d88c2e8e09
Change-Id: I9a6b2780cfdd91cdd16d5a08eb9ba1214492cb7e Reviewed-on: https://skia-review.googlesource.com/c/skia/+/201982 Commit-Queue: Hal Canary <halcanary@google.com> Reviewed-by: Hal Canary <halcanary@google.com>
29 lines
1.0 KiB
C++
29 lines
1.0 KiB
C++
// 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 "fiddle/examples.h"
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// HASH=fad6b92b21b1e1deeae61978cec2d232
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REG_FIDDLE(Matrix_fixedStepInX, 256, 256, false, 3) {
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void draw(SkCanvas* canvas) {
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SkMatrix matrix;
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const SkPoint center = { 128, 128 };
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matrix.setScale(20, 25, center.fX, center.fY);
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matrix.postRotate(75, center.fX, center.fY);
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{
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SkAutoCanvasRestore acr(canvas, true);
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canvas->concat(matrix);
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canvas->drawBitmap(source, 0, 0);
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}
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if (matrix.isFixedStepInX()) {
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SkPaint paint;
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paint.setAntiAlias(true);
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SkVector step = matrix.fixedStepInX(128);
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SkVector end = center + step;
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canvas->drawLine(center, end, paint);
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SkVector arrow = { step.fX + step.fY, step.fY - step.fX};
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arrow = arrow * .25f;
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canvas->drawLine(end, end - arrow, paint);
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canvas->drawLine(end, {end.fX + arrow.fY, end.fY - arrow.fX}, paint);
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}
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}
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} // END FIDDLE
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