/*
 * Created on Mar 6, 2006
 *
 * TODO To change the template for this generated file go to
 * Window - Preferences - Java - Code Style - Code Templates
 */
package implementation.source.java.nodes;

import java.awt.geom.Point2D;

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

   final int ARROW_LENGTH = 10;
   final double ARROW_WIDTH = Math.PI / 3;
   DFNode node;
   Point2D.Double position;
   DFLabel label;
   DFEdge edge;
   boolean externalPort;
   
   /**
    * 
    */
   public DFPort(DFNode nd) {
      super();
      node = nd;
      node.addChild(this);
      position = new Point2D.Double(node.getX() + node.getWidth(),
         node.getY() + (node.getHeight() / 2));
      drawPort();
      label = new DFLabel("A port");
      label.setX(getX());
      label.setY(getY() + getHeight());
      externalPort = false;
   }
   
   public void showLabel(boolean show) {
      if (show) {
         if (!getChildrenReference().contains(label)) {
            addChild(label);
         }
      }
      else {
         if (getChildrenReference().contains(label)) {
            removeChild(label);
         }
      }
   }
   
   public void drawPort() {
      drawArrow((float)(node.getX() + (node.getWidth() / 2)), 
         (float)(node.getY() + (node.getHeight() / 2)), 
         (float)position.x,
         (float)position.y);
   }
   
   protected abstract void drawArrow(float x0, float y0, float x1, float y1);
   
   public DFNode getNode() {return node;}
   
   public void updatePosition(float x, float y) {
      float x0 = (float)node.getX() + (float)node.getWidth() / 2;
      float y0 = (float)node.getY() + (float)node.getHeight() / 2;
      float o = y - y0;
      float a = x - x0;
      double h = Math.sqrt(Math.pow(a, 2) + Math.pow(o, 2));
      if (h == 0) {
         return;
      }
      double xPos = ((node.getWidth() / 2) * (a / h));
      double yPos = ((node.getHeight() / 2) * (o / h));
      position.x = node.getX() + (node.getWidth() / 2) + xPos;
      position.y = node.getY() + (node.getHeight() / 2) + yPos;
      setX(position.x);
      setY(position.y);
      drawPort();
   }
   
   public void setEdge(DFEdge e) {edge = e;}
   
   public DFEdge getEdge() {return edge;}
   
   public void setLabel(String s) {label.setText(s);}
   
   public String getLabel() {return label.getText();}
   
   public void setOutputPort(boolean s) {externalPort = s;}
   
   public boolean isOutputPort() {return externalPort;}
}