progs/egl/openvg/trivial/radialgrad.c

   1 #include "eglcommon.h"
   2
   3 #include <VG/openvg.h>
   4
   5 #include <stdio.h>
   6 #include <string.h>
   7
   8 static const VGfloat white_color[4] = {1.0, 1.0, 1.0, 1.0};
   9
  10 static VGPath path;
  11 static VGPaint fill;
  12
  13
  14 VGfloat centeredGradient[5] = {200.0f, 200.0f, 200.0f, 200.0f, 100};
  15 VGfloat noncenteredGradient[5] = {200.0f, 200.0f, 250.0f, 250.0f, 100};
  16 VGfloat *radialGradient = centeredGradient;
  17
  18 VGColorRampSpreadMode spread = VG_COLOR_RAMP_SPREAD_PAD;
  19
  20 static void
  21 init(void)
  22 {
  23    static const VGubyte sqrCmds[5] = {VG_MOVE_TO_ABS, VG_HLINE_TO_ABS, VG_VLINE_TO_ABS, VG_HLINE_TO_ABS, VG_CLOSE_PATH};
  24    static const VGfloat sqrCoords[5]   = {0.0f, 0.0f, 400.0f, 400.0f, 0.0f};
  25
  26    VGfloat rampStop[] = {0.00f, 1.0f, 1.0f, 1.0f, 1.0f,
  27                          0.33f, 1.0f, 0.0f, 0.0f, 1.0f,
  28                          0.66f, 0.0f, 1.0f, 0.0f, 1.0f,
  29                          1.00f, 0.0f, 0.0f,  1.0f, 1.0f};
  30
  31    path = vgCreatePath(VG_PATH_FORMAT_STANDARD, VG_PATH_DATATYPE_F, 1, 0, 0, 0,
  32                        VG_PATH_CAPABILITY_APPEND_TO);
  33    vgAppendPathData(path, 5, sqrCmds, sqrCoords);
  34
  35    fill = vgCreatePaint();
  36    vgSetPaint(fill, VG_FILL_PATH);
  37
  38    vgSetParameteri(fill, VG_PAINT_TYPE, VG_PAINT_TYPE_RADIAL_GRADIENT);
  39    vgSetParameteri(fill, VG_PAINT_COLOR_RAMP_SPREAD_MODE, spread);
  40    vgSetParameterfv(fill, VG_PAINT_RADIAL_GRADIENT, 5, radialGradient);
  41    vgSetParameterfv(fill, VG_PAINT_COLOR_RAMP_STOPS, 20, rampStop);
  42
  43    vgSetfv(VG_CLEAR_COLOR, 4, white_color);
  44 }
  45
  46 /* new window size or exposure */
  47 static void
  48 reshape(int w, int h)
  49 {
  50    vgLoadIdentity();
  51 }
  52
  53 static void
  54 draw(void)
  55 {
  56    vgClear(0, 0, window_width(), window_height());
  57
  58    vgDrawPath(path, VG_FILL_PATH);
  59
  60    vgFlush();
  61 }
  62
  63
  64 int main(int argc, char **argv)
  65 {
  66    VGint i;
  67    for (i = 1; i < argc; ++i) {
  68       const char *arg = argv[i];
  69       if (!strcmp("-pad", arg))
  70          spread = VG_COLOR_RAMP_SPREAD_PAD;
  71       else if (!strcmp("-repeat", arg))
  72          spread = VG_COLOR_RAMP_SPREAD_REPEAT;
  73       else if (!strcmp("-reflect", arg))
  74          spread = VG_COLOR_RAMP_SPREAD_REFLECT;
  75       else if (!strcmp("-center", arg)) {
  76          printf("Centered radial gradient\n");
  77          radialGradient = centeredGradient;
  78       } else if (!strcmp("-noncenter", arg)) {
  79          printf("Non centered radial gradient\n");
  80          radialGradient = noncenteredGradient;
  81       }
  82    }
  83
  84    switch(spread) {
  85    case VG_COLOR_RAMP_SPREAD_PAD:
  86       printf("Using spread mode: pad\n");
  87       break;
  88    case VG_COLOR_RAMP_SPREAD_REPEAT:
  89       printf("Using spread mode: repeat\n");
  90       break;
  91    case VG_COLOR_RAMP_SPREAD_REFLECT:
  92       printf("Using spread mode: reflect\n");
  93    }
  94
  95    set_window_size(400, 400);
  96
  97    return run(argc, argv, init, reshape,
  98               draw, 0);
  99 }