SamplePath.cpp revision 8a1c16ff38322f0210116fa7293eb8817c7e477e 
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 "SkShaderExtras.h"
14#include "SkColorPriv.h"
15#include "SkColorFilter.h"
16#include "SkTime.h"
17#include "SkTypeface.h"
18
19class PathView : public SkView {
20public:
21    int fDStroke, fStroke, fMinStroke, fMaxStroke;
22    SkPath fPath[6];
23    bool fShowHairline;
24
25	PathView()
26    {
27        fShowHairline = false;
28
29        fDStroke = 1;
30        fStroke = 10;
31        fMinStroke = 10;
32        fMaxStroke = 180;
33
34        const int V = 85;
35
36        fPath[0].moveTo(SkIntToScalar(40), SkIntToScalar(70));
37        fPath[0].lineTo(SkIntToScalar(70), SkIntToScalar(70) + SK_Scalar1/1);
38        fPath[0].lineTo(SkIntToScalar(110), SkIntToScalar(70));
39
40        fPath[1].moveTo(SkIntToScalar(40), SkIntToScalar(70));
41        fPath[1].lineTo(SkIntToScalar(70), SkIntToScalar(70) - SK_Scalar1/1);
42        fPath[1].lineTo(SkIntToScalar(110), SkIntToScalar(70));
43
44        fPath[2].moveTo(SkIntToScalar(V), SkIntToScalar(V));
45        fPath[2].lineTo(SkIntToScalar(50), SkIntToScalar(V));
46        fPath[2].lineTo(SkIntToScalar(50), SkIntToScalar(50));
47
48        fPath[3].moveTo(SkIntToScalar(50), SkIntToScalar(50));
49        fPath[3].lineTo(SkIntToScalar(50), SkIntToScalar(V));
50        fPath[3].lineTo(SkIntToScalar(V), SkIntToScalar(V));
51
52        fPath[4].moveTo(SkIntToScalar(50), SkIntToScalar(50));
53        fPath[4].lineTo(SkIntToScalar(50), SkIntToScalar(V));
54        fPath[4].lineTo(SkIntToScalar(52), SkIntToScalar(50));
55
56        fPath[5].moveTo(SkIntToScalar(52), SkIntToScalar(50));
57        fPath[5].lineTo(SkIntToScalar(50), SkIntToScalar(V));
58        fPath[5].lineTo(SkIntToScalar(50), SkIntToScalar(50));
59    }
60
61    virtual ~PathView()
62    {
63    }
64
65    void nextStroke()
66    {
67        fStroke += fDStroke;
68        if (fStroke > fMaxStroke || fStroke < fMinStroke)
69            fDStroke = -fDStroke;
70    }
71
72protected:
73    // overrides from SkEventSink
74    virtual bool onQuery(SkEvent* evt)
75    {
76        if (SampleCode::TitleQ(*evt))
77        {
78            SampleCode::TitleR(evt, "Paths");
79            return true;
80        }
81        return this->INHERITED::onQuery(evt);
82    }
83
84    void drawBG(SkCanvas* canvas)
85    {
86        canvas->drawColor(0xFFDDDDDD);
87//        canvas->drawColor(SK_ColorWHITE);
88    }
89
90    void drawPath(SkCanvas* canvas, const SkPath& path, SkPaint::Join j)
91    {
92        SkPaint paint;
93
94        paint.setAntiAlias(true);
95        paint.setStyle(SkPaint::kStroke_Style);
96        paint.setStrokeJoin(j);
97        paint.setStrokeWidth(SkIntToScalar(fStroke));
98
99        if (fShowHairline)
100        {
101            SkPath  fill;
102
103            paint.getFillPath(path, &fill);
104            paint.setStrokeWidth(0);
105            canvas->drawPath(fill, paint);
106        }
107        else
108            canvas->drawPath(path, paint);
109
110        paint.setColor(SK_ColorRED);
111        paint.setStrokeWidth(0);
112        canvas->drawPath(path, paint);
113    }
114
115    virtual void onDraw(SkCanvas* canvas)
116    {
117        this->drawBG(canvas);
118
119        canvas->translate(SkIntToScalar(50), SkIntToScalar(50));
120
121        static const SkPaint::Join gJoins[] = {
122            SkPaint::kBevel_Join,
123            SkPaint::kMiter_Join,
124            SkPaint::kRound_Join
125        };
126
127        for (int i = 0; i < SK_ARRAY_COUNT(gJoins); i++)
128        {
129            canvas->save();
130            for (int j = 0; j < SK_ARRAY_COUNT(fPath); j++)
131            {
132                this->drawPath(canvas, fPath[j], gJoins[i]);
133                canvas->translate(SkIntToScalar(200), 0);
134            }
135            canvas->restore();
136
137            canvas->translate(0, SkIntToScalar(200));
138        }
139
140        this->nextStroke();
141        this->inval(NULL);
142    }
143
144    virtual SkView::Click* onFindClickHandler(SkScalar x, SkScalar y)
145    {
146        fShowHairline = !fShowHairline;
147        this->inval(NULL);
148        return this->INHERITED::onFindClickHandler(x, y);
149    }
150
151    virtual bool onClick(Click* click)
152    {
153        return this->INHERITED::onClick(click);
154    }
155
156private:
157    typedef SkView INHERITED;
158};
159
160//////////////////////////////////////////////////////////////////////////////
161
162static SkView* MyFactory() { return new PathView; }
163static SkViewRegister reg(MyFactory);
164
165