1#if 0  // Disabled until updated to use current API.
2// Copyright 2019 Google LLC.
3// Use of this source code is governed by a BSD-style license that can be found in the LICENSE file.
4#include "tools/fiddle/examples.h"
5// HASH=6d6f2082fcf59d9f02bfb1758b87db69
6REG_FIDDLE(Matrix_mapRadius, 256, 256, false, 0) {
7void draw(SkCanvas* canvas) {
8    SkPaint paint;
9    paint.setAntiAlias(true);
10    SkMatrix matrix;
11    const SkPoint center = {108, 93};
12    matrix.setScale(2, .5f, center.fX, center.fY);
13    matrix.postRotate(45, center.fX, center.fY);
14    const SkScalar circleRadius = 50;
15    SkScalar mappedRadius = matrix.mapRadius(circleRadius);
16    SkVector minorAxis, majorAxis;
17    matrix.mapVector(0, circleRadius, &minorAxis);
18    matrix.mapVector(circleRadius, 0, &majorAxis);
19    SkString mappedArea;
20    mappedArea.printf("area = %g", mappedRadius * mappedRadius);
21    canvas->drawString(mappedArea, 145, 250, paint);
22    canvas->drawString("mappedRadius", center.fX + mappedRadius + 3, center.fY, paint);
23    paint.setColor(SK_ColorRED);
24    SkString axArea;
25    axArea.printf("area = %g", majorAxis.length() * minorAxis.length());
26    paint.setStyle(SkPaint::kFill_Style);
27    canvas->drawString(axArea, 15, 250, paint);
28    paint.setStyle(SkPaint::kStroke_Style);
29    canvas->drawRect({10, 200, 10 + majorAxis.length(), 200 + minorAxis.length()}, paint);
30    paint.setColor(SK_ColorBLACK);
31    canvas->drawLine(center.fX, center.fY, center.fX + mappedRadius, center.fY, paint);
32    canvas->drawLine(center.fX, center.fY, center.fX, center.fY + mappedRadius, paint);
33    canvas->drawRect({140, 180, 140 + mappedRadius, 180 + mappedRadius}, paint);
34    canvas->concat(matrix);
35    canvas->drawCircle(center.fX, center.fY, circleRadius, paint);
36    paint.setColor(SK_ColorRED);
37    canvas->drawLine(center.fX, center.fY, center.fX + circleRadius, center.fY, paint);
38    canvas->drawLine(center.fX, center.fY, center.fX, center.fY + circleRadius, paint);
39}
40}  // END FIDDLE
41#endif  // Disabled until updated to use current API.
42