/*
Copyright 2008-2010 Gephi
Authors : Jeremy Subtil <jeremy.subtil@gephi.org>
Website : http://www.gephi.org
This file is part of Gephi.
Gephi is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as
published by the Free Software Foundation, either version 3 of the
License, or (at your option) any later version.
Gephi is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with Gephi. If not, see <http://www.gnu.org/licenses/>.
*/
package org.gephi.preview;
import org.gephi.preview.api.Color;
import org.gephi.preview.api.EdgeArrow;
import org.gephi.preview.api.EdgeChildColorizerClient;
import org.gephi.preview.api.EdgeColorizerClient;
import org.gephi.preview.api.Point;
import org.gephi.preview.api.supervisors.DirectedEdgeSupervisor;
import org.gephi.preview.api.util.Holder;
import org.gephi.preview.util.HolderImpl;
import org.gephi.preview.util.Vector;
/**
* Implementation of an edge arrow.
*
* @author Jérémy Subtil <jeremy.subtil@gephi.org>
*/
public abstract class EdgeArrowImpl implements EdgeArrow, EdgeChildColorizerClient {
protected final DirectedEdgeImpl parent;
private final HolderImpl<Color> colorHolder = new HolderImpl<Color>();
protected PointImpl pt1, pt2, pt3;
protected NodeImpl refNode;
protected Vector direction;
protected float addedRadius;
protected static final float BASE_RATIO = 0.5f;
/**
* Constructor.
*
* @param parent the parent edge of the edge arrow
*/
public EdgeArrowImpl(DirectedEdgeImpl parent) {
this.parent = parent;
}
/**
* Returns the directed edge supervisor.
*
* @return the directed edge supervisor
*/
public DirectedEdgeSupervisor getDirectedEdgeSupervisor() {
return ((DirectedEdgeImpl) parent).getDirectedEdgeSupervisor();
}
/**
* Generates the edge arrow's position.
*/
public void genPosition() {
genAddedRadius();
genPt1(); // right angle point
genPt2(); // direction point on the edge
genPt3(); // last point (not on the edge)
}
public final Point getPt1() {
return pt1;
}
public final Point getPt2() {
return pt2;
}
public final Point getPt3() {
return pt3;
}
public Color getColor() {
return colorHolder.getComponent();
}
public EdgeColorizerClient getParentEdge() {
return parent;
}
public Holder<Color> getParentColorHolder() {
return parent.getColorHolder();
}
public void setColor(Color color) {
colorHolder.setComponent(color);
}
/**
* Generates the edge arrow's added radius.
*/
protected abstract void genAddedRadius();
/**
* Generates the edge arrow's first point.
*/
protected void genPt1() {
Vector v = new Vector(direction);
v.mult(addedRadius);
v.add(new Vector(refNode.getPosition()));
pt1 = new PointImpl(v);
}
/**
* Generates the edge arrow's second point.
*/
protected void genPt2() {
Vector v = new Vector(direction);
v.mult(getDirectedEdgeSupervisor().getArrowSize());
v.add(new Vector(pt1));
pt2 = new PointImpl(v);
}
/**
* Generates the edge arrow's third point.
*/
protected void genPt3() {
Vector v = new Vector(-direction.y, direction.x);
v.mult(BASE_RATIO * getDirectedEdgeSupervisor().getArrowSize());
v.add(new Vector(pt1));
pt3 = new PointImpl(v);
}
}