SampleComplexClip.cpp revision 807cec4397cb50a64de7355ae129cc7c8f2c772b 
1#include "SampleCode.h"
2#include "SkCanvas.h"
3#include "SkPath.h"
4#include "SkView.h"
5
6class ComplexClipView : public SkView {
7public:
8	ComplexClipView() {
9    }
10
11protected:
12    // overrides from SkEventSink
13    virtual bool onQuery(SkEvent* evt) {
14        if (SampleCode::TitleQ(*evt)) {
15            SampleCode::TitleR(evt, "ComplexClip");
16            return true;
17        }
18        return this->INHERITED::onQuery(evt);
19    }
20
21    void drawBG(SkCanvas* canvas) {
22        canvas->drawColor(SkColorSetRGB(0xA0,0xDD,0xA0));
23    }
24
25    virtual void onDraw(SkCanvas* canvas) {
26        SkPath path;
27        path.moveTo(SkIntToScalar(0),   SkIntToScalar(50));
28        path.quadTo(SkIntToScalar(0),   SkIntToScalar(0),   SkIntToScalar(50),  SkIntToScalar(0));
29        path.lineTo(SkIntToScalar(175), SkIntToScalar(0));
30        path.quadTo(SkIntToScalar(200), SkIntToScalar(0),   SkIntToScalar(200), SkIntToScalar(25));
31        path.lineTo(SkIntToScalar(200), SkIntToScalar(150));
32        path.quadTo(SkIntToScalar(200), SkIntToScalar(200), SkIntToScalar(150), SkIntToScalar(200));
33        path.lineTo(SkIntToScalar(0),   SkIntToScalar(200));
34        path.close();
35        path.moveTo(SkIntToScalar(50),  SkIntToScalar(50));
36        path.lineTo(SkIntToScalar(150), SkIntToScalar(50));
37        path.lineTo(SkIntToScalar(150), SkIntToScalar(125));
38        path.quadTo(SkIntToScalar(150), SkIntToScalar(150), SkIntToScalar(125), SkIntToScalar(150));
39        path.lineTo(SkIntToScalar(50),  SkIntToScalar(150));
40        path.close();
41        path.setFillType(SkPath::kEvenOdd_FillType);
42        SkColor pathColor = SK_ColorBLACK;
43        SkPaint pathPaint;
44        pathPaint.setAntiAlias(true);
45        pathPaint.setColor(pathColor);
46
47        SkPath clipA;
48        clipA.moveTo(SkIntToScalar(10),  SkIntToScalar(20));
49        clipA.lineTo(SkIntToScalar(165), SkIntToScalar(22));
50        clipA.lineTo(SkIntToScalar(70),  SkIntToScalar(105));
51        clipA.lineTo(SkIntToScalar(165), SkIntToScalar(177));
52        clipA.lineTo(SkIntToScalar(-5),  SkIntToScalar(180));
53        clipA.close();
54        SkColor colorA = SK_ColorCYAN;
55
56        SkPath clipB;
57        clipB.moveTo(SkIntToScalar(40),  SkIntToScalar(10));
58        clipB.lineTo(SkIntToScalar(190), SkIntToScalar(15));
59        clipB.lineTo(SkIntToScalar(195), SkIntToScalar(190));
60        clipB.lineTo(SkIntToScalar(40),  SkIntToScalar(185));
61        clipB.lineTo(SkIntToScalar(155), SkIntToScalar(100));
62        clipB.close();
63        SkColor colorB = SK_ColorRED;
64
65        drawBG(canvas);
66        SkPaint paint;
67        paint.setAntiAlias(true);
68
69        paint.setStyle(SkPaint::kStroke_Style);
70        paint.setStrokeWidth(0);
71
72        canvas->translate(SkIntToScalar(10),SkIntToScalar(10));
73        canvas->drawPath(path, pathPaint);
74        paint.setColor(colorA);
75        canvas->drawPath(clipA, paint);
76        paint.setColor(colorB);
77        canvas->drawPath(clipB, paint);
78
79        static const struct {
80            SkRegion::Op fOp;
81            const char*  fName;
82        } gOps[] = { //extra spaces in names for measureText
83            {SkRegion::kIntersect_Op,         "Isect "},
84            {SkRegion::kDifference_Op,        "Diff " },
85            {SkRegion::kUnion_Op,             "Union "},
86            {SkRegion::kXOR_Op,               "Xor "  },
87            {SkRegion::kReverseDifference_Op, "RDiff "}
88        };
89
90        canvas->translate(0, SkIntToScalar(40));
91        canvas->scale(3 * SK_Scalar1 / 4, 3 * SK_Scalar1 / 4);
92        canvas->save();
93
94        for (int invA = 0; invA < 2; ++invA) {
95            for (int op = 0; op < SK_ARRAY_COUNT(gOps); ++op) {
96                int idx = invA * SK_ARRAY_COUNT(gOps) + op;
97                if (!(idx % 3)) {
98                    canvas->restore();
99                    canvas->translate(0, SkIntToScalar(250));
100                    canvas->save();
101                }
102                canvas->save();
103                    // set clip
104                    clipA.setFillType(invA ? SkPath::kInverseEvenOdd_FillType :
105                                             SkPath::kEvenOdd_FillType);
106                    canvas->clipPath(clipA);
107                    canvas->clipPath(clipB, gOps[op].fOp);
108
109                    // draw path clipped
110                    canvas->drawPath(path, pathPaint);
111                canvas->restore();
112
113                // draw path in hairline
114                paint.setColor(pathColor);
115                canvas->drawPath(path, paint);
116
117                // draw clips in hair line
118                paint.setColor(colorA);
119                canvas->drawPath(clipA, paint);
120                paint.setColor(colorB);
121                canvas->drawPath(clipB, paint);
122
123                paint.setTextSize(SkIntToScalar(20));
124
125                SkScalar txtX = SkIntToScalar(55);
126                paint.setColor(colorA);
127                const char* aTxt = invA ? "InverseA " : "A ";
128                canvas->drawText(aTxt, strlen(aTxt), txtX, SkIntToScalar(220), paint);
129                txtX += paint.measureText(aTxt, strlen(aTxt));
130                paint.setColor(SK_ColorBLACK);
131                canvas->drawText(gOps[op].fName, strlen(gOps[op].fName),
132                                    txtX, SkIntToScalar(220), paint);
133                txtX += paint.measureText(gOps[op].fName, strlen(gOps[op].fName));
134                paint.setColor(colorB);
135                canvas->drawText("B", 1, txtX, SkIntToScalar(220), paint);
136
137                canvas->translate(SkIntToScalar(250),0);
138            }
139        }
140        canvas->restore();
141    }
142
143    virtual SkView::Click* onFindClickHandler(SkScalar x, SkScalar y) {
144        this->inval(NULL);
145        return this->INHERITED::onFindClickHandler(x, y);
146    }
147private:
148    typedef SkView INHERITED;
149};
150
151//////////////////////////////////////////////////////////////////////////////
152
153static SkView* MyFactory() { return new ComplexClipView; }
154static SkViewRegister reg(MyFactory);
155
156