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1 #include <math.h>
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2
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3 #ifndef __APPLE__
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4 #include <GL/gl.h>
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5 #else
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6 #include <OpenGL/gl.h>
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7 #endif
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8
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9 #include "draw.h"
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10
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11 struct color {
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12 float r, g, b, a;
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13 };
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14
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15
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16 static void linestart(int x, int y);
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17 static void lineto(int x, int y);
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18 static void arcto(int x, int y, int cx, int cy, int rad);
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19 static void arc(float x0, float y0, float x1, float y1, float cx, float cy, float rad, int subdiv);
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20
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21
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22 static struct color fgcolor = {0, 0, 0, 0.5};
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23 static struct color bgcolor = {0.4, 0.4, 0.4, 0.5};
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24
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25 void imtk_draw_color(float r, float g, float b, float a)
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26 {
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27 fgcolor.r = r;
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28 fgcolor.g = g;
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29 fgcolor.b = b;
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30 fgcolor.a = a;
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31 }
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32
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33 void imtk_draw_colorv(float *v)
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34 {
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35 fgcolor.r = v[0];
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36 fgcolor.g = v[1];
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37 fgcolor.b = v[2];
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38 fgcolor.a = v[3];
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39 }
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40
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41 void imtk_draw_background(float r, float g, float b, float a)
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42 {
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43 bgcolor.r = r;
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44 bgcolor.g = g;
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45 bgcolor.b = b;
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46 bgcolor.a = a;
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47 }
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48
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49 void imtk_draw_backgroundv(float *v)
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50 {
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51 bgcolor.r = v[0];
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52 bgcolor.g = v[1];
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53 bgcolor.b = v[2];
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54 bgcolor.a = v[3];
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55 }
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56
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57 void imtk_draw_rect(int x, int y, int w, int h, int rad)
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58 {
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59 int i;
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60
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61 glPushAttrib(GL_ENABLE_BIT | GL_LINE_BIT);
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62 glEnable(GL_LINE_SMOOTH);
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63 glEnable(GL_POLYGON_SMOOTH);
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64 glEnable(GL_BLEND);
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65 glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
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66 glLineWidth(1.5);
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67
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68 for(i=0; i<2; i++) {
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69 if(i == 0) {
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70 glBegin(GL_POLYGON);
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71 glColor4f(bgcolor.r, bgcolor.g, bgcolor.b, bgcolor.a);
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72 } else {
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73 glBegin(GL_LINE_STRIP);
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74 glColor4f(fgcolor.r, fgcolor.g, fgcolor.b, fgcolor.a);
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75 }
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76 linestart(x + rad, y);
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77 lineto(x + w - rad, y);
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78 arcto(x + w, y + rad, x + w - rad, y + rad, rad);
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79 lineto(x + w, y + h - rad);
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80 arcto(x + w - rad, y + h, x + w - rad, y + h - rad, rad);
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81 lineto(x + rad, y + h);
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82 arcto(x, y + h - rad, x + rad, y + h - rad, rad);
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83 lineto(x, y + rad);
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84 arcto(x + rad, y, x + rad, y + rad, rad);
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85 glEnd();
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86 }
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87
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88 glPopAttrib();
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89 }
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90
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91
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92 static int px, py;
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93
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94 static void linestart(int x, int y)
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95 {
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96 px = x;
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97 py = y;
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98 glVertex2i(x, y);
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99 }
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100
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101 static void lineto(int x, int y)
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102 {
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103 px = x;
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104 py = y;
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105 glVertex2i(x, y);
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106 }
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107
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108 static void arcto(int x, int y, int cx, int cy, int rad)
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109 {
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110 arc(px, py, x, y, cx, cy, rad, 1);
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111 }
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112
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113 static void arc(float x0, float y0, float x1, float y1, float cx, float cy, float rad, int subdiv)
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114 {
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115 float x, y, vx, vy, len;
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116
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117 x = x0 + (x1 - x0) * 0.5;
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118 y = y0 + (y1 - y0) * 0.5;
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119 vx = x - cx;
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120 vy = y - cy;
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121 len = sqrt(vx * vx + vy * vy);
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122 x = cx + vx * rad / len;
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123 y = cy + vy * rad / len;
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124
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125 if(!subdiv) {
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126 glVertex2f(x, y);
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127 glVertex2f(x1, y1);
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128 return;
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129 }
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130
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131 arc(x0, y0, x, y, cx, cy, rad, subdiv - 1);
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132 arc(x, y, x1, y1, cx, cy, rad, subdiv - 1);
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133 }
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