| yangsu@google.com | 4c295a3 | 2011-06-01 16:11:58 +0000 | [diff] [blame] | 1 | #include "SampleCode.h" |
| 2 | #include "SkCanvas.h" |
| 3 | #include "SkGradientShader.h" |
| 4 | |
| 5 | class GradientView : public SampleView { |
| 6 | public: |
| 7 | GradientView() { |
| 8 | this->setBGColor(0xFFDDDDDD); |
| 9 | } |
| 10 | |
| 11 | protected: |
| 12 | struct GradData { |
| 13 | int fCount; |
| 14 | const SkColor* fColors; |
| 15 | const SkScalar* fPos; |
| 16 | }; |
| 17 | // overrides from SkEventSink |
| 18 | virtual bool onQuery(SkEvent* evt) { |
| 19 | if (SampleCode::TitleQ(*evt)) { |
| 20 | SampleCode::TitleR(evt, "Gradients"); |
| 21 | return true; |
| 22 | } |
| 23 | return this->INHERITED::onQuery(evt); |
| 24 | } |
| 25 | virtual void onDrawContent(SkCanvas* canvas) { |
| 26 | SkPaint paint; |
| 27 | paint.setAntiAlias(true); |
| 28 | paint.setStyle(SkPaint::kStroke_Style); |
| 29 | paint.setStrokeWidth(SkScalarHalf(SkIntToScalar(3))); |
| 30 | paint.setStyle(SkPaint::kFill_Style); |
| 31 | |
| 32 | SkPoint p = SkPoint::Make(0,0); |
| 33 | SkPoint q = SkPoint::Make(100,100); |
| 34 | SkPoint pts[] = {p, q}; |
| 35 | |
| 36 | SkScalar t, temp, x, y; |
| 37 | SkColor gColors[] = { |
| 38 | SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE, SK_ColorWHITE, SK_ColorBLACK |
| 39 | }; |
| 40 | t = SampleCode::GetAnimScalar(SkIntToScalar(2), SkIntToScalar(20)); |
| 41 | temp = SampleCode::GetAnimScalar(SkIntToScalar(1), SkIntToScalar(8)); |
| 42 | SkScalar step = SK_ScalarPI / (10); |
| 43 | SkScalar angle = t * step; |
| 44 | x = SkScalarSinCos(angle, &y); |
| 45 | SkScalar colorPositions[] = { 0, 0.1 + x, 0.4 + y, 0.9 - x + y, 1.0}; |
| 46 | GradData data = { 5, gColors, colorPositions }; |
| 47 | |
| 48 | |
| 49 | SkRect r = { 0, 0, SkIntToScalar(200), SkIntToScalar(200) }; |
| 50 | SkShader* shader1 = SkGradientShader::CreateLinear( |
| 51 | pts, data.fColors, data.fPos,data.fCount, |
| 52 | SkShader::kMirror_TileMode); |
| 53 | paint.setShader(shader1)->unref(); |
| 54 | |
| 55 | canvas->drawRect(r, paint); |
| 56 | |
| 57 | |
| 58 | SkPoint s = SkPoint::Make(100,100); |
| 59 | SkShader* shader2 = SkGradientShader::CreateRadial( |
| 60 | s, 100, data.fColors, data.fPos, data.fCount, |
| 61 | SkShader::kMirror_TileMode); |
| 62 | paint.setShader(shader2)->unref(); |
| 63 | canvas->translate(250, 0); |
| 64 | canvas->drawRect(r, paint); |
| 65 | |
| 66 | SkShader* shader3 = SkGradientShader::CreateTwoPointRadial( |
| 67 | p, 0, q, 100, data.fColors, data.fPos, data.fCount, |
| 68 | SkShader::kMirror_TileMode); |
| 69 | paint.setShader(shader3)->unref(); |
| 70 | canvas->translate(0, 250); |
| 71 | canvas->drawRect(r, paint); |
| 72 | |
| 73 | SkShader* shader4 = SkGradientShader::CreateSweep( |
| 74 | 100, 100, data.fColors, data.fPos, data.fCount); |
| 75 | |
| 76 | paint.setShader(shader4)->unref(); |
| 77 | canvas->translate(-250, 0); |
| 78 | canvas->drawRect(r, paint); |
| 79 | |
| 80 | this->inval(NULL); |
| 81 | } |
| 82 | |
| 83 | private: |
| 84 | typedef SampleView INHERITED; |
| 85 | }; |
| 86 | |
| 87 | ////////////////////////////////////////////////////////////////////////////// |
| 88 | |
| 89 | static SkView* MyFactory() { return new GradientView; } |
| 90 | static SkViewRegister reg(MyFactory); |