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71 lines
2.0 KiB
71 lines
2.0 KiB
/* |
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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 "Sample.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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// 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 StringArtView : public Sample { |
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public: |
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StringArtView() : fAngle(0.305f) {} |
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protected: |
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bool onQuery(Sample::Event* evt) override { |
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if (Sample::TitleQ(*evt)) { |
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Sample::TitleR(evt, "StringArt"); |
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return true; |
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} |
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return this->INHERITED::onQuery(evt); |
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} |
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void onDrawContent(SkCanvas* canvas) override { |
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SkScalar angle = fAngle*SK_ScalarPI + SkScalarHalf(SK_ScalarPI); |
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SkPoint center = SkPoint::Make(SkScalarHalf(this->width()), SkScalarHalf(this->height())); |
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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 < (SkScalarHalf(SkMinScalar(this->width(), this->height())) - 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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Sample::Click* onFindClickHandler(SkScalar x, SkScalar y, unsigned) override { |
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fAngle = x/width(); |
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return nullptr; |
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} |
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private: |
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SkScalar fAngle; |
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typedef Sample INHERITED; |
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}; |
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////////////////////////////////////////////////////////////////////////////// |
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DEF_SAMPLE( return new StringArtView(); )
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