package implementation.source.java.nodes;

import edu.umd.cs.piccolo.event.PInputEvent;
import edu.umd.cs.piccolo.util.PDimension;
import edu.umd.cs.piccolox.handles.PHandle;
/*
 * Created on Jan 24, 2006
 *
 * TODO To change the template for this generated file go to
 * Window - Preferences - Java - Code Style - Code Templates
 */

/**
 * @author Timothy Ober
 *
 * TODO To change the template for this generated type comment go to
 * Window - Preferences - Java - Code Style - Code Templates
 */
public class DFEdgeEndpointHandle extends PHandle {

   DFEdge edge;
   DFEndpoint node;
   DFEndpoint oppositeNode;
   double xPos;
   double yPos;
   /**
    * @param arg0
    */
   public DFEdgeEndpointHandle(SetXYLocator l, DFEdge e, DFEndpoint n) {
      super(l);
      edge = e;
      node = n;
      if (n == edge.getEndFrom()) {
         oppositeNode = edge.getEndTo();
      }
      else {
         oppositeNode = edge.getEndFrom();
      }
      double x = oppositeNode.getX() + oppositeNode.getWidth() / 2;
      double y = oppositeNode.getY() + oppositeNode.getHeight() / 2;
      double a = x - node.getX() + node.getWidth() / 2;
      double o = y - node.getY() + node.getHeight() / 2;
      double h = Math.sqrt(Math.pow(a, 2) + Math.pow(o, 2));
      if (h == 0) {
         return;
      }
      SetXYLocator loc = (SetXYLocator)getLocator();
      xPos = ((node.getWidth() / 2) * (a / h));
      yPos = ((node.getWidth() / 2) * (o / h));
      loc.setX(node.getX() + (node.getWidth() / 2) + xPos);
      loc.setY(node.getY() + (node.getHeight() / 2) + yPos);
      relocateHandle();
   }
   
   public void dragHandle(PDimension aLocalDimension, PInputEvent aEvent) {
      double x = aEvent.getPosition().getX();
      double y = aEvent.getPosition().getY();
      double a = x - (node.getX() + node.getWidth() / 2);
      double o = y - (node.getY() + node.getHeight() / 2);
      double h = Math.sqrt(Math.pow(a, 2) + Math.pow(o, 2));
      if (h == 0) {
         return;
      }
      SetXYLocator loc = (SetXYLocator)getLocator();
      xPos = ((node.getWidth() / 2) * (a / h));
      yPos = ((node.getHeight() / 2) * (o / h));
      loc.setX(node.getX() + (node.getWidth() / 2) + xPos);
      loc.setY(node.getY() + (node.getHeight() / 2) + yPos);
      relocateHandle();
      edge.reset();
      edge.drawEdge();
   }
   
   public void updateHandleLocation() {
      SetXYLocator loc = (SetXYLocator)getLocator();
      loc.setX(node.getBounds().getCenterX() + xPos);
      loc.setY(node.getBounds().getCenterY() + yPos);
      relocateHandle();
      edge.reset();
      edge.drawEdge();
   }
}