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=0e03cd9f154603ed4b21ca56d69dae44
5REG_FIDDLE(Matrix_invert, 256, 128, false, 0) {
6void draw(SkCanvas* canvas) {
7    const SkPoint src[] = { { 10, 120}, {120, 120}, {120, 10}, {  10, 10} };
8    const SkPoint dst[] = { {150, 120}, {200, 100}, {240, 30}, { 130, 40} };
9    SkPaint paint;
10    paint.setAntiAlias(true);
11    SkMatrix matrix;
12    matrix.setPolyToPoly(src, dst, 4);
13    canvas->drawPoints(SkCanvas::kPolygon_PointMode, 4, src, paint);
14    canvas->drawPoints(SkCanvas::kPolygon_PointMode, 4, dst, paint);
15    paint.setColor(SK_ColorBLUE);
16    paint.setStrokeWidth(3);
17    paint.setStrokeCap(SkPaint::kRound_Cap);
18    canvas->drawPoints(SkCanvas::kPoints_PointMode, 4, dst, paint);
19    if (matrix.invert(&matrix)) {
20        canvas->concat(matrix);
21        canvas->drawPoints(SkCanvas::kPoints_PointMode, 4, dst, paint);
22    }
23}
24}  // END FIDDLE
25