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 */
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
14static const int kWidth = 640;
15static const int kHeight = 480;
16static 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:
26
27    SkString onShortName() override {
28        return SkString("stringart");
29    }
30
31    SkISize onISize() override {
32        return SkISize::Make(kWidth, kHeight);
33    }
34
35    void onDraw(SkCanvas* canvas) override {
36        SkScalar angle = kAngle*SK_ScalarPI + SkScalarHalf(SK_ScalarPI);
37        SkScalar size = SkIntToScalar(SkMin32(kWidth, kHeight));
38        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);
50            length += angle / SkScalarHalf(SK_ScalarPI);
51            step += angle;
52        }
53        path.close();
54
55        SkPaint paint;
56        paint.setAntiAlias(true);
57        paint.setStyle(SkPaint::kStroke_Style);
58        paint.setColor(sk_tool_utils::color_to_565(0xFF007700));
59
60        canvas->drawPath(path, paint);
61    }
62
63private:
64    typedef GM INHERITED;
65};
66
67DEF_GM( return new StringArtGM; )
68