graphrouting.java

JGraph扩展应用。自定义Renderer,自定义视图View实现自定义工作流控件

package flow.graph.gui.graph;

import java.awt.geom.Point2D;
import java.awt.geom.Rectangle2D;
import java.util.ArrayList;
import java.util.List;

import org.jgraph.graph.CellView;
import org.jgraph.graph.EdgeView;
import org.jgraph.graph.PortView;
import org.jgraph.graph.DefaultEdge.LoopRouting;
public class GraphRouting extends LoopRouting {

	protected List routeEdge(EdgeView edge) {
		System.out.println("GraphRouting.....");
		List newPoints = new ArrayList();
		int n = edge.getPointCount();
		Point2D from = edge.getPoint(0);
		newPoints.add(from);
		if (edge.getSource() instanceof PortView) {
			newPoints.set(0, edge.getSource());
			from = ((PortView) edge.getSource()).getLocation();
		} else if (edge.getSource() != null) {
			Rectangle2D b = edge.getSource().getBounds();
			from = edge.getAttributes().createPoint(b.getCenterX(),
					b.getCenterY());
		}
		Point2D to = edge.getPoint(n - 1);
		CellView target = edge.getTarget();
		if (target instanceof PortView)
			to = ((PortView) target).getLocation();
		else if (target != null) {
			Rectangle2D b = target.getBounds();
			to = edge.getAttributes().createPoint(b.getCenterX(),
					b.getCenterY());
		}
		if (from != null && to != null) {
			Point2D[] routed;
			double dx = Math.abs(from.getX() - to.getX());
			double dy = Math.abs(from.getY() - to.getY());
			double x2 = from.getX() + ((to.getX() - from.getX()) / 2);
			double y2 = from.getY() + ((to.getY() - from.getY()) / 2);
			routed = new Point2D[2];
			if (dx > dy) {
				routed[0] = edge.getAttributes().createPoint(x2,
						from.getY());
				routed[1] = edge.getAttributes().createPoint(x2, to.getY());
			} else {
				routed[0] = edge.getAttributes().createPoint(from.getX(),
						y2);
				routed[1] = edge.getAttributes().createPoint(to.getX(), y2);
			}
			// Set/Add Points
			for (int i = 0; i < routed.length; i++)
				newPoints.add(routed[i]);

			// Add target point
			if (target != null)
				newPoints.add(target);
			else
				newPoints.add(to);
			return newPoints;
		}
		return null;
	}

}