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 
13 class ScaledStrokesGM : public skiagm::GM {
14 public:
ScaledStrokesGM()15     ScaledStrokesGM() {}
16 
17 protected:
18 
onShortName()19     SkString onShortName() override {
20         return SkString("scaledstrokes");
21     }
22 
onISize()23     SkISize onISize() override {
24         return SkISize::Make(640, 320);
25     }
26 
draw_path(SkScalar size,SkCanvas * canvas,SkPaint paint)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 
onDraw(SkCanvas * canvas)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             canvas->save();
47             for (int j = 0; j < 4; j++) {
48                 SkScalar scale = 4.0f - j;
49                 paint.setStrokeWidth(4.0f / scale);
50                 canvas->save();
51                 canvas->translate(size / 2.0f, size / 2.0f);
52                 canvas->scale(scale, scale);
53                 draw_path(size / 2.0f / scale, canvas, paint);
54                 canvas->restore();
55 
56                 canvas->save();
57                 canvas->translate(size / 2.0f, 80.0f + size / 2.0f);
58                 canvas->scale(scale, scale);
59                 canvas->drawCircle(0.0f, 0.0f, size / 2.0f / scale, paint);
60                 canvas->restore();
61 
62                 canvas->save();
63                 canvas->translate(0.0f, 160.0f);
64                 canvas->scale(scale, scale);
65                 canvas->drawRect(SkRect::MakeXYWH(0.0f, 0.0f, size / scale, size / scale), paint);
66                 canvas->restore();
67 
68                 canvas->save();
69                 canvas->translate(0.0f, 240.0f);
70                 canvas->scale(scale, scale);
71                 canvas->drawLine(0.0f, 0.0f, size / scale, size / scale, paint);
72                 canvas->restore();
73 
74                 canvas->translate(80.0f, 0.0f);
75             }
76         }
77 
78     }
79 
80 private:
81     typedef GM INHERITED;
82 };
83 
84 DEF_GM( return new ScaledStrokesGM; )
85