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(0);
35        canvas->save();
36        canvas->scale(1000 * SK_Scalar1, 1000 * SK_Scalar1);
37        SkRandom rand;
38        SkRandom randW;
39        SkPath curves;
40        SkPath hulls;
41        SkPath ctrlPts;
42        for (int i = 0; i < 100; ++i) {
43            SkScalar pts[] = {
44                rand.nextUScalar1(), rand.nextUScalar1(),
45                rand.nextUScalar1(), rand.nextUScalar1(),
46                rand.nextUScalar1(), rand.nextUScalar1(),
47                rand.nextUScalar1(), rand.nextUScalar1()
48            };
49            curves.moveTo(pts[0], pts[1]);
50            curves.cubicTo(pts[2], pts[3],
51                         pts[4], pts[5],
52                         pts[6], pts[7]);
53
54            hulls.moveTo(pts[0], pts[1]);
55            hulls.lineTo(pts[2], pts[3]);
56            hulls.lineTo(pts[4], pts[5]);
57            hulls.lineTo(pts[6], pts[7]);
58
59            ctrlPts.addCircle(pts[0], pts[1], SK_Scalar1 / 200);
60            ctrlPts.addCircle(pts[2], pts[3], SK_Scalar1 / 200);
61            ctrlPts.addCircle(pts[4], pts[5], SK_Scalar1 / 200);
62            ctrlPts.addCircle(pts[6], pts[7], SK_Scalar1 / 200);
63        }
64        for (int i = 0; i < 100; ++i) {
65            SkScalar pts[] = {
66                rand.nextUScalar1(), rand.nextUScalar1(),
67                rand.nextUScalar1(), rand.nextUScalar1(),
68                rand.nextUScalar1(), rand.nextUScalar1(),
69            };
70            curves.moveTo(pts[0], pts[1]);
71            curves.quadTo(pts[2], pts[3],
72                          pts[4], pts[5]);
73
74            hulls.moveTo(pts[0], pts[1]);
75            hulls.lineTo(pts[2], pts[3]);
76            hulls.lineTo(pts[4], pts[5]);
77
78            ctrlPts.addCircle(pts[0], pts[1], SK_Scalar1 / 200);
79            ctrlPts.addCircle(pts[2], pts[3], SK_Scalar1 / 200);
80            ctrlPts.addCircle(pts[4], pts[5], SK_Scalar1 / 200);
81        }
82        for (int i = 0; i < 100; ++i) {
83            SkScalar pts[] = {
84                rand.nextUScalar1(), rand.nextUScalar1(),
85                rand.nextUScalar1(), rand.nextUScalar1(),
86                rand.nextUScalar1(), rand.nextUScalar1(),
87            };
88            SkScalar weight = randW.nextUScalar1() * 2.0f;
89
90            curves.moveTo(pts[0], pts[1]);
91            curves.conicTo(pts[2], pts[3],
92                          pts[4], pts[5],
93                          weight);
94
95            hulls.moveTo(pts[0], pts[1]);
96            hulls.lineTo(pts[2], pts[3]);
97            hulls.lineTo(pts[4], pts[5]);
98
99            ctrlPts.addCircle(pts[0], pts[1], SK_Scalar1 / 200);
100            ctrlPts.addCircle(pts[2], pts[3], SK_Scalar1 / 200);
101            ctrlPts.addCircle(pts[4], pts[5], SK_Scalar1 / 200);
102        }
103        for (int i = 0; i < 100; ++i) {
104            SkScalar pts[] = {
105                rand.nextUScalar1(), rand.nextUScalar1(),
106                rand.nextUScalar1(), rand.nextUScalar1(),
107            };
108            curves.moveTo(pts[0], pts[1]);
109            curves.lineTo(pts[2], pts[3]);
110
111            ctrlPts.addCircle(pts[0], pts[1], SK_Scalar1 / 200);
112            ctrlPts.addCircle(pts[2], pts[3], SK_Scalar1 / 200);
113        }
114
115        paint.setColor(SK_ColorBLACK);
116        canvas->drawPath(curves, paint);
117        paint.setColor(SK_ColorRED);
118        //canvas->drawPath(hulls, paint);
119        paint.setStyle(SkPaint::kFill_Style);
120        paint.setColor(SK_ColorBLUE);
121        //canvas->drawPath(ctrlPts, paint);
122
123        canvas->restore();
124    }
125
126private:
127    typedef SampleView INHERITED;
128};
129
130//////////////////////////////////////////////////////////////////////////////
131
132static SkView* MyFactory() { return new HairCurvesView; }
133static SkViewRegister reg(MyFactory);
134