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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 */
7
8#include "gm.h"
9#include "SkCanvas.h"
10#include "SkPath.h"
11
12// Reproduces https://code.google.com/p/chromium/issues/detail?id=279014
13
jvanverth@google.comeb95d6a2013-09-19 17:21:39 +000014static const int kWidth = 640;
15static const int kHeight = 480;
jvanverth@google.com4ea28782013-09-19 15:32:22 +000016static const SkScalar kAngle = 0.305f;
17
18// Renders a string art shape.
19// The particular shape rendered can be controlled by adjusting kAngle, from 0 to 1
20
21class StringArtGM : public skiagm::GM {
22public:
23 StringArtGM() {}
24
25protected:
commit-bot@chromium.orga90c6802014-04-30 13:20:45 +000026
mtklein36352bf2015-03-25 18:17:31 -070027 SkString onShortName() override {
jvanverth@google.com4ea28782013-09-19 15:32:22 +000028 return SkString("stringart");
29 }
30
mtklein36352bf2015-03-25 18:17:31 -070031 SkISize onISize() override {
jvanverth@google.com4ea28782013-09-19 15:32:22 +000032 return SkISize::Make(kWidth, kHeight);
33 }
34
mtklein36352bf2015-03-25 18:17:31 -070035 void onDraw(SkCanvas* canvas) override {
jvanverth@google.com4ea28782013-09-19 15:32:22 +000036 SkScalar angle = kAngle*SK_ScalarPI + SkScalarHalf(SK_ScalarPI);
jvanverth@google.comeb95d6a2013-09-19 17:21:39 +000037 SkScalar size = SkIntToScalar(SkMin32(kWidth, kHeight));
jvanverth@google.com4ea28782013-09-19 15:32:22 +000038 SkPoint center = SkPoint::Make(SkScalarHalf(kWidth), SkScalarHalf(kHeight));
39 SkScalar length = 5;
40 SkScalar step = angle;
41
42 SkPath path;
43 path.moveTo(center);
44
45 while (length < (SkScalarHalf(size) - 10.f))
46 {
47 SkPoint rp = SkPoint::Make(length*SkScalarCos(step) + center.fX,
48 length*SkScalarSin(step) + center.fY);
49 path.lineTo(rp);
reed80ea19c2015-05-12 10:37:34 -070050 length += angle / SkScalarHalf(SK_ScalarPI);
jvanverth@google.com4ea28782013-09-19 15:32:22 +000051 step += angle;
52 }
53 path.close();
54
55 SkPaint paint;
56 paint.setAntiAlias(true);
57 paint.setStyle(SkPaint::kStroke_Style);
caryclark12596012015-07-29 05:27:47 -070058 paint.setColor(sk_tool_utils::color_to_565(0xFF007700));
jvanverth@google.com4ea28782013-09-19 15:32:22 +000059
60 canvas->drawPath(path, paint);
61 }
62
63private:
64 typedef GM INHERITED;
65};
66
67DEF_GM( return new StringArtGM; )