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 8 #include "include/core/SkCanvas.h" 9 #include "include/core/SkFontMetrics.h" 10 #include "include/core/SkGraphics.h" 11 #include "include/core/SkPath.h" 12 #include "include/core/SkString.h" 13 #include "include/core/SkTime.h" 14 #include "include/utils/SkRandom.h" 15 #include "include/utils/SkTextUtils.h" 16 #include "samplecode/Sample.h" 17 18 class PolyToPolyView : public Sample { 19 public: PolyToPolyView()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 } 68 } 69 } 70 71 protected: name()72 virtual SkString name() { return SkString("PolyToPolyView"); } 73 doDraw(SkCanvas * canvas,SkPaint * paint,const SkFont & font,const int isrc[],const int idst[],int count)74 static void doDraw(SkCanvas* canvas, SkPaint* paint, const SkFont& font, const int isrc[], 75 const int idst[], int count) { 76 SkMatrix matrix; 77 SkPoint src[4], dst[4]; 78 79 for (int i = 0; i < count; i++) { 80 src[i].set(SkIntToScalar(isrc[2*i+0]), SkIntToScalar(isrc[2*i+1])); 81 dst[i].set(SkIntToScalar(idst[2*i+0]), SkIntToScalar(idst[2*i+1])); 82 } 83 84 canvas->save(); 85 matrix.setPolyToPoly(src, dst, count); 86 canvas->concat(matrix); 87 88 paint->setColor(SK_ColorGRAY); 89 paint->setStyle(SkPaint::kStroke_Style); 90 const SkScalar D = SkIntToScalar(64); 91 canvas->drawRect(SkRect::MakeWH(D, D), *paint); 92 canvas->drawLine(0, 0, D, D, *paint); 93 canvas->drawLine(0, D, D, 0, *paint); 94 95 SkFontMetrics fm; 96 font.getMetrics(&fm); 97 paint->setColor(SK_ColorRED); 98 paint->setStyle(SkPaint::kFill_Style); 99 SkScalar x = D/2; 100 float y = D/2 - (fm.fAscent + fm.fDescent)/2; 101 SkString str; 102 str.appendS32(count); 103 SkTextUtils::DrawString(canvas, str.c_str(), x, y, font, *paint, SkTextUtils::kCenter_Align); 104 105 canvas->restore(); 106 } 107 onDrawContent(SkCanvas * canvas)108 virtual void onDrawContent(SkCanvas* canvas) { 109 SkPaint paint; 110 paint.setAntiAlias(true); 111 paint.setStrokeWidth(SkIntToScalar(4)); 112 113 SkFont font; 114 font.setSize(40); 115 116 canvas->save(); 117 canvas->translate(SkIntToScalar(10), SkIntToScalar(10)); 118 // translate (1 point) 119 const int src1[] = { 0, 0 }; 120 const int dst1[] = { 5, 5 }; 121 doDraw(canvas, &paint, font, src1, dst1, 1); 122 canvas->restore(); 123 124 canvas->save(); 125 canvas->translate(SkIntToScalar(160), SkIntToScalar(10)); 126 // rotate/uniform-scale (2 points) 127 const int src2[] = { 32, 32, 64, 32 }; 128 const int dst2[] = { 32, 32, 64, 48 }; 129 doDraw(canvas, &paint, font, src2, dst2, 2); 130 canvas->restore(); 131 132 canvas->save(); 133 canvas->translate(SkIntToScalar(10), SkIntToScalar(110)); 134 // rotate/skew (3 points) 135 const int src3[] = { 0, 0, 64, 0, 0, 64 }; 136 const int dst3[] = { 0, 0, 96, 0, 24, 64 }; 137 doDraw(canvas, &paint, font, src3, dst3, 3); 138 canvas->restore(); 139 140 canvas->save(); 141 canvas->translate(SkIntToScalar(160), SkIntToScalar(110)); 142 // perspective (4 points) 143 const int src4[] = { 0, 0, 64, 0, 64, 64, 0, 64 }; 144 const int dst4[] = { 0, 0, 96, 0, 64, 96, 0, 64 }; 145 doDraw(canvas, &paint, font, src4, dst4, 4); 146 canvas->restore(); 147 } 148 149 private: 150 typedef Sample INHERITED; 151 }; 152 153 ////////////////////////////////////////////////////////////////////////////// 154 155 DEF_SAMPLE( return new PolyToPolyView(); ) 156