/*
 * Created on Feb 28, 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.Color;

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

   /**
    * 
    */
   public DFInputPort(DFNode nd) {
      super(nd);
      
   }
   
   protected void drawArrow(float x0, float y0, float x1, float y1) {
      float o = y1 - y0;
      float a = x1 - x0;
      float theta = (float)Math.atan(o / a);
      //Offsets center the arrow at x1, y1, rather than placing its tip there
      float x1Offset = (float)((ARROW_LENGTH / 2) * Math.cos(theta));
      float y1Offset = (float)((ARROW_LENGTH / 2) * Math.sin(theta));
      
      reset();
      if (x1 > x0) {
         moveTo(x1 - x1Offset, y1 - y1Offset);
         lineTo((float)(x1 - x1Offset + (ARROW_LENGTH * Math.cos(theta + ARROW_WIDTH / 2))), (float)(y1 - y1Offset + (ARROW_LENGTH * Math.sin(theta + ARROW_WIDTH / 2))));
         lineTo((float)(x1 - x1Offset + (ARROW_LENGTH * Math.cos(theta - ARROW_WIDTH / 2))), (float)(y1 - y1Offset + (ARROW_LENGTH * Math.sin(theta - ARROW_WIDTH / 2))));
      }
      else {
         moveTo(x1 + x1Offset, y1 + y1Offset);
         lineTo((float)(x1 + x1Offset - (ARROW_LENGTH * Math.cos(theta + ARROW_WIDTH / 2))), (float)(y1 + y1Offset - (ARROW_LENGTH * Math.sin(theta + ARROW_WIDTH / 2))));
         lineTo((float)(x1 + x1Offset - (ARROW_LENGTH * Math.cos(theta - ARROW_WIDTH / 2))), (float)(y1 + y1Offset - (ARROW_LENGTH * Math.sin(theta - ARROW_WIDTH / 2))));
      }
      closePath();
      setPaint(Color.BLACK);
   }
}