1 /* 2 * Copyright 2013 Google Inc. 3 * 4 * Use of this source code is governed by a BSD-style license that can be 5 * found in the LICENSE file. 6 */ 7 8 #include "include/core/SkCanvas.h" 9 #include "include/core/SkPath.h" 10 #include "samplecode/Sample.h" 11 12 // Reproduces https://code.google.com/p/chromium/issues/detail?id=279014 13 14 // Renders a string art shape. 15 // The particular shape rendered can be controlled by clicking horizontally, thereby 16 // generating an angle from 0 to 1. 17 18 class StringArtView : public Sample { 19 public: StringArtView()20 StringArtView() : fAngle(0.305f) {} 21 22 protected: name()23 SkString name() override { return SkString("StringArt"); } 24 onDrawContent(SkCanvas * canvas)25 void onDrawContent(SkCanvas* canvas) override { 26 SkScalar angle = fAngle*SK_ScalarPI + SkScalarHalf(SK_ScalarPI); 27 28 SkPoint center = SkPoint::Make(SkScalarHalf(this->width()), SkScalarHalf(this->height())); 29 SkScalar length = 5; 30 SkScalar step = angle; 31 32 SkPath path; 33 path.moveTo(center); 34 35 while (length < (SkScalarHalf(std::min(this->width(), this->height())) - 10.f)) 36 { 37 SkPoint rp = SkPoint::Make(length*SkScalarCos(step) + center.fX, 38 length*SkScalarSin(step) + center.fY); 39 path.lineTo(rp); 40 length += angle / SkScalarHalf(SK_ScalarPI); 41 step += angle; 42 } 43 path.close(); 44 45 SkPaint paint; 46 paint.setAntiAlias(true); 47 paint.setStyle(SkPaint::kStroke_Style); 48 paint.setColor(0xFF007700); 49 50 canvas->drawPath(path, paint); 51 } 52 onFindClickHandler(SkScalar x,SkScalar y,skui::ModifierKey)53 Sample::Click* onFindClickHandler(SkScalar x, SkScalar y, skui::ModifierKey) override { 54 fAngle = x/width(); 55 return nullptr; 56 } 57 private: 58 59 SkScalar fAngle; 60 using INHERITED = Sample; 61 }; 62 63 ////////////////////////////////////////////////////////////////////////////// 64 65 DEF_SAMPLE( return new StringArtView(); ) 66