blob: 84914fb934da8d8e68e0c4cf68eaf5c02c80f74a [file] [log] [blame]
Hal Canary83c2f702019-03-07 14:53:03 -05001// Copyright 2019 Google LLC.
2// Use of this source code is governed by a BSD-style license that can be found in the LICENSE file.
3#include "fiddle/examples.h"
4// HASH=fad6b92b21b1e1deeae61978cec2d232
5REG_FIDDLE(Matrix_093, 256, 256, false, 3) {
6void draw(SkCanvas* canvas) {
7 SkMatrix matrix;
8 const SkPoint center = { 128, 128 };
9 matrix.setScale(20, 25, center.fX, center.fY);
10 matrix.postRotate(75, center.fX, center.fY);
11 {
12 SkAutoCanvasRestore acr(canvas, true);
13 canvas->concat(matrix);
14 canvas->drawBitmap(source, 0, 0);
15 }
16 if (matrix.isFixedStepInX()) {
17 SkPaint paint;
18 paint.setAntiAlias(true);
19 SkVector step = matrix.fixedStepInX(128);
20 SkVector end = center + step;
21 canvas->drawLine(center, end, paint);
22 SkVector arrow = { step.fX + step.fY, step.fY - step.fX};
23 arrow = arrow * .25f;
24 canvas->drawLine(end, end - arrow, paint);
25 canvas->drawLine(end, {end.fX + arrow.fY, end.fY - arrow.fX}, paint);
26 }
27}
28} // END FIDDLE