1/*
2 * Copyright 2015 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 "SkRRect.h"
11#include "SkPath.h"
12
13class ScaledStrokesGM : public skiagm::GM {
14public:
15    ScaledStrokesGM() {}
16
17protected:
18
19    SkString onShortName() override {
20        return SkString("scaledstrokes");
21    }
22
23    SkISize onISize() override {
24        return SkISize::Make(640, 320);
25    }
26
27    static void draw_path(SkScalar size, SkCanvas* canvas, SkPaint paint) {
28        SkScalar c = 0.551915024494f * size;
29        SkPath path;
30        path.moveTo(0.0f, size);
31        path.cubicTo(c, size, size, c, size, 0.0f);
32        path.cubicTo(size, -c, c, -size, 0.0f, -size);
33        path.cubicTo(-c, -size, -size, -c, -size, 0.0f);
34        path.cubicTo(-size, c, -c, size, 0.0f, size);
35        canvas->drawPath(path, paint);
36    }
37
38    void onDraw(SkCanvas* canvas) override {
39        SkPaint paint;
40        SkPath path;
41        paint.setStyle(SkPaint::Style::kStroke_Style);
42        canvas->translate(5.0f, 5.0f);
43        const SkScalar size = 60.0f;
44        for (int i = 0; i < 2; i++) {
45            paint.setAntiAlias(i == 1);
46            for (int j = 0; j < 4; j++) {
47                SkScalar scale = 4.0f - j;
48                paint.setStrokeWidth(4.0f / scale);
49                canvas->save();
50                canvas->translate(size / 2.0f, size / 2.0f);
51                canvas->scale(scale, scale);
52                draw_path(size / 2.0f / scale, canvas, paint);
53                canvas->restore();
54
55                canvas->save();
56                canvas->translate(size / 2.0f, 80.0f + size / 2.0f);
57                canvas->scale(scale, scale);
58                canvas->drawCircle(0.0f, 0.0f, size / 2.0f / scale, paint);
59                canvas->restore();
60
61                canvas->save();
62                canvas->translate(0.0f, 160.0f);
63                canvas->scale(scale, scale);
64                canvas->drawRect(SkRect::MakeXYWH(0.0f, 0.0f, size / scale, size / scale), paint);
65                canvas->restore();
66
67                canvas->save();
68                canvas->translate(0.0f, 240.0f);
69                canvas->scale(scale, scale);
70                canvas->drawLine(0.0f, 0.0f, size / scale, size / scale, paint);
71                canvas->restore();
72
73                canvas->translate(80.0f, 0.0f);
74            }
75        }
76
77    }
78
79private:
80    typedef GM INHERITED;
81};
82
83DEF_GM( return new ScaledStrokesGM; )
84