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 "SkGraphics.h" 12 #include "SkPath.h" 13 #include "SkRandom.h" 14 #include "SkTime.h" 15 16 extern bool SkSetPoly3To3(SkMatrix* matrix, const SkPoint src[3], const SkPoint dst[3]); 17 18 class PolyToPolyView : public SampleView { 19 public: 20 PolyToPolyView() { 21 // tests 22 { 23 SkPoint src[] = { { 0, 0 }, 24 { SK_Scalar1, 0 }, 25 { 0, SK_Scalar1 } }; 26 SkPoint dst[] = { { 0, 0 }, 27 { 2*SK_Scalar1, 0 }, 28 { 0, 2*SK_Scalar1 } }; 29 SkMatrix m1, m2; 30 31 (void) m1.setPolyToPoly(src, dst, 3); 32 33 m2.reset(); 34 m2.set(SkMatrix::kMScaleX, dst[1].fX - dst[0].fX); 35 m2.set(SkMatrix::kMSkewX, dst[2].fX - dst[0].fX); 36 m2.set(SkMatrix::kMTransX, dst[0].fX); 37 m2.set(SkMatrix::kMSkewY, dst[1].fY - dst[0].fY); 38 m2.set(SkMatrix::kMScaleY, dst[2].fY - dst[0].fY); 39 m2.set(SkMatrix::kMTransY, dst[0].fY); 40 41 m1.reset(); 42 43 const SkScalar src1[] = { 44 0, 0, 0, 427, 316, 427, 316, 0 45 }; 46 const SkScalar dst1[] = { 47 158, 177.5f, 158, 249.5f, 48 158, 604.5f, 158, -177.5f 49 }; 50 51 (void) m2.setPolyToPoly((const SkPoint*)src1, (SkPoint*)dst1, 4); 52 53 { 54 const SkPoint src[] = { 55 { SkIntToScalar(1), SkIntToScalar(0) }, 56 { SkIntToScalar(4), SkIntToScalar(7) }, 57 { SkIntToScalar(10), SkIntToScalar(2) } 58 }; 59 const SkPoint dst[] = { 60 { SkIntToScalar(4), SkIntToScalar(2) }, 61 { SkIntToScalar(45), SkIntToScalar(26) }, 62 { SkIntToScalar(32), SkIntToScalar(17) } 63 }; 64 65 SkMatrix m0; 66 m0.setPolyToPoly(src, dst, 3); 67 // SkMatrix m1; 68 // SkSetPoly3To3(&m1, src, dst); 69 // m0.dump(); 70 // m1.dump(); 71 } 72 } 73 } 74 75 protected: 76 // overrides from SkEventSink 77 virtual bool onQuery(SkEvent* evt) { 78 if (SampleCode::TitleQ(*evt)) { 79 SampleCode::TitleR(evt, "PolyToPolyView"); 80 return true; 81 } 82 return this->INHERITED::onQuery(evt); 83 } 84 85 static void doDraw(SkCanvas* canvas, SkPaint* paint, const int isrc[], 86 const int idst[], int count) { 87 SkMatrix matrix; 88 SkPoint src[4], dst[4]; 89 90 for (int i = 0; i < count; i++) { 91 src[i].set(SkIntToScalar(isrc[2*i+0]), SkIntToScalar(isrc[2*i+1])); 92 dst[i].set(SkIntToScalar(idst[2*i+0]), SkIntToScalar(idst[2*i+1])); 93 } 94 95 canvas->save(); 96 matrix.setPolyToPoly(src, dst, count); 97 canvas->concat(matrix); 98 99 paint->setColor(SK_ColorGRAY); 100 paint->setStyle(SkPaint::kStroke_Style); 101 const SkScalar D = SkIntToScalar(64); 102 canvas->drawRectCoords(0, 0, D, D, *paint); 103 canvas->drawLine(0, 0, D, D, *paint); 104 canvas->drawLine(0, D, D, 0, *paint); 105 106 SkPaint::FontMetrics fm; 107 paint->getFontMetrics(&fm); 108 paint->setColor(SK_ColorRED); 109 paint->setStyle(SkPaint::kFill_Style); 110 SkScalar x = D/2; 111 float y = D/2 - (fm.fAscent + fm.fDescent)/2; 112 SkString str; 113 str.appendS32(count); 114 canvas->drawText(str.c_str(), str.size(), 115 x, y, 116 *paint); 117 118 canvas->restore(); 119 } 120 121 virtual void onDrawContent(SkCanvas* canvas) { 122 SkPaint paint; 123 paint.setAntiAlias(true); 124 paint.setStrokeWidth(SkIntToScalar(4)); 125 paint.setTextSize(SkIntToScalar(40)); 126 paint.setTextAlign(SkPaint::kCenter_Align); 127 128 canvas->save(); 129 canvas->translate(SkIntToScalar(10), SkIntToScalar(10)); 130 // translate (1 point) 131 const int src1[] = { 0, 0 }; 132 const int dst1[] = { 5, 5 }; 133 doDraw(canvas, &paint, src1, dst1, 1); 134 canvas->restore(); 135 136 canvas->save(); 137 canvas->translate(SkIntToScalar(160), SkIntToScalar(10)); 138 // rotate/uniform-scale (2 points) 139 const int src2[] = { 32, 32, 64, 32 }; 140 const int dst2[] = { 32, 32, 64, 48 }; 141 doDraw(canvas, &paint, src2, dst2, 2); 142 canvas->restore(); 143 144 canvas->save(); 145 canvas->translate(SkIntToScalar(10), SkIntToScalar(110)); 146 // rotate/skew (3 points) 147 const int src3[] = { 0, 0, 64, 0, 0, 64 }; 148 const int dst3[] = { 0, 0, 96, 0, 24, 64 }; 149 doDraw(canvas, &paint, src3, dst3, 3); 150 canvas->restore(); 151 152 canvas->save(); 153 canvas->translate(SkIntToScalar(160), SkIntToScalar(110)); 154 // perspective (4 points) 155 const int src4[] = { 0, 0, 64, 0, 64, 64, 0, 64 }; 156 const int dst4[] = { 0, 0, 96, 0, 64, 96, 0, 64 }; 157 doDraw(canvas, &paint, src4, dst4, 4); 158 canvas->restore(); 159 } 160 161 private: 162 typedef SampleView INHERITED; 163 }; 164 165 ////////////////////////////////////////////////////////////////////////////// 166 167 static SkView* MyFactory() { return new PolyToPolyView; } 168 static SkViewRegister reg(MyFactory); 169
