Matrix_mapXY_2.cpp 833 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=b1ead09c67a177ab8eace12b061610a7
  5. REG_FIDDLE(Matrix_mapXY_2, 256, 256, false, 4) {
  6. void draw(SkCanvas* canvas) {
  7. SkMatrix matrix;
  8. SkPoint bitmapBounds[4], perspect[4] = {{50, 10}, {180, 40}, {236, 176}, {30, 206}};
  9. SkRect::Make(source.bounds()).toQuad(bitmapBounds);
  10. matrix.setPolyToPoly(bitmapBounds, perspect, 4);
  11. SkPaint paint;
  12. paint.setAntiAlias(true);
  13. paint.setStrokeWidth(3);
  14. for (int x : { 0, source.width() } ) {
  15. for (int y : { 0, source.height() } ) {
  16. canvas->drawPoint(matrix.mapXY(x, y), paint);
  17. }
  18. }
  19. canvas->concat(matrix);
  20. canvas->drawBitmap(source, 0, 0);
  21. }
  22. } // END FIDDLE