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 "include/core/SkCanvas.h"
9#include "include/core/SkPath.h"
10#include "samplecode/Sample.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 Sample {
19public:
20    StringArtView() : fAngle(0.305f) {}
21
22protected:
23    SkString name() override { return SkString("StringArt"); }
24
25    void onDrawContent(SkCanvas* canvas) override {
26        SkScalar angle = fAngle*SK_ScalarPI + SkScalarHalf(SK_ScalarPI);
27
28        SkPoint center = SkPoint::Make(SkScalarHalf(this->width()), SkScalarHalf(this->height()));
29        SkScalar length = 5;
30        SkScalar step = angle;
31
32        SkPath path;
33        path.moveTo(center);
34
35        while (length < (SkScalarHalf(std::min(this->width(), this->height())) - 10.f))
36        {
37            SkPoint rp = SkPoint::Make(length*SkScalarCos(step) + center.fX,
38                                       length*SkScalarSin(step) + center.fY);
39            path.lineTo(rp);
40            length += angle / SkScalarHalf(SK_ScalarPI);
41            step += angle;
42        }
43        path.close();
44
45        SkPaint paint;
46        paint.setAntiAlias(true);
47        paint.setStyle(SkPaint::kStroke_Style);
48        paint.setColor(0xFF007700);
49
50        canvas->drawPath(path, paint);
51    }
52
53    Sample::Click* onFindClickHandler(SkScalar x, SkScalar y, skui::ModifierKey) override {
54        fAngle = x/width();
55        return nullptr;
56    }
57private:
58
59    SkScalar fAngle;
60    using INHERITED = Sample;
61};
62
63//////////////////////////////////////////////////////////////////////////////
64
65DEF_SAMPLE( return new StringArtView(); )
66