Path_IsCubicDegenerate.cpp 876 B

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  1. // Copyright 2019 Google LLC.
  2. // Use of this source code is governed by a BSD-style license that can be found in the LICENSE file.
  3. #include "tools/fiddle/examples.h"
  4. // HASH=6b97099acdae80b16df0c4241f593991
  5. REG_FIDDLE(Path_IsCubicDegenerate, 256, 256, true, 0) {
  6. void draw(SkCanvas* canvas) {
  7. SkPoint points[] = {{1, 0}, {0, 0}, {0, 0}, {0, 0}};
  8. SkScalar step = 1;
  9. SkScalar prior, length = 0, degenerate = 0;
  10. do {
  11. prior = points[0].fX;
  12. step /= 2;
  13. if (SkPath::IsCubicDegenerate(points[0], points[1], points[2], points[3], false)) {
  14. degenerate = prior;
  15. points[0].fX += step;
  16. } else {
  17. length = prior;
  18. points[0].fX -= step;
  19. }
  20. } while (prior != points[0].fX);
  21. SkDebugf("%1.8g is degenerate\n", degenerate);
  22. SkDebugf("%1.8g is length\n", length);
  23. }
  24. } // END FIDDLE