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Core visualization support for the JUNG project
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package edu.uci.ics.jung.visualization.control;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Shape;
import java.awt.geom.AffineTransform;
import java.awt.geom.CubicCurve2D;
import java.awt.geom.Point2D;
import edu.uci.ics.jung.visualization.BasicVisualizationServer;
import edu.uci.ics.jung.visualization.VisualizationServer;
import edu.uci.ics.jung.visualization.util.ArrowFactory;
public class CubicCurveEdgeEffects implements EdgeEffects {
protected CubicCurve2D rawEdge = new CubicCurve2D.Float();
protected Shape edgeShape;
protected Shape rawArrowShape;
protected Shape arrowShape;
protected VisualizationServer.Paintable edgePaintable;
protected VisualizationServer.Paintable arrowPaintable;
public CubicCurveEdgeEffects() {
this.rawEdge.setCurve(0.0f, 0.0f, 0.33f, 100, 0.66f, -50, 1.0f, 0.0f);
rawArrowShape = ArrowFactory.getNotchedArrow(20, 16, 8);
this.edgePaintable = new EdgePaintable();
this.arrowPaintable = new ArrowPaintable();
}
// @Override
public void startEdgeEffects(BasicVisualizationServer vv,
Point2D down, Point2D out) {
transformEdgeShape(down, out);
vv.addPostRenderPaintable(edgePaintable);
}
// @Override
public void midEdgeEffects(BasicVisualizationServer vv,
Point2D down, Point2D out) {
transformEdgeShape(down, out);
}
// @Override
public void endEdgeEffects(BasicVisualizationServer vv) {
vv.removePostRenderPaintable(edgePaintable);
}
// @Override
public void startArrowEffects(BasicVisualizationServer vv,
Point2D down, Point2D out) {
transformArrowShape(down, out);
vv.addPostRenderPaintable(arrowPaintable);
}
// @Override
public void midArrowEffects(BasicVisualizationServer vv,
Point2D down, Point2D out) {
transformArrowShape(down, out);
}
// @Override
public void endArrowEffects(BasicVisualizationServer vv) {
vv.removePostRenderPaintable(arrowPaintable);
}
/**
* code lifted from PluggableRenderer to move an edge shape into an
* arbitrary position
*/
private void transformEdgeShape(Point2D down, Point2D out) {
float x1 = (float) down.getX();
float y1 = (float) down.getY();
float x2 = (float) out.getX();
float y2 = (float) out.getY();
AffineTransform xform = AffineTransform.getTranslateInstance(x1, y1);
float dx = x2-x1;
float dy = y2-y1;
float thetaRadians = (float) Math.atan2(dy, dx);
xform.rotate(thetaRadians);
float dist = (float) Math.sqrt(dx*dx + dy*dy);
xform.scale(dist / rawEdge.getBounds().getWidth(), 1.0);
edgeShape = xform.createTransformedShape(rawEdge);
}
private void transformArrowShape(Point2D down, Point2D out) {
float x1 = (float) down.getX();
float y1 = (float) down.getY();
float x2 = (float) out.getX();
float y2 = (float) out.getY();
AffineTransform xform = AffineTransform.getTranslateInstance(x2, y2);
float dx = x2-x1;
float dy = y2-y1;
float thetaRadians = (float) Math.atan2(dy, dx);
xform.rotate(thetaRadians);
arrowShape = xform.createTransformedShape(rawArrowShape);
}
/**
* Used for the edge creation visual effect during mouse drag
*/
class EdgePaintable implements VisualizationServer.Paintable {
public void paint(Graphics g) {
if(edgeShape != null) {
Color oldColor = g.getColor();
g.setColor(Color.black);
((Graphics2D)g).draw(edgeShape);
g.setColor(oldColor);
}
}
public boolean useTransform() {
return false;
}
}
/**
* Used for the directed edge creation visual effect during mouse drag
*/
class ArrowPaintable implements VisualizationServer.Paintable {
public void paint(Graphics g) {
if(arrowShape != null) {
Color oldColor = g.getColor();
g.setColor(Color.black);
((Graphics2D)g).fill(arrowShape);
g.setColor(oldColor);
}
}
public boolean useTransform() {
return false;
}
}
}
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