/*******************************************************************************
 * Copyright (c) 2001, 2006 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.wst.xsd.ui.internal.adt.design.editparts;

import org.eclipse.draw2d.AbstractConnectionAnchor;
import org.eclipse.draw2d.IFigure;
import org.eclipse.draw2d.geometry.Point;
import org.eclipse.draw2d.geometry.Rectangle;
import org.eclipse.wst.xsd.ui.internal.design.figures.CenteredIconFigure;

public class CenteredConnectionAnchor extends AbstractConnectionAnchor
{
  public static final int TOP = 0;
  public static final int BOTTOM = 1;
  public static final int LEFT = 2;
  public static final int RIGHT = 3;

  public static final int HEADER_LEFT = 4;
  public static final int HEADER_RIGHT = 5;

  private int location;
  private int inset;
  private int offset = 0;
  private CenteredConnectionAnchor other;

  public CenteredConnectionAnchor(IFigure owner, int location, int inset)
  {
    super(owner);
    this.location = location;
    this.inset = inset;
  }

  public CenteredConnectionAnchor(IFigure owner, int location, int inset, int offset)
  {
    this(owner, location, inset);
    this.offset = offset;
  }

  public Point getLocation(Point reference)
  {
    Rectangle r = getOwner().getBounds();
    int x, y;
    switch (location)
    {
    case TOP:
      x = r.right() - r.width / 2 + offset;
      y = r.y + inset;
      break;
    case BOTTOM:
      x = r.right() - r.width / 2 + offset;
      y = r.bottom() - inset;
      break;
    case LEFT:
      x = r.x + inset;
      y = r.bottom() - r.height / 2 + offset;
      break;
    case RIGHT:
      x = r.right() - inset;
      y = r.bottom() - r.height / 2 + offset;
      break;
    case HEADER_LEFT:
      x = r.x + inset;
      y = r.y + offset;
      break;
    case HEADER_RIGHT:
      x = r.right() - inset;
      y = r.y + offset;
      break;

    default:
      x = r.right() - r.width / 2;
      y = r.bottom() - r.height / 2;
    }
    Point p = new Point(x, y);

    if (!(getOwner() instanceof CenteredIconFigure))
    {
      getOwner().translateToAbsolute(p);
    }
    else
    {
      getOwner().translateToAbsolute(p);
    }
    
    if (other != null)
    {
      // if within only one pixel of being vertical, we straighten up the line
      Point p2 = other.getLocation(null);
      if (Math.abs(p2.x - p.x) <= 1)
      {
        p.x = p2.x;
      }  
    }  
    return p;
  }

  public Point getReferencePoint()
  {
    return getLocation(null);
  }

  public void setOther(CenteredConnectionAnchor other)
  {
    this.other = other;
  }

}