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Contents
/*
* __ .__ .__ ._____.
* _/ |_ _______ __|__| ____ | | |__\_ |__ ______
* \ __\/ _ \ \/ / |/ ___\| | | || __ \ / ___/
* | | ( <_> > <| \ \___| |_| || \_\ \\___ \
* |__| \____/__/\_ \__|\___ >____/__||___ /____ >
* \/ \/ \/ \/
*
* Copyright (c) 2006-2011 Karsten Schmidt
*
* 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.
*
* http://creativecommons.org/licenses/LGPL/2.1/
*
* 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
*/
package toxi.physics2d;
/**
* Creates a pullback spring (default restlength=0.5) between 2 particles and
* locks the first one given at the current position. The spring is only
* enforced if the current length of the spring exceeds the rest length. This
* behaviour is the opposite to the {@link VerletMinDistanceSpring2D}.
*/
class PullBackSpring2D extends VerletSpring2D {
public PullBackSpring2D(VerletParticle2D a, VerletParticle2D b,
float strength) {
super(a, b, 0, strength);
a.lock();
setRestLength(0.5f);
}
@Override
protected void update(boolean applyConstraints) {
if (b.distanceToSquared(a) > restLengthSquared) {
super.update(applyConstraints);
}
}
}
Version data entries
11 entries across 11 versions & 1 rubygems