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| 1 /* |
| 2 * Copyright 2015 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 "SampleCode.h" |
| 9 #include "SkAnimTimer.h" |
| 10 #include "SkCanvas.h" |
| 11 #include "SkGradientShader.h" |
| 12 #include "SkPatchUtils.h" |
| 13 #include "SkPerlinNoiseShader.h" |
| 14 #include "SkComposeShader.h" |
| 15 |
| 16 static void draw_control_points(SkCanvas* canvas, const SkPoint cubics[12]) { |
| 17 //draw control points |
| 18 SkPaint paint; |
| 19 SkPoint bottom[SkPatchUtils::kNumPtsCubic]; |
| 20 SkPatchUtils::getBottomCubic(cubics, bottom); |
| 21 SkPoint top[SkPatchUtils::kNumPtsCubic]; |
| 22 SkPatchUtils::getTopCubic(cubics, top); |
| 23 SkPoint left[SkPatchUtils::kNumPtsCubic]; |
| 24 SkPatchUtils::getLeftCubic(cubics, left); |
| 25 SkPoint right[SkPatchUtils::kNumPtsCubic]; |
| 26 SkPatchUtils::getRightCubic(cubics, right); |
| 27 |
| 28 paint.setColor(SK_ColorBLACK); |
| 29 paint.setStrokeWidth(0.5f); |
| 30 SkPoint corners[4] = { bottom[0], bottom[3], top[0], top[3] }; |
| 31 canvas->drawPoints(SkCanvas::kLines_PointMode, 4, bottom, paint); |
| 32 canvas->drawPoints(SkCanvas::kLines_PointMode, 2, bottom + 1, paint); |
| 33 canvas->drawPoints(SkCanvas::kLines_PointMode, 4, top, paint); |
| 34 canvas->drawPoints(SkCanvas::kLines_PointMode, 4, left, paint); |
| 35 canvas->drawPoints(SkCanvas::kLines_PointMode, 4, right, paint); |
| 36 |
| 37 canvas->drawPoints(SkCanvas::kLines_PointMode, 2, top + 1, paint); |
| 38 canvas->drawPoints(SkCanvas::kLines_PointMode, 2, left + 1, paint); |
| 39 canvas->drawPoints(SkCanvas::kLines_PointMode, 2, right + 1, paint); |
| 40 |
| 41 paint.setStrokeWidth(2); |
| 42 |
| 43 paint.setColor(SK_ColorRED); |
| 44 canvas->drawPoints(SkCanvas::kPoints_PointMode, 4, corners, paint); |
| 45 |
| 46 paint.setColor(SK_ColorBLUE); |
| 47 canvas->drawPoints(SkCanvas::kPoints_PointMode, 2, bottom + 1, paint); |
| 48 |
| 49 paint.setColor(SK_ColorCYAN); |
| 50 canvas->drawPoints(SkCanvas::kPoints_PointMode, 2, top + 1, paint); |
| 51 |
| 52 paint.setColor(SK_ColorYELLOW); |
| 53 canvas->drawPoints(SkCanvas::kPoints_PointMode, 2, left + 1, paint); |
| 54 |
| 55 paint.setColor(SK_ColorGREEN); |
| 56 canvas->drawPoints(SkCanvas::kPoints_PointMode, 2, right + 1, paint); |
| 57 } |
| 58 |
| 59 // These are actually half the total width and hieghts |
| 60 const SkScalar TexWidth = 100.0f; |
| 61 const SkScalar TexHeight = 100.0f; |
| 62 |
| 63 class PerlinPatchView : public SampleView { |
| 64 SkShader* fShader0; |
| 65 SkShader* fShader1; |
| 66 SkShader* fShaderCompose; |
| 67 SkScalar fXFreq; |
| 68 SkScalar fYFreq; |
| 69 SkScalar fSeed; |
| 70 SkPoint fPts[SkPatchUtils::kNumCtrlPts]; |
| 71 SkScalar fTexX; |
| 72 SkScalar fTexY; |
| 73 SkScalar fTexScale; |
| 74 SkMatrix fInvMatrix; |
| 75 public: |
| 76 PerlinPatchView() : fXFreq(0.025f), fYFreq(0.025f), fSeed(0.0f), |
| 77 fTexX(100.0), fTexY(50.0), fTexScale(1.0f) { |
| 78 // The order of the colors and points is clockwise starting at upper-lef
t corner. |
| 79 //top points |
| 80 fPts[0].set(100, 100); |
| 81 fPts[1].set(150, 50); |
| 82 fPts[2].set(250, 150); |
| 83 fPts[3].set(300, 100); |
| 84 //right points |
| 85 fPts[4].set(275, 150); |
| 86 fPts[5].set(350, 250); |
| 87 //bottom points |
| 88 fPts[6].set(300, 300); |
| 89 fPts[7].set(250, 250); |
| 90 //left points |
| 91 fPts[8].set(150, 350); |
| 92 fPts[9].set(100, 300); |
| 93 fPts[10].set(50, 250); |
| 94 fPts[11].set(150, 150); |
| 95 |
| 96 const SkColor colors[SkPatchUtils::kNumCorners] = { |
| 97 SK_ColorBLUE, SK_ColorYELLOW |
| 98 }; |
| 99 |
| 100 fShader0 = SkGradientShader::CreateRadial(SkPoint::Make(128.0f, 128.0f), |
| 101 180.0f, |
| 102 colors, |
| 103 NULL, |
| 104 2, |
| 105 SkShader::kMirror_TileMode, |
| 106 0, |
| 107 NULL); |
| 108 fShader1 = SkPerlinNoiseShader::CreateTurbulence(fXFreq, fYFreq, 2, fSee
d, NULL); |
| 109 fShaderCompose = new SkComposeShader(fShader0, fShader1); |
| 110 } |
| 111 |
| 112 virtual ~PerlinPatchView() { |
| 113 SkSafeUnref(fShader0); |
| 114 SkSafeUnref(fShader1); |
| 115 SkSafeUnref(fShaderCompose); |
| 116 } |
| 117 protected: |
| 118 // overrides from SkEventSink |
| 119 bool onQuery(SkEvent* evt) override { |
| 120 if (SampleCode::TitleQ(*evt)) { |
| 121 SampleCode::TitleR(evt, "PerlinPatch"); |
| 122 return true; |
| 123 } |
| 124 return this->INHERITED::onQuery(evt); |
| 125 } |
| 126 |
| 127 bool onAnimate(const SkAnimTimer& timer) override { |
| 128 return true; |
| 129 } |
| 130 |
| 131 |
| 132 void onDrawContent(SkCanvas* canvas) override { |
| 133 if (!canvas->getTotalMatrix().invert(&fInvMatrix)) { |
| 134 return; |
| 135 } |
| 136 |
| 137 SkPaint paint; |
| 138 |
| 139 SkScalar texWidth = fTexScale * TexWidth; |
| 140 SkScalar texHeight = fTexScale * TexHeight; |
| 141 const SkPoint texCoords[SkPatchUtils::kNumCorners] = { |
| 142 { fTexX - texWidth, fTexY - texHeight}, |
| 143 { fTexX + texWidth, fTexY - texHeight}, |
| 144 { fTexX + texWidth, fTexY + texHeight}, |
| 145 { fTexX - texWidth, fTexY + texHeight}} |
| 146 ; |
| 147 |
| 148 SkAutoTUnref<SkXfermode> xfer(SkXfermode::Create(SkXfermode::kSrc_Mode))
; |
| 149 |
| 150 paint.setShader(fShaderCompose); |
| 151 canvas->drawPatch(fPts, nullptr, texCoords, xfer, paint); |
| 152 |
| 153 draw_control_points(canvas, fPts); |
| 154 } |
| 155 |
| 156 class PtClick : public Click { |
| 157 public: |
| 158 int fIndex; |
| 159 PtClick(SkView* view, int index) : Click(view), fIndex(index) {} |
| 160 }; |
| 161 |
| 162 static bool hittest(const SkPoint& pt, SkScalar x, SkScalar y) { |
| 163 return SkPoint::Length(pt.fX - x, pt.fY - y) < SkIntToScalar(5); |
| 164 } |
| 165 |
| 166 SkView::Click* onFindClickHandler(SkScalar x, SkScalar y, unsigned modi) ove
rride { |
| 167 // holding down shift |
| 168 if (1 == modi) { |
| 169 return new PtClick(this, -1); |
| 170 } |
| 171 // holding down ctrl |
| 172 if (2 == modi) { |
| 173 return new PtClick(this, -2); |
| 174 } |
| 175 SkPoint clickPoint = {x, y}; |
| 176 fInvMatrix.mapPoints(&clickPoint, 1); |
| 177 for (size_t i = 0; i < SK_ARRAY_COUNT(fPts); i++) { |
| 178 if (hittest(fPts[i], clickPoint.fX, clickPoint.fY)) { |
| 179 return new PtClick(this, (int)i); |
| 180 } |
| 181 } |
| 182 return this->INHERITED::onFindClickHandler(x, y, modi); |
| 183 } |
| 184 |
| 185 bool onClick(Click* click) override { |
| 186 PtClick* ptClick = (PtClick*)click; |
| 187 if (ptClick->fIndex >= 0) { |
| 188 fPts[ptClick->fIndex].set(click->fCurr.fX , click->fCurr.fY ); |
| 189 } else if (-1 == ptClick->fIndex) { |
| 190 SkScalar xDiff = click->fPrev.fX - click->fCurr.fX; |
| 191 SkScalar yDiff = click->fPrev.fY - click->fCurr.fY; |
| 192 fTexX += xDiff * fTexScale; |
| 193 fTexY += yDiff * fTexScale; |
| 194 } else if (-2 == ptClick->fIndex) { |
| 195 SkScalar yDiff = click->fCurr.fY - click->fPrev.fY; |
| 196 fTexScale += yDiff / 10.0f; |
| 197 fTexScale = SkTMax(0.1f, SkTMin(20.f, fTexScale)); |
| 198 } |
| 199 this->inval(nullptr); |
| 200 return true; |
| 201 } |
| 202 |
| 203 private: |
| 204 typedef SampleView INHERITED; |
| 205 }; |
| 206 |
| 207 DEF_SAMPLE( return new PerlinPatchView(); ) |
| 208 |
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