xref: /third_party/skia/docs/examples/shader.cpp (revision cb93a386)
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"
4REG_FIDDLE(shader, 256, 256, false, 0) {
5SkPath star() {
6    const SkScalar R = 60.0f, C = 128.0f;
7    SkPath path;
8    path.moveTo(C + R, C);
9    for (int i = 1; i < 15; ++i) {
10        SkScalar a = 0.44879895f * i;
11        SkScalar r = R + R * (i % 2);
12        path.lineTo(C + r * cos(a), C + r * sin(a));
13    }
14    return path;
15}
16void draw(SkCanvas* canvas) {
17    SkPaint paint;
18    paint.setPathEffect(SkDiscretePathEffect::Make(10.0f, 4.0f));
19    SkPoint points[2] = {SkPoint::Make(0.0f, 0.0f), SkPoint::Make(256.0f, 256.0f)};
20    SkColor colors[2] = {SkColorSetRGB(66, 133, 244), SkColorSetRGB(15, 157, 88)};
21    paint.setShader(
22            SkGradientShader::MakeLinear(points, colors, NULL, 2, SkTileMode::kClamp, 0, NULL));
23    paint.setAntiAlias(true);
24    canvas->clear(SK_ColorWHITE);
25    SkPath path(star());
26    canvas->drawPath(path, paint);
27}
28}  // END FIDDLE
29