submodule/skia/docs/examples/compose_path.cpp

   1 // Copyright 2020 Google LLC.
   2 // Use of this source code is governed by a BSD-style license that can be found in the LICENSE file.
   3 #include "tools/fiddle/examples.h"
   4 REG_FIDDLE(compose_path, 256, 256, false, 0) {
   5 SkPath star() {
   6     const SkScalar R = 115.2f, C = 128.0f;
   7     SkPath path;
   8     path.moveTo(C + R, C);
   9     for (int i = 1; i < 8; ++i) {
  10         SkScalar a = 2.6927937f * i;
  11         path.lineTo(C + R * cos(a), C + R * sin(a));
  12     }
  13     return path;
  14 }
  15 void draw(SkCanvas* canvas) {
  16     const SkScalar intervals[] = {10.0f, 5.0f, 2.0f, 5.0f};
  17     size_t count = sizeof(intervals) / sizeof(intervals[0]);
  18     SkPaint paint;
  19     paint.setPathEffect(
  20             SkPathEffect::MakeCompose(SkDashPathEffect::Make(intervals, count, 0.0f),
  21                                       SkDiscretePathEffect::Make(10.0f, 4.0f)));
  22     paint.setStyle(SkPaint::kStroke_Style);
  23     paint.setStrokeWidth(2.0f);
  24     paint.setAntiAlias(true);
  25     paint.setColor(0xff4285F4);
  26     canvas->clear(SK_ColorWHITE);
  27     SkPath path(star());
  28     canvas->drawPath(path, paint);
  29 }
  30 }  // END FIDDLE