1 //
2 // "$Id: Fl_Dial.cxx 5472 2006-09-20 03:03:14Z mike $"
3 //
4 // Circular dial widget for the Fast Light Tool Kit (FLTK).
5 //
6 // Copyright 1998-2006 by Bill Spitzak and others.
7 //
8 // This library is free software; you can redistribute it and/or
9 // modify it under the terms of the GNU Library General Public
10 // License as published by the Free Software Foundation; either
11 // version 2 of the License, or (at your option) any later version.
12 //
13 // This library is distributed in the hope that it will be useful,
14 // but WITHOUT ANY WARRANTY; without even the implied warranty of
15 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 // Library General Public License for more details.
17 //
18 // You should have received a copy of the GNU Library General Public
19 // License along with this library; if not, write to the Free Software
20 // Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301
21 // USA.
22 //
23 // Please report all bugs and problems on the following page:
24 //
25 // http://www.fltk.org/str.php
26 //
27
28 #include <FL/Fl.H>
29 #include <FL/Fl_Dial.H>
30 #include <FL/fl_draw.H>
31 #include <stdlib.h>
32 #include <FL/math.h>
33
34 // All angles are measured with 0 to the right and counter-clockwise
35
draw(int X,int Y,int W,int H)36 void Fl_Dial::draw(int X, int Y, int W, int H) {
37 if (damage()&FL_DAMAGE_ALL) draw_box(box(), X, Y, W, H, color());
38 X += Fl::box_dx(box());
39 Y += Fl::box_dy(box());
40 W -= Fl::box_dw(box());
41 H -= Fl::box_dh(box());
42 double angle = (a2-a1)*(value()-minimum())/(maximum()-minimum()) + a1;
43 if (type() == FL_FILL_DIAL) {
44 // foo: draw this nicely in certain round box types
45 int foo = (box() > _FL_ROUND_UP_BOX && Fl::box_dx(box()));
46 if (foo) {X--; Y--; W+=2; H+=2;}
47 if (active_r()) fl_color(color());
48 else fl_color(fl_inactive(color()));
49 fl_pie(X, Y, W, H, 270-a1, angle > a1 ? 360+270-angle : 270-360-angle);
50 if (active_r()) fl_color(selection_color());
51 else fl_color(fl_inactive(selection_color()));
52 fl_pie(X, Y, W, H, 270-angle, 270-a1);
53 if (foo) {
54 if (active_r()) fl_color(FL_FOREGROUND_COLOR);
55 else fl_color(fl_inactive(FL_FOREGROUND_COLOR));
56 fl_arc(X, Y, W, H, 0, 360);
57 }
58 return;
59 }
60 if (!(damage()&FL_DAMAGE_ALL)) {
61 if (active_r()) fl_color(color());
62 else fl_color(fl_inactive(color()));
63 fl_pie(X+1, Y+1, W-2, H-2, 0, 360);
64 }
65 fl_push_matrix();
66 fl_translate(X+W/2-.5, Y+H/2-.5);
67 fl_scale(W-1, H-1);
68 fl_rotate(45-angle);
69 if (active_r()) fl_color(selection_color());
70 else fl_color(fl_inactive(selection_color()));
71 if (type()) { // FL_LINE_DIAL
72 fl_begin_polygon();
73 fl_vertex(0.0, 0.0);
74 fl_vertex(-0.04, 0.0);
75 fl_vertex(-0.25, 0.25);
76 fl_vertex(0.0, 0.04);
77 fl_end_polygon();
78 if (active_r()) fl_color(FL_FOREGROUND_COLOR);
79 else fl_color(fl_inactive(FL_FOREGROUND_COLOR));
80 fl_begin_loop();
81 fl_vertex(0.0, 0.0);
82 fl_vertex(-0.04, 0.0);
83 fl_vertex(-0.25, 0.25);
84 fl_vertex(0.0, 0.04);
85 fl_end_loop();
86 } else {
87 fl_begin_polygon(); fl_circle(-0.20, 0.20, 0.07); fl_end_polygon();
88 if (active_r()) fl_color(FL_FOREGROUND_COLOR);
89 else fl_color(fl_inactive(FL_FOREGROUND_COLOR));
90 fl_begin_loop(); fl_circle(-0.20, 0.20, 0.07); fl_end_loop();
91 }
92 fl_pop_matrix();
93 }
94
draw()95 void Fl_Dial::draw() {
96 draw(x(), y(), w(), h());
97 draw_label();
98 }
99
handle(int event,int X,int Y,int W,int H)100 int Fl_Dial::handle(int event, int X, int Y, int W, int H) {
101 switch (event) {
102 case FL_PUSH:
103 handle_push();
104 case FL_DRAG: {
105 int mx = (Fl::event_x()-X-W/2)*H;
106 int my = (Fl::event_y()-Y-H/2)*W;
107 if (!mx && !my) return 1;
108 double angle = 270-atan2((float)-my, (float)mx)*180/M_PI;
109 double oldangle = (a2-a1)*(value()-minimum())/(maximum()-minimum()) + a1;
110 while (angle < oldangle-180) angle += 360;
111 while (angle > oldangle+180) angle -= 360;
112 double val;
113 if ((a1<a2) ? (angle <= a1) : (angle >= a1)) {
114 val = minimum();
115 } else if ((a1<a2) ? (angle >= a2) : (angle <= a2)) {
116 val = maximum();
117 } else {
118 val = minimum() + (maximum()-minimum())*(angle-a1)/(a2-a1);
119 }
120 handle_drag(clamp(round(val)));
121 } return 1;
122 case FL_RELEASE:
123 handle_release();
124 return 1;
125 case FL_ENTER :
126 case FL_LEAVE :
127 return 1;
128 default:
129 return 0;
130 }
131 }
132
handle(int e)133 int Fl_Dial::handle(int e) {
134 return handle(e, x(), y(), w(), h());
135 }
136
Fl_Dial(int X,int Y,int W,int H,const char * l)137 Fl_Dial::Fl_Dial(int X, int Y, int W, int H, const char* l)
138 : Fl_Valuator(X, Y, W, H, l) {
139 box(FL_OVAL_BOX);
140 selection_color(FL_INACTIVE_COLOR); // was 37
141 a1 = 45;
142 a2 = 315;
143 }
144
145 //
146 // End of "$Id: Fl_Dial.cxx 5472 2006-09-20 03:03:14Z mike $".
147 //
148