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
8#include "SampleCode.h"
9#include "SkAnimTimer.h"
10#include "SkCanvas.h"
11#include "SkColorFilter.h"
12#include "SkColorPriv.h"
13#include "SkCornerPathEffect.h"
14#include "SkDrawable.h"
15#include "SkGradientShader.h"
16#include "SkPath.h"
17#include "SkPathMeasure.h"
18#include "SkPictureRecorder.h"
19#include "SkRandom.h"
20#include "SkRegion.h"
21#include "SkShader.h"
22#include "SkString.h"
23#include "SkUtils.h"
24#include "SkView.h"
25#include "Sk1DPathEffect.h"
26
27#include "SkParsePath.h"
28static void testparse() {
29    SkRect r;
30    r.set(0, 0, 10, 10.5f);
31    SkPath p, p2;
32    SkString str, str2;
33
34    p.addRect(r);
35    SkParsePath::ToSVGString(p, &str);
36    SkParsePath::FromSVGString(str.c_str(), &p2);
37    SkParsePath::ToSVGString(p2, &str2);
38}
39
40class ArcsView : public SampleView {
41    class MyDrawable : public SkDrawable {
42        SkRect   fR;
43        SkScalar fSweep;
44    public:
45        MyDrawable(const SkRect& r) : fR(r), fSweep(0) {}
46
47        void setSweep(SkScalar sweep) {
48            if (fSweep != sweep) {
49                fSweep = sweep;
50                this->notifyDrawingChanged();
51            }
52        }
53
54        void onDraw(SkCanvas* canvas) override {
55            SkPaint paint;
56            paint.setAntiAlias(true);
57            paint.setStrokeWidth(SkIntToScalar(2));
58
59            paint.setStyle(SkPaint::kFill_Style);
60            paint.setColor(0x800000FF);
61            canvas->drawArc(fR, 0, fSweep, true, paint);
62
63            paint.setColor(0x800FF000);
64            canvas->drawArc(fR, 0, fSweep, false, paint);
65
66            paint.setStyle(SkPaint::kStroke_Style);
67            paint.setColor(SK_ColorRED);
68            canvas->drawArc(fR, 0, fSweep, true, paint);
69
70            paint.setStrokeWidth(0);
71            paint.setColor(SK_ColorBLUE);
72            canvas->drawArc(fR, 0, fSweep, false, paint);
73        }
74
75        SkRect onGetBounds() override {
76            SkRect r(fR);
77            r.outset(2, 2);
78            return r;
79        }
80    };
81
82public:
83    SkRect fRect;
84    sk_sp<MyDrawable> fAnimatingDrawable;
85    sk_sp<SkDrawable> fRootDrawable;
86
87    ArcsView() {
88        testparse();
89        fSweep = SkIntToScalar(100);
90        this->setBGColor(0xFFDDDDDD);
91
92        fRect.set(0, 0, SkIntToScalar(200), SkIntToScalar(200));
93        fRect.offset(SkIntToScalar(20), SkIntToScalar(20));
94        fAnimatingDrawable = sk_make_sp<MyDrawable>(fRect);
95
96        SkPictureRecorder recorder;
97        this->drawRoot(recorder.beginRecording(SkRect::MakeWH(800, 500)));
98        fRootDrawable = recorder.finishRecordingAsDrawable();
99    }
100
101protected:
102    // overrides from SkEventSink
103    bool onQuery(SkEvent* evt) override {
104        if (SampleCode::TitleQ(*evt)) {
105            SampleCode::TitleR(evt, "Arcs");
106            return true;
107        }
108        return this->INHERITED::onQuery(evt);
109    }
110
111    static void DrawRectWithLines(SkCanvas* canvas, const SkRect& r, const SkPaint& p) {
112        canvas->drawRect(r, p);
113        canvas->drawLine(r.fLeft, r.fTop, r.fRight, r.fBottom, p);
114        canvas->drawLine(r.fLeft, r.fBottom, r.fRight, r.fTop, p);
115        canvas->drawLine(r.fLeft, r.centerY(), r.fRight, r.centerY(), p);
116        canvas->drawLine(r.centerX(), r.fTop, r.centerX(), r.fBottom, p);
117    }
118
119    static void DrawLabel(SkCanvas* canvas, const SkRect& rect, SkScalar start, SkScalar sweep) {
120        SkPaint paint;
121
122        paint.setAntiAlias(true);
123        paint.setTextAlign(SkPaint::kCenter_Align);
124
125        SkString    str;
126
127        str.appendScalar(start);
128        str.append(", ");
129        str.appendScalar(sweep);
130        canvas->drawString(str, rect.centerX(),
131                         rect.fBottom + paint.getTextSize() * 5/4, paint);
132    }
133
134    static void DrawArcs(SkCanvas* canvas) {
135        SkPaint paint;
136        SkRect  r;
137        SkScalar w = 75;
138        SkScalar h = 50;
139
140        r.set(0, 0, w, h);
141        paint.setAntiAlias(true);
142        paint.setStyle(SkPaint::kStroke_Style);
143
144        canvas->save();
145        canvas->translate(SkIntToScalar(10), SkIntToScalar(300));
146
147        paint.setStrokeWidth(SkIntToScalar(1));
148
149        static const SkScalar gAngles[] = {
150            0, 360,
151            0, 45,
152            0, -45,
153            720, 135,
154            -90, 269,
155            -90, 270,
156            -90, 271,
157            -180, -270,
158            225, 90
159        };
160
161        for (size_t i = 0; i < SK_ARRAY_COUNT(gAngles); i += 2) {
162            paint.setColor(SK_ColorBLACK);
163            DrawRectWithLines(canvas, r, paint);
164
165            paint.setColor(SK_ColorRED);
166            canvas->drawArc(r, gAngles[i], gAngles[i+1], false, paint);
167
168            DrawLabel(canvas, r, gAngles[i], gAngles[i+1]);
169
170            canvas->translate(w * 8 / 7, 0);
171        }
172
173        canvas->restore();
174    }
175
176    void drawRoot(SkCanvas* canvas) {
177        SkPaint paint;
178        paint.setAntiAlias(true);
179        paint.setStrokeWidth(SkIntToScalar(2));
180        paint.setStyle(SkPaint::kStroke_Style);
181
182        DrawRectWithLines(canvas, fRect, paint);
183
184        canvas->drawDrawable(fAnimatingDrawable.get());
185
186        DrawArcs(canvas);
187    }
188
189    void onDrawContent(SkCanvas* canvas) override {
190        canvas->drawDrawable(fRootDrawable.get());
191    }
192
193    bool onAnimate(const SkAnimTimer& timer) override {
194        SkScalar angle = SkDoubleToScalar(fmod(timer.secs() * 360 / 24, 360));
195        fAnimatingDrawable->setSweep(angle);
196        return true;
197    }
198
199private:
200    SkScalar fSweep;
201
202    typedef SampleView INHERITED;
203};
204
205//////////////////////////////////////////////////////////////////////////////
206
207static SkView* MyFactory() { return new ArcsView; }
208static SkViewRegister reg(MyFactory);
209