1 /* GIMP - The GNU Image Manipulation Program
2 * Copyright (C) 1995 Spencer Kimball and Peter Mattis
3 *
4 * gimpcanvasguide.c
5 * Copyright (C) 2010 Michael Natterer <mitch@gimp.org>
6 *
7 * This program is free software: you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 3 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program. If not, see <https://www.gnu.org/licenses/>.
19 */
20
21 #include "config.h"
22
23 #include <gegl.h>
24 #include <gtk/gtk.h>
25
26 #include "libgimpbase/gimpbase.h"
27 #include "libgimpmath/gimpmath.h"
28
29 #include "display-types.h"
30
31 #include "gimpcanvas-style.h"
32 #include "gimpcanvasguide.h"
33 #include "gimpdisplayshell.h"
34
35
36 enum
37 {
38 PROP_0,
39 PROP_ORIENTATION,
40 PROP_POSITION,
41 PROP_STYLE
42 };
43
44
45 typedef struct _GimpCanvasGuidePrivate GimpCanvasGuidePrivate;
46
47 struct _GimpCanvasGuidePrivate
48 {
49 GimpOrientationType orientation;
50 gint position;
51
52 GimpGuideStyle style;
53 };
54
55 #define GET_PRIVATE(guide) \
56 ((GimpCanvasGuidePrivate *) gimp_canvas_guide_get_instance_private ((GimpCanvasGuide *) (guide)))
57
58
59 /* local function prototypes */
60
61 static void gimp_canvas_guide_set_property (GObject *object,
62 guint property_id,
63 const GValue *value,
64 GParamSpec *pspec);
65 static void gimp_canvas_guide_get_property (GObject *object,
66 guint property_id,
67 GValue *value,
68 GParamSpec *pspec);
69 static void gimp_canvas_guide_draw (GimpCanvasItem *item,
70 cairo_t *cr);
71 static cairo_region_t * gimp_canvas_guide_get_extents (GimpCanvasItem *item);
72 static void gimp_canvas_guide_stroke (GimpCanvasItem *item,
73 cairo_t *cr);
74
75
G_DEFINE_TYPE_WITH_PRIVATE(GimpCanvasGuide,gimp_canvas_guide,GIMP_TYPE_CANVAS_ITEM)76 G_DEFINE_TYPE_WITH_PRIVATE (GimpCanvasGuide, gimp_canvas_guide,
77 GIMP_TYPE_CANVAS_ITEM)
78
79 #define parent_class gimp_canvas_guide_parent_class
80
81
82 static void
83 gimp_canvas_guide_class_init (GimpCanvasGuideClass *klass)
84 {
85 GObjectClass *object_class = G_OBJECT_CLASS (klass);
86 GimpCanvasItemClass *item_class = GIMP_CANVAS_ITEM_CLASS (klass);
87
88 object_class->set_property = gimp_canvas_guide_set_property;
89 object_class->get_property = gimp_canvas_guide_get_property;
90
91 item_class->draw = gimp_canvas_guide_draw;
92 item_class->get_extents = gimp_canvas_guide_get_extents;
93 item_class->stroke = gimp_canvas_guide_stroke;
94
95 g_object_class_install_property (object_class, PROP_ORIENTATION,
96 g_param_spec_enum ("orientation", NULL, NULL,
97 GIMP_TYPE_ORIENTATION_TYPE,
98 GIMP_ORIENTATION_HORIZONTAL,
99 GIMP_PARAM_READWRITE));
100
101 g_object_class_install_property (object_class, PROP_POSITION,
102 g_param_spec_int ("position", NULL, NULL,
103 -GIMP_MAX_IMAGE_SIZE,
104 GIMP_MAX_IMAGE_SIZE, 0,
105 GIMP_PARAM_READWRITE));
106
107 g_object_class_install_property (object_class, PROP_STYLE,
108 g_param_spec_enum ("style", NULL, NULL,
109 GIMP_TYPE_GUIDE_STYLE,
110 GIMP_GUIDE_STYLE_NONE,
111 GIMP_PARAM_READWRITE));
112 }
113
114 static void
gimp_canvas_guide_init(GimpCanvasGuide * guide)115 gimp_canvas_guide_init (GimpCanvasGuide *guide)
116 {
117 }
118
119 static void
gimp_canvas_guide_set_property(GObject * object,guint property_id,const GValue * value,GParamSpec * pspec)120 gimp_canvas_guide_set_property (GObject *object,
121 guint property_id,
122 const GValue *value,
123 GParamSpec *pspec)
124 {
125 GimpCanvasGuidePrivate *private = GET_PRIVATE (object);
126
127 switch (property_id)
128 {
129 case PROP_ORIENTATION:
130 private->orientation = g_value_get_enum (value);
131 break;
132 case PROP_POSITION:
133 private->position = g_value_get_int (value);
134 break;
135 case PROP_STYLE:
136 private->style = g_value_get_enum (value);
137 break;
138
139 default:
140 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
141 break;
142 }
143 }
144
145 static void
gimp_canvas_guide_get_property(GObject * object,guint property_id,GValue * value,GParamSpec * pspec)146 gimp_canvas_guide_get_property (GObject *object,
147 guint property_id,
148 GValue *value,
149 GParamSpec *pspec)
150 {
151 GimpCanvasGuidePrivate *private = GET_PRIVATE (object);
152
153 switch (property_id)
154 {
155 case PROP_ORIENTATION:
156 g_value_set_enum (value, private->orientation);
157 break;
158 case PROP_POSITION:
159 g_value_set_int (value, private->position);
160 break;
161 case PROP_STYLE:
162 g_value_set_enum (value, private->style);
163 break;
164
165 default:
166 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
167 break;
168 }
169 }
170
171 static void
gimp_canvas_guide_transform(GimpCanvasItem * item,gdouble * x1,gdouble * y1,gdouble * x2,gdouble * y2)172 gimp_canvas_guide_transform (GimpCanvasItem *item,
173 gdouble *x1,
174 gdouble *y1,
175 gdouble *x2,
176 gdouble *y2)
177 {
178 GimpCanvasGuidePrivate *private = GET_PRIVATE (item);
179 GtkWidget *canvas = gimp_canvas_item_get_canvas (item);
180 GtkAllocation allocation;
181 gint max_outside;
182 gint x, y;
183
184 gtk_widget_get_allocation (canvas, &allocation);
185
186 max_outside = allocation.width + allocation.height;
187
188 *x1 = -max_outside;
189 *y1 = -max_outside;
190 *x2 = allocation.width + max_outside;
191 *y2 = allocation.height + max_outside;
192
193 switch (private->orientation)
194 {
195 case GIMP_ORIENTATION_HORIZONTAL:
196 gimp_canvas_item_transform_xy (item, 0, private->position, &x, &y);
197 *y1 = *y2 = y + 0.5;
198 break;
199
200 case GIMP_ORIENTATION_VERTICAL:
201 gimp_canvas_item_transform_xy (item, private->position, 0, &x, &y);
202 *x1 = *x2 = x + 0.5;
203 break;
204
205 case GIMP_ORIENTATION_UNKNOWN:
206 return;
207 }
208 }
209
210 static void
gimp_canvas_guide_draw(GimpCanvasItem * item,cairo_t * cr)211 gimp_canvas_guide_draw (GimpCanvasItem *item,
212 cairo_t *cr)
213 {
214 gdouble x1, y1;
215 gdouble x2, y2;
216
217 gimp_canvas_guide_transform (item, &x1, &y1, &x2, &y2);
218
219 cairo_move_to (cr, x1, y1);
220 cairo_line_to (cr, x2, y2);
221
222 _gimp_canvas_item_stroke (item, cr);
223 }
224
225 static cairo_region_t *
gimp_canvas_guide_get_extents(GimpCanvasItem * item)226 gimp_canvas_guide_get_extents (GimpCanvasItem *item)
227 {
228 cairo_rectangle_int_t rectangle;
229 gdouble x1, y1;
230 gdouble x2, y2;
231
232 gimp_canvas_guide_transform (item, &x1, &y1, &x2, &y2);
233
234 rectangle.x = MIN (x1, x2) - 1.5;
235 rectangle.y = MIN (y1, y2) - 1.5;
236 rectangle.width = ABS (x2 - x1) + 3.0;
237 rectangle.height = ABS (y2 - y1) + 3.0;
238
239 return cairo_region_create_rectangle (&rectangle);
240 }
241
242 static void
gimp_canvas_guide_stroke(GimpCanvasItem * item,cairo_t * cr)243 gimp_canvas_guide_stroke (GimpCanvasItem *item,
244 cairo_t *cr)
245 {
246 GimpCanvasGuidePrivate *private = GET_PRIVATE (item);
247
248 if (private->style != GIMP_GUIDE_STYLE_NONE)
249 {
250 GimpDisplayShell *shell = gimp_canvas_item_get_shell (item);
251
252 gimp_canvas_set_guide_style (gimp_canvas_item_get_canvas (item), cr,
253 private->style,
254 gimp_canvas_item_get_highlight (item),
255 shell->offset_x, shell->offset_y);
256 cairo_stroke (cr);
257 }
258 else
259 {
260 GIMP_CANVAS_ITEM_CLASS (parent_class)->stroke (item, cr);
261 }
262 }
263
264 GimpCanvasItem *
gimp_canvas_guide_new(GimpDisplayShell * shell,GimpOrientationType orientation,gint position,GimpGuideStyle style)265 gimp_canvas_guide_new (GimpDisplayShell *shell,
266 GimpOrientationType orientation,
267 gint position,
268 GimpGuideStyle style)
269 {
270 g_return_val_if_fail (GIMP_IS_DISPLAY_SHELL (shell), NULL);
271
272 return g_object_new (GIMP_TYPE_CANVAS_GUIDE,
273 "shell", shell,
274 "orientation", orientation,
275 "position", position,
276 "style", style,
277 NULL);
278 }
279
280 void
gimp_canvas_guide_set(GimpCanvasItem * guide,GimpOrientationType orientation,gint position)281 gimp_canvas_guide_set (GimpCanvasItem *guide,
282 GimpOrientationType orientation,
283 gint position)
284 {
285 g_return_if_fail (GIMP_IS_CANVAS_GUIDE (guide));
286
287 gimp_canvas_item_begin_change (guide);
288
289 g_object_set (guide,
290 "orientation", orientation,
291 "position", position,
292 NULL);
293
294 gimp_canvas_item_end_change (guide);
295 }
296