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IParticleDirectionLink.java
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IParticleDirectionLink.java
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/*---
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;
import java.util.ArrayList;
/**
Class of an implementation of IDynamics to limit particles to be spacified direction from a center.
@author Satoru Sugihara
*/
public class IParticleDirectionLink extends IDynamicsBase{
public ArrayList<IParticleGeo> particles;
public IVecI center;
public IVec vel;
public IParticleDirectionLink(ArrayList<IParticleGeo> ptcls, IVecI cntr, IObject parent){
super(parent);
particles = ptcls;
center = cntr;
initParticleDirectionLink();
}
public IParticleDirectionLink(IParticleGeo[] ptcls, IVecI cntr, IObject parent){
super(parent);
particles = new ArrayList<IParticleGeo>();
for(int i=0; i<ptcls.length; i++) particles.add(ptcls[i]);
center = cntr;
initParticleDirectionLink();
}
public IParticleDirectionLink(IVecI cntr, IObject parent){
super(parent);
particles = new ArrayList<IParticleGeo>();
center = cntr;
initParticleDirectionLink();
}
public IParticleDirectionLink(ArrayList<IParticleGeo> ptcls, IVecI cntr){
super();
particles = ptcls;
center = cntr;
initParticleDirectionLink();
}
public IParticleDirectionLink(IParticleGeo[] ptcls, IVecI cntr){
super();
particles = new ArrayList<IParticleGeo>();
for(int i=0; i<ptcls.length; i++) particles.add(ptcls[i]);
center = cntr;
initParticleDirectionLink();
}
public IParticleDirectionLink(IVecI cntr){
super();
particles = new ArrayList<IParticleGeo>();
center = cntr;
initParticleDirectionLink();
}
public void initParticleDirectionLink(){
// to take control of location of particle;
for(int i=0; i<particles.size(); i++) particles.get(i).fix();
}
public void add(IParticleGeo p){
p.fix(); // to take control of location of particle;
particles.add(p);
}
//synchronized public void interact(ArrayList<IDynamicObject> dynamics){}
synchronized public void update(){
IVec moment = new IVec();
double inertia = 0;
double[] r2 = new double[particles.size()];
IVec[] dirs = new IVec[particles.size()];
IVec angularVec = new IVec();
for(int i=0; i<particles.size(); i++){
IParticleGeo p = particles.get(i);
dirs[i] = p.pos.diff(center);
moment.add(dirs[i].cross(p.frc));
r2[i] = dirs[i].len2();
inertia += p.mass*r2[i];
if(r2[i]>IConfig.tolerance) angularVec.add(dirs[i].cross(p.vel).div(r2[i]));
}
//moment.div(inertia);
angularVec.div(particles.size()); // average
angularVec.add(moment.mul(IConfig.updateRate/inertia));
IVec avrgDir=new IVec();
for(int i=0; i<particles.size(); i++){
IParticleGeo p = particles.get(i);
p.frc.projectToVec(dirs[i]);
p.frc.mul(IConfig.updateRate/p.mass); // only radial dir
p.vel.projectToVec(dirs[i]); // reset only to radial dir
p.vel.add(p.frc);
p.vel.add(angularVec.cross(dirs[i]));
p.vel.mul(1.0-p.friction);
p.pos.add(p.vel.dup().mul(IConfig.updateRate));
dirs[i] = p.pos.diff(center);
if(avrgDir.len()<IConfig.tolerance){
if(dirs[i].len()>IConfig.tolerance){ avrgDir.add(dirs[i]); }
}
else{
if(avrgDir.dot(dirs[i]) < 0) avrgDir.add(dirs[i], -1.0);
else avrgDir.add(dirs[i]);
}
}
if(avrgDir.len()<IConfig.tolerance){ avrgDir.set(0,0,1); } // default
for(int i=0; i<particles.size(); i++){
IParticleGeo p = particles.get(i);
//p.pos.set(p.pos.projectToLine(center, avrgDir));
p.pos.projectToLine(center, avrgDir);
//if(p.parent!=null) p.parent.updateGraphic();
p.updateTarget(); // necessary?
p.frc.zero();
}
//if(parent!=null) parent.updateGraphic();
//updateTarget();// moved to IDynamicsBase.postUpdate()
}
}