102 lines
2.6 KiB
C++
102 lines
2.6 KiB
C++
/*
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* Copyright 2014 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#include "gm/gm.h"
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#include "include/core/SkCanvas.h"
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#include "include/core/SkPaint.h"
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#include "include/core/SkPathBuilder.h"
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#include "include/core/SkScalar.h"
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#include "include/core/SkSize.h"
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#include "include/core/SkString.h"
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#include "include/utils/SkRandom.h"
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#define W 400
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#define H 400
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#define N 10
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constexpr SkScalar SH = SkIntToScalar(H);
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static SkPath rnd_quad(SkPaint* paint, SkRandom& rand) {
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auto a = rand.nextRangeScalar(0,W),
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b = rand.nextRangeScalar(0,H);
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SkPathBuilder builder;
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builder.moveTo(a, b);
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for (int x = 0; x < 2; ++x) {
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auto c = rand.nextRangeScalar(W/4, W),
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d = rand.nextRangeScalar( 0, H),
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e = rand.nextRangeScalar( 0, W),
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f = rand.nextRangeScalar(H/4, H);
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builder.quadTo(c,d,e,f);
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}
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paint->setColor(rand.nextU());
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SkScalar width = rand.nextRangeScalar(1, 5);
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width *= width;
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paint->setStrokeWidth(width);
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paint->setAlphaf(1.0f);
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return builder.detach();
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}
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static SkPath rnd_cubic(SkPaint* paint, SkRandom& rand) {
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auto a = rand.nextRangeScalar(0,W),
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b = rand.nextRangeScalar(0,H);
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SkPathBuilder builder;
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builder.moveTo(a, b);
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for (int x = 0; x < 2; ++x) {
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auto c = rand.nextRangeScalar(W/4, W),
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d = rand.nextRangeScalar( 0, H),
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e = rand.nextRangeScalar( 0, W),
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f = rand.nextRangeScalar(H/4, H),
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g = rand.nextRangeScalar(W/4, W),
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h = rand.nextRangeScalar(H/4, H);
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builder.cubicTo(c,d,e,f,g,h);
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}
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paint->setColor(rand.nextU());
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SkScalar width = rand.nextRangeScalar(1, 5);
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width *= width;
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paint->setStrokeWidth(width);
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paint->setAlphaf(1.0f);
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return builder.detach();
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}
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class BeziersGM : public skiagm::GM {
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public:
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BeziersGM() {}
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protected:
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SkString onShortName() override {
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return SkString("beziers");
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}
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SkISize onISize() override {
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return SkISize::Make(W, H*2);
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}
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void onDraw(SkCanvas* canvas) override {
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SkPaint paint;
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paint.setStyle(SkPaint::kStroke_Style);
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paint.setStrokeWidth(SkIntToScalar(9)/2);
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paint.setAntiAlias(true);
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SkRandom rand;
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for (int i = 0; i < N; i++) {
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canvas->drawPath(rnd_quad(&paint, rand), paint);
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}
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canvas->translate(0, SH);
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for (int i = 0; i < N; i++) {
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canvas->drawPath(rnd_cubic(&paint, rand), paint);
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}
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}
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private:
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using INHERITED = skiagm::GM;
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};
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DEF_GM( return new BeziersGM; )
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