skia2/docs/examples/shader.cpp
Hal Canary 6c8422c671 add more docs/examples from named fiddles.
ignore offscreen, srgb, and animated fiddles for now.

Change-Id: I923131b684865698e6cda138b004930e11f504d5
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/263713
Commit-Queue: Hal Canary <halcanary@google.com>
Reviewed-by: Ben Wagner <bungeman@google.com>
2020-01-14 19:22:26 +00:00

29 lines
1.0 KiB
C++

// Copyright 2020 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, 256, 256, false, 0) {
SkPath star() {
const SkScalar R = 60.0f, C = 128.0f;
SkPath path;
path.moveTo(C + R, C);
for (int i = 1; i < 15; ++i) {
SkScalar a = 0.44879895f * i;
SkScalar r = R + R * (i % 2);
path.lineTo(C + r * cos(a), C + r * sin(a));
}
return path;
}
void draw(SkCanvas* canvas) {
SkPaint paint;
paint.setPathEffect(SkDiscretePathEffect::Make(10.0f, 4.0f));
SkPoint points[2] = {SkPoint::Make(0.0f, 0.0f), SkPoint::Make(256.0f, 256.0f)};
SkColor colors[2] = {SkColorSetRGB(66, 133, 244), SkColorSetRGB(15, 157, 88)};
paint.setShader(
SkGradientShader::MakeLinear(points, colors, NULL, 2, SkTileMode::kClamp, 0, NULL));
paint.setAntiAlias(true);
canvas->clear(SK_ColorWHITE);
SkPath path(star());
canvas->drawPath(path, paint);
}
} // END FIDDLE