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 "SkRandom.h"
10
11namespace skiagm {
12
13// This GM draws a lot of arcs in a 'Z' shape. It particularly exercises
14// the 'drawArc' code near a singularly of its processing (i.e., near the
15// edge of one of its underlying quads).
16class ArcOfZorroGM : public GM {
17public:
18    ArcOfZorroGM() {
19        this->setBGColor(0xFFCCCCCC);
20    }
21
22protected:
23    virtual SkString onShortName() SK_OVERRIDE {
24        return SkString("arcofzorro");
25    }
26
27    virtual SkISize onISize() SK_OVERRIDE {
28        return make_isize(1000, 1000);
29    }
30
31    virtual void onDraw(SkCanvas* canvas) SK_OVERRIDE {
32        SkRandom rand;
33
34        SkRect rect = SkRect::MakeXYWH(10, 10, 200, 200);
35
36        SkPaint p;
37
38        p.setStyle(SkPaint::kStroke_Style);
39        p.setStrokeWidth(35);
40        int xOffset = 0, yOffset = 0;
41        int direction = 0;
42
43        for (float arc = 134.0f; arc < 136.0f; arc += 0.01f) {
44            SkColor color = rand.nextU();
45            color |= 0xff000000;
46            p.setColor(color);
47
48            canvas->save();
49            canvas->translate(SkIntToScalar(xOffset), SkIntToScalar(yOffset));
50            canvas->drawArc(rect, 0, arc, false, p);
51            canvas->restore();
52
53            switch (direction) {
54            case 0:
55                xOffset += 10;
56                if (xOffset >= 700) {
57                    direction = 1;
58                }
59                break;
60            case 1:
61                xOffset -= 10;
62                yOffset += 10;
63                if (xOffset < 50) {
64                    direction = 2;
65                }
66                break;
67            case 2:
68                xOffset += 10;
69                break;
70            }
71        }
72
73    }
74
75private:
76    typedef GM INHERITED;
77};
78
79//////////////////////////////////////////////////////////////////////////////
80
81DEF_GM( return SkNEW(ArcOfZorroGM); )
82
83}
84