SamplePathFill.cpp revision ad89fbd3535cbbb528488c7a5ce98f88c57d2de3 
1#include "SampleCode.h"
2#include "SkView.h"
3#include "SkCanvas.h"
4#include "SkGraphics.h"
5#include "SkRandom.h"
6#include "SkBlurDrawLooper.h"
7#include "SkGradientShader.h"
8
9typedef SkScalar (*MakePathProc)(SkPath*);
10
11static SkScalar make_frame(SkPath* path) {
12    SkRect r = { 10, 10, 630, 470 };
13    path->addRoundRect(r, 15, 15);
14
15    SkPaint paint;
16    paint.setStyle(SkPaint::kStroke_Style);
17    paint.setStrokeWidth(5);
18    paint.getFillPath(*path, path);
19    return 15;
20}
21
22static SkScalar make_triangle(SkPath* path) {
23    static const int gCoord[] = {
24        10, 20, 15, 5, 30, 30
25    };
26    path->moveTo(SkIntToScalar(gCoord[0]), SkIntToScalar(gCoord[1]));
27    path->lineTo(SkIntToScalar(gCoord[2]), SkIntToScalar(gCoord[3]));
28    path->lineTo(SkIntToScalar(gCoord[4]), SkIntToScalar(gCoord[5]));
29    path->close();
30    path->offset(10, 0);
31    return SkIntToScalar(30);
32}
33
34static SkScalar make_rect(SkPath* path) {
35    SkRect r = { 10, 10, 30, 30 };
36    path->addRect(r);
37    path->offset(10, 0);
38    return SkIntToScalar(30);
39}
40
41static SkScalar make_oval(SkPath* path) {
42    SkRect r = { 10, 10, 30, 30 };
43    path->addOval(r);
44    path->offset(10, 0);
45    return SkIntToScalar(30);
46}
47
48static SkScalar make_sawtooth(SkPath* path) {
49    SkScalar x = SkIntToScalar(20);
50    SkScalar y = SkIntToScalar(20);
51    const SkScalar x0 = x;
52    const SkScalar dx = SK_Scalar1 * 5;
53    const SkScalar dy = SK_Scalar1 * 10;
54
55    path->moveTo(x, y);
56    for (int i = 0; i < 32; i++) {
57        x += dx;
58        path->lineTo(x, y - dy);
59        x += dx;
60        path->lineTo(x, y + dy);
61    }
62    path->lineTo(x, y + 2 * dy);
63    path->lineTo(x0, y + 2 * dy);
64    path->close();
65    return SkIntToScalar(30);
66}
67
68static SkScalar make_star(SkPath* path, int n) {
69    const SkScalar c = SkIntToScalar(45);
70    const SkScalar r = SkIntToScalar(20);
71
72    SkScalar rad = -SK_ScalarPI / 2;
73    const SkScalar drad = (n >> 1) * SK_ScalarPI * 2 / n;
74
75    path->moveTo(c, c - r);
76    for (int i = 1; i < n; i++) {
77        rad += drad;
78        SkScalar cosV, sinV = SkScalarSinCos(rad, &cosV);
79        path->lineTo(c + SkScalarMul(cosV, r), c + SkScalarMul(sinV, r));
80    }
81    path->close();
82    return r * 2 * 6 / 5;
83}
84
85static SkScalar make_star_5(SkPath* path) { return make_star(path, 5); }
86static SkScalar make_star_13(SkPath* path) { return make_star(path, 13); }
87
88static const MakePathProc gProcs[] = {
89    make_frame,
90    make_triangle,
91    make_rect,
92    make_oval,
93    make_sawtooth,
94    make_star_5,
95    make_star_13
96};
97
98#define N   SK_ARRAY_COUNT(gProcs)
99
100class PathFillView : public SkView {
101    SkPath  fPath[N];
102    SkScalar fDY[N];
103
104public:
105    PathFillView() {
106        for (size_t i = 0; i < N; i++) {
107            fDY[i] = gProcs[i](&fPath[i]);
108        }
109    }
110
111protected:
112    // overrides from SkEventSink
113    virtual bool onQuery(SkEvent* evt) {
114        if (SampleCode::TitleQ(*evt)) {
115            SampleCode::TitleR(evt, "PathFill");
116            return true;
117        }
118        return this->INHERITED::onQuery(evt);
119    }
120
121    void drawBG(SkCanvas* canvas) {
122        canvas->drawColor(0xFFDDDDDD);
123    }
124
125    virtual void onDraw(SkCanvas* canvas) {
126        this->drawBG(canvas);
127
128        SkPaint paint;
129        paint.setAntiAlias(true);
130
131        for (size_t i = 0; i < N; i++) {
132            canvas->drawPath(fPath[i], paint);
133            canvas->translate(0, fDY[i]);
134        }
135    }
136
137private:
138    typedef SkView INHERITED;
139};
140
141//////////////////////////////////////////////////////////////////////////////
142
143static SkView* MyFactory() { return new PathFillView; }
144static SkViewRegister reg(MyFactory);
145
146