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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 "tools/fiddle/examples.h"
- // HASH=fad6b92b21b1e1deeae61978cec2d232
- REG_FIDDLE(Matrix_fixedStepInX, 256, 256, false, 3) {
- void draw(SkCanvas* canvas) {
- SkMatrix matrix;
- const SkPoint center = { 128, 128 };
- matrix.setScale(20, 25, center.fX, center.fY);
- matrix.postRotate(75, center.fX, center.fY);
- {
- SkAutoCanvasRestore acr(canvas, true);
- canvas->concat(matrix);
- canvas->drawBitmap(source, 0, 0);
- }
- if (matrix.isFixedStepInX()) {
- SkPaint paint;
- paint.setAntiAlias(true);
- SkVector step = matrix.fixedStepInX(128);
- SkVector end = center + step;
- canvas->drawLine(center, end, paint);
- SkVector arrow = { step.fX + step.fY, step.fY - step.fX};
- arrow = arrow * .25f;
- canvas->drawLine(end, end - arrow, paint);
- canvas->drawLine(end, {end.fX + arrow.fY, end.fY - arrow.fX}, paint);
- }
- }
- } // END FIDDLE
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