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#include "SampleCode.h"
8#include "SkCanvas.h"
9
10// Reproduces https://code.google.com/p/chromium/issues/detail?id=279014
11
12// Renders a string art shape.
13// The particular shape rendered can be controlled by clicking horizontally, thereby
14// generating an angle from 0 to 1.
15
16class StringArtView : public SampleView {
17public:
18    StringArtView() : fAngle(0.305f) {}
19
20protected:
21    // overrides from SkEventSink
22    bool onQuery(SkEvent* evt) override {
23        if (SampleCode::TitleQ(*evt)) {
24            SampleCode::TitleR(evt, "StringArt");
25            return true;
26        }
27        return this->INHERITED::onQuery(evt);
28    }
29
30    void onDrawContent(SkCanvas* canvas) override {
31        SkScalar angle = fAngle*SK_ScalarPI + SkScalarHalf(SK_ScalarPI);
32
33        SkPoint center = SkPoint::Make(SkScalarHalf(this->width()), SkScalarHalf(this->height()));
34        SkScalar length = 5;
35        SkScalar step = angle;
36
37        SkPath path;
38        path.moveTo(center);
39
40        while (length < (SkScalarHalf(SkMinScalar(this->width(), this->height())) - 10.f))
41        {
42            SkPoint rp = SkPoint::Make(length*SkScalarCos(step) + center.fX,
43                                       length*SkScalarSin(step) + center.fY);
44            path.lineTo(rp);
45            length += angle / SkScalarHalf(SK_ScalarPI);
46            step += angle;
47        }
48        path.close();
49
50        SkPaint paint;
51        paint.setAntiAlias(true);
52        paint.setStyle(SkPaint::kStroke_Style);
53        paint.setColor(0xFF007700);
54
55        canvas->drawPath(path, paint);
56    }
57
58    SkView::Click* onFindClickHandler(SkScalar x, SkScalar y, unsigned) override {
59        fAngle = x/width();
60        this->inval(NULL);
61        return NULL;
62    }
63private:
64
65    SkScalar fAngle;
66    typedef SampleView INHERITED;
67};
68
69//////////////////////////////////////////////////////////////////////////////
70
71static SkView* MyFactory() { return new StringArtView; }
72static SkViewRegister reg(MyFactory);
73