1/*
2 * Copyright 2011 Google Inc.
3 *
4 * Use of this source code is governed by a BSD-style license that can be
5 * found in the LICENSE file.
6 */
7#include "SampleCode.h"
8#include "SkView.h"
9#include "SkCanvas.h"
10#include "SkPath.h"
11#include "SkRandom.h"
12
13class HairCurvesView : public SampleView {
14public:
15    HairCurvesView() {
16    }
17
18protected:
19    // overrides from SkEventSink
20    virtual bool onQuery(SkEvent* evt) {
21        if (SampleCode::TitleQ(*evt)) {
22            SampleCode::TitleR(evt, "HairCurves");
23            return true;
24        }
25        return this->INHERITED::onQuery(evt);
26    }
27
28
29    virtual void onDrawContent(SkCanvas* canvas) {
30        SkPaint paint;
31        paint.setAntiAlias(true);
32        paint.setStyle(SkPaint::kStroke_Style);
33        paint.setStrokeWidth(0);
34        canvas->save();
35        canvas->scale(1000 * SK_Scalar1, 1000 * SK_Scalar1);
36        SkRandom rand;
37        SkRandom randW;
38        SkPath curves;
39        SkPath hulls;
40        SkPath ctrlPts;
41        for (int i = 0; i < 100; ++i) {
42            SkScalar pts[] = {
43                rand.nextUScalar1(), rand.nextUScalar1(),
44                rand.nextUScalar1(), rand.nextUScalar1(),
45                rand.nextUScalar1(), rand.nextUScalar1(),
46                rand.nextUScalar1(), rand.nextUScalar1()
47            };
48            curves.moveTo(pts[0], pts[1]);
49            curves.cubicTo(pts[2], pts[3],
50                         pts[4], pts[5],
51                         pts[6], pts[7]);
52
53            hulls.moveTo(pts[0], pts[1]);
54            hulls.lineTo(pts[2], pts[3]);
55            hulls.lineTo(pts[4], pts[5]);
56            hulls.lineTo(pts[6], pts[7]);
57
58            ctrlPts.addCircle(pts[0], pts[1], SK_Scalar1 / 200);
59            ctrlPts.addCircle(pts[2], pts[3], SK_Scalar1 / 200);
60            ctrlPts.addCircle(pts[4], pts[5], SK_Scalar1 / 200);
61            ctrlPts.addCircle(pts[6], pts[7], SK_Scalar1 / 200);
62        }
63        for (int i = 0; i < 100; ++i) {
64            SkScalar pts[] = {
65                rand.nextUScalar1(), rand.nextUScalar1(),
66                rand.nextUScalar1(), rand.nextUScalar1(),
67                rand.nextUScalar1(), rand.nextUScalar1(),
68            };
69            curves.moveTo(pts[0], pts[1]);
70            curves.quadTo(pts[2], pts[3],
71                          pts[4], pts[5]);
72
73            hulls.moveTo(pts[0], pts[1]);
74            hulls.lineTo(pts[2], pts[3]);
75            hulls.lineTo(pts[4], pts[5]);
76
77            ctrlPts.addCircle(pts[0], pts[1], SK_Scalar1 / 200);
78            ctrlPts.addCircle(pts[2], pts[3], SK_Scalar1 / 200);
79            ctrlPts.addCircle(pts[4], pts[5], SK_Scalar1 / 200);
80        }
81        for (int i = 0; i < 100; ++i) {
82            SkScalar pts[] = {
83                rand.nextUScalar1(), rand.nextUScalar1(),
84                rand.nextUScalar1(), rand.nextUScalar1(),
85                rand.nextUScalar1(), rand.nextUScalar1(),
86            };
87            SkScalar weight = randW.nextUScalar1() * 2.0f;
88
89            curves.moveTo(pts[0], pts[1]);
90            curves.conicTo(pts[2], pts[3],
91                          pts[4], pts[5],
92                          weight);
93
94            hulls.moveTo(pts[0], pts[1]);
95            hulls.lineTo(pts[2], pts[3]);
96            hulls.lineTo(pts[4], pts[5]);
97
98            ctrlPts.addCircle(pts[0], pts[1], SK_Scalar1 / 200);
99            ctrlPts.addCircle(pts[2], pts[3], SK_Scalar1 / 200);
100            ctrlPts.addCircle(pts[4], pts[5], SK_Scalar1 / 200);
101        }
102        for (int i = 0; i < 100; ++i) {
103            SkScalar pts[] = {
104                rand.nextUScalar1(), rand.nextUScalar1(),
105                rand.nextUScalar1(), rand.nextUScalar1(),
106            };
107            curves.moveTo(pts[0], pts[1]);
108            curves.lineTo(pts[2], pts[3]);
109
110            ctrlPts.addCircle(pts[0], pts[1], SK_Scalar1 / 200);
111            ctrlPts.addCircle(pts[2], pts[3], SK_Scalar1 / 200);
112        }
113
114        paint.setColor(SK_ColorBLACK);
115        canvas->drawPath(curves, paint);
116        paint.setColor(SK_ColorRED);
117        //canvas->drawPath(hulls, paint);
118        paint.setStyle(SkPaint::kFill_Style);
119        paint.setColor(SK_ColorBLUE);
120        //canvas->drawPath(ctrlPts, paint);
121
122        canvas->restore();
123    }
124
125private:
126    typedef SampleView INHERITED;
127};
128
129//////////////////////////////////////////////////////////////////////////////
130
131static SkView* MyFactory() { return new HairCurvesView; }
132static SkViewRegister reg(MyFactory);
133