reed | 19d8f9f | 2015-01-29 10:48:16 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2015 Google Inc. |
| 3 | * |
| 4 | * Use of this source code is governed by a BSD-style license that can be |
| 5 | * found in the LICENSE file. |
| 6 | */ |
| 7 | |
| 8 | #include "gm.h" |
| 9 | #include "SkCanvas.h" |
| 10 | #include "SkRandom.h" |
| 11 | |
| 12 | class AddArcGM : public skiagm::GM { |
reed | d9adfe6 | 2015-02-01 19:01:04 -0800 | [diff] [blame^] | 13 | public: |
| 14 | AddArcGM() : fRotate(0) {} |
| 15 | |
reed | 19d8f9f | 2015-01-29 10:48:16 -0800 | [diff] [blame] | 16 | protected: |
| 17 | SkString onShortName() SK_OVERRIDE { return SkString("addarc"); } |
| 18 | |
| 19 | SkISize onISize() SK_OVERRIDE { return SkISize::Make(1040, 1040); } |
| 20 | |
| 21 | void onDraw(SkCanvas* canvas) SK_OVERRIDE { |
| 22 | canvas->translate(20, 20); |
| 23 | |
| 24 | SkRect r = SkRect::MakeWH(1000, 1000); |
| 25 | |
| 26 | SkPaint paint; |
| 27 | paint.setAntiAlias(true); |
| 28 | paint.setStyle(SkPaint::kStroke_Style); |
| 29 | paint.setStrokeWidth(15); |
| 30 | |
| 31 | const SkScalar inset = paint.getStrokeWidth() + 4; |
| 32 | const SkScalar sweepAngle = 345; |
| 33 | SkRandom rand; |
| 34 | |
reed | d9adfe6 | 2015-02-01 19:01:04 -0800 | [diff] [blame^] | 35 | SkScalar sign = 1; |
reed | 19d8f9f | 2015-01-29 10:48:16 -0800 | [diff] [blame] | 36 | while (r.width() > paint.getStrokeWidth() * 3) { |
| 37 | paint.setColor(rand.nextU() | (0xFF << 24)); |
| 38 | SkScalar startAngle = rand.nextUScalar1() * 360; |
| 39 | |
reed | d9adfe6 | 2015-02-01 19:01:04 -0800 | [diff] [blame^] | 40 | SkScalar speed = SkScalarSqrt(16 / r.width()) * 0.5f; |
| 41 | startAngle += fRotate * 360 * speed * sign; |
| 42 | |
reed | 19d8f9f | 2015-01-29 10:48:16 -0800 | [diff] [blame] | 43 | SkPath path; |
| 44 | path.addArc(r, startAngle, sweepAngle); |
| 45 | canvas->drawPath(path, paint); |
| 46 | |
| 47 | r.inset(inset, inset); |
reed | d9adfe6 | 2015-02-01 19:01:04 -0800 | [diff] [blame^] | 48 | sign = -sign; |
reed | 19d8f9f | 2015-01-29 10:48:16 -0800 | [diff] [blame] | 49 | } |
| 50 | } |
| 51 | |
reed | d9adfe6 | 2015-02-01 19:01:04 -0800 | [diff] [blame^] | 52 | bool onAnimatePulse(SkMSec curr, SkMSec prev) SK_OVERRIDE { |
| 53 | fRotate = SkDoubleToScalar(fmod(curr * 0.001, 360)); |
| 54 | return true; |
| 55 | } |
| 56 | |
reed | 19d8f9f | 2015-01-29 10:48:16 -0800 | [diff] [blame] | 57 | private: |
reed | d9adfe6 | 2015-02-01 19:01:04 -0800 | [diff] [blame^] | 58 | SkScalar fRotate; |
reed | 19d8f9f | 2015-01-29 10:48:16 -0800 | [diff] [blame] | 59 | typedef skiagm::GM INHERITED; |
| 60 | }; |
| 61 | DEF_GM( return new AddArcGM; ) |