/* jCAE stand for Java Computer Aided Engineering. Features are : Small CAD
modeler, Finite element mesher, Plugin architecture.
Copyright (C) 2009, by EADS France
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
package org.jcae.mesh.amibe.metrics;
public final class EuclidianMetric3D implements Metric
{
private final double [] unit_bounds = new double[]{1.0, 1.0, 1.0};
private final double scale;
public EuclidianMetric3D()
{
scale = 1.0;
}
public EuclidianMetric3D(double s)
{
scale = 1.0 / (s*s);
unit_bounds[0] = unit_bounds[1] = unit_bounds[2] = s;
}
/**
* Return 3D Euclidian square distance between two points.
*
* @param p1 coordinates of the first node
* @param p2 coordinates of the second node
* @return 3D Euclidian square distance between these two points.
*/
@Override
public double distance2(Location p1, Location p2)
{
double dx = p1.getX() - p2.getX();
double dy = p1.getY() - p2.getY();
double dz = p1.getZ() - p2.getZ();
return scale * (dx * dx + dy * dy + dz * dz);
}
/**
* Return triplet <code>(1, 1, 1)</code>.
*
* @return a double[3] array with values <code>(1, 1, 1)</code>
*/
public double [] getUnitBallBBox()
{
return unit_bounds;
}
}