package net.sf.latexdraw.glib.handlers;
import java.awt.geom.Rectangle2D;
import net.sf.latexdraw.glib.models.interfaces.shape.IArc;
import net.sf.latexdraw.glib.models.interfaces.shape.IPoint;
import net.sf.latexdraw.util.LNumber;
/**
* Defines a handler that changes the start/end angle of an arc.<br>
*<br>
* This file is part of LaTeXDraw<br>
* Copyright (c) 2005-2014 Arnaud BLOUIN<br>
*<br>
* LaTeXDraw is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.<br>
*<br>
* LaTeXDraw is distributed without any warranty; without even the
* implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
* PURPOSE. See the GNU General Public License for more details.<br>
* <br>
* 08/28/11<br>
* @author Arnaud BLOUIN<br>
* @version 3.0<br>
*/
public class ArcAngleHandler extends Handler<Rectangle2D, IArc> {
/** Defines if the handled angle is the starting or the ending angle. */
protected boolean start;
/**
* Creates and initialises an arc angle handler.
* @param isStart Defines if the handled angle is the starting or the ending angle.
* @since 3.0
*/
public ArcAngleHandler(final boolean isStart) {
super();
this.start = isStart;
shape = new Rectangle2D.Double();
updateShape();
}
@Override
protected void updateShape() {
shape.setFrame(point.getX()-size/2., point.getY()-size/2., size, size);
}
@Override
public void update(final IArc arc, final double zoom) {
if(arc==null) return;
final IPoint zoomedGC = arc.getGravityCentre().zoom(zoom);
final double rotAngle = arc.getRotationAngle();
IPoint pt;
if(start)
pt = arc.getStartPoint();
else
pt = arc.getEndPoint();
// If the shape is rotated, the handler's position must fit the rotation angle.
if(!LNumber.equalsDouble(rotAngle, 0.))
pt = pt.rotatePoint(zoomedGC, rotAngle);
point.setPoint(pt.zoom(zoom).getMiddlePoint(zoomedGC));
super.update(arc, zoom);
}
}