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/*
* Copyright 2013 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SampleCode.h"
#include "SkCanvas.h"
#include "SkPath.h"
// Reproduces https://code.google.com/p/chromium/issues/detail?id=279014
// Renders a string art shape.
// The particular shape rendered can be controlled by clicking horizontally, thereby
// generating an angle from 0 to 1.
class StringArtView : public SampleView {
public:
StringArtView() : fAngle(0.305f) {}
protected:
// overrides from SkEventSink
bool onQuery(SkEvent* evt) override {
if (SampleCode::TitleQ(*evt)) {
SampleCode::TitleR(evt, "StringArt");
return true;
}
return this->INHERITED::onQuery(evt);
}
void onDrawContent(SkCanvas* canvas) override {
SkScalar angle = fAngle*SK_ScalarPI + SkScalarHalf(SK_ScalarPI);
SkPoint center = SkPoint::Make(SkScalarHalf(this->width()), SkScalarHalf(this->height()));
SkScalar length = 5;
SkScalar step = angle;
SkPath path;
path.moveTo(center);
while (length < (SkScalarHalf(SkMinScalar(this->width(), this->height())) - 10.f))
{
SkPoint rp = SkPoint::Make(length*SkScalarCos(step) + center.fX,
length*SkScalarSin(step) + center.fY);
path.lineTo(rp);
length += angle / SkScalarHalf(SK_ScalarPI);
step += angle;
}
path.close();
SkPaint paint;
paint.setAntiAlias(true);
paint.setStyle(SkPaint::kStroke_Style);
paint.setColor(0xFF007700);
canvas->drawPath(path, paint);
}
SkView::Click* onFindClickHandler(SkScalar x, SkScalar y, unsigned) override {
fAngle = x/width();
this->inval(nullptr);
return nullptr;
}
private:
SkScalar fAngle;
typedef SampleView INHERITED;
};
//////////////////////////////////////////////////////////////////////////////
static SkView* MyFactory() { return new StringArtView; }
static SkViewRegister reg(MyFactory);
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