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 bm.setConfig(SkBitmap::kARGB_8888_Config, size->fX, size->fY); 32 SkPMColor color0 = SkPreMultiplyARGB(0x80, 0x80, 0xff, 0x80); 33 SkPMColor color1 = SkPreMultiplyARGB(0x40, 0xff, 0x00, 0xff); 34 bm.allocPixels(); 35 bm.eraseColor(color0); 36 bm.lockPixels(); 37 uint32_t* pixels = (uint32_t*) bm.getPixels(); 38 pixels[0] = pixels[2] = color0; 39 pixels[1] = pixels[3] = color1; 40 bm.unlockPixels(); 41 42 return SkShader::CreateBitmapShader(bm, SkShader::kRepeat_TileMode, 43 SkShader::kRepeat_TileMode); 44 } 45 46 static SkShader* make_shader1(const SkIPoint& size) { 47 SkPoint pts[] = { { 0, 0 }, 48 { SkIntToScalar(size.fX), SkIntToScalar(size.fY) } }; 49 SkColor colors[] = { SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE, SK_ColorRED }; 50 return SkGradientShader::CreateLinear(pts, colors, NULL, 51 SK_ARRAY_COUNT(colors), SkShader::kMirror_TileMode, NULL); 52 } 53 54 class VerticesView : public SampleView { 55 SkShader* fShader0; 56 SkShader* fShader1; 57 58 public: 59 VerticesView() { 60 SkIPoint size; 61 62 fShader0 = make_shader0(&size); 63 fShader1 = make_shader1(size); 64 65 make_strip(&fRecs[0], size.fX, size.fY); 66 make_fan(&fRecs[1], size.fX, size.fY); 67 make_tris(&fRecs[2]); 68 69 fScale = SK_Scalar1; 70 71 this->setBGColor(SK_ColorGRAY); 72 } 73 74 virtual ~VerticesView() { 75 SkSafeUnref(fShader0); 76 SkSafeUnref(fShader1); 77 } 78 79 protected: 80 // overrides from SkEventSink 81 virtual bool onQuery(SkEvent* evt) { 82 if (SampleCode::TitleQ(*evt)) 83 { 84 SkString str("Vertices"); 85 SampleCode::TitleR(evt, str.c_str()); 86 return true; 87 } 88 return this->INHERITED::onQuery(evt); 89 } 90 91 SkScalar fScale; 92 93 virtual void onDrawContent(SkCanvas* canvas) { 94 SkPaint paint; 95 paint.setDither(true); 96 paint.setFilterBitmap(true); 97 98 for (size_t i = 0; i < SK_ARRAY_COUNT(fRecs); i++) { 99 canvas->save(); 100 101 paint.setShader(NULL); 102 canvas->drawVertices(fRecs[i].fMode, fRecs[i].fCount, 103 fRecs[i].fVerts, fRecs[i].fTexs, 104 NULL, NULL, NULL, 0, paint); 105 106 canvas->translate(SkIntToScalar(250), 0); 107 108 paint.setShader(fShader0); 109 canvas->drawVertices(fRecs[i].fMode, fRecs[i].fCount, 110 fRecs[i].fVerts, fRecs[i].fTexs, 111 NULL, NULL, NULL, 0, paint); 112 113 canvas->translate(SkIntToScalar(250), 0); 114 115 paint.setShader(fShader1); 116 canvas->drawVertices(fRecs[i].fMode, fRecs[i].fCount, 117 fRecs[i].fVerts, fRecs[i].fTexs, 118 NULL, NULL, NULL, 0, paint); 119 canvas->restore(); 120 121 canvas->translate(0, SkIntToScalar(250)); 122 } 123 } 124 125 virtual SkView::Click* onFindClickHandler(SkScalar x, SkScalar y) { 126 return new Click(this); 127 } 128 129 virtual bool onClick(Click* click) { 130 // fCurrX = click->fICurr.fX; 131 // fCurrY = click->fICurr.fY; 132 this->inval(NULL); 133 return true; 134 } 135 136 private: 137 struct Rec { 138 SkCanvas::VertexMode fMode; 139 int fCount; 140 SkPoint* fVerts; 141 SkPoint* fTexs; 142 143 Rec() : fCount(0), fVerts(NULL), fTexs(NULL) {} 144 ~Rec() { delete[] fVerts; delete[] fTexs; } 145 }; 146 147 void make_tris(Rec* rec) { 148 int n = 10; 149 SkRandom rand; 150 151 rec->fMode = SkCanvas::kTriangles_VertexMode; 152 rec->fCount = n * 3; 153 rec->fVerts = new SkPoint[rec->fCount]; 154 155 for (int i = 0; i < n; i++) { 156 SkPoint* v = &rec->fVerts[i*3]; 157 for (int j = 0; j < 3; j++) { 158 v[j].set(rand.nextUScalar1() * 250, rand.nextUScalar1() * 250); 159 } 160 } 161 } 162 163 void make_fan(Rec* rec, int texWidth, int texHeight) { 164 const SkScalar tx = SkIntToScalar(texWidth); 165 const SkScalar ty = SkIntToScalar(texHeight); 166 const int n = 24; 167 168 rec->fMode = SkCanvas::kTriangleFan_VertexMode; 169 rec->fCount = n + 2; 170 rec->fVerts = new SkPoint[rec->fCount]; 171 rec->fTexs = new SkPoint[rec->fCount]; 172 173 SkPoint* v = rec->fVerts; 174 SkPoint* t = rec->fTexs; 175 176 v[0].set(0, 0); 177 t[0].set(0, 0); 178 for (int i = 0; i < n; i++) { 179 SkScalar cos; 180 SkScalar sin = SkScalarSinCos(SK_ScalarPI * 2 * i / n, &cos); 181 v[i+1].set(cos, sin); 182 t[i+1].set(i*tx/n, ty); 183 } 184 v[n+1] = v[1]; 185 t[n+1].set(tx, ty); 186 187 SkMatrix m; 188 m.setScale(SkIntToScalar(100), SkIntToScalar(100)); 189 m.postTranslate(SkIntToScalar(110), SkIntToScalar(110)); 190 m.mapPoints(v, rec->fCount); 191 } 192 193 void make_strip(Rec* rec, int texWidth, int texHeight) { 194 const SkScalar tx = SkIntToScalar(texWidth); 195 const SkScalar ty = SkIntToScalar(texHeight); 196 const int n = 24; 197 198 rec->fMode = SkCanvas::kTriangleStrip_VertexMode; 199 rec->fCount = 2 * (n + 1); 200 rec->fVerts = new SkPoint[rec->fCount]; 201 rec->fTexs = new SkPoint[rec->fCount]; 202 203 SkPoint* v = rec->fVerts; 204 SkPoint* t = rec->fTexs; 205 206 for (int i = 0; i < n; i++) { 207 SkScalar cos; 208 SkScalar sin = SkScalarSinCos(SK_ScalarPI * 2 * i / n, &cos); 209 v[i*2 + 0].set(cos/2, sin/2); 210 v[i*2 + 1].set(cos, sin); 211 212 t[i*2 + 0].set(tx * i / n, ty); 213 t[i*2 + 1].set(tx * i / n, 0); 214 } 215 v[2*n + 0] = v[0]; 216 v[2*n + 1] = v[1]; 217 218 t[2*n + 0].set(tx, ty); 219 t[2*n + 1].set(tx, 0); 220 221 SkMatrix m; 222 m.setScale(SkIntToScalar(100), SkIntToScalar(100)); 223 m.postTranslate(SkIntToScalar(110), SkIntToScalar(110)); 224 m.mapPoints(v, rec->fCount); 225 } 226 227 Rec fRecs[3]; 228 229 typedef SampleView INHERITED; 230 }; 231 232 ////////////////////////////////////////////////////////////////////////////// 233 234 static SkView* MyFactory() { return new VerticesView; } 235 static SkViewRegister reg(MyFactory); 236 237
