33d2055e59
gm.h includes sk_tool_utils.h but does not use it. The bulk of this CL makes each gm that uses sk_tool_utils include it. sk_tool_utils.h also provided SkRandom and SkTDArray, so a couple GMs add those headers too. Change-Id: Ieb2a7c542f0ca89c3223f744fc11b0ff37af36c1 Reviewed-on: https://skia-review.googlesource.com/10014 Commit-Queue: Mike Klein <mtklein@chromium.org> Reviewed-by: Herb Derby <herb@google.com>
86 lines
2.4 KiB
C++
86 lines
2.4 KiB
C++
/*
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* Copyright 2013 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.h"
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#include "sk_tool_utils.h"
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#include "SkAnimTimer.h"
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#include "SkCanvas.h"
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#include "SkPath.h"
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// Reproduces https://code.google.com/p/chromium/issues/detail?id=279014
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constexpr int kWidth = 440;
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constexpr int kHeight = 440;
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constexpr SkScalar kAngle = 0.305f;
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constexpr int kMaxNumSteps = 140;
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// Renders a string art shape.
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// The particular shape rendered can be controlled by adjusting kAngle, from 0 to 1
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class StringArtGM : public skiagm::GM {
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public:
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StringArtGM() : fNumSteps(kMaxNumSteps) {}
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protected:
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SkString onShortName() override {
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return SkString("stringart");
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}
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SkISize onISize() override {
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return SkISize::Make(kWidth, kHeight);
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}
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void onDraw(SkCanvas* canvas) override {
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SkScalar angle = kAngle*SK_ScalarPI + SkScalarHalf(SK_ScalarPI);
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SkScalar size = SkIntToScalar(SkMin32(kWidth, kHeight));
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SkPoint center = SkPoint::Make(SkScalarHalf(kWidth), SkScalarHalf(kHeight));
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SkScalar length = 5;
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SkScalar step = angle;
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SkPath path;
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path.moveTo(center);
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for (int i = 0; i < fNumSteps && length < (SkScalarHalf(size) - 10.f); ++i) {
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SkPoint rp = SkPoint::Make(length*SkScalarCos(step) + center.fX,
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length*SkScalarSin(step) + center.fY);
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path.lineTo(rp);
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length += angle / SkScalarHalf(SK_ScalarPI);
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step += angle;
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}
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SkPaint paint;
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paint.setAntiAlias(true);
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paint.setStyle(SkPaint::kStroke_Style);
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paint.setColor(sk_tool_utils::color_to_565(0xFF007700));
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canvas->drawPath(path, paint);
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}
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bool onAnimate(const SkAnimTimer& timer) override {
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constexpr SkScalar kDesiredDurationSecs = 3.0f;
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// Make the animation ping-pong back and forth but start in the fully drawn state
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SkScalar fraction = 1.0f - timer.scaled(2.0f/kDesiredDurationSecs, 2.0f);
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if (fraction <= 0.0f) {
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fraction = -fraction;
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}
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SkASSERT(fraction >= 0.0f && fraction <= 1.0f);
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fNumSteps = (int) (fraction * kMaxNumSteps);
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return true;
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}
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private:
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int fNumSteps;
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typedef GM INHERITED;
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};
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DEF_GM( return new StringArtGM; )
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