/* * __ .__ .__ ._____. * _/ |_ _______ __|__| ____ | | |__\_ |__ ______ * \ __\/ _ \ \/ / |/ ___\| | | || __ \ / ___/ * | | ( <_> > <| \ \___| |_| || \_\ \\___ \ * |__| \____/__/\_ \__|\___ >____/__||___ /____ > * \/ \/ \/ \/ * * 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.behaviors; import toxi.geom.SpatialIndex; import toxi.geom.Vec2D; import toxi.physics2d.VerletParticle2D; /** * * @author tux */ public class ConstantForceBehavior2D implements ParticleBehavior2D { /** * */ protected Vec2D force; /** * */ protected Vec2D scaledForce = new Vec2D(); /** * */ protected float timeStep; /** * * @param force */ public ConstantForceBehavior2D(Vec2D force) { this.force = force; } @Override public void apply(VerletParticle2D p) { p.addForce(scaledForce); } /** * * @param spaceHash */ @Override public void applyWithIndex(SpatialIndex spaceHash) { throw new UnsupportedOperationException("not implemented"); } /** * * @param timeStep */ @Override public void configure(float timeStep) { this.timeStep = timeStep; setForce(force); } /** * @return the force */ public Vec2D getForce() { return force; } /** * @param force * the force to set */ public void setForce(Vec2D force) { this.force = force; this.scaledForce = force.scale(timeStep); } /** * * @return */ @Override public boolean supportsSpatialIndex() { return false; } }