progs/openvg/trivial/dash.c

   1 #include "eglcommon.h"
   2
   3 #include <VG/openvg.h>
   4 #include <X11/keysym.h>
   5 #include <stdio.h>
   6
   7 const VGfloat white_color[4] = {1.0, 1.0, 1.0, 1.0};
   8 const VGfloat color[4] = {0.4, 0.1, 1.0, 1.0};
   9
  10 VGPath path;
  11 VGPaint fill;
  12
  13 VGint cap_style = VG_CAP_BUTT;
  14
  15 static void
  16 init(void)
  17 {
  18    static const VGubyte cmds[] = {VG_MOVE_TO_ABS,
  19                                   VG_LINE_TO_ABS,
  20                                   VG_LINE_TO_ABS
  21    };
  22 #if 1
  23    static const VGfloat coords[]   = {100, 100, 150, 100,
  24                                       150, 200
  25    };
  26 #else
  27    static const VGfloat coords[]   = {100, 20, 100, 220,
  28    };
  29 #endif
  30    VGfloat dash_pattern[2] = { 20.f, 20.f };
  31    path = vgCreatePath(VG_PATH_FORMAT_STANDARD, VG_PATH_DATATYPE_F, 1, 0, 0, 0,
  32                        VG_PATH_CAPABILITY_APPEND_TO);
  33    vgAppendPathData(path, 3, cmds, coords);
  34
  35    fill = vgCreatePaint();
  36    vgSetParameterfv(fill, VG_PAINT_COLOR, 4, color);
  37    vgSetPaint(fill, VG_FILL_PATH);
  38
  39    vgSetfv(VG_CLEAR_COLOR, 4, white_color);
  40    vgSetf(VG_STROKE_LINE_WIDTH, 20);
  41    vgSeti(VG_STROKE_CAP_STYLE, cap_style);
  42    vgSeti(VG_STROKE_JOIN_STYLE, VG_JOIN_ROUND);
  43    vgSetfv(VG_STROKE_DASH_PATTERN, 2, dash_pattern);
  44    vgSetf(VG_STROKE_DASH_PHASE, 0.0f);
  45 }
  46
  47 /* new window size or exposure */
  48 static void
  49 reshape(int w, int h)
  50 {
  51    vgLoadIdentity();
  52 }
  53
  54 static void
  55 draw(void)
  56 {
  57    vgClear(0, 0, window_width(), window_height());
  58    vgDrawPath(path, VG_STROKE_PATH);
  59
  60    vgFlush();
  61 }
  62
  63 static int  key_press(unsigned key)
  64 {
  65     switch(key) {
  66     case XK_c:
  67     case XK_C:
  68         ++cap_style;
  69         if (cap_style > VG_CAP_SQUARE)
  70             cap_style = VG_CAP_BUTT;
  71         switch(cap_style) {
  72         case VG_CAP_BUTT:
  73             fprintf(stderr, "Cap style 'butt'\n");
  74             break;
  75         case VG_CAP_ROUND:
  76             fprintf(stderr, "Cap style 'round'\n");
  77             break;
  78         case VG_CAP_SQUARE:
  79             fprintf(stderr, "Cap style 'square'\n");
  80             break;
  81         }
  82         vgSeti(VG_STROKE_CAP_STYLE, cap_style);
  83         break;
  84     default:
  85         break;
  86     }
  87
  88     return VG_TRUE;
  89 }
  90
  91 int main(int argc, char **argv)
  92 {
  93    return run(argc, argv, init, reshape,
  94               draw, key_press);
  95 }