", "first", "last", or "both". */
48 float arrowShapeA; /* Distance from tip of arrowhead to center. */
49 float arrowShapeB; /* Distance from tip of arrowhead to trailing
50 * point, measured along shaft. */
51 float arrowShapeC; /* Distance of trailing points from outside
52 * edge of shaft. */
53 double *firstArrowPtr; /* Points to array of PTS_IN_ARROW points
54 * describing polygon for arrowhead at first
55 * point in line. First point of arrowhead is
56 * tip. Malloc'ed. NULL means no arrowhead at
57 * first point. */
58 double *lastArrowPtr; /* Points to polygon for arrowhead at last
59 * point in line (PTS_IN_ARROW points, first
60 * of which is tip). Malloc'ed. NULL means no
61 * arrowhead at last point. */
62 const Tk_SmoothMethod *smooth; /* Non-zero means draw line smoothed (i.e.
63 * with Bezier splines). */
64 int splineSteps; /* Number of steps in each spline segment. */
65 } LineItem;
66
67 /*
68 * Number of points in an arrowHead:
69 */
70
71 #define PTS_IN_ARROW 6
72
73 /*
74 * Prototypes for functions defined in this file:
75 */
76
77 static int ArrowheadPostscript(Tcl_Interp *interp,
78 Tk_Canvas canvas, LineItem *linePtr,
79 double *arrowPtr, Tcl_Obj *psObj);
80 static void ComputeLineBbox(Tk_Canvas canvas, LineItem *linePtr);
81 static int ConfigureLine(Tcl_Interp *interp,
82 Tk_Canvas canvas, Tk_Item *itemPtr, int objc,
83 Tcl_Obj *const objv[], int flags);
84 static int ConfigureArrows(Tk_Canvas canvas, LineItem *linePtr);
85 static int CreateLine(Tcl_Interp *interp,
86 Tk_Canvas canvas, struct Tk_Item *itemPtr,
87 int objc, Tcl_Obj *const objv[]);
88 static void DeleteLine(Tk_Canvas canvas,
89 Tk_Item *itemPtr, Display *display);
90 static void DisplayLine(Tk_Canvas canvas,
91 Tk_Item *itemPtr, Display *display, Drawable dst,
92 int x, int y, int width, int height);
93 static int GetLineIndex(Tcl_Interp *interp,
94 Tk_Canvas canvas, Tk_Item *itemPtr,
95 Tcl_Obj *obj, int *indexPtr);
96 static int LineCoords(Tcl_Interp *interp,
97 Tk_Canvas canvas, Tk_Item *itemPtr,
98 int objc, Tcl_Obj *const objv[]);
99 static void LineDeleteCoords(Tk_Canvas canvas,
100 Tk_Item *itemPtr, int first, int last);
101 static void LineInsert(Tk_Canvas canvas,
102 Tk_Item *itemPtr, int beforeThis, Tcl_Obj *obj);
103 static int LineToArea(Tk_Canvas canvas,
104 Tk_Item *itemPtr, double *rectPtr);
105 static double LineToPoint(Tk_Canvas canvas,
106 Tk_Item *itemPtr, double *coordPtr);
107 static int LineToPostscript(Tcl_Interp *interp,
108 Tk_Canvas canvas, Tk_Item *itemPtr, int prepass);
109 static int ArrowParseProc(ClientData clientData,
110 Tcl_Interp *interp, Tk_Window tkwin,
111 const char *value, char *recordPtr, int offset);
112 static const char * ArrowPrintProc(ClientData clientData,
113 Tk_Window tkwin, char *recordPtr, int offset,
114 Tcl_FreeProc **freeProcPtr);
115 static int ParseArrowShape(ClientData clientData,
116 Tcl_Interp *interp, Tk_Window tkwin,
117 const char *value, char *recordPtr, int offset);
118 static const char * PrintArrowShape(ClientData clientData,
119 Tk_Window tkwin, char *recordPtr, int offset,
120 Tcl_FreeProc **freeProcPtr);
121 static void ScaleLine(Tk_Canvas canvas,
122 Tk_Item *itemPtr, double originX, double originY,
123 double scaleX, double scaleY);
124 static void TranslateLine(Tk_Canvas canvas,
125 Tk_Item *itemPtr, double deltaX, double deltaY);
126
127 /*
128 * Information used for parsing configuration specs. If you change any of the
129 * default strings, be sure to change the corresponding default values in
130 * CreateLine.
131 */
132
133 static const Tk_CustomOption arrowShapeOption = {
134 ParseArrowShape, PrintArrowShape, NULL
135 };
136 static const Tk_CustomOption arrowOption = {
137 ArrowParseProc, ArrowPrintProc, NULL
138 };
139 static const Tk_CustomOption smoothOption = {
140 TkSmoothParseProc, TkSmoothPrintProc, NULL
141 };
142 static const Tk_CustomOption stateOption = {
143 TkStateParseProc, TkStatePrintProc, INT2PTR(2)
144 };
145 static const Tk_CustomOption tagsOption = {
146 Tk_CanvasTagsParseProc, Tk_CanvasTagsPrintProc, NULL
147 };
148 static const Tk_CustomOption dashOption = {
149 TkCanvasDashParseProc, TkCanvasDashPrintProc, NULL
150 };
151 static const Tk_CustomOption offsetOption = {
152 TkOffsetParseProc, TkOffsetPrintProc,
153 INT2PTR(TK_OFFSET_RELATIVE|TK_OFFSET_INDEX)
154 };
155 static const Tk_CustomOption pixelOption = {
156 TkPixelParseProc, TkPixelPrintProc, NULL
157 };
158
159 static const Tk_ConfigSpec configSpecs[] = {
160 {TK_CONFIG_CUSTOM, "-activedash", NULL, NULL,
161 NULL, Tk_Offset(LineItem, outline.activeDash),
162 TK_CONFIG_NULL_OK, &dashOption},
163 {TK_CONFIG_COLOR, "-activefill", NULL, NULL,
164 NULL, Tk_Offset(LineItem, outline.activeColor), TK_CONFIG_NULL_OK, NULL},
165 {TK_CONFIG_BITMAP, "-activestipple", NULL, NULL,
166 NULL, Tk_Offset(LineItem, outline.activeStipple), TK_CONFIG_NULL_OK, NULL},
167 {TK_CONFIG_CUSTOM, "-activewidth", NULL, NULL,
168 "0.0", Tk_Offset(LineItem, outline.activeWidth),
169 TK_CONFIG_DONT_SET_DEFAULT, &pixelOption},
170 {TK_CONFIG_CUSTOM, "-arrow", NULL, NULL,
171 "none", Tk_Offset(LineItem, arrow),
172 TK_CONFIG_DONT_SET_DEFAULT, &arrowOption},
173 {TK_CONFIG_CUSTOM, "-arrowshape", NULL, NULL,
174 "8 10 3", Tk_Offset(LineItem, arrowShapeA),
175 TK_CONFIG_DONT_SET_DEFAULT, &arrowShapeOption},
176 {TK_CONFIG_CAP_STYLE, "-capstyle", NULL, NULL,
177 "butt", Tk_Offset(LineItem, capStyle), TK_CONFIG_DONT_SET_DEFAULT, NULL},
178 {TK_CONFIG_COLOR, "-fill", NULL, NULL,
179 DEF_CANVITEM_OUTLINE, Tk_Offset(LineItem, outline.color), TK_CONFIG_NULL_OK, NULL},
180 {TK_CONFIG_CUSTOM, "-dash", NULL, NULL,
181 NULL, Tk_Offset(LineItem, outline.dash),
182 TK_CONFIG_NULL_OK, &dashOption},
183 {TK_CONFIG_PIXELS, "-dashoffset", NULL, NULL,
184 "0", Tk_Offset(LineItem, outline.offset), TK_CONFIG_DONT_SET_DEFAULT, NULL},
185 {TK_CONFIG_CUSTOM, "-disableddash", NULL, NULL,
186 NULL, Tk_Offset(LineItem, outline.disabledDash),
187 TK_CONFIG_NULL_OK, &dashOption},
188 {TK_CONFIG_COLOR, "-disabledfill", NULL, NULL,
189 NULL, Tk_Offset(LineItem, outline.disabledColor), TK_CONFIG_NULL_OK, NULL},
190 {TK_CONFIG_BITMAP, "-disabledstipple", NULL, NULL,
191 NULL, Tk_Offset(LineItem, outline.disabledStipple), TK_CONFIG_NULL_OK, NULL},
192 {TK_CONFIG_CUSTOM, "-disabledwidth", NULL, NULL,
193 "0.0", Tk_Offset(LineItem, outline.disabledWidth),
194 TK_CONFIG_DONT_SET_DEFAULT, &pixelOption},
195 {TK_CONFIG_JOIN_STYLE, "-joinstyle", NULL, NULL,
196 "round", Tk_Offset(LineItem, joinStyle), TK_CONFIG_DONT_SET_DEFAULT, NULL},
197 {TK_CONFIG_CUSTOM, "-offset", NULL, NULL,
198 "0,0", Tk_Offset(LineItem, outline.tsoffset),
199 TK_CONFIG_DONT_SET_DEFAULT, &offsetOption},
200 {TK_CONFIG_CUSTOM, "-smooth", NULL, NULL,
201 "0", Tk_Offset(LineItem, smooth),
202 TK_CONFIG_DONT_SET_DEFAULT, &smoothOption},
203 {TK_CONFIG_INT, "-splinesteps", NULL, NULL,
204 "12", Tk_Offset(LineItem, splineSteps), TK_CONFIG_DONT_SET_DEFAULT, NULL},
205 {TK_CONFIG_CUSTOM, "-state", NULL, NULL,
206 NULL, Tk_Offset(Tk_Item, state), TK_CONFIG_NULL_OK, &stateOption},
207 {TK_CONFIG_BITMAP, "-stipple", NULL, NULL,
208 NULL, Tk_Offset(LineItem, outline.stipple), TK_CONFIG_NULL_OK, NULL},
209 {TK_CONFIG_CUSTOM, "-tags", NULL, NULL,
210 NULL, 0, TK_CONFIG_NULL_OK, &tagsOption},
211 {TK_CONFIG_CUSTOM, "-width", NULL, NULL,
212 "1.0", Tk_Offset(LineItem, outline.width),
213 TK_CONFIG_DONT_SET_DEFAULT, &pixelOption},
214 {TK_CONFIG_END, NULL, NULL, NULL, NULL, 0, 0, NULL}
215 };
216
217 /*
218 * The structures below defines the line item type by means of functions that
219 * can be invoked by generic item code.
220 */
221
222 Tk_ItemType tkLineType = {
223 "line", /* name */
224 sizeof(LineItem), /* itemSize */
225 CreateLine, /* createProc */
226 configSpecs, /* configSpecs */
227 ConfigureLine, /* configureProc */
228 LineCoords, /* coordProc */
229 DeleteLine, /* deleteProc */
230 DisplayLine, /* displayProc */
231 TK_CONFIG_OBJS | TK_MOVABLE_POINTS, /* flags */
232 LineToPoint, /* pointProc */
233 LineToArea, /* areaProc */
234 LineToPostscript, /* postscriptProc */
235 ScaleLine, /* scaleProc */
236 TranslateLine, /* translateProc */
237 GetLineIndex, /* indexProc */
238 NULL, /* icursorProc */
239 NULL, /* selectionProc */
240 LineInsert, /* insertProc */
241 LineDeleteCoords, /* dTextProc */
242 NULL, /* nextPtr */
243 NULL, 0, NULL, NULL
244 };
245
246 /*
247 * The definition below determines how large are static arrays used to hold
248 * spline points (splines larger than this have to have their arrays
249 * malloc-ed).
250 */
251
252 #define MAX_STATIC_POINTS 200
253
254 /*
255 *--------------------------------------------------------------
256 *
257 * CreateLine --
258 *
259 * This function is invoked to create a new line item in a canvas.
260 *
261 * Results:
262 * A standard Tcl return value. If an error occurred in creating the
263 * item, then an error message is left in the interp's result; in this
264 * case itemPtr is left uninitialized, so it can be safely freed by the
265 * caller.
266 *
267 * Side effects:
268 * A new line item is created.
269 *
270 *--------------------------------------------------------------
271 */
272
273 static int
CreateLine(Tcl_Interp * interp,Tk_Canvas canvas,Tk_Item * itemPtr,int objc,Tcl_Obj * const objv[])274 CreateLine(
275 Tcl_Interp *interp, /* Interpreter for error reporting. */
276 Tk_Canvas canvas, /* Canvas to hold new item. */
277 Tk_Item *itemPtr, /* Record to hold new item; header has been
278 * initialized by caller. */
279 int objc, /* Number of arguments in objv. */
280 Tcl_Obj *const objv[]) /* Arguments describing line. */
281 {
282 LineItem *linePtr = (LineItem *) itemPtr;
283 int i;
284
285 if (objc == 0) {
286 Tcl_Panic("canvas did not pass any coords");
287 }
288
289 /*
290 * Carry out initialization that is needed to set defaults and to allow
291 * proper cleanup after errors during the the remainder of this function.
292 */
293
294 Tk_CreateOutline(&linePtr->outline);
295 linePtr->canvas = canvas;
296 linePtr->numPoints = 0;
297 linePtr->coordPtr = NULL;
298 linePtr->capStyle = CapButt;
299 linePtr->joinStyle = JoinRound;
300 linePtr->arrowGC = NULL;
301 linePtr->arrow = ARROWS_NONE;
302 linePtr->arrowShapeA = (float)8.0;
303 linePtr->arrowShapeB = (float)10.0;
304 linePtr->arrowShapeC = (float)3.0;
305 linePtr->firstArrowPtr = NULL;
306 linePtr->lastArrowPtr = NULL;
307 linePtr->smooth = NULL;
308 linePtr->splineSteps = 12;
309
310 /*
311 * Count the number of points and then parse them into a point array.
312 * Leading arguments are assumed to be points if they start with a digit
313 * or a minus sign followed by a digit.
314 */
315
316 for (i = 1; i < objc; i++) {
317 const char *arg = Tcl_GetString(objv[i]);
318
319 if ((arg[0] == '-') && (arg[1] >= 'a') && (arg[1] <= 'z')) {
320 break;
321 }
322 }
323 if (LineCoords(interp, canvas, itemPtr, i, objv) != TCL_OK) {
324 goto error;
325 }
326 if (ConfigureLine(interp, canvas, itemPtr, objc-i, objv+i, 0) == TCL_OK) {
327 return TCL_OK;
328 }
329
330 error:
331 DeleteLine(canvas, itemPtr, Tk_Display(Tk_CanvasTkwin(canvas)));
332 return TCL_ERROR;
333 }
334
335 /*
336 *--------------------------------------------------------------
337 *
338 * LineCoords --
339 *
340 * This function is invoked to process the "coords" widget command on
341 * lines. See the user documentation for details on what it does.
342 *
343 * Results:
344 * Returns TCL_OK or TCL_ERROR, and sets the interp's result.
345 *
346 * Side effects:
347 * The coordinates for the given item may be changed.
348 *
349 *--------------------------------------------------------------
350 */
351
352 static int
LineCoords(Tcl_Interp * interp,Tk_Canvas canvas,Tk_Item * itemPtr,int objc,Tcl_Obj * const objv[])353 LineCoords(
354 Tcl_Interp *interp, /* Used for error reporting. */
355 Tk_Canvas canvas, /* Canvas containing item. */
356 Tk_Item *itemPtr, /* Item whose coordinates are to be read or
357 * modified. */
358 int objc, /* Number of coordinates supplied in objv. */
359 Tcl_Obj *const objv[]) /* Array of coordinates: x1, y1, x2, y2, ... */
360 {
361 LineItem *linePtr = (LineItem *) itemPtr;
362 int i, numPoints;
363 double *coordPtr;
364
365 if (objc == 0) {
366 int numCoords;
367 Tcl_Obj *subobj, *obj = Tcl_NewObj();
368
369 numCoords = 2*linePtr->numPoints;
370 if (linePtr->firstArrowPtr != NULL) {
371 coordPtr = linePtr->firstArrowPtr;
372 } else {
373 coordPtr = linePtr->coordPtr;
374 }
375 for (i = 0; i < numCoords; i++, coordPtr++) {
376 if (i == 2) {
377 coordPtr = linePtr->coordPtr+2;
378 }
379 if ((linePtr->lastArrowPtr != NULL) && (i == (numCoords-2))) {
380 coordPtr = linePtr->lastArrowPtr;
381 }
382 subobj = Tcl_NewDoubleObj(*coordPtr);
383 Tcl_ListObjAppendElement(interp, obj, subobj);
384 }
385 Tcl_SetObjResult(interp, obj);
386 return TCL_OK;
387 }
388 if (objc == 1) {
389 if (Tcl_ListObjGetElements(interp, objv[0], &objc,
390 (Tcl_Obj ***) &objv) != TCL_OK) {
391 return TCL_ERROR;
392 }
393 }
394 if (objc & 1) {
395 Tcl_SetObjResult(interp, Tcl_ObjPrintf(
396 "wrong # coordinates: expected an even number, got %d",
397 objc));
398 Tcl_SetErrorCode(interp, "TK", "CANVAS", "COORDS", "LINE", NULL);
399 return TCL_ERROR;
400 } else if (objc < 4) {
401 Tcl_SetObjResult(interp, Tcl_ObjPrintf(
402 "wrong # coordinates: expected at least 4, got %d", objc));
403 Tcl_SetErrorCode(interp, "TK", "CANVAS", "COORDS", "LINE", NULL);
404 return TCL_ERROR;
405 }
406
407 numPoints = objc/2;
408 if (linePtr->numPoints != numPoints) {
409 coordPtr = (double *)ckalloc(sizeof(double) * objc);
410 if (linePtr->coordPtr != NULL) {
411 ckfree(linePtr->coordPtr);
412 }
413 linePtr->coordPtr = coordPtr;
414 linePtr->numPoints = numPoints;
415 }
416 coordPtr = linePtr->coordPtr;
417 for (i = 0; i < objc ; i++) {
418 if (Tk_CanvasGetCoordFromObj(interp, canvas, objv[i],
419 coordPtr++) != TCL_OK) {
420 return TCL_ERROR;
421 }
422 }
423
424 /*
425 * Update arrowheads by throwing away any existing arrow-head information
426 * and calling ConfigureArrows to recompute it.
427 */
428
429 if (linePtr->firstArrowPtr != NULL) {
430 ckfree(linePtr->firstArrowPtr);
431 linePtr->firstArrowPtr = NULL;
432 }
433 if (linePtr->lastArrowPtr != NULL) {
434 ckfree(linePtr->lastArrowPtr);
435 linePtr->lastArrowPtr = NULL;
436 }
437 if (linePtr->arrow != ARROWS_NONE) {
438 ConfigureArrows(canvas, linePtr);
439 }
440 ComputeLineBbox(canvas, linePtr);
441 return TCL_OK;
442 }
443
444 /*
445 *--------------------------------------------------------------
446 *
447 * ConfigureLine --
448 *
449 * This function is invoked to configure various aspects of a line item
450 * such as its background color.
451 *
452 * Results:
453 * A standard Tcl result code. If an error occurs, then an error message
454 * is left in the interp's result.
455 *
456 * Side effects:
457 * Configuration information, such as colors and stipple patterns, may be
458 * set for itemPtr.
459 *
460 *--------------------------------------------------------------
461 */
462
463 static int
ConfigureLine(Tcl_Interp * interp,Tk_Canvas canvas,Tk_Item * itemPtr,int objc,Tcl_Obj * const objv[],int flags)464 ConfigureLine(
465 Tcl_Interp *interp, /* Used for error reporting. */
466 Tk_Canvas canvas, /* Canvas containing itemPtr. */
467 Tk_Item *itemPtr, /* Line item to reconfigure. */
468 int objc, /* Number of elements in objv. */
469 Tcl_Obj *const objv[], /* Arguments describing things to configure. */
470 int flags) /* Flags to pass to Tk_ConfigureWidget. */
471 {
472 LineItem *linePtr = (LineItem *) itemPtr;
473 XGCValues gcValues;
474 GC newGC, arrowGC;
475 unsigned long mask;
476 Tk_Window tkwin;
477 Tk_State state;
478
479 tkwin = Tk_CanvasTkwin(canvas);
480 if (TCL_OK != Tk_ConfigureWidget(interp, tkwin, configSpecs, objc,
481 (const char **) objv, (char *) linePtr, flags|TK_CONFIG_OBJS)) {
482 return TCL_ERROR;
483 }
484
485 /*
486 * A few of the options require additional processing, such as graphics
487 * contexts.
488 */
489
490 state = itemPtr->state;
491
492 if (state == TK_STATE_NULL) {
493 state = Canvas(canvas)->canvas_state;
494 }
495
496 if (linePtr->outline.activeWidth > linePtr->outline.width ||
497 linePtr->outline.activeDash.number != 0 ||
498 linePtr->outline.activeColor != NULL ||
499 linePtr->outline.activeStipple != None) {
500 itemPtr->redraw_flags |= TK_ITEM_STATE_DEPENDANT;
501 } else {
502 itemPtr->redraw_flags &= ~TK_ITEM_STATE_DEPENDANT;
503 }
504 mask = Tk_ConfigOutlineGC(&gcValues, canvas, itemPtr, &linePtr->outline);
505 if (mask) {
506 if (linePtr->arrow == ARROWS_NONE) {
507 gcValues.cap_style = linePtr->capStyle;
508 mask |= GCCapStyle;
509 }
510 gcValues.join_style = linePtr->joinStyle;
511 mask |= GCJoinStyle;
512 newGC = Tk_GetGC(tkwin, mask, &gcValues);
513 #ifdef MAC_OSX_TK
514 /*
515 * Mac OS X CG drawing needs access to linewidth even for arrow fills
516 * (as linewidth controls antialiasing).
517 */
518
519 mask |= GCLineWidth;
520 #else
521 gcValues.line_width = 0;
522 #endif
523 arrowGC = Tk_GetGC(tkwin, mask, &gcValues);
524 } else {
525 newGC = arrowGC = NULL;
526 }
527 if (linePtr->outline.gc != NULL) {
528 Tk_FreeGC(Tk_Display(tkwin), linePtr->outline.gc);
529 }
530 if (linePtr->arrowGC != NULL) {
531 Tk_FreeGC(Tk_Display(tkwin), linePtr->arrowGC);
532 }
533 linePtr->outline.gc = newGC;
534 linePtr->arrowGC = arrowGC;
535
536 /*
537 * Keep spline parameters within reasonable limits.
538 */
539
540 if (linePtr->splineSteps < 1) {
541 linePtr->splineSteps = 1;
542 } else if (linePtr->splineSteps > 100) {
543 linePtr->splineSteps = 100;
544 }
545
546 if ((!linePtr->numPoints) || (state == TK_STATE_HIDDEN)) {
547 ComputeLineBbox(canvas, linePtr);
548 return TCL_OK;
549 }
550
551 /*
552 * Setup arrowheads, if needed. If arrowheads are turned off, restore the
553 * line's endpoints (they were shortened when the arrowheads were added).
554 */
555
556 if ((linePtr->firstArrowPtr != NULL) && (linePtr->arrow != ARROWS_FIRST)
557 && (linePtr->arrow != ARROWS_BOTH)) {
558 linePtr->coordPtr[0] = linePtr->firstArrowPtr[0];
559 linePtr->coordPtr[1] = linePtr->firstArrowPtr[1];
560 ckfree(linePtr->firstArrowPtr);
561 linePtr->firstArrowPtr = NULL;
562 }
563 if ((linePtr->lastArrowPtr != NULL) && (linePtr->arrow != ARROWS_LAST)
564 && (linePtr->arrow != ARROWS_BOTH)) {
565 int i;
566
567 i = 2*(linePtr->numPoints-1);
568 linePtr->coordPtr[i] = linePtr->lastArrowPtr[0];
569 linePtr->coordPtr[i+1] = linePtr->lastArrowPtr[1];
570 ckfree(linePtr->lastArrowPtr);
571 linePtr->lastArrowPtr = NULL;
572 }
573 if (linePtr->arrow != ARROWS_NONE) {
574 ConfigureArrows(canvas, linePtr);
575 }
576
577 /*
578 * Recompute bounding box for line.
579 */
580
581 ComputeLineBbox(canvas, linePtr);
582
583 return TCL_OK;
584 }
585
586 /*
587 *--------------------------------------------------------------
588 *
589 * DeleteLine --
590 *
591 * This function is called to clean up the data structure associated with
592 * a line item.
593 *
594 * Results:
595 * None.
596 *
597 * Side effects:
598 * Resources associated with itemPtr are released.
599 *
600 *--------------------------------------------------------------
601 */
602
603 static void
DeleteLine(TCL_UNUSED (Tk_Canvas),Tk_Item * itemPtr,Display * display)604 DeleteLine(
605 TCL_UNUSED(Tk_Canvas), /* Info about overall canvas widget. */
606 Tk_Item *itemPtr, /* Item that is being deleted. */
607 Display *display) /* Display containing window for canvas. */
608 {
609 LineItem *linePtr = (LineItem *) itemPtr;
610
611 Tk_DeleteOutline(display, &linePtr->outline);
612 if (linePtr->coordPtr != NULL) {
613 ckfree(linePtr->coordPtr);
614 }
615 if (linePtr->arrowGC != NULL) {
616 Tk_FreeGC(display, linePtr->arrowGC);
617 }
618 if (linePtr->firstArrowPtr != NULL) {
619 ckfree(linePtr->firstArrowPtr);
620 }
621 if (linePtr->lastArrowPtr != NULL) {
622 ckfree(linePtr->lastArrowPtr);
623 }
624 }
625
626 /*
627 *--------------------------------------------------------------
628 *
629 * ComputeLineBbox --
630 *
631 * This function is invoked to compute the bounding box of all the pixels
632 * that may be drawn as part of a line.
633 *
634 * Results:
635 * None.
636 *
637 * Side effects:
638 * The fields x1, y1, x2, and y2 are updated in the header for itemPtr.
639 *
640 *--------------------------------------------------------------
641 */
642
643 static void
ComputeLineBbox(Tk_Canvas canvas,LineItem * linePtr)644 ComputeLineBbox(
645 Tk_Canvas canvas, /* Canvas that contains item. */
646 LineItem *linePtr) /* Item whose bbos is to be recomputed. */
647 {
648 double *coordPtr;
649 int i, intWidth;
650 double width;
651 Tk_State state = linePtr->header.state;
652 Tk_TSOffset *tsoffset;
653
654 if (state == TK_STATE_NULL) {
655 state = Canvas(canvas)->canvas_state;
656 }
657
658 if (!(linePtr->numPoints) || (state == TK_STATE_HIDDEN)) {
659 linePtr->header.x1 = -1;
660 linePtr->header.x2 = -1;
661 linePtr->header.y1 = -1;
662 linePtr->header.y2 = -1;
663 return;
664 }
665
666 width = linePtr->outline.width;
667 if (Canvas(canvas)->currentItemPtr == (Tk_Item *)linePtr) {
668 if (linePtr->outline.activeWidth > width) {
669 width = linePtr->outline.activeWidth;
670 }
671 } else if (state == TK_STATE_DISABLED) {
672 if (linePtr->outline.disabledWidth > 0) {
673 width = linePtr->outline.disabledWidth;
674 }
675 }
676
677 coordPtr = linePtr->coordPtr;
678 linePtr->header.x1 = linePtr->header.x2 = (int) coordPtr[0];
679 linePtr->header.y1 = linePtr->header.y2 = (int) coordPtr[1];
680
681 /*
682 * Compute the bounding box of all the points in the line, then expand in
683 * all directions by the line's width to take care of butting or rounded
684 * corners and projecting or rounded caps. This expansion is an
685 * overestimate (worst-case is square root of two over two) but it's
686 * simple. Don't do anything special for curves. This causes an additional
687 * overestimate in the bounding box, but is faster.
688 */
689
690 for (i = 1, coordPtr = linePtr->coordPtr+2; i < linePtr->numPoints;
691 i++, coordPtr += 2) {
692 TkIncludePoint((Tk_Item *) linePtr, coordPtr);
693 }
694 width = linePtr->outline.width;
695 if (width < 1.0) {
696 width = 1.0;
697 }
698 if (linePtr->arrow != ARROWS_NONE) {
699 if (linePtr->arrow != ARROWS_LAST) {
700 TkIncludePoint((Tk_Item *) linePtr, linePtr->firstArrowPtr);
701 }
702 if (linePtr->arrow != ARROWS_FIRST) {
703 TkIncludePoint((Tk_Item *) linePtr, linePtr->lastArrowPtr);
704 }
705 }
706
707 tsoffset = &linePtr->outline.tsoffset;
708 if (tsoffset->flags & TK_OFFSET_INDEX) {
709 coordPtr = linePtr->coordPtr
710 + (tsoffset->flags & ~TK_OFFSET_INDEX);
711
712 if (tsoffset->flags <= 0) {
713 coordPtr = linePtr->coordPtr;
714 if ((linePtr->arrow == ARROWS_FIRST)
715 || (linePtr->arrow == ARROWS_BOTH)) {
716 coordPtr = linePtr->firstArrowPtr;
717 }
718 }
719 if (tsoffset->flags > (linePtr->numPoints * 2)) {
720 coordPtr = linePtr->coordPtr + (linePtr->numPoints * 2);
721 if ((linePtr->arrow == ARROWS_LAST)
722 || (linePtr->arrow == ARROWS_BOTH)) {
723 coordPtr = linePtr->lastArrowPtr;
724 }
725 }
726 tsoffset->xoffset = (int) (coordPtr[0] + 0.5);
727 tsoffset->yoffset = (int) (coordPtr[1] + 0.5);
728 } else {
729 if (tsoffset->flags & TK_OFFSET_LEFT) {
730 tsoffset->xoffset = linePtr->header.x1;
731 } else if (tsoffset->flags & TK_OFFSET_CENTER) {
732 tsoffset->xoffset = (linePtr->header.x1 + linePtr->header.x2)/2;
733 } else if (tsoffset->flags & TK_OFFSET_RIGHT) {
734 tsoffset->xoffset = linePtr->header.x2;
735 }
736 if (tsoffset->flags & TK_OFFSET_TOP) {
737 tsoffset->yoffset = linePtr->header.y1;
738 } else if (tsoffset->flags & TK_OFFSET_MIDDLE) {
739 tsoffset->yoffset = (linePtr->header.y1 + linePtr->header.y2)/2;
740 } else if (tsoffset->flags & TK_OFFSET_BOTTOM) {
741 tsoffset->yoffset = linePtr->header.y2;
742 }
743 }
744
745 intWidth = (int) (width + 0.5);
746 linePtr->header.x1 -= intWidth;
747 linePtr->header.x2 += intWidth;
748 linePtr->header.y1 -= intWidth;
749 linePtr->header.y2 += intWidth;
750
751 if (linePtr->numPoints == 1) {
752 linePtr->header.x1 -= 1;
753 linePtr->header.x2 += 1;
754 linePtr->header.y1 -= 1;
755 linePtr->header.y2 += 1;
756 return;
757 }
758
759 /*
760 * For mitered lines, make a second pass through all the points. Compute
761 * the locations of the two miter vertex points and add those into the
762 * bounding box.
763 */
764
765 if (linePtr->joinStyle == JoinMiter) {
766 for (i = linePtr->numPoints, coordPtr = linePtr->coordPtr; i >= 3;
767 i--, coordPtr += 2) {
768 double miter[4];
769 int j;
770
771 if (TkGetMiterPoints(coordPtr, coordPtr+2, coordPtr+4,
772 width, miter, miter+2)) {
773 for (j = 0; j < 4; j += 2) {
774 TkIncludePoint((Tk_Item *) linePtr, miter+j);
775 }
776 }
777 }
778 }
779
780 /*
781 * Add in the sizes of arrowheads, if any.
782 */
783
784 if (linePtr->arrow != ARROWS_NONE) {
785 if (linePtr->arrow != ARROWS_LAST) {
786 for (i = 0, coordPtr = linePtr->firstArrowPtr; i < PTS_IN_ARROW;
787 i++, coordPtr += 2) {
788 TkIncludePoint((Tk_Item *) linePtr, coordPtr);
789 }
790 }
791 if (linePtr->arrow != ARROWS_FIRST) {
792 for (i = 0, coordPtr = linePtr->lastArrowPtr; i < PTS_IN_ARROW;
793 i++, coordPtr += 2) {
794 TkIncludePoint((Tk_Item *) linePtr, coordPtr);
795 }
796 }
797 }
798
799 /*
800 * Add one more pixel of fudge factor just to be safe (e.g. X may round
801 * differently than we do).
802 */
803
804 linePtr->header.x1 -= 1;
805 linePtr->header.x2 += 1;
806 linePtr->header.y1 -= 1;
807 linePtr->header.y2 += 1;
808 }
809
810 /*
811 *--------------------------------------------------------------
812 *
813 * DisplayLine --
814 *
815 * This function is invoked to draw a line item in a given drawable.
816 *
817 * Results:
818 * None.
819 *
820 * Side effects:
821 * ItemPtr is drawn in drawable using the transformation information in
822 * canvas.
823 *
824 *--------------------------------------------------------------
825 */
826
827 static void
DisplayLine(Tk_Canvas canvas,Tk_Item * itemPtr,Display * display,Drawable drawable,TCL_UNUSED (int),TCL_UNUSED (int),TCL_UNUSED (int),TCL_UNUSED (int))828 DisplayLine(
829 Tk_Canvas canvas, /* Canvas that contains item. */
830 Tk_Item *itemPtr, /* Item to be displayed. */
831 Display *display, /* Display on which to draw item. */
832 Drawable drawable, /* Pixmap or window in which to draw item. */
833 TCL_UNUSED(int), /* Describes region of canvas that must be */
834 TCL_UNUSED(int), /* redisplayed (not used). */
835 TCL_UNUSED(int),
836 TCL_UNUSED(int))
837 {
838 LineItem *linePtr = (LineItem *) itemPtr;
839 XPoint staticPoints[MAX_STATIC_POINTS*3];
840 XPoint *pointPtr;
841 double linewidth;
842 int numPoints;
843 Tk_State state = itemPtr->state;
844
845 if (!linePtr->numPoints || (linePtr->outline.gc == NULL)) {
846 return;
847 }
848
849 if (state == TK_STATE_NULL) {
850 state = Canvas(canvas)->canvas_state;
851 }
852 linewidth = linePtr->outline.width;
853 if (Canvas(canvas)->currentItemPtr == itemPtr) {
854 if (linePtr->outline.activeWidth != linewidth) {
855 linewidth = linePtr->outline.activeWidth;
856 }
857 } else if (state == TK_STATE_DISABLED) {
858 if (linePtr->outline.disabledWidth != linewidth) {
859 linewidth = linePtr->outline.disabledWidth;
860 }
861 }
862 /*
863 * Build up an array of points in screen coordinates. Use a static array
864 * unless the line has an enormous number of points; in this case,
865 * dynamically allocate an array. For smoothed lines, generate the curve
866 * points on each redisplay.
867 */
868
869 if ((linePtr->smooth) && (linePtr->numPoints > 2)) {
870 numPoints = linePtr->smooth->coordProc(canvas, NULL,
871 linePtr->numPoints, linePtr->splineSteps, NULL, NULL);
872 } else {
873 numPoints = linePtr->numPoints;
874 }
875
876 if (numPoints <= MAX_STATIC_POINTS) {
877 pointPtr = staticPoints;
878 } else {
879 pointPtr = (XPoint *)ckalloc(numPoints * 3 * sizeof(XPoint));
880 }
881
882 if ((linePtr->smooth) && (linePtr->numPoints > 2)) {
883 numPoints = linePtr->smooth->coordProc(canvas, linePtr->coordPtr,
884 linePtr->numPoints, linePtr->splineSteps, pointPtr, NULL);
885 } else {
886 numPoints = TkCanvTranslatePath((TkCanvas *) canvas, numPoints,
887 linePtr->coordPtr, 0, pointPtr);
888 }
889
890 /*
891 * Display line, the free up line storage if it was dynamically allocated.
892 * If we're stippling, then modify the stipple offset in the GC. Be sure
893 * to reset the offset when done, since the GC is supposed to be
894 * read-only.
895 */
896
897 if (Tk_ChangeOutlineGC(canvas, itemPtr, &linePtr->outline)) {
898 Tk_CanvasSetOffset(canvas, linePtr->arrowGC,
899 &linePtr->outline.tsoffset);
900 }
901 if (numPoints > 1) {
902 XDrawLines(display, drawable, linePtr->outline.gc, pointPtr, numPoints,
903 CoordModeOrigin);
904 } else {
905 int intwidth = (int) (linewidth + 0.5);
906
907 if (intwidth < 1) {
908 intwidth = 1;
909 }
910 XFillArc(display, drawable, linePtr->outline.gc,
911 pointPtr->x - intwidth/2, pointPtr->y - intwidth/2,
912 (unsigned) intwidth+1, (unsigned) intwidth+1, 0, 64*360);
913 }
914 if (pointPtr != staticPoints) {
915 ckfree(pointPtr);
916 }
917
918 /*
919 * Display arrowheads, if they are wanted.
920 */
921
922 if (linePtr->firstArrowPtr != NULL) {
923 TkFillPolygon(canvas, linePtr->firstArrowPtr, PTS_IN_ARROW,
924 display, drawable, linePtr->arrowGC, NULL);
925 }
926 if (linePtr->lastArrowPtr != NULL) {
927 TkFillPolygon(canvas, linePtr->lastArrowPtr, PTS_IN_ARROW,
928 display, drawable, linePtr->arrowGC, NULL);
929 }
930 if (Tk_ResetOutlineGC(canvas, itemPtr, &linePtr->outline)) {
931 XSetTSOrigin(display, linePtr->arrowGC, 0, 0);
932 }
933 }
934
935 /*
936 *--------------------------------------------------------------
937 *
938 * LineInsert --
939 *
940 * Insert coords into a line item at a given index.
941 *
942 * Results:
943 * None.
944 *
945 * Side effects:
946 * The coords in the given item is modified.
947 *
948 *--------------------------------------------------------------
949 */
950
951 static void
LineInsert(Tk_Canvas canvas,Tk_Item * itemPtr,int beforeThis,Tcl_Obj * obj)952 LineInsert(
953 Tk_Canvas canvas, /* Canvas containing text item. */
954 Tk_Item *itemPtr, /* Line item to be modified. */
955 int beforeThis, /* Index before which new coordinates are to
956 * be inserted. */
957 Tcl_Obj *obj) /* New coordinates to be inserted. */
958 {
959 LineItem *linePtr = (LineItem *) itemPtr;
960 int length, objc, i;
961 double *newCoordPtr, *coordPtr;
962 Tk_State state = itemPtr->state;
963 Tcl_Obj **objv;
964
965 if (state == TK_STATE_NULL) {
966 state = Canvas(canvas)->canvas_state;
967 }
968
969 if (!obj || (Tcl_ListObjGetElements(NULL, obj, &objc, &objv) != TCL_OK)
970 || !objc || objc&1) {
971 return;
972 }
973 length = 2*linePtr->numPoints;
974 if (beforeThis < 0) {
975 beforeThis = 0;
976 }
977 if (beforeThis > length) {
978 beforeThis = length;
979 }
980 if (linePtr->firstArrowPtr != NULL) {
981 linePtr->coordPtr[0] = linePtr->firstArrowPtr[0];
982 linePtr->coordPtr[1] = linePtr->firstArrowPtr[1];
983 }
984 if (linePtr->lastArrowPtr != NULL) {
985 linePtr->coordPtr[length-2] = linePtr->lastArrowPtr[0];
986 linePtr->coordPtr[length-1] = linePtr->lastArrowPtr[1];
987 }
988 newCoordPtr = (double *)ckalloc(sizeof(double) * (length + objc));
989 for (i=0; i<beforeThis; i++) {
990 newCoordPtr[i] = linePtr->coordPtr[i];
991 }
992 for (i=0; i<objc; i++) {
993 if (Tcl_GetDoubleFromObj(NULL, objv[i],
994 &newCoordPtr[i + beforeThis]) != TCL_OK) {
995 Tcl_ResetResult(Canvas(canvas)->interp);
996 ckfree(newCoordPtr);
997 return;
998 }
999 }
1000
1001 for (i=beforeThis; i<length; i++) {
1002 newCoordPtr[i+objc] = linePtr->coordPtr[i];
1003 }
1004 if (linePtr->coordPtr) {
1005 ckfree(linePtr->coordPtr);
1006 }
1007 linePtr->coordPtr = newCoordPtr;
1008 length += objc ;
1009 linePtr->numPoints = length / 2;
1010
1011 if ((length > 3) && (state != TK_STATE_HIDDEN)) {
1012 /*
1013 * This is some optimizing code that will result that only the part of
1014 * the polygon that changed (and the objects that are overlapping with
1015 * that part) need to be redrawn. A special flag is set that instructs
1016 * the general canvas code not to redraw the whole object. If this
1017 * flag is not set, the canvas will do the redrawing, otherwise I have
1018 * to do it here.
1019 */
1020
1021 itemPtr->redraw_flags |= TK_ITEM_DONT_REDRAW;
1022
1023 if (beforeThis > 0) {
1024 beforeThis -= 2;
1025 objc += 2;
1026 }
1027 if (beforeThis+objc < length) {
1028 objc += 2;
1029 }
1030 if (linePtr->smooth) {
1031 if (beforeThis > 0) {
1032 beforeThis -= 2;
1033 objc += 2;
1034 }
1035 if (beforeThis+objc+2 < length) {
1036 objc += 2;
1037 }
1038 }
1039 itemPtr->x1 = itemPtr->x2 = (int) linePtr->coordPtr[beforeThis];
1040 itemPtr->y1 = itemPtr->y2 = (int) linePtr->coordPtr[beforeThis+1];
1041 if ((linePtr->firstArrowPtr != NULL) && (beforeThis < 1)) {
1042 /*
1043 * Include old first arrow.
1044 */
1045
1046 for (i = 0, coordPtr = linePtr->firstArrowPtr; i < PTS_IN_ARROW;
1047 i++, coordPtr += 2) {
1048 TkIncludePoint(itemPtr, coordPtr);
1049 }
1050 }
1051 if ((linePtr->lastArrowPtr != NULL) && (beforeThis+objc >= length)) {
1052 /*
1053 * Include old last arrow.
1054 */
1055
1056 for (i = 0, coordPtr = linePtr->lastArrowPtr; i < PTS_IN_ARROW;
1057 i++, coordPtr += 2) {
1058 TkIncludePoint(itemPtr, coordPtr);
1059 }
1060 }
1061 coordPtr = linePtr->coordPtr + beforeThis + 2;
1062 for (i=2; i<objc; i+=2) {
1063 TkIncludePoint(itemPtr, coordPtr);
1064 coordPtr += 2;
1065 }
1066 }
1067 if (linePtr->firstArrowPtr != NULL) {
1068 ckfree(linePtr->firstArrowPtr);
1069 linePtr->firstArrowPtr = NULL;
1070 }
1071 if (linePtr->lastArrowPtr != NULL) {
1072 ckfree(linePtr->lastArrowPtr);
1073 linePtr->lastArrowPtr = NULL;
1074 }
1075 if (linePtr->arrow != ARROWS_NONE) {
1076 ConfigureArrows(canvas, linePtr);
1077 }
1078
1079 if (itemPtr->redraw_flags & TK_ITEM_DONT_REDRAW) {
1080 double width;
1081 int intWidth;
1082
1083 if ((linePtr->firstArrowPtr != NULL) && (beforeThis > 2)) {
1084 /*
1085 * Include new first arrow.
1086 */
1087
1088 for (i = 0, coordPtr = linePtr->firstArrowPtr; i < PTS_IN_ARROW;
1089 i++, coordPtr += 2) {
1090 TkIncludePoint(itemPtr, coordPtr);
1091 }
1092 }
1093 if ((linePtr->lastArrowPtr != NULL) && (beforeThis+objc < length-2)) {
1094 /*
1095 * Include new right arrow.
1096 */
1097
1098 for (i = 0, coordPtr = linePtr->lastArrowPtr; i < PTS_IN_ARROW;
1099 i++, coordPtr += 2) {
1100 TkIncludePoint(itemPtr, coordPtr);
1101 }
1102 }
1103 width = linePtr->outline.width;
1104 if (Canvas(canvas)->currentItemPtr == itemPtr) {
1105 if (linePtr->outline.activeWidth > width) {
1106 width = linePtr->outline.activeWidth;
1107 }
1108 } else if (state == TK_STATE_DISABLED) {
1109 if (linePtr->outline.disabledWidth > 0) {
1110 width = linePtr->outline.disabledWidth;
1111 }
1112 }
1113 intWidth = (int) (width + 0.5);
1114 if (intWidth < 1) {
1115 intWidth = 1;
1116 }
1117 itemPtr->x1 -= intWidth;
1118 itemPtr->y1 -= intWidth;
1119 itemPtr->x2 += intWidth;
1120 itemPtr->y2 += intWidth;
1121 Tk_CanvasEventuallyRedraw(canvas, itemPtr->x1, itemPtr->y1,
1122 itemPtr->x2, itemPtr->y2);
1123 }
1124
1125 ComputeLineBbox(canvas, linePtr);
1126 }
1127
1128 /*
1129 *--------------------------------------------------------------
1130 *
1131 * LineDeleteCoords --
1132 *
1133 * Delete one or more coordinates from a line item.
1134 *
1135 * Results:
1136 * None.
1137 *
1138 * Side effects:
1139 * Characters between "first" and "last", inclusive, get deleted from
1140 * itemPtr.
1141 *
1142 *--------------------------------------------------------------
1143 */
1144
1145 static void
LineDeleteCoords(Tk_Canvas canvas,Tk_Item * itemPtr,int first,int last)1146 LineDeleteCoords(
1147 Tk_Canvas canvas, /* Canvas containing itemPtr. */
1148 Tk_Item *itemPtr, /* Item in which to delete characters. */
1149 int first, /* Index of first character to delete. */
1150 int last) /* Index of last character to delete. */
1151 {
1152 LineItem *linePtr = (LineItem *) itemPtr;
1153 int count, i, first1, last1;
1154 int length = 2*linePtr->numPoints;
1155 double *coordPtr;
1156 Tk_State state = itemPtr->state;
1157
1158 if (state == TK_STATE_NULL) {
1159 state = Canvas(canvas)->canvas_state;
1160 }
1161
1162 first &= -2;
1163 last &= -2;
1164
1165 if (first < 0) {
1166 first = 0;
1167 }
1168 if (last >= length) {
1169 last = length-2;
1170 }
1171 if (first > last) {
1172 return;
1173 }
1174 if (linePtr->firstArrowPtr != NULL) {
1175 linePtr->coordPtr[0] = linePtr->firstArrowPtr[0];
1176 linePtr->coordPtr[1] = linePtr->firstArrowPtr[1];
1177 }
1178 if (linePtr->lastArrowPtr != NULL) {
1179 linePtr->coordPtr[length-2] = linePtr->lastArrowPtr[0];
1180 linePtr->coordPtr[length-1] = linePtr->lastArrowPtr[1];
1181 }
1182 first1 = first;
1183 last1 = last;
1184 if (first1 > 0) {
1185 first1 -= 2;
1186 }
1187 if (last1 < length-2) {
1188 last1 += 2;
1189 }
1190 if (linePtr->smooth) {
1191 if (first1 > 0) {
1192 first1 -= 2;
1193 }
1194 if (last1 < length-2) {
1195 last1 += 2;
1196 }
1197 }
1198
1199 if ((first1 >= 2) || (last1 < length-2)) {
1200 /*
1201 * This is some optimizing code that will result that only the part of
1202 * the line that changed (and the objects that are overlapping with
1203 * that part) need to be redrawn. A special flag is set that instructs
1204 * the general canvas code not to redraw the whole object. If this
1205 * flag is set, the redrawing has to be done here, otherwise the
1206 * general Canvas code will take care of it.
1207 */
1208
1209 itemPtr->redraw_flags |= TK_ITEM_DONT_REDRAW;
1210 itemPtr->x1 = itemPtr->x2 = (int) linePtr->coordPtr[first1];
1211 itemPtr->y1 = itemPtr->y2 = (int) linePtr->coordPtr[first1+1];
1212 if ((linePtr->firstArrowPtr != NULL) && (first1 < 2)) {
1213 /*
1214 * Include old first arrow.
1215 */
1216
1217 for (i = 0, coordPtr = linePtr->firstArrowPtr; i < PTS_IN_ARROW;
1218 i++, coordPtr += 2) {
1219 TkIncludePoint(itemPtr, coordPtr);
1220 }
1221 }
1222 if ((linePtr->lastArrowPtr != NULL) && (last1 >= length-2)) {
1223 /*
1224 * Include old last arrow.
1225 */
1226
1227 for (i = 0, coordPtr = linePtr->lastArrowPtr; i < PTS_IN_ARROW;
1228 i++, coordPtr += 2) {
1229 TkIncludePoint(itemPtr, coordPtr);
1230 }
1231 }
1232 coordPtr = linePtr->coordPtr+first1+2;
1233 for (i=first1+2; i<=last1; i+=2) {
1234 TkIncludePoint(itemPtr, coordPtr);
1235 coordPtr += 2;
1236 }
1237 }
1238
1239 count = last + 2 - first;
1240 for (i=last+2; i<length; i++) {
1241 linePtr->coordPtr[i-count] = linePtr->coordPtr[i];
1242 }
1243 linePtr->numPoints -= count/2;
1244 if (linePtr->firstArrowPtr != NULL) {
1245 ckfree(linePtr->firstArrowPtr);
1246 linePtr->firstArrowPtr = NULL;
1247 }
1248 if (linePtr->lastArrowPtr != NULL) {
1249 ckfree(linePtr->lastArrowPtr);
1250 linePtr->lastArrowPtr = NULL;
1251 }
1252 if (linePtr->arrow != ARROWS_NONE) {
1253 ConfigureArrows(canvas, linePtr);
1254 }
1255 if (itemPtr->redraw_flags & TK_ITEM_DONT_REDRAW) {
1256 double width;
1257 int intWidth;
1258
1259 if ((linePtr->firstArrowPtr != NULL) && (first1 < 4)) {
1260 /*
1261 * Include new first arrow.
1262 */
1263
1264 for (i = 0, coordPtr = linePtr->firstArrowPtr; i < PTS_IN_ARROW;
1265 i++, coordPtr += 2) {
1266 TkIncludePoint(itemPtr, coordPtr);
1267 }
1268 }
1269 if ((linePtr->lastArrowPtr != NULL) && (last1 > length-4)) {
1270 /*
1271 * Include new right arrow.
1272 */
1273
1274 for (i = 0, coordPtr = linePtr->lastArrowPtr; i < PTS_IN_ARROW;
1275 i++, coordPtr += 2) {
1276 TkIncludePoint(itemPtr, coordPtr);
1277 }
1278 }
1279 width = linePtr->outline.width;
1280 if (Canvas(canvas)->currentItemPtr == itemPtr) {
1281 if (linePtr->outline.activeWidth > width) {
1282 width = linePtr->outline.activeWidth;
1283 }
1284 } else if (state == TK_STATE_DISABLED) {
1285 if (linePtr->outline.disabledWidth > 0) {
1286 width = linePtr->outline.disabledWidth;
1287 }
1288 }
1289 intWidth = (int) (width + 0.5);
1290 if (intWidth < 1) {
1291 intWidth = 1;
1292 }
1293 itemPtr->x1 -= intWidth;
1294 itemPtr->y1 -= intWidth;
1295 itemPtr->x2 += intWidth;
1296 itemPtr->y2 += intWidth;
1297 Tk_CanvasEventuallyRedraw(canvas, itemPtr->x1, itemPtr->y1,
1298 itemPtr->x2, itemPtr->y2);
1299 }
1300 ComputeLineBbox(canvas, linePtr);
1301 }
1302
1303 /*
1304 *--------------------------------------------------------------
1305 *
1306 * LineToPoint --
1307 *
1308 * Computes the distance from a given point to a given line, in canvas
1309 * units.
1310 *
1311 * Results:
1312 * The return value is 0 if the point whose x and y coordinates are
1313 * pointPtr[0] and pointPtr[1] is inside the line. If the point isn't
1314 * inside the line then the return value is the distance from the point
1315 * to the line.
1316 *
1317 * Side effects:
1318 * None.
1319 *
1320 *--------------------------------------------------------------
1321 */
1322
1323 static double
LineToPoint(Tk_Canvas canvas,Tk_Item * itemPtr,double * pointPtr)1324 LineToPoint(
1325 Tk_Canvas canvas, /* Canvas containing item. */
1326 Tk_Item *itemPtr, /* Item to check against point. */
1327 double *pointPtr) /* Pointer to x and y coordinates. */
1328 {
1329 Tk_State state = itemPtr->state;
1330 LineItem *linePtr = (LineItem *) itemPtr;
1331 double *coordPtr, *linePoints;
1332 double staticSpace[2*MAX_STATIC_POINTS];
1333 double poly[10];
1334 double bestDist, dist, width;
1335 int numPoints, count;
1336 int changedMiterToBevel; /* Non-zero means that a mitered corner had to
1337 * be treated as beveled after all because the
1338 * angle was < 11 degrees. */
1339
1340 bestDist = 1.0e36;
1341
1342 /*
1343 * Handle smoothed lines by generating an expanded set of points against
1344 * which to do the check.
1345 */
1346
1347 if (state == TK_STATE_NULL) {
1348 state = Canvas(canvas)->canvas_state;
1349 }
1350
1351 width = linePtr->outline.width;
1352 if (Canvas(canvas)->currentItemPtr == itemPtr) {
1353 if (linePtr->outline.activeWidth > width) {
1354 width = linePtr->outline.activeWidth;
1355 }
1356 } else if (state == TK_STATE_DISABLED) {
1357 if (linePtr->outline.disabledWidth > 0) {
1358 width = linePtr->outline.disabledWidth;
1359 }
1360 }
1361
1362 if ((linePtr->smooth) && (linePtr->numPoints > 2)) {
1363 numPoints = linePtr->smooth->coordProc(canvas, NULL,
1364 linePtr->numPoints, linePtr->splineSteps, NULL, NULL);
1365 if (numPoints <= MAX_STATIC_POINTS) {
1366 linePoints = staticSpace;
1367 } else {
1368 linePoints = (double *)ckalloc(2 * numPoints * sizeof(double));
1369 }
1370 numPoints = linePtr->smooth->coordProc(canvas, linePtr->coordPtr,
1371 linePtr->numPoints, linePtr->splineSteps, NULL, linePoints);
1372 } else {
1373 numPoints = linePtr->numPoints;
1374 linePoints = linePtr->coordPtr;
1375 }
1376
1377 if (width < 1.0) {
1378 width = 1.0;
1379 }
1380
1381 if (!numPoints || itemPtr->state == TK_STATE_HIDDEN) {
1382 return bestDist;
1383 } else if (numPoints == 1) {
1384 bestDist = hypot(linePoints[0]-pointPtr[0], linePoints[1]-pointPtr[1])
1385 - width/2.0;
1386 if (bestDist < 0) {
1387 bestDist = 0;
1388 }
1389 return bestDist;
1390 }
1391
1392 /*
1393 * The overall idea is to iterate through all of the edges of the line,
1394 * computing a polygon for each edge and testing the point against that
1395 * polygon. In addition, there are additional tests to deal with rounded
1396 * joints and caps.
1397 */
1398
1399 changedMiterToBevel = 0;
1400 for (count = numPoints, coordPtr = linePoints; count >= 2;
1401 count--, coordPtr += 2) {
1402 /*
1403 * If rounding is done around the first point then compute the
1404 * distance between the point and the point.
1405 */
1406
1407 if (((linePtr->capStyle == CapRound) && (count == numPoints))
1408 || ((linePtr->joinStyle == JoinRound)
1409 && (count != numPoints))) {
1410 dist = hypot(coordPtr[0] - pointPtr[0], coordPtr[1] - pointPtr[1])
1411 - width/2.0;
1412 if (dist <= 0.0) {
1413 bestDist = 0.0;
1414 goto done;
1415 } else if (dist < bestDist) {
1416 bestDist = dist;
1417 }
1418 }
1419
1420 /*
1421 * Compute the polygonal shape corresponding to this edge, consisting
1422 * of two points for the first point of the edge and two points for
1423 * the last point of the edge.
1424 */
1425
1426 if (count == numPoints) {
1427 TkGetButtPoints(coordPtr+2, coordPtr, width,
1428 linePtr->capStyle == CapProjecting, poly, poly+2);
1429 } else if ((linePtr->joinStyle == JoinMiter) && !changedMiterToBevel) {
1430 poly[0] = poly[6];
1431 poly[1] = poly[7];
1432 poly[2] = poly[4];
1433 poly[3] = poly[5];
1434 } else {
1435 TkGetButtPoints(coordPtr+2, coordPtr, width, 0, poly, poly+2);
1436
1437 /*
1438 * If this line uses beveled joints, then check the distance to a
1439 * polygon comprising the last two points of the previous polygon
1440 * and the first two from this polygon; this checks the wedges
1441 * that fill the mitered joint.
1442 */
1443
1444 if ((linePtr->joinStyle == JoinBevel) || changedMiterToBevel) {
1445 poly[8] = poly[0];
1446 poly[9] = poly[1];
1447 dist = TkPolygonToPoint(poly, 5, pointPtr);
1448 if (dist <= 0.0) {
1449 bestDist = 0.0;
1450 goto done;
1451 } else if (dist < bestDist) {
1452 bestDist = dist;
1453 }
1454 changedMiterToBevel = 0;
1455 }
1456 }
1457 if (count == 2) {
1458 TkGetButtPoints(coordPtr, coordPtr+2, width,
1459 linePtr->capStyle == CapProjecting, poly+4, poly+6);
1460 } else if (linePtr->joinStyle == JoinMiter) {
1461 if (TkGetMiterPoints(coordPtr, coordPtr+2, coordPtr+4,
1462 width, poly+4, poly+6) == 0) {
1463 changedMiterToBevel = 1;
1464 TkGetButtPoints(coordPtr, coordPtr+2, width, 0,
1465 poly+4, poly+6);
1466 }
1467 } else {
1468 TkGetButtPoints(coordPtr, coordPtr+2, width, 0,
1469 poly+4, poly+6);
1470 }
1471 poly[8] = poly[0];
1472 poly[9] = poly[1];
1473 dist = TkPolygonToPoint(poly, 5, pointPtr);
1474 if (dist <= 0.0) {
1475 bestDist = 0.0;
1476 goto done;
1477 } else if (dist < bestDist) {
1478 bestDist = dist;
1479 }
1480 }
1481
1482 /*
1483 * If caps are rounded, check the distance to the cap around the final end
1484 * point of the line.
1485 */
1486
1487 if (linePtr->capStyle == CapRound) {
1488 dist = hypot(coordPtr[0] - pointPtr[0], coordPtr[1] - pointPtr[1])
1489 - width/2.0;
1490 if (dist <= 0.0) {
1491 bestDist = 0.0;
1492 goto done;
1493 } else if (dist < bestDist) {
1494 bestDist = dist;
1495 }
1496 }
1497
1498 /*
1499 * If there are arrowheads, check the distance to the arrowheads.
1500 */
1501
1502 if (linePtr->arrow != ARROWS_NONE) {
1503 if (linePtr->arrow != ARROWS_LAST) {
1504 dist = TkPolygonToPoint(linePtr->firstArrowPtr, PTS_IN_ARROW,
1505 pointPtr);
1506 if (dist <= 0.0) {
1507 bestDist = 0.0;
1508 goto done;
1509 } else if (dist < bestDist) {
1510 bestDist = dist;
1511 }
1512 }
1513 if (linePtr->arrow != ARROWS_FIRST) {
1514 dist = TkPolygonToPoint(linePtr->lastArrowPtr, PTS_IN_ARROW,
1515 pointPtr);
1516 if (dist <= 0.0) {
1517 bestDist = 0.0;
1518 goto done;
1519 } else if (dist < bestDist) {
1520 bestDist = dist;
1521 }
1522 }
1523 }
1524
1525 done:
1526 if ((linePoints != staticSpace) && (linePoints != linePtr->coordPtr)) {
1527 ckfree(linePoints);
1528 }
1529 return bestDist;
1530 }
1531
1532 /*
1533 *--------------------------------------------------------------
1534 *
1535 * LineToArea --
1536 *
1537 * This function is called to determine whether an item lies entirely
1538 * inside, entirely outside, or overlapping a given rectangular area.
1539 *
1540 * Results:
1541 * -1 is returned if the item is entirely outside the area, 0 if it
1542 * overlaps, and 1 if it is entirely inside the given area.
1543 *
1544 * Side effects:
1545 * None.
1546 *
1547 *--------------------------------------------------------------
1548 */
1549
1550 static int
LineToArea(Tk_Canvas canvas,Tk_Item * itemPtr,double * rectPtr)1551 LineToArea(
1552 Tk_Canvas canvas, /* Canvas containing item. */
1553 Tk_Item *itemPtr, /* Item to check against line. */
1554 double *rectPtr)
1555 {
1556 LineItem *linePtr = (LineItem *) itemPtr;
1557 double staticSpace[2*MAX_STATIC_POINTS];
1558 double *linePoints;
1559 int numPoints, result;
1560 double radius, width;
1561 Tk_State state = itemPtr->state;
1562
1563 if (state == TK_STATE_NULL) {
1564 state = Canvas(canvas)->canvas_state;
1565 }
1566 width = linePtr->outline.width;
1567 if (Canvas(canvas)->currentItemPtr == itemPtr) {
1568 if (linePtr->outline.activeWidth > width) {
1569 width = linePtr->outline.activeWidth;
1570 }
1571 } else if (state == TK_STATE_DISABLED) {
1572 if (linePtr->outline.disabledWidth > 0) {
1573 width = linePtr->outline.disabledWidth;
1574 }
1575 }
1576
1577 radius = (width+1.0)/2.0;
1578
1579 if ((state == TK_STATE_HIDDEN) || !linePtr->numPoints) {
1580 return -1;
1581 } else if (linePtr->numPoints == 1) {
1582 double oval[4];
1583
1584 oval[0] = linePtr->coordPtr[0]-radius;
1585 oval[1] = linePtr->coordPtr[1]-radius;
1586 oval[2] = linePtr->coordPtr[0]+radius;
1587 oval[3] = linePtr->coordPtr[1]+radius;
1588 return TkOvalToArea(oval, rectPtr);
1589 }
1590
1591 /*
1592 * Handle smoothed lines by generating an expanded set of points against
1593 * which to do the check.
1594 */
1595
1596 if ((linePtr->smooth) && (linePtr->numPoints > 2)) {
1597 numPoints = linePtr->smooth->coordProc(canvas, NULL,
1598 linePtr->numPoints, linePtr->splineSteps, NULL, NULL);
1599 if (numPoints <= MAX_STATIC_POINTS) {
1600 linePoints = staticSpace;
1601 } else {
1602 linePoints = (double *)ckalloc(2 * numPoints * sizeof(double));
1603 }
1604 numPoints = linePtr->smooth->coordProc(canvas, linePtr->coordPtr,
1605 linePtr->numPoints, linePtr->splineSteps, NULL, linePoints);
1606 } else {
1607 numPoints = linePtr->numPoints;
1608 linePoints = linePtr->coordPtr;
1609 }
1610
1611 /*
1612 * Check the segments of the line.
1613 */
1614
1615 if (width < 1.0) {
1616 width = 1.0;
1617 }
1618
1619 result = TkThickPolyLineToArea(linePoints, numPoints, width,
1620 linePtr->capStyle, linePtr->joinStyle, rectPtr);
1621 if (result == 0) {
1622 goto done;
1623 }
1624
1625 /*
1626 * Check arrowheads, if any.
1627 */
1628
1629 if (linePtr->arrow != ARROWS_NONE) {
1630 if (linePtr->arrow != ARROWS_LAST) {
1631 if (TkPolygonToArea(linePtr->firstArrowPtr, PTS_IN_ARROW,
1632 rectPtr) != result) {
1633 result = 0;
1634 goto done;
1635 }
1636 }
1637 if (linePtr->arrow != ARROWS_FIRST) {
1638 if (TkPolygonToArea(linePtr->lastArrowPtr, PTS_IN_ARROW,
1639 rectPtr) != result) {
1640 result = 0;
1641 goto done;
1642 }
1643 }
1644 }
1645
1646 done:
1647 if ((linePoints != staticSpace) && (linePoints != linePtr->coordPtr)) {
1648 ckfree(linePoints);
1649 }
1650 return result;
1651 }
1652
1653 /*
1654 *--------------------------------------------------------------
1655 *
1656 * ScaleLine --
1657 *
1658 * This function is invoked to rescale a line item.
1659 *
1660 * Results:
1661 * None.
1662 *
1663 * Side effects:
1664 * The line referred to by itemPtr is rescaled so that the following
1665 * transformation is applied to all point coordinates:
1666 * x' = originX + scaleX*(x-originX)
1667 * y' = originY + scaleY*(y-originY)
1668 *
1669 *--------------------------------------------------------------
1670 */
1671
1672 static void
ScaleLine(Tk_Canvas canvas,Tk_Item * itemPtr,double originX,double originY,double scaleX,double scaleY)1673 ScaleLine(
1674 Tk_Canvas canvas, /* Canvas containing line. */
1675 Tk_Item *itemPtr, /* Line to be scaled. */
1676 double originX, double originY,
1677 /* Origin about which to scale rect. */
1678 double scaleX, /* Amount to scale in X direction. */
1679 double scaleY) /* Amount to scale in Y direction. */
1680 {
1681 LineItem *linePtr = (LineItem *) itemPtr;
1682 double *coordPtr;
1683 int i;
1684
1685 /*
1686 * Delete any arrowheads before scaling all the points (so that the
1687 * end-points of the line get restored).
1688 */
1689
1690 if (linePtr->firstArrowPtr != NULL) {
1691 linePtr->coordPtr[0] = linePtr->firstArrowPtr[0];
1692 linePtr->coordPtr[1] = linePtr->firstArrowPtr[1];
1693 ckfree(linePtr->firstArrowPtr);
1694 linePtr->firstArrowPtr = NULL;
1695 }
1696 if (linePtr->lastArrowPtr != NULL) {
1697 i = 2*(linePtr->numPoints-1);
1698 linePtr->coordPtr[i] = linePtr->lastArrowPtr[0];
1699 linePtr->coordPtr[i+1] = linePtr->lastArrowPtr[1];
1700 ckfree(linePtr->lastArrowPtr);
1701 linePtr->lastArrowPtr = NULL;
1702 }
1703 for (i = 0, coordPtr = linePtr->coordPtr; i < linePtr->numPoints;
1704 i++, coordPtr += 2) {
1705 coordPtr[0] = originX + scaleX*(*coordPtr - originX);
1706 coordPtr[1] = originY + scaleY*(coordPtr[1] - originY);
1707 }
1708 if (linePtr->arrow != ARROWS_NONE) {
1709 ConfigureArrows(canvas, linePtr);
1710 }
1711 ComputeLineBbox(canvas, linePtr);
1712 }
1713
1714 /*
1715 *--------------------------------------------------------------
1716 *
1717 * GetLineIndex --
1718 *
1719 * Parse an index into a line item and return either its value or an
1720 * error.
1721 *
1722 * Results:
1723 * A standard Tcl result. If all went well, then *indexPtr is filled in
1724 * with the index (into itemPtr) corresponding to string. Otherwise an
1725 * error message is left in interp->result.
1726 *
1727 * Side effects:
1728 * None.
1729 *
1730 *--------------------------------------------------------------
1731 */
1732
1733 static int
GetLineIndex(Tcl_Interp * interp,Tk_Canvas canvas,Tk_Item * itemPtr,Tcl_Obj * obj,int * indexPtr)1734 GetLineIndex(
1735 Tcl_Interp *interp, /* Used for error reporting. */
1736 Tk_Canvas canvas, /* Canvas containing item. */
1737 Tk_Item *itemPtr, /* Item for which the index is being
1738 * specified. */
1739 Tcl_Obj *obj, /* Specification of a particular coord in
1740 * itemPtr's line. */
1741 int *indexPtr) /* Where to store converted index. */
1742 {
1743 LineItem *linePtr = (LineItem *) itemPtr;
1744 const char *string = Tcl_GetString(obj);
1745
1746 if (string[0] == 'e') {
1747 if (strncmp(string, "end", obj->length) == 0) {
1748 *indexPtr = 2*linePtr->numPoints;
1749 } else {
1750 goto badIndex;
1751 }
1752 } else if (string[0] == '@') {
1753 int i;
1754 double x, y, bestDist, dist, *coordPtr;
1755 char *end;
1756 const char *p;
1757
1758 p = string+1;
1759 x = strtod(p, &end);
1760 if ((end == p) || (*end != ',')) {
1761 goto badIndex;
1762 }
1763 p = end+1;
1764 y = strtod(p, &end);
1765 if ((end == p) || (*end != 0)) {
1766 goto badIndex;
1767 }
1768 bestDist = 1.0e36;
1769 coordPtr = linePtr->coordPtr;
1770 *indexPtr = 0;
1771 for (i=0; i<linePtr->numPoints; i++) {
1772 dist = hypot(coordPtr[0] - x, coordPtr[1] - y);
1773 if (dist < bestDist) {
1774 bestDist = dist;
1775 *indexPtr = 2*i;
1776 }
1777 coordPtr += 2;
1778 }
1779 } else {
1780 if (Tcl_GetIntFromObj(interp, obj, indexPtr) != TCL_OK) {
1781 goto badIndex;
1782 }
1783 *indexPtr &= -2; /* If index is odd, make it even. */
1784 if (*indexPtr < 0){
1785 *indexPtr = 0;
1786 } else if (*indexPtr > (2*linePtr->numPoints)) {
1787 *indexPtr = (2*linePtr->numPoints);
1788 }
1789 }
1790 return TCL_OK;
1791
1792 /*
1793 * Some of the paths here leave messages in interp->result, so we have to
1794 * clear it out before storing our own message.
1795 */
1796
1797 badIndex:
1798 Tcl_ResetResult(interp);
1799 Tcl_SetObjResult(interp, Tcl_ObjPrintf("bad index \"%s\"", string));
1800 Tcl_SetErrorCode(interp, "TK", "CANVAS", "ITEM_INDEX", "LINE", NULL);
1801 return TCL_ERROR;
1802 }
1803
1804 /*
1805 *--------------------------------------------------------------
1806 *
1807 * TranslateLine --
1808 *
1809 * This function is called to move a line by a given amount.
1810 *
1811 * Results:
1812 * None.
1813 *
1814 * Side effects:
1815 * The position of the line is offset by (xDelta, yDelta), and the
1816 * bounding box is updated in the generic part of the item structure.
1817 *
1818 *--------------------------------------------------------------
1819 */
1820
1821 static void
TranslateLine(Tk_Canvas canvas,Tk_Item * itemPtr,double deltaX,double deltaY)1822 TranslateLine(
1823 Tk_Canvas canvas, /* Canvas containing item. */
1824 Tk_Item *itemPtr, /* Item that is being moved. */
1825 double deltaX, double deltaY)
1826 /* Amount by which item is to be moved. */
1827 {
1828 LineItem *linePtr = (LineItem *) itemPtr;
1829 double *coordPtr;
1830 int i;
1831
1832 for (i = 0, coordPtr = linePtr->coordPtr; i < linePtr->numPoints;
1833 i++, coordPtr += 2) {
1834 coordPtr[0] += deltaX;
1835 coordPtr[1] += deltaY;
1836 }
1837 if (linePtr->firstArrowPtr != NULL) {
1838 for (i = 0, coordPtr = linePtr->firstArrowPtr; i < PTS_IN_ARROW;
1839 i++, coordPtr += 2) {
1840 coordPtr[0] += deltaX;
1841 coordPtr[1] += deltaY;
1842 }
1843 }
1844 if (linePtr->lastArrowPtr != NULL) {
1845 for (i = 0, coordPtr = linePtr->lastArrowPtr; i < PTS_IN_ARROW;
1846 i++, coordPtr += 2) {
1847 coordPtr[0] += deltaX;
1848 coordPtr[1] += deltaY;
1849 }
1850 }
1851 ComputeLineBbox(canvas, linePtr);
1852 }
1853
1854 /*
1855 *--------------------------------------------------------------
1856 *
1857 * ParseArrowShape --
1858 *
1859 * This function is called back during option parsing to parse arrow
1860 * shape information.
1861 *
1862 * Results:
1863 * The return value is a standard Tcl result: TCL_OK means that the arrow
1864 * shape information was parsed ok, and TCL_ERROR means it couldn't be
1865 * parsed.
1866 *
1867 * Side effects:
1868 * Arrow information in recordPtr is updated.
1869 *
1870 *--------------------------------------------------------------
1871 */
1872
1873 static int
ParseArrowShape(TCL_UNUSED (void *),Tcl_Interp * interp,TCL_UNUSED (Tk_Window),const char * value,char * recordPtr,int offset)1874 ParseArrowShape(
1875 TCL_UNUSED(void *), /* Not used. */
1876 Tcl_Interp *interp, /* Used for error reporting. */
1877 TCL_UNUSED(Tk_Window), /* Not used. */
1878 const char *value, /* Textual specification of arrow shape. */
1879 char *recordPtr, /* Pointer to item record in which to store
1880 * arrow information. */
1881 int offset) /* Offset of shape information in widget
1882 * record. */
1883 {
1884 LineItem *linePtr = (LineItem *) recordPtr;
1885 double a, b, c;
1886 int argc;
1887 const char **argv = NULL;
1888
1889 if (offset != Tk_Offset(LineItem, arrowShapeA)) {
1890 Tcl_Panic("ParseArrowShape received bogus offset");
1891 }
1892
1893 if (Tcl_SplitList(interp, (char *) value, &argc, &argv) != TCL_OK) {
1894 goto syntaxError;
1895 } else if (argc != 3) {
1896 goto syntaxError;
1897 }
1898 if ((Tk_CanvasGetCoord(interp, linePtr->canvas, argv[0], &a) != TCL_OK)
1899 || (Tk_CanvasGetCoord(interp, linePtr->canvas, argv[1], &b)
1900 != TCL_OK)
1901 || (Tk_CanvasGetCoord(interp, linePtr->canvas, argv[2], &c)
1902 != TCL_OK)) {
1903 goto syntaxError;
1904 }
1905
1906 linePtr->arrowShapeA = (float) a;
1907 linePtr->arrowShapeB = (float) b;
1908 linePtr->arrowShapeC = (float) c;
1909 ckfree(argv);
1910 return TCL_OK;
1911
1912 syntaxError:
1913 Tcl_ResetResult(interp);
1914 Tcl_SetObjResult(interp, Tcl_ObjPrintf(
1915 "bad arrow shape \"%s\": must be list with three numbers",
1916 value));
1917 Tcl_SetErrorCode(interp, "TK", "CANVAS", "ARROW_SHAPE", NULL);
1918 if (argv != NULL) {
1919 ckfree(argv);
1920 }
1921 return TCL_ERROR;
1922 }
1923
1924 /*
1925 *--------------------------------------------------------------
1926 *
1927 * PrintArrowShape --
1928 *
1929 * This function is a callback invoked by the configuration code to
1930 * return a printable value describing an arrow shape.
1931 *
1932 * Results:
1933 * None.
1934 *
1935 * Side effects:
1936 * None.
1937 *
1938 *--------------------------------------------------------------
1939 */
1940
1941 static const char *
PrintArrowShape(TCL_UNUSED (void *),TCL_UNUSED (Tk_Window),char * recordPtr,TCL_UNUSED (int),Tcl_FreeProc ** freeProcPtr)1942 PrintArrowShape(
1943 TCL_UNUSED(void *), /* Not used. */
1944 TCL_UNUSED(Tk_Window), /* Window associated with linePtr's widget. */
1945 char *recordPtr, /* Pointer to item record containing current
1946 * shape information. */
1947 TCL_UNUSED(int), /* Offset of arrow information in record. */
1948 Tcl_FreeProc **freeProcPtr) /* Store address of function to call to free
1949 * string here. */
1950 {
1951 LineItem *linePtr = (LineItem *) recordPtr;
1952 char *buffer = (char *)ckalloc(120);
1953
1954 sprintf(buffer, "%.5g %.5g %.5g", linePtr->arrowShapeA,
1955 linePtr->arrowShapeB, linePtr->arrowShapeC);
1956 *freeProcPtr = TCL_DYNAMIC;
1957 return buffer;
1958 }
1959
1960 /*
1961 *--------------------------------------------------------------
1962 *
1963 * ArrowParseProc --
1964 *
1965 * This function is invoked during option processing to handle the
1966 * "-arrow" option.
1967 *
1968 * Results:
1969 * A standard Tcl return value.
1970 *
1971 * Side effects:
1972 * The arrow for a given item gets replaced by the arrow indicated in the
1973 * value argument.
1974 *
1975 *--------------------------------------------------------------
1976 */
1977
1978 static int
ArrowParseProc(TCL_UNUSED (void *),Tcl_Interp * interp,TCL_UNUSED (Tk_Window),const char * value,char * widgRec,int offset)1979 ArrowParseProc(
1980 TCL_UNUSED(void *),
1981 Tcl_Interp *interp, /* Used for reporting errors. */
1982 TCL_UNUSED(Tk_Window), /* Window containing canvas widget. */
1983 const char *value, /* Value of option. */
1984 char *widgRec, /* Pointer to record for item. */
1985 int offset) /* Offset into item. */
1986 {
1987 int c;
1988 size_t length;
1989 Arrows *arrowPtr = (Arrows *) (widgRec + offset);
1990
1991 if (value == NULL || *value == 0) {
1992 *arrowPtr = ARROWS_NONE;
1993 return TCL_OK;
1994 }
1995
1996 c = value[0];
1997 length = strlen(value);
1998
1999 if ((c == 'n') && (strncmp(value, "none", length) == 0)) {
2000 *arrowPtr = ARROWS_NONE;
2001 return TCL_OK;
2002 }
2003 if ((c == 'f') && (strncmp(value, "first", length) == 0)) {
2004 *arrowPtr = ARROWS_FIRST;
2005 return TCL_OK;
2006 }
2007 if ((c == 'l') && (strncmp(value, "last", length) == 0)) {
2008 *arrowPtr = ARROWS_LAST;
2009 return TCL_OK;
2010 }
2011 if ((c == 'b') && (strncmp(value, "both", length) == 0)) {
2012 *arrowPtr = ARROWS_BOTH;
2013 return TCL_OK;
2014 }
2015
2016 Tcl_SetObjResult(interp, Tcl_ObjPrintf(
2017 "bad arrow spec \"%s\": must be none, first, last, or both",
2018 value));
2019 Tcl_SetErrorCode(interp, "TK", "CANVAS", "ARROW", NULL);
2020 *arrowPtr = ARROWS_NONE;
2021 return TCL_ERROR;
2022 }
2023
2024 /*
2025 *--------------------------------------------------------------
2026 *
2027 * ArrowPrintProc --
2028 *
2029 * This function is invoked by the Tk configuration code to produce a
2030 * printable string for the "-arrow" configuration option.
2031 *
2032 * Results:
2033 * The return value is a string describing the arrows for the item
2034 * referred to by "widgRec". In addition, *freeProcPtr is filled in with
2035 * the address of a function to call to free the result string when it's
2036 * no longer needed (or NULL to indicate that the string doesn't need to
2037 * be freed).
2038 *
2039 * Side effects:
2040 * None.
2041 *
2042 *--------------------------------------------------------------
2043 */
2044
2045 static const char *
ArrowPrintProc(TCL_UNUSED (void *),TCL_UNUSED (Tk_Window),char * widgRec,int offset,TCL_UNUSED (Tcl_FreeProc **))2046 ArrowPrintProc(
2047 TCL_UNUSED(void *), /* Ignored. */
2048 TCL_UNUSED(Tk_Window), /* Window containing canvas widget. */
2049 char *widgRec, /* Pointer to record for item. */
2050 int offset, /* Offset into item. */
2051 TCL_UNUSED(Tcl_FreeProc **)) /* Pointer to variable to fill in with
2052 * information about how to reclaim storage
2053 * for return string. */
2054 {
2055 Arrows *arrowPtr = (Arrows *) (widgRec + offset);
2056
2057 switch (*arrowPtr) {
2058 case ARROWS_FIRST:
2059 return "first";
2060 case ARROWS_LAST:
2061 return "last";
2062 case ARROWS_BOTH:
2063 return "both";
2064 default:
2065 return "none";
2066 }
2067 }
2068
2069 /*
2070 *--------------------------------------------------------------
2071 *
2072 * ConfigureArrows --
2073 *
2074 * If arrowheads have been requested for a line, this function makes
2075 * arrangements for the arrowheads.
2076 *
2077 * Results:
2078 * Always returns TCL_OK.
2079 *
2080 * Side effects:
2081 * Information in linePtr is set up for one or two arrowheads. The
2082 * firstArrowPtr and lastArrowPtr polygons are allocated and initialized,
2083 * if need be, and the end points of the line are adjusted so that a
2084 * thick line doesn't stick out past the arrowheads.
2085 *
2086 *--------------------------------------------------------------
2087 */
2088
2089 static int
ConfigureArrows(Tk_Canvas canvas,LineItem * linePtr)2090 ConfigureArrows(
2091 Tk_Canvas canvas, /* Canvas in which arrows will be displayed
2092 * (interp and tkwin fields are needed). */
2093 LineItem *linePtr) /* Item to configure for arrows. */
2094 {
2095 double *poly, *coordPtr;
2096 double dx, dy, length, sinTheta, cosTheta, temp;
2097 double fracHeight; /* Line width as fraction of arrowhead
2098 * width. */
2099 double backup; /* Distance to backup end points so the line
2100 * ends in the middle of the arrowhead. */
2101 double vertX, vertY; /* Position of arrowhead vertex. */
2102 double shapeA, shapeB, shapeC;
2103 /* Adjusted coordinates (see explanation
2104 * below). */
2105 double width;
2106 Tk_State state = linePtr->header.state;
2107
2108 if (linePtr->numPoints < 2) {
2109 return TCL_OK;
2110 }
2111
2112 if (state == TK_STATE_NULL) {
2113 state = Canvas(canvas)->canvas_state;
2114 }
2115
2116 width = linePtr->outline.width;
2117 if (Canvas(canvas)->currentItemPtr == (Tk_Item *)linePtr) {
2118 if (linePtr->outline.activeWidth > width) {
2119 width = linePtr->outline.activeWidth;
2120 }
2121 } else if (state == TK_STATE_DISABLED) {
2122 if (linePtr->outline.disabledWidth > 0) {
2123 width = linePtr->outline.disabledWidth;
2124 }
2125 }
2126
2127 /*
2128 * The code below makes a tiny increase in the shape parameters for the
2129 * line. This is a bit of a hack, but it seems to result in displays that
2130 * more closely approximate the specified parameters. Without the
2131 * adjustment, the arrows come out smaller than expected.
2132 */
2133
2134 shapeA = linePtr->arrowShapeA + 0.001;
2135 shapeB = linePtr->arrowShapeB + 0.001;
2136 shapeC = linePtr->arrowShapeC + width/2.0 + 0.001;
2137
2138 /*
2139 * If there's an arrowhead on the first point of the line, compute its
2140 * polygon and adjust the first point of the line so that the line doesn't
2141 * stick out past the leading edge of the arrowhead.
2142 */
2143
2144 fracHeight = (width/2.0)/shapeC;
2145 backup = fracHeight*shapeB + shapeA*(1.0 - fracHeight)/2.0;
2146 if (linePtr->arrow != ARROWS_LAST) {
2147 poly = linePtr->firstArrowPtr;
2148 if (poly == NULL) {
2149 poly = (double *)ckalloc(2 * PTS_IN_ARROW * sizeof(double));
2150 poly[0] = poly[10] = linePtr->coordPtr[0];
2151 poly[1] = poly[11] = linePtr->coordPtr[1];
2152 linePtr->firstArrowPtr = poly;
2153 }
2154 dx = poly[0] - linePtr->coordPtr[2];
2155 dy = poly[1] - linePtr->coordPtr[3];
2156 length = hypot(dx, dy);
2157 if (length == 0) {
2158 sinTheta = cosTheta = 0.0;
2159 } else {
2160 sinTheta = dy/length;
2161 cosTheta = dx/length;
2162 }
2163 vertX = poly[0] - shapeA*cosTheta;
2164 vertY = poly[1] - shapeA*sinTheta;
2165 temp = shapeC*sinTheta;
2166 poly[2] = poly[0] - shapeB*cosTheta + temp;
2167 poly[8] = poly[2] - 2*temp;
2168 temp = shapeC*cosTheta;
2169 poly[3] = poly[1] - shapeB*sinTheta - temp;
2170 poly[9] = poly[3] + 2*temp;
2171 poly[4] = poly[2]*fracHeight + vertX*(1.0-fracHeight);
2172 poly[5] = poly[3]*fracHeight + vertY*(1.0-fracHeight);
2173 poly[6] = poly[8]*fracHeight + vertX*(1.0-fracHeight);
2174 poly[7] = poly[9]*fracHeight + vertY*(1.0-fracHeight);
2175
2176 /*
2177 * Polygon done. Now move the first point towards the second so that
2178 * the corners at the end of the line are inside the arrowhead.
2179 */
2180
2181 linePtr->coordPtr[0] = poly[0] - backup*cosTheta;
2182 linePtr->coordPtr[1] = poly[1] - backup*sinTheta;
2183 }
2184
2185 /*
2186 * Similar arrowhead calculation for the last point of the line.
2187 */
2188
2189 if (linePtr->arrow != ARROWS_FIRST) {
2190 coordPtr = linePtr->coordPtr + 2*(linePtr->numPoints-2);
2191 poly = linePtr->lastArrowPtr;
2192 if (poly == NULL) {
2193 poly = (double *)ckalloc(2 * PTS_IN_ARROW * sizeof(double));
2194 poly[0] = poly[10] = coordPtr[2];
2195 poly[1] = poly[11] = coordPtr[3];
2196 linePtr->lastArrowPtr = poly;
2197 }
2198 dx = poly[0] - coordPtr[0];
2199 dy = poly[1] - coordPtr[1];
2200 length = hypot(dx, dy);
2201 if (length == 0) {
2202 sinTheta = cosTheta = 0.0;
2203 } else {
2204 sinTheta = dy/length;
2205 cosTheta = dx/length;
2206 }
2207 vertX = poly[0] - shapeA*cosTheta;
2208 vertY = poly[1] - shapeA*sinTheta;
2209 temp = shapeC * sinTheta;
2210 poly[2] = poly[0] - shapeB*cosTheta + temp;
2211 poly[8] = poly[2] - 2*temp;
2212 temp = shapeC * cosTheta;
2213 poly[3] = poly[1] - shapeB*sinTheta - temp;
2214 poly[9] = poly[3] + 2*temp;
2215 poly[4] = poly[2]*fracHeight + vertX*(1.0-fracHeight);
2216 poly[5] = poly[3]*fracHeight + vertY*(1.0-fracHeight);
2217 poly[6] = poly[8]*fracHeight + vertX*(1.0-fracHeight);
2218 poly[7] = poly[9]*fracHeight + vertY*(1.0-fracHeight);
2219 coordPtr[2] = poly[0] - backup*cosTheta;
2220 coordPtr[3] = poly[1] - backup*sinTheta;
2221 }
2222
2223 return TCL_OK;
2224 }
2225
2226 /*
2227 *--------------------------------------------------------------
2228 *
2229 * LineToPostscript --
2230 *
2231 * This function is called to generate Postscript for line items.
2232 *
2233 * Results:
2234 * The return value is a standard Tcl result. If an error occurs in
2235 * generating Postscript then an error message is left in the interp's
2236 * result, replacing whatever used to be there. If no error occurs, then
2237 * Postscript for the item is appended to the result.
2238 *
2239 * Side effects:
2240 * None.
2241 *
2242 *--------------------------------------------------------------
2243 */
2244
2245 static int
LineToPostscript(Tcl_Interp * interp,Tk_Canvas canvas,Tk_Item * itemPtr,TCL_UNUSED (int))2246 LineToPostscript(
2247 Tcl_Interp *interp, /* Leave Postscript or error message here. */
2248 Tk_Canvas canvas, /* Information about overall canvas. */
2249 Tk_Item *itemPtr, /* Item for which Postscript is wanted. */
2250 TCL_UNUSED(int)) /* 1 means this is a prepass to collect font
2251 * information; 0 means final Postscript is
2252 * being created. */
2253 {
2254 LineItem *linePtr = (LineItem *) itemPtr;
2255 int style;
2256 double width;
2257 XColor *color;
2258 Pixmap stipple;
2259 Tk_State state = itemPtr->state;
2260 Tcl_Obj *psObj;
2261 Tcl_InterpState interpState;
2262
2263 if (state == TK_STATE_NULL) {
2264 state = Canvas(canvas)->canvas_state;
2265 }
2266
2267 width = linePtr->outline.width;
2268 color = linePtr->outline.color;
2269 stipple = linePtr->outline.stipple;
2270 if (Canvas(canvas)->currentItemPtr == itemPtr) {
2271 if (linePtr->outline.activeWidth > width) {
2272 width = linePtr->outline.activeWidth;
2273 }
2274 if (linePtr->outline.activeColor != NULL) {
2275 color = linePtr->outline.activeColor;
2276 }
2277 if (linePtr->outline.activeStipple != None) {
2278 stipple = linePtr->outline.activeStipple;
2279 }
2280 } else if (state == TK_STATE_DISABLED) {
2281 if (linePtr->outline.disabledWidth > 0) {
2282 width = linePtr->outline.disabledWidth;
2283 }
2284 if (linePtr->outline.disabledColor != NULL) {
2285 color = linePtr->outline.disabledColor;
2286 }
2287 if (linePtr->outline.disabledStipple != None) {
2288 stipple = linePtr->outline.disabledStipple;
2289 }
2290 }
2291
2292 if (color == NULL || linePtr->numPoints < 1 || linePtr->coordPtr == NULL){
2293 return TCL_OK;
2294 }
2295
2296 /*
2297 * Make our working space.
2298 */
2299
2300 psObj = Tcl_NewObj();
2301 interpState = Tcl_SaveInterpState(interp, TCL_OK);
2302
2303 /*
2304 * Check if we're just doing a "pixel".
2305 */
2306
2307 if (linePtr->numPoints == 1) {
2308 Tcl_AppendToObj(psObj, "matrix currentmatrix\n", -1);
2309 Tcl_AppendPrintfToObj(psObj, "%.15g %.15g translate %.15g %.15g",
2310 linePtr->coordPtr[0], Tk_CanvasPsY(canvas, linePtr->coordPtr[1]),
2311 width/2.0, width/2.0);
2312 Tcl_AppendToObj(psObj,
2313 " scale 1 0 moveto 0 0 1 0 360 arc\nsetmatrix\n", -1);
2314
2315 Tcl_ResetResult(interp);
2316 if (Tk_CanvasPsColor(interp, canvas, color) != TCL_OK) {
2317 goto error;
2318 }
2319 Tcl_AppendObjToObj(psObj, Tcl_GetObjResult(interp));
2320
2321 if (stipple != None) {
2322 Tcl_AppendToObj(psObj, "clip ", -1);
2323 Tcl_ResetResult(interp);
2324 if (Tk_CanvasPsStipple(interp, canvas, stipple) != TCL_OK) {
2325 goto error;
2326 }
2327 Tcl_AppendObjToObj(psObj, Tcl_GetObjResult(interp));
2328 } else {
2329 Tcl_AppendToObj(psObj, "fill\n", -1);
2330 }
2331 goto done;
2332 }
2333
2334 /*
2335 * Generate a path for the line's center-line (do this differently for
2336 * straight lines and smoothed lines).
2337 */
2338
2339 Tcl_ResetResult(interp);
2340 if ((!linePtr->smooth) || (linePtr->numPoints < 3)) {
2341 Tk_CanvasPsPath(interp, canvas, linePtr->coordPtr, linePtr->numPoints);
2342 } else if ((stipple == None) && linePtr->smooth->postscriptProc) {
2343 linePtr->smooth->postscriptProc(interp, canvas, linePtr->coordPtr,
2344 linePtr->numPoints, linePtr->splineSteps);
2345 } else {
2346 /*
2347 * Special hack: Postscript printers don't appear to be able to turn a
2348 * path drawn with "curveto"s into a clipping path without exceeding
2349 * resource limits, so TkMakeBezierPostscript won't work for stippled
2350 * curves. Instead, generate all of the intermediate points here and
2351 * output them into the Postscript file with "lineto"s instead.
2352 */
2353
2354 double staticPoints[2*MAX_STATIC_POINTS];
2355 double *pointPtr;
2356 int numPoints;
2357
2358 numPoints = linePtr->smooth->coordProc(canvas, NULL,
2359 linePtr->numPoints, linePtr->splineSteps, NULL, NULL);
2360 pointPtr = staticPoints;
2361 if (numPoints > MAX_STATIC_POINTS) {
2362 pointPtr = (double *)ckalloc(numPoints * 2 * sizeof(double));
2363 }
2364 numPoints = linePtr->smooth->coordProc(canvas, linePtr->coordPtr,
2365 linePtr->numPoints, linePtr->splineSteps, NULL, pointPtr);
2366 Tk_CanvasPsPath(interp, canvas, pointPtr, numPoints);
2367 if (pointPtr != staticPoints) {
2368 ckfree(pointPtr);
2369 }
2370 }
2371 Tcl_AppendObjToObj(psObj, Tcl_GetObjResult(interp));
2372
2373 /*
2374 * Set other line-drawing parameters and stroke out the line.
2375 */
2376
2377 if (linePtr->capStyle == CapRound) {
2378 style = 1;
2379 } else if (linePtr->capStyle == CapProjecting) {
2380 style = 2;
2381 } else {
2382 style = 0;
2383 }
2384 Tcl_AppendPrintfToObj(psObj, "%d setlinecap\n", style);
2385 if (linePtr->joinStyle == JoinRound) {
2386 style = 1;
2387 } else if (linePtr->joinStyle == JoinBevel) {
2388 style = 2;
2389 } else {
2390 style = 0;
2391 }
2392 Tcl_AppendPrintfToObj(psObj, "%d setlinejoin\n", style);
2393
2394 Tcl_ResetResult(interp);
2395 if (Tk_CanvasPsOutline(canvas, itemPtr, &linePtr->outline) != TCL_OK) {
2396 goto error;
2397 }
2398 Tcl_AppendObjToObj(psObj, Tcl_GetObjResult(interp));
2399
2400 /*
2401 * Output polygons for the arrowheads, if there are any.
2402 */
2403
2404 if (linePtr->firstArrowPtr != NULL) {
2405 if (stipple != None) {
2406 Tcl_AppendToObj(psObj, "grestore gsave\n", -1);
2407 }
2408 if (ArrowheadPostscript(interp, canvas, linePtr,
2409 linePtr->firstArrowPtr, psObj) != TCL_OK) {
2410 goto error;
2411 }
2412 }
2413 if (linePtr->lastArrowPtr != NULL) {
2414 if (stipple != None) {
2415 Tcl_AppendToObj(psObj, "grestore gsave\n", -1);
2416 }
2417 if (ArrowheadPostscript(interp, canvas, linePtr,
2418 linePtr->lastArrowPtr, psObj) != TCL_OK) {
2419 goto error;
2420 }
2421 }
2422
2423 /*
2424 * Plug the accumulated postscript back into the result.
2425 */
2426
2427 done:
2428 (void) Tcl_RestoreInterpState(interp, interpState);
2429 Tcl_AppendObjToObj(Tcl_GetObjResult(interp), psObj);
2430 Tcl_DecrRefCount(psObj);
2431 return TCL_OK;
2432
2433 error:
2434 Tcl_DiscardInterpState(interpState);
2435 Tcl_DecrRefCount(psObj);
2436 return TCL_ERROR;
2437 }
2438
2439 /*
2440 *--------------------------------------------------------------
2441 *
2442 * ArrowheadPostscript --
2443 *
2444 * This function is called to generate Postscript for an arrowhead for a
2445 * line item.
2446 *
2447 * Results:
2448 * The return value is a standard Tcl result. If an error occurs in
2449 * generating Postscript then an error message is left in the interp's
2450 * result, replacing whatever used to be there. If no error occurs, then
2451 * Postscript for the arrowhead is appended to the given object.
2452 *
2453 * Side effects:
2454 * None.
2455 *
2456 *--------------------------------------------------------------
2457 */
2458
2459 static int
ArrowheadPostscript(Tcl_Interp * interp,Tk_Canvas canvas,LineItem * linePtr,double * arrowPtr,Tcl_Obj * psObj)2460 ArrowheadPostscript(
2461 Tcl_Interp *interp, /* Leave error message here; non-error results
2462 * will be discarded by caller. */
2463 Tk_Canvas canvas, /* Information about overall canvas. */
2464 LineItem *linePtr, /* Line item for which Postscript is being
2465 * generated. */
2466 double *arrowPtr, /* Pointer to first of five points describing
2467 * arrowhead polygon. */
2468 Tcl_Obj *psObj) /* Append postscript to this object. */
2469 {
2470 Pixmap stipple;
2471 Tk_State state = linePtr->header.state;
2472
2473 if (state == TK_STATE_NULL) {
2474 state = Canvas(canvas)->canvas_state;
2475 }
2476
2477 stipple = linePtr->outline.stipple;
2478 if (Canvas(canvas)->currentItemPtr == (Tk_Item *) linePtr) {
2479 if (linePtr->outline.activeStipple!=None) {
2480 stipple = linePtr->outline.activeStipple;
2481 }
2482 } else if (state == TK_STATE_DISABLED) {
2483 if (linePtr->outline.activeStipple!=None) {
2484 stipple = linePtr->outline.disabledStipple;
2485 }
2486 }
2487
2488 Tcl_ResetResult(interp);
2489 Tk_CanvasPsPath(interp, canvas, arrowPtr, PTS_IN_ARROW);
2490 Tcl_AppendObjToObj(psObj, Tcl_GetObjResult(interp));
2491
2492 if (stipple != None) {
2493 Tcl_AppendToObj(psObj, "clip ", -1);
2494
2495 Tcl_ResetResult(interp);
2496 if (Tk_CanvasPsStipple(interp, canvas, stipple) != TCL_OK) {
2497 return TCL_ERROR;
2498 }
2499 Tcl_AppendObjToObj(psObj, Tcl_GetObjResult(interp));
2500 } else {
2501 Tcl_AppendToObj(psObj, "fill\n", -1);
2502 }
2503 return TCL_OK;
2504 }
2505
2506 /*
2507 * Local Variables:
2508 * mode: c
2509 * c-basic-offset: 4
2510 * fill-column: 78
2511 * End:
2512 */
2513