SamplePath.cpp revision 6efdc47afc8bb24603fc0d15146ada609b728f2f 
1#include "SampleCode.h"
2#include "SkView.h"
3#include "SkCanvas.h"
4#include "SkGradientShader.h"
5#include "SkGraphics.h"
6#include "SkImageDecoder.h"
7#include "SkPath.h"
8#include "SkPorterDuff.h"
9#include "SkRegion.h"
10#include "SkShader.h"
11#include "SkUtils.h"
12#include "SkXfermode.h"
13#include "SkColorPriv.h"
14#include "SkColorFilter.h"
15#include "SkTime.h"
16#include "SkTypeface.h"
17
18class PathView : public SkView {
19public:
20    int fDStroke, fStroke, fMinStroke, fMaxStroke;
21    SkPath fPath[6];
22    bool fShowHairline;
23
24	PathView()
25    {
26        fShowHairline = false;
27
28        fDStroke = 1;
29        fStroke = 10;
30        fMinStroke = 10;
31        fMaxStroke = 180;
32
33        const int V = 85;
34
35        fPath[0].moveTo(SkIntToScalar(40), SkIntToScalar(70));
36        fPath[0].lineTo(SkIntToScalar(70), SkIntToScalar(70) + SK_Scalar1/1);
37        fPath[0].lineTo(SkIntToScalar(110), SkIntToScalar(70));
38
39        fPath[1].moveTo(SkIntToScalar(40), SkIntToScalar(70));
40        fPath[1].lineTo(SkIntToScalar(70), SkIntToScalar(70) - SK_Scalar1/1);
41        fPath[1].lineTo(SkIntToScalar(110), SkIntToScalar(70));
42
43        fPath[2].moveTo(SkIntToScalar(V), SkIntToScalar(V));
44        fPath[2].lineTo(SkIntToScalar(50), SkIntToScalar(V));
45        fPath[2].lineTo(SkIntToScalar(50), SkIntToScalar(50));
46
47        fPath[3].moveTo(SkIntToScalar(50), SkIntToScalar(50));
48        fPath[3].lineTo(SkIntToScalar(50), SkIntToScalar(V));
49        fPath[3].lineTo(SkIntToScalar(V), SkIntToScalar(V));
50
51        fPath[4].moveTo(SkIntToScalar(50), SkIntToScalar(50));
52        fPath[4].lineTo(SkIntToScalar(50), SkIntToScalar(V));
53        fPath[4].lineTo(SkIntToScalar(52), SkIntToScalar(50));
54
55        fPath[5].moveTo(SkIntToScalar(52), SkIntToScalar(50));
56        fPath[5].lineTo(SkIntToScalar(50), SkIntToScalar(V));
57        fPath[5].lineTo(SkIntToScalar(50), SkIntToScalar(50));
58    }
59
60    virtual ~PathView()
61    {
62    }
63
64    void nextStroke()
65    {
66        fStroke += fDStroke;
67        if (fStroke > fMaxStroke || fStroke < fMinStroke)
68            fDStroke = -fDStroke;
69    }
70
71protected:
72    // overrides from SkEventSink
73    virtual bool onQuery(SkEvent* evt)
74    {
75        if (SampleCode::TitleQ(*evt))
76        {
77            SampleCode::TitleR(evt, "Paths");
78            return true;
79        }
80        return this->INHERITED::onQuery(evt);
81    }
82
83    void drawBG(SkCanvas* canvas)
84    {
85        canvas->drawColor(0xFFDDDDDD);
86//        canvas->drawColor(SK_ColorWHITE);
87    }
88
89    void drawPath(SkCanvas* canvas, const SkPath& path, SkPaint::Join j)
90    {
91        SkPaint paint;
92
93        paint.setAntiAlias(true);
94        paint.setStyle(SkPaint::kStroke_Style);
95        paint.setStrokeJoin(j);
96        paint.setStrokeWidth(SkIntToScalar(fStroke));
97
98        if (fShowHairline)
99        {
100            SkPath  fill;
101
102            paint.getFillPath(path, &fill);
103            paint.setStrokeWidth(0);
104            canvas->drawPath(fill, paint);
105        }
106        else
107            canvas->drawPath(path, paint);
108
109        paint.setColor(SK_ColorRED);
110        paint.setStrokeWidth(0);
111        canvas->drawPath(path, paint);
112    }
113
114    virtual void onDraw(SkCanvas* canvas)
115    {
116        this->drawBG(canvas);
117
118        canvas->translate(SkIntToScalar(50), SkIntToScalar(50));
119
120        static const SkPaint::Join gJoins[] = {
121            SkPaint::kBevel_Join,
122            SkPaint::kMiter_Join,
123            SkPaint::kRound_Join
124        };
125
126        for (int i = 0; i < SK_ARRAY_COUNT(gJoins); i++)
127        {
128            canvas->save();
129            for (int j = 0; j < SK_ARRAY_COUNT(fPath); j++)
130            {
131                this->drawPath(canvas, fPath[j], gJoins[i]);
132                canvas->translate(SkIntToScalar(200), 0);
133            }
134            canvas->restore();
135
136            canvas->translate(0, SkIntToScalar(200));
137        }
138
139        this->nextStroke();
140        this->inval(NULL);
141    }
142
143    virtual SkView::Click* onFindClickHandler(SkScalar x, SkScalar y)
144    {
145        fShowHairline = !fShowHairline;
146        this->inval(NULL);
147        return this->INHERITED::onFindClickHandler(x, y);
148    }
149
150    virtual bool onClick(Click* click)
151    {
152        return this->INHERITED::onClick(click);
153    }
154
155private:
156    typedef SkView INHERITED;
157};
158
159//////////////////////////////////////////////////////////////////////////////
160
161static SkView* MyFactory() { return new PathView; }
162static SkViewRegister reg(MyFactory);
163
164