/**
 * dlentry.java - entry in a drawing list
 * Copyright (c) 1997 Will Ware, all rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    or its derived works must display the following acknowledgement:
 *      This product includes software developed by Will Ware.
 *
 * This software is provided "as is" and any express or implied warranties,
 * including, but not limited to, the implied warranties of merchantability
 * or fitness for any particular purpose are disclaimed. In no event shall
 * Will Ware be liable for any direct, indirect, incidental, special,
 * exemplary, or consequential damages (including, but not limited to,
 * procurement of substitute goods or services; loss of use, data, or
 * profits; or business interruption) however caused and on any theory of
 * liability, whether in contract, strict liability, or tort (including
 * negligence or otherwise) arising in any way out of the use of this
 * software, even if advised of the possibility of such damage.
 */

import java.awt.*;
import java.util.Vector;
import atom;

public class dlforce extends dlentry
{
  public static final String rcsid =
  "$Id: dlforce.java,v 1.5 1997/09/17 02:40:36 wware Exp $";
  private static Color force_color = Color.green;
  private double begin[], end[], orig[], f[], zval;
  private double forceMultiplier;
  private double arrowHeadSize = 5;
  private final static double sqrtHalf = Math.sqrt (0.5);
  public dlforce (double origin[], double f0[], view v)
  {
    int i;
    orig = new double[3];
    f = new double[3];
    vw = v;
    begin = v.xyzToScreen (origin);
    for (i = 0; i < 3; i++)
      {
	f[i] = f0[i];
	orig[i] = origin[i];
      }
    setForceMultiplier (10.0);
  }
  public void setForceMultiplier (double fm)
  {
    int i;
    end = new double[3];
    forceMultiplier = fm;
    for (i = 0; i < 3; i++)
      end[i] = orig[i] + f[i] * forceMultiplier;
    end = vw.xyzToScreen (end);
    zval = (begin[2] + end[2]) / 2;
  }
  public double zvalue ()
  {
    return zval;
  }
  public void quickpaint (Graphics g)
  {
    drawBondLine (g, force_color, force_color, begin, end);
    double[] u = new double[3];
    double[] v = new double[3];
    u[0] = end[1] - begin[1];
    u[1] = begin[0] - end[0];
    v[0] = end[0] - begin[0];
    v[1] = end[1] - begin[1];
    double m = Math.sqrt (u[0] * u[0] + u[1] * u[1]);
    if (m > arrowHeadSize)
      m = sqrtHalf * arrowHeadSize / m;
    else
      m = sqrtHalf;
    u[0] *= m;
    u[1] *= m;
    v[0] *= m;
    v[1] *= m;
    double m1 = Math.sqrt (u[0] * u[0] + u[1] * u[1]);
    g.setColor (force_color);
    g.drawLine (doubleToInt (end[0]),
		doubleToInt (end[1]),
		doubleToInt (end[0] + u[0] - v[0]),
		doubleToInt (end[1] + u[1] - v[1]));
    g.drawLine (doubleToInt (end[0]),
		doubleToInt (end[1]),
		doubleToInt (end[0] - u[0] - v[0]),
		doubleToInt (end[1] - u[1] - v[1]));
  }
  public void paint (Graphics g)
  {
    /* dumb for now, smarten it up later */
    quickpaint (g);
  }
}