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 REG_FIDDLE(Matrix_invert, 256, 128, false, 0) {
draw(SkCanvas * canvas)5 void draw(SkCanvas* canvas) {
6 const SkPoint src[] = { { 10, 120}, {120, 120}, {120, 10}, { 10, 10} };
7 const SkPoint dst[] = { {150, 120}, {200, 100}, {240, 30}, { 130, 40} };
8 SkPaint paint;
9 paint.setAntiAlias(true);
10 SkMatrix matrix;
11 matrix.setPolyToPoly(src, dst, 4);
12 canvas->drawPoints(SkCanvas::kPolygon_PointMode, 4, src, paint);
13 canvas->drawPoints(SkCanvas::kPolygon_PointMode, 4, dst, paint);
14 paint.setColor(SK_ColorBLUE);
15 paint.setStrokeWidth(3);
16 paint.setStrokeCap(SkPaint::kRound_Cap);
17 canvas->drawPoints(SkCanvas::kPoints_PointMode, 4, dst, paint);
18 if (matrix.invert(&matrix)) {
19 canvas->concat(matrix);
20 canvas->drawPoints(SkCanvas::kPoints_PointMode, 4, dst, paint);
21 }
22 }
23 } // END FIDDLE
24