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jvanverth@google.com4ea28782013-09-19 15:32:22 +00001/*
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 */
bungemand3ebb482015-08-05 13:57:49 -07007
Mike Kleinc0bd9f92019-04-23 12:05:21 -05008#include "include/core/SkCanvas.h"
9#include "include/core/SkPath.h"
10#include "samplecode/Sample.h"
jvanverth@google.com4ea28782013-09-19 15:32:22 +000011
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 Wagnerb2c4ea62018-08-08 11:36:17 -040018class StringArtView : public Sample {
jvanverth@google.com4ea28782013-09-19 15:32:22 +000019public:
20 StringArtView() : fAngle(0.305f) {}
21
22protected:
Hal Canary8a027312019-07-03 10:55:44 -040023 SkString name() override { return SkString("StringArt"); }
jvanverth@google.com4ea28782013-09-19 15:32:22 +000024
mtklein36352bf2015-03-25 18:17:31 -070025 void onDrawContent(SkCanvas* canvas) override {
jvanverth@google.com4ea28782013-09-19 15:32:22 +000026 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 Osman116b33e2020-02-05 13:34:09 -050035 while (length < (SkScalarHalf(std::min(this->width(), this->height())) - 10.f))
jvanverth@google.com4ea28782013-09-19 15:32:22 +000036 {
37 SkPoint rp = SkPoint::Make(length*SkScalarCos(step) + center.fX,
38 length*SkScalarSin(step) + center.fY);
39 path.lineTo(rp);
reed80ea19c2015-05-12 10:37:34 -070040 length += angle / SkScalarHalf(SK_ScalarPI);
jvanverth@google.com4ea28782013-09-19 15:32:22 +000041 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 Canaryb1f411a2019-08-29 10:39:22 -040053 Sample::Click* onFindClickHandler(SkScalar x, SkScalar y, skui::ModifierKey) override {
jvanverth@google.com4ea28782013-09-19 15:32:22 +000054 fAngle = x/width();
halcanary96fcdcc2015-08-27 07:41:13 -070055 return nullptr;
jvanverth@google.com4ea28782013-09-19 15:32:22 +000056 }
57private:
58
59 SkScalar fAngle;
John Stiles7571f9e2020-09-02 22:42:33 -040060 using INHERITED = Sample;
jvanverth@google.com4ea28782013-09-19 15:32:22 +000061};
62
63//////////////////////////////////////////////////////////////////////////////
64
Ben Wagnerb2c4ea62018-08-08 11:36:17 -040065DEF_SAMPLE( return new StringArtView(); )