1 /*
2  * Copyright 2011 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 #include "SampleCode.h"
8 #include "SkView.h"
9 #include "SkCanvas.h"
10 #include "SkGraphics.h"
11 #include "SkRandom.h"
12 #include "SkDashPathEffect.h"
13 #include "SkShader.h"
14 
15 static void setBitmapDash(SkPaint* paint, int width) {
16     SkColor c = paint->getColor();
17 
18     SkBitmap bm;
19     bm.allocN32Pixels(2, 1);
20     bm.lockPixels();
21     *bm.getAddr32(0, 0) = SkPreMultiplyARGB(0xFF, SkColorGetR(c),
22                                             SkColorGetG(c), SkColorGetB(c));
23     *bm.getAddr32(1, 0) = 0;
24     bm.unlockPixels();
25 
26     SkMatrix matrix;
27     matrix.setScale(SkIntToScalar(width), SK_Scalar1);
28 
29     SkShader* s = SkShader::CreateBitmapShader(bm, SkShader::kRepeat_TileMode,
30                                                SkShader::kClamp_TileMode, &matrix);
31 
32     paint->setShader(s)->unref();
33 }
34 
35 class DashView : public SampleView {
36 public:
37     DashView() {
38         this->setBGColor(0xFFDDDDDD);
39     }
40 
41 protected:
42     // overrides from SkEventSink
43     virtual bool onQuery(SkEvent* evt) {
44         if (SampleCode::TitleQ(*evt)) {
45             SampleCode::TitleR(evt, "Dash");
46             return true;
47         }
48         return this->INHERITED::onQuery(evt);
49     }
50 
51     virtual void onDrawContent(SkCanvas* canvas) {
52         static const char* gStr[] = {
53             "11",
54             "44",
55             "112233",
56             "411327463524",
57         };
58 
59         SkPaint paint;
60         paint.setStrokeWidth(SkIntToScalar(1));
61 
62         SkScalar x0 = SkIntToScalar(10);
63         SkScalar y0 = SkIntToScalar(10);
64         SkScalar x1 = x0 + SkIntToScalar(1000);
65         for (size_t i = 0; i < SK_ARRAY_COUNT(gStr); i++) {
66             SkScalar interval[12];
67             size_t len = SkMin32(strlen(gStr[i]), SK_ARRAY_COUNT(interval));
68             for (size_t j = 0; j < len; j++) {
69                 interval[j] = SkIntToScalar(gStr[i][j] - '0');
70             }
71 
72             SkDashPathEffect dash(interval, len, 0);
73             paint.setPathEffect(&dash);
74             canvas->drawLine(x0, y0, x1, y0, paint);
75             paint.setPathEffect(nullptr);
76 
77             y0 += paint.getStrokeWidth() * 3;
78         }
79 
80         setBitmapDash(&paint, 3);
81         canvas->drawLine(x0, y0, x1, y0, paint);
82     }
83 
84 private:
85     typedef SampleView INHERITED;
86 };
87 
88 //////////////////////////////////////////////////////////////////////////////
89 
90 static SkView* MyFactory() { return new DashView; }
91 static SkViewRegister reg(MyFactory);
92