blob: ab7f6e14be4044e1ff33a2d8f58c446951d1fe1e [file] [log] [blame]
/*
* 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 "include/core/SkCanvas.h"
#include "include/core/SkPath.h"
#include "tools/viewer/ClickHandlerSlide.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 StringArtSlide : public ClickHandlerSlide {
public:
StringArtSlide() : fAngle(0.305f) { fName = "StringArt"; }
void load(SkScalar w, SkScalar h) override { fSize = {w, h}; }
void resize(SkScalar w, SkScalar h) override { fSize = {w, h}; }
void draw(SkCanvas* canvas) override {
SkScalar angle = fAngle*SK_ScalarPI + SkScalarHalf(SK_ScalarPI);
SkPoint center = SkPoint::Make(fSize.width()/2, fSize.height()/2);
SkScalar length = 5;
SkScalar step = angle;
SkPath path;
path.moveTo(center);
while (length < (std::min(fSize.width(), fSize.height())/2 - 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);
}
protected:
Click* onFindClickHandler(SkScalar x, SkScalar y, skui::ModifierKey) override {
fAngle = x/fSize.width();
return nullptr;
}
bool onClick(ClickHandlerSlide::Click *) override { return false; }
private:
SkScalar fAngle;
SkSize fSize;
};
//////////////////////////////////////////////////////////////////////////////
DEF_SLIDE( return new StringArtSlide(); )