/*---

    iGeo - http://igeo.jp

    Copyright (c) 2002-2013 Satoru Sugihara

    This file is part of iGeo.

    iGeo 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, version 3.

    iGeo 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 iGeo.  If not, see <http://www.gnu.org/licenses/>.

---*/

package igeo;


/**
   Attractor field defined by a center point.
   
   @author Satoru Sugihara
*/

public class IAttractorGeo extends IPointFieldGeo{
    public IAttractorGeo(IVecI p){ super(p,null); }
    public IVecI getForce(IVecI v, IVecI orig){ return orig.dif(v); }
        
    public IAttractorGeo noDecay(){ super.noDecay(); return this; }
    public IAttractorGeo linearDecay(double threshold){ super.linearDecay(threshold); return this; }
    public IAttractorGeo linear(double threshold){ super.linear(threshold); return this; }
    public IAttractorGeo gaussianDecay(double threshold){ super.gaussianDecay(threshold); return this; }
    public IAttractorGeo gaussian(double threshold){ super.gaussian(threshold); return this; }
    public IAttractorGeo gauss(double threshold){ super.gauss(threshold); return this; }
    public IAttractorGeo constantIntensity(boolean b){ super.constantIntensity(b); return this; }
    /** if bidirectional is on, field force vector is flipped when velocity of particle is going opposite */
    public IAttractorGeo bidirectional(boolean b){ super.bidirectional(b); return this; }
    
    public IAttractorGeo threshold(double t){ super.threshold(t); return this; }
    public IAttractorGeo intensity(double i){ super.intensity(i); return this; }
}
