Hal Canary | 8751512 | 2019-03-15 14:22:51 -0400 | [diff] [blame] | 1 | // 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. |
Mike Klein | c0bd9f9 | 2019-04-23 12:05:21 -0500 | [diff] [blame] | 3 | #include "tools/fiddle/examples.h" |
Hal Canary | 8751512 | 2019-03-15 14:22:51 -0400 | [diff] [blame] | 4 | // HASH=fad6b92b21b1e1deeae61978cec2d232 |
Hal Canary | a7181e7c | 2019-03-18 16:06:34 -0400 | [diff] [blame] | 5 | REG_FIDDLE(Matrix_fixedStepInX, 256, 256, false, 3) { |
Hal Canary | 8751512 | 2019-03-15 14:22:51 -0400 | [diff] [blame] | 6 | void 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 |