submodule/skia/docs/examples/radial_gradient_shader_with_animated_color.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_ANIMATED(radial_gradient_shader_with_animated_color, 256, 256, false, 0, 2) {
   5 void draw(SkCanvas* canvas) {
   6     float p = 0.5 * (1 - cos(6.28318548f * frame));
   7     SkColor blue = SkColor(0xff * p) | 0xFF000000;
   8     SkColor colors[2] = {blue, SK_ColorYELLOW};
   9     SkPaint paint;
  10     paint.setShader(SkGradientShader::MakeRadial(
  11                 SkPoint::Make(128.0f, 128.0f), 180.0f,
  12                 colors, nullptr, 2, SkTileMode::kClamp, 0, nullptr));
  13     canvas->drawPaint(paint);
  14 }
  15 }  // END FIDDLE