1
2/*
3 * Copyright 2011 Google Inc.
4 *
5 * Use of this source code is governed by a BSD-style license that can be
6 * found in the LICENSE file.
7 */
8#include "SampleCode.h"
9#include "SkView.h"
10#include "SkCanvas.h"
11#include "SkPath.h"
12#include "SkRandom.h"
13
14class HairCurvesView : public SampleView {
15public:
16    HairCurvesView() {
17    }
18
19protected:
20    // overrides from SkEventSink
21    virtual bool onQuery(SkEvent* evt) {
22        if (SampleCode::TitleQ(*evt)) {
23            SampleCode::TitleR(evt, "HairCurves");
24            return true;
25        }
26        return this->INHERITED::onQuery(evt);
27    }
28
29
30    virtual void onDrawContent(SkCanvas* canvas) {
31        SkPaint paint;
32        paint.setAntiAlias(true);
33        paint.setStyle(SkPaint::kStroke_Style);
34        paint.setStrokeWidth(-1);
35        canvas->save();
36        canvas->scale(1000 * SK_Scalar1, 1000 * SK_Scalar1);
37        SkRandom rand;
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            };
86            curves.moveTo(pts[0], pts[1]);
87            curves.lineTo(pts[2], pts[3]);
88
89            ctrlPts.addCircle(pts[0], pts[1], SK_Scalar1 / 200);
90            ctrlPts.addCircle(pts[2], pts[3], SK_Scalar1 / 200);
91        }
92
93        paint.setColor(SK_ColorBLACK);
94        canvas->drawPath(curves, paint);
95        paint.setColor(SK_ColorRED);
96        //canvas->drawPath(hulls, paint);
97        paint.setStyle(SkPaint::kFill_Style);
98        paint.setColor(SK_ColorBLUE);
99        //canvas->drawPath(ctrlPts, paint);
100
101        canvas->restore();
102    }
103
104private:
105    typedef SampleView INHERITED;
106};
107
108//////////////////////////////////////////////////////////////////////////////
109
110static SkView* MyFactory() { return new HairCurvesView; }
111static SkViewRegister reg(MyFactory);
112
113