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    virtual uint32_t onGetFlags() const SK_OVERRIDE {
27        return kSkipTiled_Flag;
28    }
29
30    virtual SkString onShortName() {
31        return SkString("stringart");
32    }
33
34    virtual SkISize onISize() {
35        return SkISize::Make(kWidth, kHeight);
36    }
37
38    virtual void onDraw(SkCanvas* canvas) {
39        SkScalar angle = kAngle*SK_ScalarPI + SkScalarHalf(SK_ScalarPI);
40        SkScalar size = SkIntToScalar(SkMin32(kWidth, kHeight));
41        SkPoint center = SkPoint::Make(SkScalarHalf(kWidth), SkScalarHalf(kHeight));
42        SkScalar length = 5;
43        SkScalar step = angle;
44
45        SkPath path;
46        path.moveTo(center);
47
48        while (length < (SkScalarHalf(size) - 10.f))
49        {
50            SkPoint rp = SkPoint::Make(length*SkScalarCos(step) + center.fX,
51                                       length*SkScalarSin(step) + center.fY);
52            path.lineTo(rp);
53            length += SkScalarDiv(angle, SkScalarHalf(SK_ScalarPI));
54            step += angle;
55        }
56        path.close();
57
58        SkPaint paint;
59        paint.setAntiAlias(true);
60        paint.setStyle(SkPaint::kStroke_Style);
61        paint.setColor(0xFF007700);
62
63        canvas->drawPath(path, paint);
64    }
65
66private:
67    typedef GM INHERITED;
68};
69
70DEF_GM( return new StringArtGM; )
71