skia2/docs/examples/Matrix_mapVectors.cpp

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// Copyright 2019 Google LLC.
// Use of this source code is governed by a BSD-style license that can be found in the LICENSE file.
#include "fiddle/examples.h"
// HASH=918a9778c3d7d5cb306692784399f6dc
REG_FIDDLE(Matrix_mapVectors, 256, 256, false, 0) {
void draw(SkCanvas* canvas) {
SkPaint paint;
paint.setAntiAlias(true);
paint.setStyle(SkPaint::kStroke_Style);
SkMatrix matrix;
matrix.reset();
const SkVector radii[] = {{8, 4}, {9, 1}, {6, 2}, {7, 3}};
for (int i = 0; i < 4; ++i) {
SkVector rScaled[4];
matrix.preScale(1.5f, 2.f);
matrix.mapVectors(rScaled, radii, SK_ARRAY_COUNT(radii));
SkRRect rrect;
rrect.setRectRadii({20, 20, 180, 70}, rScaled);
canvas->drawRRect(rrect, paint);
canvas->translate(0, 60);
}
}
} // END FIDDLE