jvanverth@google.com | 4ea2878 | 2013-09-19 15:32:22 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2013 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 | */ |
bungeman | d3ebb48 | 2015-08-05 13:57:49 -0700 | [diff] [blame] | 7 | |
Mike Klein | c0bd9f9 | 2019-04-23 12:05:21 -0500 | [diff] [blame] | 8 | #include "include/core/SkCanvas.h" |
| 9 | #include "include/core/SkPath.h" |
| 10 | #include "samplecode/Sample.h" |
jvanverth@google.com | 4ea2878 | 2013-09-19 15:32:22 +0000 | [diff] [blame] | 11 | |
| 12 | // Reproduces https://code.google.com/p/chromium/issues/detail?id=279014 |
| 13 | |
| 14 | // Renders a string art shape. |
| 15 | // The particular shape rendered can be controlled by clicking horizontally, thereby |
| 16 | // generating an angle from 0 to 1. |
| 17 | |
Ben Wagner | b2c4ea6 | 2018-08-08 11:36:17 -0400 | [diff] [blame] | 18 | class StringArtView : public Sample { |
jvanverth@google.com | 4ea2878 | 2013-09-19 15:32:22 +0000 | [diff] [blame] | 19 | public: |
| 20 | StringArtView() : fAngle(0.305f) {} |
| 21 | |
| 22 | protected: |
Hal Canary | 8a02731 | 2019-07-03 10:55:44 -0400 | [diff] [blame] | 23 | SkString name() override { return SkString("StringArt"); } |
jvanverth@google.com | 4ea2878 | 2013-09-19 15:32:22 +0000 | [diff] [blame] | 24 | |
mtklein | 36352bf | 2015-03-25 18:17:31 -0700 | [diff] [blame] | 25 | void onDrawContent(SkCanvas* canvas) override { |
jvanverth@google.com | 4ea2878 | 2013-09-19 15:32:22 +0000 | [diff] [blame] | 26 | SkScalar angle = fAngle*SK_ScalarPI + SkScalarHalf(SK_ScalarPI); |
| 27 | |
| 28 | SkPoint center = SkPoint::Make(SkScalarHalf(this->width()), SkScalarHalf(this->height())); |
| 29 | SkScalar length = 5; |
| 30 | SkScalar step = angle; |
| 31 | |
| 32 | SkPath path; |
| 33 | path.moveTo(center); |
| 34 | |
Brian Osman | 116b33e | 2020-02-05 13:34:09 -0500 | [diff] [blame] | 35 | while (length < (SkScalarHalf(std::min(this->width(), this->height())) - 10.f)) |
jvanverth@google.com | 4ea2878 | 2013-09-19 15:32:22 +0000 | [diff] [blame] | 36 | { |
| 37 | SkPoint rp = SkPoint::Make(length*SkScalarCos(step) + center.fX, |
| 38 | length*SkScalarSin(step) + center.fY); |
| 39 | path.lineTo(rp); |
reed | 80ea19c | 2015-05-12 10:37:34 -0700 | [diff] [blame] | 40 | length += angle / SkScalarHalf(SK_ScalarPI); |
jvanverth@google.com | 4ea2878 | 2013-09-19 15:32:22 +0000 | [diff] [blame] | 41 | step += angle; |
| 42 | } |
| 43 | path.close(); |
| 44 | |
| 45 | SkPaint paint; |
| 46 | paint.setAntiAlias(true); |
| 47 | paint.setStyle(SkPaint::kStroke_Style); |
| 48 | paint.setColor(0xFF007700); |
| 49 | |
| 50 | canvas->drawPath(path, paint); |
| 51 | } |
| 52 | |
Hal Canary | b1f411a | 2019-08-29 10:39:22 -0400 | [diff] [blame] | 53 | Sample::Click* onFindClickHandler(SkScalar x, SkScalar y, skui::ModifierKey) override { |
jvanverth@google.com | 4ea2878 | 2013-09-19 15:32:22 +0000 | [diff] [blame] | 54 | fAngle = x/width(); |
halcanary | 96fcdcc | 2015-08-27 07:41:13 -0700 | [diff] [blame] | 55 | return nullptr; |
jvanverth@google.com | 4ea2878 | 2013-09-19 15:32:22 +0000 | [diff] [blame] | 56 | } |
| 57 | private: |
| 58 | |
| 59 | SkScalar fAngle; |
John Stiles | 7571f9e | 2020-09-02 22:42:33 -0400 | [diff] [blame] | 60 | using INHERITED = Sample; |
jvanverth@google.com | 4ea2878 | 2013-09-19 15:32:22 +0000 | [diff] [blame] | 61 | }; |
| 62 | |
| 63 | ////////////////////////////////////////////////////////////////////////////// |
| 64 | |
Ben Wagner | b2c4ea6 | 2018-08-08 11:36:17 -0400 | [diff] [blame] | 65 | DEF_SAMPLE( return new StringArtView(); ) |