70 lines
2.0 KiB
C++
70 lines
2.0 KiB
C++
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/*
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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 "include/core/SkCanvas.h"
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#include "include/core/SkPath.h"
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#include "tools/viewer/ClickHandlerSlide.h"
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// Reproduces https://code.google.com/p/chromium/issues/detail?id=279014
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// Renders a string art shape.
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// The particular shape rendered can be controlled by clicking horizontally, thereby
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// generating an angle from 0 to 1.
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class StringArtSlide : public ClickHandlerSlide {
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public:
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StringArtSlide() : fAngle(0.305f) { fName = "StringArt"; }
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void load(SkScalar w, SkScalar h) override { fSize = {w, h}; }
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void resize(SkScalar w, SkScalar h) override { fSize = {w, h}; }
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void draw(SkCanvas* canvas) override {
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SkScalar angle = fAngle*SK_ScalarPI + SkScalarHalf(SK_ScalarPI);
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SkPoint center = SkPoint::Make(fSize.width()/2, fSize.height()/2);
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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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while (length < (std::min(fSize.width(), fSize.height())/2 - 10.f))
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{
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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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path.close();
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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(0xFF007700);
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canvas->drawPath(path, paint);
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}
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protected:
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Click* onFindClickHandler(SkScalar x, SkScalar y, skui::ModifierKey) override {
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fAngle = x/fSize.width();
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return nullptr;
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}
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bool onClick(ClickHandlerSlide::Click *) override { return false; }
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private:
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SkScalar fAngle;
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SkSize fSize;
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};
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//////////////////////////////////////////////////////////////////////////////
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DEF_SLIDE( return new StringArtSlide(); )
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