1 /* 2 * Copyright 2011 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 #include "SampleCode.h" 8 #include "SkView.h" 9 #include "SkCanvas.h" 10 #include "SkGradientShader.h" 11 #include "SkGraphics.h" 12 #include "SkPath.h" 13 #include "SkRandom.h" 14 #include "SkRegion.h" 15 #include "SkShader.h" 16 #include "SkUtils.h" 17 #include "SkColorPriv.h" 18 #include "SkColorFilter.h" 19 #include "SkTime.h" 20 #include "SkTypeface.h" 21 22 #include "SkOSFile.h" 23 #include "SkStream.h" 24 25 static sk_sp<SkShader> make_shader0(SkIPoint* size) { 26 SkBitmap bm; 27 size->set(2, 2); 28 SkPMColor color0 = SkPreMultiplyARGB(0x80, 0x80, 0xff, 0x80); 29 SkPMColor color1 = SkPreMultiplyARGB(0x40, 0xff, 0x00, 0xff); 30 bm.allocN32Pixels(size->fX, size->fY); 31 bm.eraseColor(color0); 32 bm.lockPixels(); 33 uint32_t* pixels = (uint32_t*) bm.getPixels(); 34 pixels[0] = pixels[2] = color0; 35 pixels[1] = pixels[3] = color1; 36 bm.unlockPixels(); 37 38 return SkShader::MakeBitmapShader(bm, SkShader::kRepeat_TileMode, SkShader::kRepeat_TileMode); 39 } 40 41 static sk_sp<SkShader> make_shader1(const SkIPoint& size) { 42 SkPoint pts[] = { { 0, 0 }, 43 { SkIntToScalar(size.fX), SkIntToScalar(size.fY) } }; 44 SkColor colors[] = { SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE, SK_ColorRED }; 45 return SkGradientShader::MakeLinear(pts, colors, nullptr, 46 SK_ARRAY_COUNT(colors), SkShader::kMirror_TileMode); 47 } 48 49 class VerticesView : public SampleView { 50 sk_sp<SkShader> fShader0; 51 sk_sp<SkShader> fShader1; 52 53 public: 54 VerticesView() { 55 SkIPoint size; 56 57 fShader0 = make_shader0(&size); 58 fShader1 = make_shader1(size); 59 60 make_strip(&fRecs[0], size.fX, size.fY); 61 make_fan(&fRecs[1], size.fX, size.fY); 62 make_tris(&fRecs[2]); 63 64 fScale = SK_Scalar1; 65 66 this->setBGColor(SK_ColorGRAY); 67 } 68 69 protected: 70 // overrides from SkEventSink 71 bool onQuery(SkEvent* evt) override { 72 if (SampleCode::TitleQ(*evt)) { 73 SampleCode::TitleR(evt, "Vertices"); 74 return true; 75 } 76 return this->INHERITED::onQuery(evt); 77 } 78 79 SkScalar fScale; 80 81 void onDrawContent(SkCanvas* canvas) override { 82 SkPaint paint; 83 paint.setDither(true); 84 paint.setFilterQuality(kLow_SkFilterQuality); 85 86 for (size_t i = 0; i < SK_ARRAY_COUNT(fRecs); i++) { 87 canvas->save(); 88 89 paint.setShader(nullptr); 90 canvas->drawVertices(fRecs[i].fMode, fRecs[i].fCount, 91 fRecs[i].fVerts, fRecs[i].fTexs, 92 nullptr, nullptr, 0, paint); 93 94 canvas->translate(SkIntToScalar(250), 0); 95 96 paint.setShader(fShader0); 97 canvas->drawVertices(fRecs[i].fMode, fRecs[i].fCount, 98 fRecs[i].fVerts, fRecs[i].fTexs, 99 nullptr, nullptr, 0, paint); 100 101 canvas->translate(SkIntToScalar(250), 0); 102 103 paint.setShader(fShader1); 104 canvas->drawVertices(fRecs[i].fMode, fRecs[i].fCount, 105 fRecs[i].fVerts, fRecs[i].fTexs, 106 nullptr, nullptr, 0, paint); 107 canvas->restore(); 108 109 canvas->translate(0, SkIntToScalar(250)); 110 } 111 } 112 113 SkView::Click* onFindClickHandler(SkScalar x, SkScalar y, unsigned) override { 114 return new Click(this); 115 } 116 117 bool onClick(Click* click) override { 118 // fCurrX = click->fICurr.fX; 119 // fCurrY = click->fICurr.fY; 120 this->inval(nullptr); 121 return true; 122 } 123 124 private: 125 struct Rec { 126 SkCanvas::VertexMode fMode; 127 int fCount; 128 SkPoint* fVerts; 129 SkPoint* fTexs; 130 131 Rec() : fCount(0), fVerts(nullptr), fTexs(nullptr) {} 132 ~Rec() { delete[] fVerts; delete[] fTexs; } 133 }; 134 135 void make_tris(Rec* rec) { 136 int n = 10; 137 SkRandom rand; 138 139 rec->fMode = SkCanvas::kTriangles_VertexMode; 140 rec->fCount = n * 3; 141 rec->fVerts = new SkPoint[rec->fCount]; 142 143 for (int i = 0; i < n; i++) { 144 SkPoint* v = &rec->fVerts[i*3]; 145 for (int j = 0; j < 3; j++) { 146 v[j].set(rand.nextUScalar1() * 250, rand.nextUScalar1() * 250); 147 } 148 } 149 } 150 151 void make_fan(Rec* rec, int texWidth, int texHeight) { 152 const SkScalar tx = SkIntToScalar(texWidth); 153 const SkScalar ty = SkIntToScalar(texHeight); 154 const int n = 24; 155 156 rec->fMode = SkCanvas::kTriangleFan_VertexMode; 157 rec->fCount = n + 2; 158 rec->fVerts = new SkPoint[rec->fCount]; 159 rec->fTexs = new SkPoint[rec->fCount]; 160 161 SkPoint* v = rec->fVerts; 162 SkPoint* t = rec->fTexs; 163 164 v[0].set(0, 0); 165 t[0].set(0, 0); 166 for (int i = 0; i < n; i++) { 167 SkScalar cos; 168 SkScalar sin = SkScalarSinCos(SK_ScalarPI * 2 * i / n, &cos); 169 v[i+1].set(cos, sin); 170 t[i+1].set(i*tx/n, ty); 171 } 172 v[n+1] = v[1]; 173 t[n+1].set(tx, ty); 174 175 SkMatrix m; 176 m.setScale(SkIntToScalar(100), SkIntToScalar(100)); 177 m.postTranslate(SkIntToScalar(110), SkIntToScalar(110)); 178 m.mapPoints(v, rec->fCount); 179 } 180 181 void make_strip(Rec* rec, int texWidth, int texHeight) { 182 const SkScalar tx = SkIntToScalar(texWidth); 183 const SkScalar ty = SkIntToScalar(texHeight); 184 const int n = 24; 185 186 rec->fMode = SkCanvas::kTriangleStrip_VertexMode; 187 rec->fCount = 2 * (n + 1); 188 rec->fVerts = new SkPoint[rec->fCount]; 189 rec->fTexs = new SkPoint[rec->fCount]; 190 191 SkPoint* v = rec->fVerts; 192 SkPoint* t = rec->fTexs; 193 194 for (int i = 0; i < n; i++) { 195 SkScalar cos; 196 SkScalar sin = SkScalarSinCos(SK_ScalarPI * 2 * i / n, &cos); 197 v[i*2 + 0].set(cos/2, sin/2); 198 v[i*2 + 1].set(cos, sin); 199 200 t[i*2 + 0].set(tx * i / n, ty); 201 t[i*2 + 1].set(tx * i / n, 0); 202 } 203 v[2*n + 0] = v[0]; 204 v[2*n + 1] = v[1]; 205 206 t[2*n + 0].set(tx, ty); 207 t[2*n + 1].set(tx, 0); 208 209 SkMatrix m; 210 m.setScale(SkIntToScalar(100), SkIntToScalar(100)); 211 m.postTranslate(SkIntToScalar(110), SkIntToScalar(110)); 212 m.mapPoints(v, rec->fCount); 213 } 214 215 Rec fRecs[3]; 216 217 typedef SampleView INHERITED; 218 }; 219 220 ////////////////////////////////////////////////////////////////////////////// 221 222 static SkView* MyFactory() { return new VerticesView; } 223 static SkViewRegister reg(MyFactory); 224
