SamplePolyToPoly.cpp 5.0 KB

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  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. #include "include/core/SkCanvas.h"
  8. #include "include/core/SkFontMetrics.h"
  9. #include "include/core/SkGraphics.h"
  10. #include "include/core/SkPath.h"
  11. #include "include/core/SkString.h"
  12. #include "include/core/SkTime.h"
  13. #include "include/utils/SkRandom.h"
  14. #include "include/utils/SkTextUtils.h"
  15. #include "samplecode/Sample.h"
  16. class PolyToPolyView : public Sample {
  17. public:
  18. PolyToPolyView() {
  19. // tests
  20. {
  21. SkPoint src[] = { { 0, 0 },
  22. { SK_Scalar1, 0 },
  23. { 0, SK_Scalar1 } };
  24. SkPoint dst[] = { { 0, 0 },
  25. { 2*SK_Scalar1, 0 },
  26. { 0, 2*SK_Scalar1 } };
  27. SkMatrix m1, m2;
  28. (void) m1.setPolyToPoly(src, dst, 3);
  29. m2.reset();
  30. m2.set(SkMatrix::kMScaleX, dst[1].fX - dst[0].fX);
  31. m2.set(SkMatrix::kMSkewX, dst[2].fX - dst[0].fX);
  32. m2.set(SkMatrix::kMTransX, dst[0].fX);
  33. m2.set(SkMatrix::kMSkewY, dst[1].fY - dst[0].fY);
  34. m2.set(SkMatrix::kMScaleY, dst[2].fY - dst[0].fY);
  35. m2.set(SkMatrix::kMTransY, dst[0].fY);
  36. m1.reset();
  37. const SkScalar src1[] = {
  38. 0, 0, 0, 427, 316, 427, 316, 0
  39. };
  40. const SkScalar dst1[] = {
  41. 158, 177.5f, 158, 249.5f,
  42. 158, 604.5f, 158, -177.5f
  43. };
  44. (void) m2.setPolyToPoly((const SkPoint*)src1, (SkPoint*)dst1, 4);
  45. {
  46. const SkPoint src[] = {
  47. { SkIntToScalar(1), SkIntToScalar(0) },
  48. { SkIntToScalar(4), SkIntToScalar(7) },
  49. { SkIntToScalar(10), SkIntToScalar(2) }
  50. };
  51. const SkPoint dst[] = {
  52. { SkIntToScalar(4), SkIntToScalar(2) },
  53. { SkIntToScalar(45), SkIntToScalar(26) },
  54. { SkIntToScalar(32), SkIntToScalar(17) }
  55. };
  56. SkMatrix m0;
  57. m0.setPolyToPoly(src, dst, 3);
  58. }
  59. }
  60. }
  61. protected:
  62. virtual SkString name() { return SkString("PolyToPolyView"); }
  63. static void doDraw(SkCanvas* canvas, SkPaint* paint, const SkFont& font, const int isrc[],
  64. const int idst[], int count) {
  65. SkMatrix matrix;
  66. SkPoint src[4], dst[4];
  67. for (int i = 0; i < count; i++) {
  68. src[i].set(SkIntToScalar(isrc[2*i+0]), SkIntToScalar(isrc[2*i+1]));
  69. dst[i].set(SkIntToScalar(idst[2*i+0]), SkIntToScalar(idst[2*i+1]));
  70. }
  71. canvas->save();
  72. matrix.setPolyToPoly(src, dst, count);
  73. canvas->concat(matrix);
  74. paint->setColor(SK_ColorGRAY);
  75. paint->setStyle(SkPaint::kStroke_Style);
  76. const SkScalar D = SkIntToScalar(64);
  77. canvas->drawRect(SkRect::MakeWH(D, D), *paint);
  78. canvas->drawLine(0, 0, D, D, *paint);
  79. canvas->drawLine(0, D, D, 0, *paint);
  80. SkFontMetrics fm;
  81. font.getMetrics(&fm);
  82. paint->setColor(SK_ColorRED);
  83. paint->setStyle(SkPaint::kFill_Style);
  84. SkScalar x = D/2;
  85. float y = D/2 - (fm.fAscent + fm.fDescent)/2;
  86. SkString str;
  87. str.appendS32(count);
  88. SkTextUtils::DrawString(canvas, str.c_str(), x, y, font, *paint, SkTextUtils::kCenter_Align);
  89. canvas->restore();
  90. }
  91. virtual void onDrawContent(SkCanvas* canvas) {
  92. SkPaint paint;
  93. paint.setAntiAlias(true);
  94. paint.setStrokeWidth(SkIntToScalar(4));
  95. SkFont font;
  96. font.setSize(40);
  97. canvas->save();
  98. canvas->translate(SkIntToScalar(10), SkIntToScalar(10));
  99. // translate (1 point)
  100. const int src1[] = { 0, 0 };
  101. const int dst1[] = { 5, 5 };
  102. doDraw(canvas, &paint, font, src1, dst1, 1);
  103. canvas->restore();
  104. canvas->save();
  105. canvas->translate(SkIntToScalar(160), SkIntToScalar(10));
  106. // rotate/uniform-scale (2 points)
  107. const int src2[] = { 32, 32, 64, 32 };
  108. const int dst2[] = { 32, 32, 64, 48 };
  109. doDraw(canvas, &paint, font, src2, dst2, 2);
  110. canvas->restore();
  111. canvas->save();
  112. canvas->translate(SkIntToScalar(10), SkIntToScalar(110));
  113. // rotate/skew (3 points)
  114. const int src3[] = { 0, 0, 64, 0, 0, 64 };
  115. const int dst3[] = { 0, 0, 96, 0, 24, 64 };
  116. doDraw(canvas, &paint, font, src3, dst3, 3);
  117. canvas->restore();
  118. canvas->save();
  119. canvas->translate(SkIntToScalar(160), SkIntToScalar(110));
  120. // perspective (4 points)
  121. const int src4[] = { 0, 0, 64, 0, 64, 64, 0, 64 };
  122. const int dst4[] = { 0, 0, 96, 0, 64, 96, 0, 64 };
  123. doDraw(canvas, &paint, font, src4, dst4, 4);
  124. canvas->restore();
  125. }
  126. private:
  127. typedef Sample INHERITED;
  128. };
  129. //////////////////////////////////////////////////////////////////////////////
  130. DEF_SAMPLE( return new PolyToPolyView(); )