1 | /* test_gradient.c */ |
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2 | |
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3 | #include <math.h> |
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4 | #include <gtk/gtk.h> |
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5 | #include "art_point.h" |
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6 | #include "art_misc.h" |
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7 | #include "art_affine.h" |
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8 | #include "art_svp.h" |
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9 | #include "art_svp_vpath.h" |
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10 | #include "art_rgb.h" |
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11 | #include "art_rgb_svp.h" |
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12 | #include "art_render.h" |
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13 | #include "art_render_gradient.h" |
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14 | |
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15 | GtkWidget *drawing_area; |
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16 | static art_u8 *rgbdata = NULL; |
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17 | int width, height; |
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18 | |
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19 | double pos_x[2], pos_y[2]; |
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20 | int pos_nr = 0; |
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21 | |
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22 | double a = 1/32.0; |
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23 | double b = -1/33.00000; |
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24 | double c = -1/3.0; |
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25 | ArtGradientSpread spread = ART_GRADIENT_REPEAT; |
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26 | |
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27 | ArtVpath * |
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28 | randstar (int n) |
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29 | { |
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30 | ArtVpath *vec; |
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31 | int i; |
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32 | double r, th; |
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33 | |
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34 | vec = art_new (ArtVpath, n + 2); |
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35 | for (i = 0; i < n; i++) |
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36 | { |
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37 | vec[i].code = i ? ART_LINETO : ART_MOVETO; |
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38 | r = rand () * (250.0 / RAND_MAX); |
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39 | th = i * 2 * M_PI / n; |
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40 | vec[i].x = 250 + r * cos (th); |
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41 | vec[i].y = 250 - r * sin (th); |
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42 | } |
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43 | vec[i].code = ART_LINETO; |
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44 | vec[i].x = vec[0].x; |
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45 | vec[i].y = vec[0].y; |
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46 | i++; |
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47 | vec[i].code = ART_END; |
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48 | vec[i].x = 0; |
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49 | vec[i].y = 0; |
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50 | return vec; |
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51 | } |
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52 | |
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53 | ArtVpath * |
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54 | rect (void) |
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55 | { |
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56 | ArtVpath *vec; |
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57 | int i; |
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58 | double r, th; |
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59 | |
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60 | #define START 0 |
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61 | |
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62 | vec = art_new (ArtVpath, 6); |
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63 | vec[0].code = ART_MOVETO; |
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64 | vec[0].x = START; |
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65 | vec[0].y = START; |
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66 | vec[1].code = ART_LINETO; |
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67 | vec[1].x = START; |
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68 | vec[1].y = 512-START; |
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69 | vec[2].code = ART_LINETO; |
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70 | vec[2].x = 512-START; |
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71 | vec[2].y = 512-START; |
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72 | vec[3].code = ART_LINETO; |
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73 | vec[3].x = 512-START; |
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74 | vec[3].y = START; |
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75 | vec[4].code = ART_LINETO; |
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76 | vec[4].x = START; |
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77 | vec[4].y = START; |
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78 | vec[5].code = ART_END; |
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79 | vec[5].x = 0; |
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80 | vec[5].y = 0; |
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81 | |
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82 | return vec; |
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83 | } |
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84 | |
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85 | |
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86 | static void |
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87 | draw_test() |
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88 | { |
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89 | static ArtVpath *vpath = NULL; |
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90 | static ArtSVP *svp = NULL; |
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91 | ArtRender *render; |
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92 | ArtPixMaxDepth color[3] = {0x0000, 0x0000, 0x8000 }; |
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93 | ArtGradientLinear gradient; |
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94 | ArtGradientStop stops[3] = { |
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95 | { 0.02, { 0x7fff, 0x0000, 0x0000, 0x7fff }}, |
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96 | { 0.5, { 0x0000, 0x0000, 0x0000, 0x1000 }}, |
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97 | { 0.98, { 0x0000, 0x7fff, 0x0000, 0x7fff }} |
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98 | }; |
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99 | |
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100 | if (!vpath) { |
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101 | vpath = rect (); |
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102 | svp = art_svp_from_vpath (vpath); |
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103 | } |
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104 | |
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105 | gradient.a = a; |
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106 | gradient.b = b; |
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107 | gradient.c = c; |
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108 | gradient.spread = spread; |
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109 | |
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110 | gradient.n_stops = sizeof(stops) / sizeof(stops[0]); |
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111 | gradient.stops = stops; |
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112 | |
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113 | render = art_render_new (0, 0, |
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114 | width, height, |
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115 | rgbdata, width * 3, |
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116 | 3, 8, ART_ALPHA_NONE, |
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117 | NULL); |
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118 | art_render_clear_rgb (render, 0xfff0c0); |
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119 | art_render_svp (render, svp); |
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120 | art_render_gradient_linear (render, &gradient, ART_FILTER_NEAREST); |
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121 | // art_render_image_solid (render, color); |
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122 | art_render_invoke (render); |
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123 | } |
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124 | |
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125 | /* Create a new backing pixmap of the appropriate size */ |
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126 | static gint configure_event( GtkWidget *widget, |
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127 | GdkEventConfigure *event ) |
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128 | { |
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129 | if (rgbdata) |
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130 | free(rgbdata); |
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131 | |
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132 | rgbdata = malloc(3*widget->allocation.width*widget->allocation.height); |
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133 | width = widget->allocation.width; |
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134 | height = widget->allocation.height; |
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135 | |
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136 | draw_test(); |
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137 | |
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138 | return TRUE; |
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139 | } |
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140 | |
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141 | /* Redraw the screen from the backing pixmap */ |
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142 | static gint expose_event( GtkWidget *widget, |
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143 | GdkEventExpose *event ) |
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144 | { |
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145 | static GdkGC *copy_gc = NULL; |
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146 | |
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147 | if (copy_gc == NULL) { |
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148 | copy_gc = gdk_gc_new(widget->window); |
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149 | } |
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150 | |
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151 | gdk_draw_rgb_image(widget->window, |
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152 | copy_gc, |
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153 | event->area.x, event->area.y, |
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154 | event->area.width, event->area.height, |
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155 | GDK_RGB_DITHER_NONE, |
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156 | rgbdata + event->area.x*3+event->area.y*3*width, |
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157 | width*3 ); |
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158 | |
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159 | return FALSE; |
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160 | } |
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161 | |
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162 | static gint button_press_event( GtkWidget *widget, |
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163 | GdkEventButton *event ) |
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164 | { |
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165 | static GdkGC *copy_gc = NULL; |
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166 | int x, y; |
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167 | |
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168 | x = event->x; |
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169 | y = event->y; |
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170 | |
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171 | pos_x[pos_nr] = (double) x; |
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172 | pos_y[pos_nr] = (double) y; |
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173 | |
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174 | pos_nr = (pos_nr+1) % 2; |
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175 | |
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176 | draw_test(); |
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177 | |
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178 | if (copy_gc == NULL) { |
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179 | copy_gc = gdk_gc_new(widget->window); |
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180 | } |
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181 | |
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182 | gdk_draw_rgb_image(widget->window, |
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183 | copy_gc, |
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184 | 0, 0, |
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185 | width, height, |
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186 | GDK_RGB_DITHER_NONE, |
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187 | rgbdata, width*3 ); |
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188 | |
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189 | return TRUE; |
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190 | } |
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191 | |
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192 | static gint motion_notify_event( GtkWidget *widget, |
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193 | GdkEventMotion *event ) |
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194 | { |
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195 | static GdkGC *copy_gc = NULL; |
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196 | int x, y; |
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197 | GdkModifierType state; |
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198 | |
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199 | if (event->is_hint) { |
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200 | gdk_window_get_pointer (event->window, &x, &y, &state); |
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201 | } else { |
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202 | x = event->x; |
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203 | y = event->y; |
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204 | state = event->state; |
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205 | } |
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206 | |
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207 | if (state & GDK_BUTTON1_MASK && rgbdata != NULL) { |
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208 | |
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209 | pos_x[(pos_nr+1) % 2] = (double) x; |
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210 | pos_y[(pos_nr+1) % 2] = (double) y; |
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211 | |
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212 | draw_test(); |
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213 | |
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214 | if (copy_gc == NULL) { |
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215 | copy_gc = gdk_gc_new(widget->window); |
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216 | } |
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217 | |
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218 | gdk_draw_rgb_image(widget->window, |
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219 | copy_gc, |
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220 | 0, 0, |
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221 | width, height, |
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222 | GDK_RGB_DITHER_NONE, |
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223 | rgbdata, width*3 ); |
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224 | } |
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225 | |
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226 | return TRUE; |
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227 | } |
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228 | |
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229 | void quit () |
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230 | { |
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231 | gtk_exit (0); |
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232 | } |
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233 | |
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234 | static void |
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235 | change_gradient (GtkEntry *entry, |
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236 | double *ptr) |
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237 | { |
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238 | double d; |
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239 | d = g_ascii_strtod (gtk_entry_get_text (entry), NULL); |
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240 | if (d != 0.0) |
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241 | *ptr = 1.0/d; |
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242 | else |
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243 | *ptr = 0.0; |
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244 | draw_test(); |
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245 | gtk_widget_queue_draw (drawing_area); |
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246 | } |
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247 | |
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248 | static void |
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249 | change_spread (GtkEntry *entry, |
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250 | int *ptr) |
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251 | { |
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252 | double d; |
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253 | d = g_ascii_strtod (gtk_entry_get_text (entry), NULL); |
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254 | *ptr = (int)d; |
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255 | draw_test(); |
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256 | gtk_widget_queue_draw (drawing_area); |
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257 | } |
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258 | |
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259 | |
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260 | int main( int argc, |
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261 | char *argv[] ) |
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262 | { |
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263 | GtkWidget *window; |
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264 | GtkWidget *vbox; |
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265 | char buf[G_ASCII_DTOSTR_BUF_SIZE]; |
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266 | |
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267 | GtkWidget *button; |
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268 | GtkWidget *entry; |
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269 | |
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270 | gtk_init (&argc, &argv); |
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271 | |
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272 | gdk_rgb_init(); |
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273 | |
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274 | pos_x[0] = 100; |
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275 | pos_y[0] = 100; |
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276 | pos_x[1] = 300; |
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277 | pos_y[1] = 300; |
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278 | |
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279 | window = gtk_window_new (GTK_WINDOW_TOPLEVEL); |
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280 | gtk_widget_set_name (window, "Test Input"); |
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281 | |
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282 | vbox = gtk_vbox_new (FALSE, 0); |
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283 | gtk_container_add (GTK_CONTAINER (window), vbox); |
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284 | gtk_widget_show (vbox); |
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285 | |
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286 | gtk_signal_connect (GTK_OBJECT (window), "destroy", |
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287 | GTK_SIGNAL_FUNC (quit), NULL); |
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288 | |
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289 | /* Create the drawing area */ |
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290 | |
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291 | drawing_area = gtk_drawing_area_new (); |
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292 | gtk_drawing_area_size (GTK_DRAWING_AREA (drawing_area), 512, 512); |
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293 | gtk_box_pack_start (GTK_BOX (vbox), drawing_area, TRUE, TRUE, 0); |
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294 | |
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295 | gtk_widget_show (drawing_area); |
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296 | |
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297 | /* Signals used to handle backing pixmap */ |
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298 | |
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299 | gtk_signal_connect (GTK_OBJECT (drawing_area), "expose_event", |
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300 | (GtkSignalFunc) expose_event, NULL); |
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301 | gtk_signal_connect (GTK_OBJECT(drawing_area),"configure_event", |
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302 | (GtkSignalFunc) configure_event, NULL); |
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303 | |
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304 | /* Event signals */ |
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305 | |
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306 | gtk_signal_connect (GTK_OBJECT (drawing_area), "motion_notify_event", |
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307 | (GtkSignalFunc) motion_notify_event, NULL); |
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308 | gtk_signal_connect (GTK_OBJECT (drawing_area), "button_press_event", |
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309 | (GtkSignalFunc) button_press_event, NULL); |
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310 | |
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311 | gtk_widget_set_events (drawing_area, GDK_EXPOSURE_MASK |
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312 | | GDK_LEAVE_NOTIFY_MASK |
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313 | | GDK_BUTTON_PRESS_MASK |
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314 | | GDK_POINTER_MOTION_MASK |
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315 | | GDK_POINTER_MOTION_HINT_MASK); |
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316 | |
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317 | |
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318 | entry = gtk_entry_new (); |
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319 | gtk_box_pack_start (GTK_BOX (vbox), entry, FALSE, FALSE, 0); |
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320 | |
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321 | gtk_signal_connect (GTK_OBJECT (entry), "activate", |
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322 | GTK_SIGNAL_FUNC (change_gradient), |
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323 | &a); |
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324 | gtk_entry_set_text (GTK_ENTRY (entry), |
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325 | g_ascii_dtostr (buf, G_ASCII_DTOSTR_BUF_SIZE, |
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326 | 1.0/a)); |
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327 | gtk_widget_show (entry); |
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328 | |
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329 | entry = gtk_entry_new (); |
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330 | gtk_box_pack_start (GTK_BOX (vbox), entry, FALSE, FALSE, 0); |
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331 | |
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332 | gtk_signal_connect (GTK_OBJECT (entry), "activate", |
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333 | GTK_SIGNAL_FUNC (change_gradient), |
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334 | &b); |
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335 | gtk_entry_set_text (GTK_ENTRY (entry), |
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336 | g_ascii_dtostr (buf, G_ASCII_DTOSTR_BUF_SIZE, |
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337 | 1.0/b)); |
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338 | gtk_widget_show (entry); |
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339 | |
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340 | entry = gtk_entry_new (); |
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341 | gtk_box_pack_start (GTK_BOX (vbox), entry, FALSE, FALSE, 0); |
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342 | |
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343 | gtk_signal_connect (GTK_OBJECT (entry), "activate", |
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344 | GTK_SIGNAL_FUNC (change_gradient), |
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345 | &c); |
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346 | gtk_entry_set_text (GTK_ENTRY (entry), |
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347 | g_ascii_dtostr (buf, G_ASCII_DTOSTR_BUF_SIZE, |
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348 | 1.0/c)); |
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349 | gtk_widget_show (entry); |
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350 | |
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351 | entry = gtk_entry_new (); |
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352 | gtk_box_pack_start (GTK_BOX (vbox), entry, FALSE, FALSE, 0); |
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353 | |
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354 | gtk_signal_connect (GTK_OBJECT (entry), "activate", |
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355 | GTK_SIGNAL_FUNC (change_spread), |
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356 | &spread); |
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357 | gtk_entry_set_text (GTK_ENTRY (entry), |
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358 | g_strdup_printf ("%d", spread)); |
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359 | gtk_widget_show (entry); |
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360 | |
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361 | |
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362 | /* .. And a quit button */ |
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363 | button = gtk_button_new_with_label ("Quit"); |
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364 | gtk_box_pack_start (GTK_BOX (vbox), button, FALSE, FALSE, 0); |
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365 | |
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366 | gtk_signal_connect_object (GTK_OBJECT (button), "clicked", |
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367 | GTK_SIGNAL_FUNC (gtk_widget_destroy), |
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368 | GTK_OBJECT (window)); |
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369 | gtk_widget_show (button); |
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370 | |
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371 | gtk_widget_show (window); |
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372 | |
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373 | gtk_main (); |
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374 | |
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375 | return 0; |
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376 | } |
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