1 /*
2  * Copyright 2016 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/gm.h"
9 #include "include/core/SkCanvas.h"
10 #include "include/core/SkColor.h"
11 #include "include/core/SkPaint.h"
12 #include "include/core/SkPoint.h"
13 #include "include/core/SkRect.h"
14 #include "include/core/SkRefCnt.h"
15 #include "include/core/SkScalar.h"
16 #include "include/core/SkShader.h"
17 #include "include/core/SkTileMode.h"
18 #include "include/effects/SkGradientShader.h"
19 
20 #include <initializer_list>
21 #include <utility>
22 
23 namespace skiagm {
24 
25 // Draw stroked rects (both AA and nonAA) with all the types of joins:
26 //    bevel, miter, miter-limited-to-bevel, round
27 // and as a hairline.
28 DEF_SIMPLE_GM(stroke_rect_shader, canvas, 690, 300) {
29     constexpr SkRect kRect {0, 0, 100, 100};
30     constexpr SkPoint kPts[] {{kRect.fLeft, kRect.fTop}, {kRect.fRight, kRect.fBottom}};
31     constexpr SkColor kColors[] {SK_ColorRED, SK_ColorBLUE};
32     SkPaint paint;
33     sk_sp<SkShader> shader = SkGradientShader::MakeLinear(kPts, kColors, nullptr, 2,
34                                                           SkTileMode::kClamp);
35     paint.setShader(std::move(shader));
36     paint.setStyle(SkPaint::kStroke_Style);
37     // Do a large initial translate so that local coords disagree with device coords significantly
38     // for the first rect drawn.
39     canvas->translate(kRect.centerX(), kRect.centerY());
40     constexpr SkScalar kPad = 20;
41     for (auto aa : {false, true}) {
42         paint.setAntiAlias(aa);
43         canvas->save();
44 
45         constexpr SkScalar kStrokeWidth = 10;
46         paint.setStrokeWidth(kStrokeWidth);
47 
48         paint.setStrokeJoin(SkPaint::kBevel_Join);
49         canvas->drawRect(kRect, paint);
50         canvas->translate(kRect.width() + kPad, 0);
51 
52         paint.setStrokeJoin(SkPaint::kMiter_Join);
53         canvas->drawRect(kRect, paint);
54         canvas->translate(kRect.width() + kPad, 0);
55 
56         // This miter limit should effectively produce a bevel join.
57         paint.setStrokeMiter(0.01f);
58         canvas->drawRect(kRect, paint);
59         canvas->translate(kRect.width() + kPad, 0);
60 
61         paint.setStrokeJoin(SkPaint::kRound_Join);
62         canvas->drawRect(kRect, paint);
63         canvas->translate(kRect.width() + kPad, 0);
64 
65         paint.setStrokeWidth(0);
66         canvas->drawRect(kRect, paint);
67 
68         canvas->restore();
69         canvas->translate(0, kRect.height() + kPad);
70     }
71 }
72 
73 }  // namespace skiagm
74