1 2 /* 3 * Copyright 2011 Google Inc. 4 * 5 * Use of this source code is governed by a BSD-style license that can be 6 * found in the LICENSE file. 7 */ 8 #include "SampleCode.h" 9 #include "SkBlurMask.h" 10 #include "SkBlurMaskFilter.h" 11 #include "SkCanvas.h" 12 #include "SkDevice.h" 13 #include "SkGradientShader.h" 14 #include "SkGraphics.h" 15 #include "SkImageDecoder.h" 16 #include "SkPath.h" 17 #include "SkRandom.h" 18 #include "SkRegion.h" 19 #include "SkShader.h" 20 #include "SkUtils.h" 21 #include "SkXfermode.h" 22 #include "SkColorPriv.h" 23 #include "SkColorFilter.h" 24 #include "SkTime.h" 25 #include "SkTypeface.h" 26 #include "SkView.h" 27 28 #include "SkOSFile.h" 29 #include "SkStream.h" 30 31 class TextAlphaView : public SampleView { 32 public: 33 TextAlphaView() { 34 fByte = 0xFF; 35 } 36 37 protected: 38 // overrides from SkEventSink 39 virtual bool onQuery(SkEvent* evt) { 40 if (SampleCode::TitleQ(*evt)) { 41 SampleCode::TitleR(evt, "TextAlpha"); 42 return true; 43 } 44 return this->INHERITED::onQuery(evt); 45 } 46 47 virtual void onDrawContent(SkCanvas* canvas) { 48 const char* str = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"; 49 SkPaint paint; 50 SkScalar x = SkIntToScalar(10); 51 SkScalar y = SkIntToScalar(20); 52 53 paint.setFlags(0x105); 54 55 paint.setARGB(fByte, 0xFF, 0xFF, 0xFF); 56 57 paint.setMaskFilter(SkBlurMaskFilter::Create(kNormal_SkBlurStyle, 58 SkBlurMask::ConvertRadiusToSigma(SkIntToScalar(3)))); 59 paint.getMaskFilter()->unref(); 60 61 SkRandom rand; 62 63 for (int ps = 6; ps <= 35; ps++) { 64 paint.setColor(rand.nextU() | (0xFF << 24)); 65 paint.setTextSize(SkIntToScalar(ps)); 66 paint.setTextSize(SkIntToScalar(24)); 67 canvas->drawText(str, strlen(str), x, y, paint); 68 y += paint.getFontMetrics(NULL); 69 } 70 } 71 72 virtual SkView::Click* onFindClickHandler(SkScalar x, SkScalar y, unsigned) SK_OVERRIDE { 73 return new Click(this); 74 } 75 76 virtual bool onClick(Click* click) { 77 int y = click->fICurr.fY; 78 if (y < 0) { 79 y = 0; 80 } else if (y > 255) { 81 y = 255; 82 } 83 fByte = y; 84 this->inval(NULL); 85 return true; 86 } 87 88 private: 89 int fByte; 90 91 typedef SampleView INHERITED; 92 }; 93 94 ////////////////////////////////////////////////////////////////////////////// 95 96 static SkView* MyFactory() { return new TextAlphaView; } 97 static SkViewRegister reg(MyFactory); 98