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 9 #include "SampleCode.h" 10 #include "SkView.h" 11 #include "SkCanvas.h" 12 #include "SkGradientShader.h" 13 #include "SkGraphics.h" 14 #include "SkImageDecoder.h" 15 #include "SkPath.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 "SkParsePath.h" 23 #include "SkTime.h" 24 #include "SkTypeface.h" 25 26 #include "SkGeometry.h" 27 28 // http://code.google.com/p/skia/issues/detail?id=32 29 static void test_cubic() { 30 SkPoint src[4] = { 31 { 556.25000f, 523.03003f }, 32 { 556.23999f, 522.96002f }, 33 { 556.21997f, 522.89001f }, 34 { 556.21997f, 522.82001f } 35 }; 36 SkPoint dst[11]; 37 dst[10].set(42, -42); // one past the end, that we don't clobber these 38 SkScalar tval[] = { 0.33333334f, 0.99999994f }; 39 40 SkChopCubicAt(src, dst, tval, 2); 41 42 #if 0 43 for (int i = 0; i < 11; i++) { 44 SkDebugf("--- %d [%g %g]\n", i, dst[i].fX, dst[i].fY); 45 } 46 #endif 47 } 48 49 static void test_cubic2() { 50 const char* str = "M2242 -590088L-377758 9.94099e+07L-377758 9.94099e+07L2242 -590088Z"; 51 SkPath path; 52 SkParsePath::FromSVGString(str, &path); 53 54 { 55 #ifdef SK_BUILD_FOR_WIN 56 // windows doesn't have strtof 57 float x = (float)strtod("9.94099e+07", NULL); 58 #else 59 float x = strtof("9.94099e+07", NULL); 60 #endif 61 int ix = (int)x; 62 int fx = (int)(x * 65536); 63 int ffx = SkScalarToFixed(x); 64 printf("%g %x %x %x\n", x, ix, fx, ffx); 65 66 SkRect r = path.getBounds(); 67 SkIRect ir; 68 r.round(&ir); 69 printf("[%g %g %g %g] [%x %x %x %x]\n", 70 SkScalarToDouble(r.fLeft), SkScalarToDouble(r.fTop), 71 SkScalarToDouble(r.fRight), SkScalarToDouble(r.fBottom), 72 ir.fLeft, ir.fTop, ir.fRight, ir.fBottom); 73 } 74 75 SkBitmap bitmap; 76 bitmap.setConfig(SkBitmap::kARGB_8888_Config, 300, 200); 77 bitmap.allocPixels(); 78 79 SkCanvas canvas(bitmap); 80 SkPaint paint; 81 paint.setAntiAlias(true); 82 canvas.drawPath(path, paint); 83 } 84 85 class PathView : public SampleView { 86 public: 87 int fDStroke, fStroke, fMinStroke, fMaxStroke; 88 SkPath fPath[6]; 89 bool fShowHairline; 90 91 PathView() { 92 test_cubic(); 93 test_cubic2(); 94 95 fShowHairline = false; 96 97 fDStroke = 1; 98 fStroke = 10; 99 fMinStroke = 10; 100 fMaxStroke = 180; 101 102 const int V = 85; 103 104 fPath[0].moveTo(SkIntToScalar(40), SkIntToScalar(70)); 105 fPath[0].lineTo(SkIntToScalar(70), SkIntToScalar(70) + SK_Scalar1/1); 106 fPath[0].lineTo(SkIntToScalar(110), SkIntToScalar(70)); 107 108 fPath[1].moveTo(SkIntToScalar(40), SkIntToScalar(70)); 109 fPath[1].lineTo(SkIntToScalar(70), SkIntToScalar(70) - SK_Scalar1/1); 110 fPath[1].lineTo(SkIntToScalar(110), SkIntToScalar(70)); 111 112 fPath[2].moveTo(SkIntToScalar(V), SkIntToScalar(V)); 113 fPath[2].lineTo(SkIntToScalar(50), SkIntToScalar(V)); 114 fPath[2].lineTo(SkIntToScalar(50), SkIntToScalar(50)); 115 116 fPath[3].moveTo(SkIntToScalar(50), SkIntToScalar(50)); 117 fPath[3].lineTo(SkIntToScalar(50), SkIntToScalar(V)); 118 fPath[3].lineTo(SkIntToScalar(V), SkIntToScalar(V)); 119 120 fPath[4].moveTo(SkIntToScalar(50), SkIntToScalar(50)); 121 fPath[4].lineTo(SkIntToScalar(50), SkIntToScalar(V)); 122 fPath[4].lineTo(SkIntToScalar(52), SkIntToScalar(50)); 123 124 fPath[5].moveTo(SkIntToScalar(52), SkIntToScalar(50)); 125 fPath[5].lineTo(SkIntToScalar(50), SkIntToScalar(V)); 126 fPath[5].lineTo(SkIntToScalar(50), SkIntToScalar(50)); 127 128 this->setBGColor(0xFFDDDDDD); 129 } 130 131 void nextStroke() { 132 fStroke += fDStroke; 133 if (fStroke > fMaxStroke || fStroke < fMinStroke) 134 fDStroke = -fDStroke; 135 } 136 137 protected: 138 // overrides from SkEventSink 139 virtual bool onQuery(SkEvent* evt) { 140 if (SampleCode::TitleQ(*evt)) { 141 SampleCode::TitleR(evt, "Paths"); 142 return true; 143 } 144 return this->INHERITED::onQuery(evt); 145 } 146 147 void drawPath(SkCanvas* canvas, const SkPath& path, SkPaint::Join j) { 148 SkPaint paint; 149 150 paint.setAntiAlias(true); 151 paint.setStyle(SkPaint::kStroke_Style); 152 paint.setStrokeJoin(j); 153 paint.setStrokeWidth(SkIntToScalar(fStroke)); 154 155 if (fShowHairline) { 156 SkPath fill; 157 158 paint.getFillPath(path, &fill); 159 paint.setStrokeWidth(0); 160 canvas->drawPath(fill, paint); 161 } else { 162 canvas->drawPath(path, paint); 163 } 164 165 paint.setColor(SK_ColorRED); 166 paint.setStrokeWidth(0); 167 canvas->drawPath(path, paint); 168 } 169 170 virtual void onDrawContent(SkCanvas* canvas) { 171 canvas->translate(SkIntToScalar(50), SkIntToScalar(50)); 172 173 static const SkPaint::Join gJoins[] = { 174 SkPaint::kBevel_Join, 175 SkPaint::kMiter_Join, 176 SkPaint::kRound_Join 177 }; 178 179 for (size_t i = 0; i < SK_ARRAY_COUNT(gJoins); i++) { 180 canvas->save(); 181 for (size_t j = 0; j < SK_ARRAY_COUNT(fPath); j++) { 182 this->drawPath(canvas, fPath[j], gJoins[i]); 183 canvas->translate(SkIntToScalar(200), 0); 184 } 185 canvas->restore(); 186 187 canvas->translate(0, SkIntToScalar(200)); 188 } 189 190 this->nextStroke(); 191 this->inval(NULL); 192 } 193 194 virtual SkView::Click* onFindClickHandler(SkScalar x, SkScalar y) { 195 fShowHairline = !fShowHairline; 196 this->inval(NULL); 197 return this->INHERITED::onFindClickHandler(x, y); 198 } 199 200 private: 201 typedef SampleView INHERITED; 202 }; 203 204 ////////////////////////////////////////////////////////////////////////////// 205 206 static SkView* MyFactory() { return new PathView; } 207 static SkViewRegister reg(MyFactory); 208 209
