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package org.cristalise.gui.graph.view;
import java.awt.Graphics2D;
import java.awt.Paint;
import java.awt.Shape;
import java.awt.geom.AffineTransform;
import java.awt.geom.GeneralPath;
import org.cristalise.kernel.graph.model.DirectedEdge;
import org.cristalise.kernel.graph.model.GraphPoint;
public class DefaultDirectedEdgeRenderer implements DirectedEdgeRenderer
{
private GeneralPath mArrowTemplate = new GeneralPath();
private Paint mLinePaint = null;
public DefaultDirectedEdgeRenderer(Paint linePaint)
{
mLinePaint = linePaint;
mArrowTemplate.moveTo(-5, 5);
mArrowTemplate.lineTo( 0, 0);
mArrowTemplate.lineTo( 5, 5);
}
@Override
public void draw(Graphics2D g2d, DirectedEdge directedEdge)
{
GraphPoint originPoint = directedEdge.getOriginPoint();
GraphPoint terminusPoint = directedEdge.getTerminusPoint();
GraphPoint midPoint = new GraphPoint();
AffineTransform transform = new AffineTransform();
Shape arrow = null;
g2d.setPaint(mLinePaint);
g2d.drawLine(originPoint.x, originPoint.y, terminusPoint.x, terminusPoint.y);
midPoint.x = originPoint.x + (terminusPoint.x - originPoint.x)/2;
midPoint.y = originPoint.y + (terminusPoint.y - originPoint.y)/2;
transform.translate(midPoint.x, midPoint.y);
transform.rotate(calcArrowAngle(originPoint.x, originPoint.y, terminusPoint.x, terminusPoint.y));
arrow = mArrowTemplate.createTransformedShape(transform);
g2d.draw(arrow);
}
private static double calcArrowAngle(int originX, int originY, int terminusX, int terminusY) {
double width = terminusX - originX;
double height = terminusY - originY;
if((width == 0) && (height > 0)) return Math.PI;
if((width == 0) && (height < 0)) return 0;
if((width > 0) && (height == 0)) return Math.PI/2.0;
if((width < 0) && (height == 0)) return -1.0 * Math.PI/2.0;
if((width > 0) && (height > 0)) return Math.PI/2.0 + Math.atan(Math.abs(height)/Math.abs(width));
if((width > 0) && (height < 0)) return Math.atan(Math.abs(width)/Math.abs(height));
if((width < 0) && (height < 0)) return -1.0 * Math.atan(Math.abs(width)/Math.abs(height));
if((width < 0) && (height > 0)) return -1.0 * (Math.PI/2.0 + Math.atan(Math.abs(height)/Math.abs(width)));
return 0.0;
}
}
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