1/*
2 * Copyright 2013 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 "SkCanvas.h"
10#include "SkPath.h"
11
12// Reproduces https://code.google.com/p/chromium/issues/detail?id=279014
13
14// Renders a string art shape.
15// The particular shape rendered can be controlled by clicking horizontally, thereby
16// generating an angle from 0 to 1.
17
18class StringArtView : public SampleView {
19public:
20    StringArtView() : fAngle(0.305f) {}
21
22protected:
23    // overrides from SkEventSink
24    bool onQuery(SkEvent* evt) override {
25        if (SampleCode::TitleQ(*evt)) {
26            SampleCode::TitleR(evt, "StringArt");
27            return true;
28        }
29        return this->INHERITED::onQuery(evt);
30    }
31
32    void onDrawContent(SkCanvas* canvas) override {
33        SkScalar angle = fAngle*SK_ScalarPI + SkScalarHalf(SK_ScalarPI);
34
35        SkPoint center = SkPoint::Make(SkScalarHalf(this->width()), SkScalarHalf(this->height()));
36        SkScalar length = 5;
37        SkScalar step = angle;
38
39        SkPath path;
40        path.moveTo(center);
41
42        while (length < (SkScalarHalf(SkMinScalar(this->width(), this->height())) - 10.f))
43        {
44            SkPoint rp = SkPoint::Make(length*SkScalarCos(step) + center.fX,
45                                       length*SkScalarSin(step) + center.fY);
46            path.lineTo(rp);
47            length += angle / SkScalarHalf(SK_ScalarPI);
48            step += angle;
49        }
50        path.close();
51
52        SkPaint paint;
53        paint.setAntiAlias(true);
54        paint.setStyle(SkPaint::kStroke_Style);
55        paint.setColor(0xFF007700);
56
57        canvas->drawPath(path, paint);
58    }
59
60    SkView::Click* onFindClickHandler(SkScalar x, SkScalar y, unsigned) override {
61        fAngle = x/width();
62        this->inval(nullptr);
63        return nullptr;
64    }
65private:
66
67    SkScalar fAngle;
68    typedef SampleView INHERITED;
69};
70
71//////////////////////////////////////////////////////////////////////////////
72
73static SkView* MyFactory() { return new StringArtView; }
74static SkViewRegister reg(MyFactory);
75