docs/examples/Shader_Methods_a.cpp

// Copyright 2019 Google LLC
// Use of this source code is governed by a BSD-style license that can be found in the LICENSE file.
#include "tools/fiddle/examples.h"
REG_FIDDLE(Shader_Methods_a, 256, 256, false, 0) {
void draw(SkCanvas* canvas) {
   SkPaint paint;
   SkPoint center = { 50, 50 };
   SkScalar radius = 50;
   const SkColor4f colors[] = { {1,1,1,1}, {0,0,0,0} };
   paint.setShader(SkShaders::RadialGradient(center, radius,
                                             {{colors, {}, SkTileMode::kClamp}, {}}));
   for (SkScalar a : { 0.3f, 0.6f, 1.0f } ) {
       paint.setAlpha((int) (a * 255));
       canvas->drawCircle(center.fX, center.fY, radius, paint);
       canvas->translate(70, 70);
   }
}
}  // END FIDDLE