42 lines
2.0 KiB
C++
42 lines
2.0 KiB
C++
#if 0 // Disabled until updated to use current API.
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// Copyright 2019 Google LLC.
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// Use of this source code is governed by a BSD-style license that can be found in the LICENSE file.
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#include "tools/fiddle/examples.h"
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// HASH=6d6f2082fcf59d9f02bfb1758b87db69
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REG_FIDDLE(Matrix_mapRadius, 256, 256, false, 0) {
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void draw(SkCanvas* canvas) {
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SkPaint paint;
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paint.setAntiAlias(true);
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SkMatrix matrix;
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const SkPoint center = {108, 93};
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matrix.setScale(2, .5f, center.fX, center.fY);
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matrix.postRotate(45, center.fX, center.fY);
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const SkScalar circleRadius = 50;
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SkScalar mappedRadius = matrix.mapRadius(circleRadius);
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SkVector minorAxis, majorAxis;
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matrix.mapVector(0, circleRadius, &minorAxis);
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matrix.mapVector(circleRadius, 0, &majorAxis);
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SkString mappedArea;
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mappedArea.printf("area = %g", mappedRadius * mappedRadius);
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canvas->drawString(mappedArea, 145, 250, paint);
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canvas->drawString("mappedRadius", center.fX + mappedRadius + 3, center.fY, paint);
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paint.setColor(SK_ColorRED);
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SkString axArea;
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axArea.printf("area = %g", majorAxis.length() * minorAxis.length());
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paint.setStyle(SkPaint::kFill_Style);
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canvas->drawString(axArea, 15, 250, paint);
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paint.setStyle(SkPaint::kStroke_Style);
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canvas->drawRect({10, 200, 10 + majorAxis.length(), 200 + minorAxis.length()}, paint);
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paint.setColor(SK_ColorBLACK);
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canvas->drawLine(center.fX, center.fY, center.fX + mappedRadius, center.fY, paint);
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canvas->drawLine(center.fX, center.fY, center.fX, center.fY + mappedRadius, paint);
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canvas->drawRect({140, 180, 140 + mappedRadius, 180 + mappedRadius}, paint);
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canvas->concat(matrix);
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canvas->drawCircle(center.fX, center.fY, circleRadius, paint);
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paint.setColor(SK_ColorRED);
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canvas->drawLine(center.fX, center.fY, center.fX + circleRadius, center.fY, paint);
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canvas->drawLine(center.fX, center.fY, center.fX, center.fY + circleRadius, paint);
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}
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} // END FIDDLE
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#endif // Disabled until updated to use current API.
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