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/gm.h"
9 #include "include/core/SkCanvas.h"
10 #include "include/core/SkColor.h"
11 #include "include/core/SkPaint.h"
12 #include "include/core/SkRect.h"
13 #include "include/core/SkScalar.h"
14 #include "include/core/SkSize.h"
15 #include "include/core/SkString.h"
16 #include "include/core/SkTypes.h"
17 
18 namespace skiagm {
19 
20 // Draw rects with various stroke widths at 1/8 pixel increments
21 class ThinStrokedRectsGM : public GM {
22 public:
ThinStrokedRectsGM()23     ThinStrokedRectsGM() {
24         this->setBGColor(0xFF000000);
25     }
26 
27 protected:
onShortName()28     SkString onShortName() override {
29         return SkString("thinstrokedrects");
30     }
31 
onISize()32     SkISize onISize() override {
33         return SkISize::Make(240, 320);
34     }
35 
onDraw(SkCanvas * canvas)36     void onDraw(SkCanvas* canvas) override {
37 
38         SkPaint paint;
39         paint.setColor(SK_ColorWHITE);
40         paint.setStyle(SkPaint::kStroke_Style);
41         paint.setAntiAlias(true);
42 
43         constexpr SkRect rect = { 0, 0, 10, 10 };
44         constexpr SkRect rect2 = { 0, 0, 20, 20 };
45 
46         constexpr SkScalar gStrokeWidths[] = {
47             4, 2, 1, 0.5f, 0.25f, 0.125f, 0
48         };
49 
50         canvas->translate(5, 5);
51         for (int i = 0; i < 8; ++i) {
52             canvas->save();
53             canvas->translate(i*0.125f, i*30.0f);
54             for (size_t j = 0; j < SK_ARRAY_COUNT(gStrokeWidths); ++j) {
55                 paint.setStrokeWidth(gStrokeWidths[j]);
56                 canvas->drawRect(rect, paint);
57                 canvas->translate(15, 0);
58             }
59             canvas->restore();
60         }
61 
62         // Draw a second time in red with a scale
63         paint.setColor(SK_ColorRED);
64         canvas->translate(0, 15);
65         for (int i = 0; i < 8; ++i) {
66             canvas->save();
67             canvas->translate(i*0.125f, i*30.0f);
68             canvas->scale(0.5f, 0.5f);
69             for (size_t j = 0; j < SK_ARRAY_COUNT(gStrokeWidths); ++j) {
70                 paint.setStrokeWidth(2.0f * gStrokeWidths[j]);
71                 canvas->drawRect(rect2, paint);
72                 canvas->translate(30, 0);
73             }
74             canvas->restore();
75         }
76     }
77 
78 private:
79     using INHERITED = GM;
80 };
81 
82 //////////////////////////////////////////////////////////////////////////////
83 
84 DEF_GM(return new ThinStrokedRectsGM;)
85 }  // namespace skiagm
86