progs/egl/openvg/trivial/vguarc.c

   1 #include "eglcommon.h"
   2
   3 #include <VG/openvg.h>
   4 #include <VG/vgu.h>
   5
   6 const VGfloat white_color[4] = {1.0, 1.0, 1.0, 1.0};
   7 const VGfloat color[4] = {0.4, 0.1, 1.0, 1.0};
   8
   9 VGPath path;
  10 VGPaint paint;
  11
  12
  13 static void
  14 init(void)
  15 {
  16     VGfloat clearColor[] = {0.0f, 0.0f, 0.0f, 1.0f};/* black color */
  17     VGfloat greenColor[] = {0.0f, 1.0f, 0.0f, 1.0f};/* green color */
  18     VGint arcType = VGU_ARC_OPEN;
  19     VGfloat x, y, w, h, startAngle, angleExtent;
  20
  21     x = 150;
  22     y = 150;
  23     w = 150;
  24     h = 150;
  25 #if 0
  26     startAngle  = -540.0f;
  27     angleExtent = 270.0f;
  28 #else
  29     startAngle  = 270.0f;
  30     angleExtent = 90.0f;
  31 #endif
  32
  33     paint = vgCreatePaint();
  34
  35     vgSetPaint(paint, VG_STROKE_PATH);
  36     vgSetParameterfv(paint, VG_PAINT_COLOR, 4, greenColor);
  37     vgSetParameteri( paint, VG_PAINT_TYPE, VG_PAINT_TYPE_COLOR);
  38     vgSetf(VG_STROKE_LINE_WIDTH, 6.0f);
  39     vgSeti(VG_RENDERING_QUALITY, VG_RENDERING_QUALITY_NONANTIALIASED);
  40     vgSetfv(VG_CLEAR_COLOR, 4, clearColor);
  41
  42     path  = vgCreatePath(VG_PATH_FORMAT_STANDARD, VG_PATH_DATATYPE_F,
  43                          1.0f, 0.0f, 0, 0, VG_PATH_CAPABILITY_ALL);
  44
  45     vguArc(path, x, y, w, h, startAngle, angleExtent, arcType);
  46
  47     vgSeti(VG_STROKE_CAP_STYLE, VG_CAP_BUTT);
  48     vgSeti(VG_STROKE_JOIN_STYLE, VG_JOIN_BEVEL);
  49     vgSetf(VG_STROKE_MITER_LIMIT, 4.0f);
  50 }
  51
  52 /* new window size or exposure */
  53 static void
  54 reshape(int w, int h)
  55 {
  56    vgLoadIdentity();
  57 }
  58
  59 static void
  60 draw(void)
  61 {
  62    vgClear(0, 0, window_width(), window_height());
  63    vgDrawPath(path, VG_STROKE_PATH);
  64
  65    vgFlush();
  66 }
  67
  68
  69 int main(int argc, char **argv)
  70 {
  71     // set_window_size(64, 63);
  72    return run(argc, argv, init, reshape,
  73               draw, 0);
  74 }