Canvas_drawTextRSXform.cpp 974 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=935c8f8b9782d297a73d7186f6ef7945
  5. REG_FIDDLE(Canvas_drawTextRSXform, 256, 256, false, 0) {
  6. void draw(SkCanvas* canvas) {
  7. const int iterations = 26;
  8. SkRSXform transforms[iterations];
  9. char alphabet[iterations];
  10. SkScalar angle = 0;
  11. SkScalar scale = 1;
  12. for (size_t i = 0; i < SK_ARRAY_COUNT(transforms); ++i) {
  13. const SkScalar s = SkScalarSin(angle) * scale;
  14. const SkScalar c = SkScalarCos(angle) * scale;
  15. transforms[i] = SkRSXform::Make(-c, -s, -s * 16, c * 16);
  16. angle += .45f;
  17. scale += .2f;
  18. alphabet[i] = 'A' + i;
  19. }
  20. SkPaint paint;
  21. SkFont font(nullptr, 20);
  22. auto spiral = SkTextBlob::MakeFromRSXform(alphabet, sizeof(alphabet), transforms, font);
  23. canvas->drawTextBlob(spiral, 110, 138, paint);
  24. }
  25. } // END FIDDLE