1
2/*
3 * Copyright 2011 Google Inc.
4 *
5 * Use of this source code is governed by a BSD-style license that can be
6 * found in the LICENSE file.
7 */
8#include "SampleCode.h"
9#include "SkView.h"
10#include "SkCanvas.h"
11#include "SkPaint.h"
12#include "SkRandom.h"
13#include "SkString.h"
14
15class EmptyPathView : public SampleView {
16public:
17    EmptyPathView() {}
18
19protected:
20    // overrides from SkEventSink
21    virtual bool onQuery(SkEvent* evt) {
22        if (SampleCode::TitleQ(*evt)) {
23            SampleCode::TitleR(evt, "EmptyPath");
24            return true;
25        }
26        return this->INHERITED::onQuery(evt);
27    }
28
29    void drawEmpty(SkCanvas* canvas,
30                   SkColor color,
31                   const SkRect& clip,
32                   SkPaint::Style style,
33                   SkPath::FillType fill) {
34        SkPath path;
35        path.setFillType(fill);
36        SkPaint paint;
37        paint.setColor(color);
38        paint.setStyle(style);
39        canvas->save();
40        canvas->clipRect(clip);
41        canvas->drawPath(path, paint);
42        canvas->restore();
43    }
44
45    virtual void onDrawContent(SkCanvas* canvas) {
46        struct FillAndName {
47            SkPath::FillType fFill;
48            const char*      fName;
49        };
50        static const FillAndName gFills[] = {
51            {SkPath::kWinding_FillType, "Winding"},
52            {SkPath::kEvenOdd_FillType, "Even / Odd"},
53            {SkPath::kInverseWinding_FillType, "Inverse Winding"},
54            {SkPath::kInverseEvenOdd_FillType, "Inverse Even / Odd"},
55        };
56        struct StyleAndName {
57            SkPaint::Style fStyle;
58            const char*    fName;
59        };
60        static const StyleAndName gStyles[] = {
61            {SkPaint::kFill_Style, "Fill"},
62            {SkPaint::kStroke_Style, "Stroke"},
63            {SkPaint::kStrokeAndFill_Style, "Stroke And Fill"},
64        };
65
66        SkPaint titlePaint;
67        titlePaint.setColor(SK_ColorBLACK);
68        titlePaint.setAntiAlias(true);
69        titlePaint.setLCDRenderText(true);
70        titlePaint.setTextSize(24 * SK_Scalar1);
71        const char title[] = "Empty Paths Drawn Into Rectangle Clips With Indicated Style and Fill";
72        canvas->drawText(title, strlen(title),
73                         40 * SK_Scalar1,
74                         100*SK_Scalar1,
75                         titlePaint);
76
77        SkRandom rand;
78        SkRect rect = SkRect::MakeWH(125*SK_Scalar1, 100*SK_Scalar1);
79        int i = 0;
80        canvas->save();
81        canvas->translate(80 * SK_Scalar1, 0);
82        canvas->save();
83        for (size_t style = 0; style < SK_ARRAY_COUNT(gStyles); ++style) {
84            for (size_t fill = 0; fill < SK_ARRAY_COUNT(gFills); ++fill) {
85                if (0 == i % 4) {
86                    canvas->restore();
87                    canvas->translate(0, rect.height() + 50 * SK_Scalar1);
88                    canvas->save();
89                } else {
90                    canvas->translate(rect.width() + 100 * SK_Scalar1, 0);
91                }
92                ++i;
93
94
95                SkColor color = rand.nextU();
96                color = 0xff000000| color; // force solid
97                this->drawEmpty(canvas, color, rect,
98                                gStyles[style].fStyle, gFills[fill].fFill);
99
100                SkPaint rectPaint;
101                rectPaint.setColor(SK_ColorBLACK);
102                rectPaint.setStyle(SkPaint::kStroke_Style);
103                rectPaint.setStrokeWidth(-1);
104                rectPaint.setAntiAlias(true);
105                canvas->drawRect(rect, rectPaint);
106
107                SkString label;
108                label.appendf("%s, %s", gStyles[style].fName, gFills[fill].fName);
109
110                SkPaint labelPaint;
111                labelPaint.setColor(color);
112                labelPaint.setAntiAlias(true);
113                labelPaint.setLCDRenderText(true);
114                canvas->drawText(label.c_str(), label.size(),
115                                 0, rect.height() + 15 * SK_Scalar1,
116                                 labelPaint);
117            }
118        }
119        canvas->restore();
120        canvas->restore();
121    }
122
123private:
124    typedef SampleView INHERITED;
125};
126
127//////////////////////////////////////////////////////////////////////////////
128
129static SkView* MyFactory() { return new EmptyPathView; }
130static SkViewRegister reg(MyFactory);
131