/*---

    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;

/**
   2D vector filed defined by a NURBS surface tangent in U.
   
   @author Satoru Sugihara
*/

public class I2DSurfaceVTangentField extends I2DField{
    public I2DSurfaceVTangentField(ISurfaceI srf){ super(new I2DSurfaceVTangentFieldGeo(srf)); }
    static public class I2DSurfaceVTangentFieldGeo extends I2DSurfaceFieldGeo{
	public I2DSurfaceVTangentFieldGeo(ISurfaceI srf){ super(srf,srf); }
	public IVec2I get(IVecI v, IVec2I uv){ return fieldSurface.vtan(uv).to2d(); }
    }
    
    public I2DSurfaceVTangentField noDecay(){ super.noDecay(); return this; }
    public I2DSurfaceVTangentField linearDecay(double threshold){ super.linearDecay(threshold); return this; }
    public I2DSurfaceVTangentField linear(double threshold){ super.linear(threshold); return this; }
    public I2DSurfaceVTangentField gaussianDecay(double threshold){ super.gaussianDecay(threshold); return this; }
    public I2DSurfaceVTangentField gaussian(double threshold){ super.gaussian(threshold); return this; }
    public I2DSurfaceVTangentField gauss(double threshold){ super.gauss(threshold); return this; }
    public I2DSurfaceVTangentField decay(IDecay decay, double threshold){ super.decay(decay,threshold); return this; }
    public I2DSurfaceVTangentField 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 I2DSurfaceVTangentField bidirectional(boolean b){ super.bidirectional(b); return this; }
    
    public I2DSurfaceVTangentField threshold(double t){ super.threshold(t); return this; }
    public I2DSurfaceVTangentField intensity(double i){ super.intensity(i); return this; }
    
}
