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 "SkView.h" 10 #include "SkCanvas.h" 11 #include "SkGradientShader.h" 12 #include "SkGraphics.h" 13 #include "SkImageDecoder.h" 14 #include "SkPath.h" 15 #include "SkRandom.h" 16 #include "SkRegion.h" 17 #include "SkShader.h" 18 #include "SkUtils.h" 19 #include "SkXfermode.h" 20 #include "SkColorPriv.h" 21 #include "SkColorFilter.h" 22 #include "SkTime.h" 23 #include "SkTypeface.h" 24 25 #include "SkOSFile.h" 26 #include "SkStream.h" 27 28 static SkShader* make_shader0(SkIPoint* size) { 29 SkBitmap bm; 30 size->set(2, 2); 31 SkPMColor color0 = SkPreMultiplyARGB(0x80, 0x80, 0xff, 0x80); 32 SkPMColor color1 = SkPreMultiplyARGB(0x40, 0xff, 0x00, 0xff); 33 bm.allocN32Pixels(size->fX, size->fY); 34 bm.eraseColor(color0); 35 bm.lockPixels(); 36 uint32_t* pixels = (uint32_t*) bm.getPixels(); 37 pixels[0] = pixels[2] = color0; 38 pixels[1] = pixels[3] = color1; 39 bm.unlockPixels(); 40 41 return SkShader::CreateBitmapShader(bm, SkShader::kRepeat_TileMode, 42 SkShader::kRepeat_TileMode); 43 } 44 45 static SkShader* make_shader1(const SkIPoint& size) { 46 SkPoint pts[] = { { 0, 0 }, 47 { SkIntToScalar(size.fX), SkIntToScalar(size.fY) } }; 48 SkColor colors[] = { SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE, SK_ColorRED }; 49 return SkGradientShader::CreateLinear(pts, colors, nullptr, 50 SK_ARRAY_COUNT(colors), SkShader::kMirror_TileMode); 51 } 52 53 class VerticesView : public SampleView { 54 SkShader* fShader0; 55 SkShader* fShader1; 56 57 public: 58 VerticesView() { 59 SkIPoint size; 60 61 fShader0 = make_shader0(&size); 62 fShader1 = make_shader1(size); 63 64 make_strip(&fRecs[0], size.fX, size.fY); 65 make_fan(&fRecs[1], size.fX, size.fY); 66 make_tris(&fRecs[2]); 67 68 fScale = SK_Scalar1; 69 70 this->setBGColor(SK_ColorGRAY); 71 } 72 73 virtual ~VerticesView() { 74 SkSafeUnref(fShader0); 75 SkSafeUnref(fShader1); 76 } 77 78 protected: 79 // overrides from SkEventSink 80 bool onQuery(SkEvent* evt) override { 81 if (SampleCode::TitleQ(*evt)) { 82 SampleCode::TitleR(evt, "Vertices"); 83 return true; 84 } 85 return this->INHERITED::onQuery(evt); 86 } 87 88 SkScalar fScale; 89 90 void onDrawContent(SkCanvas* canvas) override { 91 SkPaint paint; 92 paint.setDither(true); 93 paint.setFilterQuality(kLow_SkFilterQuality); 94 95 for (size_t i = 0; i < SK_ARRAY_COUNT(fRecs); i++) { 96 canvas->save(); 97 98 paint.setShader(nullptr); 99 canvas->drawVertices(fRecs[i].fMode, fRecs[i].fCount, 100 fRecs[i].fVerts, fRecs[i].fTexs, 101 nullptr, nullptr, nullptr, 0, paint); 102 103 canvas->translate(SkIntToScalar(250), 0); 104 105 paint.setShader(fShader0); 106 canvas->drawVertices(fRecs[i].fMode, fRecs[i].fCount, 107 fRecs[i].fVerts, fRecs[i].fTexs, 108 nullptr, nullptr, nullptr, 0, paint); 109 110 canvas->translate(SkIntToScalar(250), 0); 111 112 paint.setShader(fShader1); 113 canvas->drawVertices(fRecs[i].fMode, fRecs[i].fCount, 114 fRecs[i].fVerts, fRecs[i].fTexs, 115 nullptr, nullptr, nullptr, 0, paint); 116 canvas->restore(); 117 118 canvas->translate(0, SkIntToScalar(250)); 119 } 120 } 121 122 SkView::Click* onFindClickHandler(SkScalar x, SkScalar y, unsigned) override { 123 return new Click(this); 124 } 125 126 bool onClick(Click* click) override { 127 // fCurrX = click->fICurr.fX; 128 // fCurrY = click->fICurr.fY; 129 this->inval(nullptr); 130 return true; 131 } 132 133 private: 134 struct Rec { 135 SkCanvas::VertexMode fMode; 136 int fCount; 137 SkPoint* fVerts; 138 SkPoint* fTexs; 139 140 Rec() : fCount(0), fVerts(nullptr), fTexs(nullptr) {} 141 ~Rec() { delete[] fVerts; delete[] fTexs; } 142 }; 143 144 void make_tris(Rec* rec) { 145 int n = 10; 146 SkRandom rand; 147 148 rec->fMode = SkCanvas::kTriangles_VertexMode; 149 rec->fCount = n * 3; 150 rec->fVerts = new SkPoint[rec->fCount]; 151 152 for (int i = 0; i < n; i++) { 153 SkPoint* v = &rec->fVerts[i*3]; 154 for (int j = 0; j < 3; j++) { 155 v[j].set(rand.nextUScalar1() * 250, rand.nextUScalar1() * 250); 156 } 157 } 158 } 159 160 void make_fan(Rec* rec, int texWidth, int texHeight) { 161 const SkScalar tx = SkIntToScalar(texWidth); 162 const SkScalar ty = SkIntToScalar(texHeight); 163 const int n = 24; 164 165 rec->fMode = SkCanvas::kTriangleFan_VertexMode; 166 rec->fCount = n + 2; 167 rec->fVerts = new SkPoint[rec->fCount]; 168 rec->fTexs = new SkPoint[rec->fCount]; 169 170 SkPoint* v = rec->fVerts; 171 SkPoint* t = rec->fTexs; 172 173 v[0].set(0, 0); 174 t[0].set(0, 0); 175 for (int i = 0; i < n; i++) { 176 SkScalar cos; 177 SkScalar sin = SkScalarSinCos(SK_ScalarPI * 2 * i / n, &cos); 178 v[i+1].set(cos, sin); 179 t[i+1].set(i*tx/n, ty); 180 } 181 v[n+1] = v[1]; 182 t[n+1].set(tx, ty); 183 184 SkMatrix m; 185 m.setScale(SkIntToScalar(100), SkIntToScalar(100)); 186 m.postTranslate(SkIntToScalar(110), SkIntToScalar(110)); 187 m.mapPoints(v, rec->fCount); 188 } 189 190 void make_strip(Rec* rec, int texWidth, int texHeight) { 191 const SkScalar tx = SkIntToScalar(texWidth); 192 const SkScalar ty = SkIntToScalar(texHeight); 193 const int n = 24; 194 195 rec->fMode = SkCanvas::kTriangleStrip_VertexMode; 196 rec->fCount = 2 * (n + 1); 197 rec->fVerts = new SkPoint[rec->fCount]; 198 rec->fTexs = new SkPoint[rec->fCount]; 199 200 SkPoint* v = rec->fVerts; 201 SkPoint* t = rec->fTexs; 202 203 for (int i = 0; i < n; i++) { 204 SkScalar cos; 205 SkScalar sin = SkScalarSinCos(SK_ScalarPI * 2 * i / n, &cos); 206 v[i*2 + 0].set(cos/2, sin/2); 207 v[i*2 + 1].set(cos, sin); 208 209 t[i*2 + 0].set(tx * i / n, ty); 210 t[i*2 + 1].set(tx * i / n, 0); 211 } 212 v[2*n + 0] = v[0]; 213 v[2*n + 1] = v[1]; 214 215 t[2*n + 0].set(tx, ty); 216 t[2*n + 1].set(tx, 0); 217 218 SkMatrix m; 219 m.setScale(SkIntToScalar(100), SkIntToScalar(100)); 220 m.postTranslate(SkIntToScalar(110), SkIntToScalar(110)); 221 m.mapPoints(v, rec->fCount); 222 } 223 224 Rec fRecs[3]; 225 226 typedef SampleView INHERITED; 227 }; 228 229 ////////////////////////////////////////////////////////////////////////////// 230 231 static SkView* MyFactory() { return new VerticesView; } 232 static SkViewRegister reg(MyFactory); 233
