progs/egl/openvg/trivial/ellipse.c

   1 #include "eglcommon.h"
   2
   3 #include <VG/openvg.h>
   4
   5 #include <math.h>
   6 #include <stdlib.h>
   7
   8 const VGfloat white_color[4] = {1.0, 1.0, 1.0, 1.0};
   9 const VGfloat color[4] = {0.0, 0.0, 0.0, 1.0};
  10
  11 VGPath path;
  12 VGPaint paint;
  13
  14 static void
  15 init(void)
  16 {
  17    VGfloat clearColor[] = {1.0f, 1.0f, 1.0f, 1.0f};/* white color */
  18    VGfloat fillColor[] = {1.0f, 0.0f, 0.0f, 1.0f};/* red color */
  19    static const VGubyte segments[4] = {VG_MOVE_TO_ABS,
  20                                        VG_SCCWARC_TO_ABS,
  21                                        VG_SCCWARC_TO_ABS,
  22                                        VG_CLOSE_PATH};
  23    VGfloat data[12];
  24    const VGfloat cx = 0, cy=29, width=80, height=40;
  25    const VGfloat hw = width * 0.5f;
  26    const VGfloat hh = height * 0.5f;
  27
  28    data[0] = cx + hw;
  29    data[1] = cy;
  30    data[2] = hw;
  31    data[3] = hh;
  32    data[4] = 0;
  33    data[5] = cx - hw;
  34    data[6] = cy;
  35    data[7] = hw;
  36    data[8] = hh;
  37    data[9] = 0;
  38    data[10] = data[0];
  39    data[11] = cy;
  40
  41    vgSetfv(VG_CLEAR_COLOR, 4, clearColor);
  42    vgSeti(VG_RENDERING_QUALITY, VG_RENDERING_QUALITY_NONANTIALIASED);
  43
  44
  45    path = vgCreatePath(VG_PATH_FORMAT_STANDARD, VG_PATH_DATATYPE_F,
  46                        1.0f, 0.0f, 0, 0, VG_PATH_CAPABILITY_ALL);
  47    if (path == VG_INVALID_HANDLE) {
  48       return;
  49    }
  50    paint = vgCreatePaint();
  51    if (paint == VG_INVALID_HANDLE) {
  52       vgDestroyPath(path);
  53       return;
  54    }
  55
  56    vgAppendPathData(path, 4, segments, data);
  57    vgSetParameterfv(paint, VG_PAINT_COLOR, 4, fillColor);
  58    vgSetParameteri( paint, VG_PAINT_TYPE, VG_PAINT_TYPE_COLOR);
  59    vgSetPaint(paint, VG_FILL_PATH);
  60 }
  61
  62 /* new window size or exposure */
  63 static void
  64 reshape(int w, int h)
  65 {
  66 }
  67
  68 static void
  69 draw(void)
  70 {
  71    vgClear(0, 0, window_width(), window_height());
  72    vgLoadIdentity();
  73    vgTranslate(50, 21);
  74    vgDrawPath(path, VG_FILL_PATH);
  75    vgFlush();
  76 }
  77
  78
  79 int main(int argc, char **argv)
  80 {
  81    set_window_size(100, 100);
  82    return run(argc, argv, init, reshape,
  83               draw, 0);
  84 }