/*
* OpenPixi - Open Particle-In-Cell (PIC) Simulator
* Copyright (C) 2012 OpenPixi.org
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
package org.openpixi.pixi.physics.particles;
import java.util.List;
import java.util.ArrayList;
/**
* Iterates through the particle factories creating the appropriate amount of particles of
* a specify type. Then modifies the positions and velocities of these particle groups according
* to the specified position and velocity distributions.
*/
public class ParticleLoader {
public List<Particle> load(List<ParticleFactory> particleFactories, double simulationWidth,
double simulationHeight, int numCellsX, int numCellsY) throws IllegalArgumentException {
List<Particle> particles = new ArrayList<Particle>();
/** Starting index of a block of similar particles in the particle list */
int index = 0;
for(ParticleFactory f : particleFactories) {
for(int i = 0; i < f.getNumberOfInstances(); i++) {
particles.add(f.createParticle());
}
switch(f.getPositionDistribution()) {
case RANDOM: {
RandomPositionDistribution.apply(particles, index, index + f.getNumberOfInstances(),
0, simulationHeight, 0, simulationWidth, f.getSeedForRandom1());
break;
}
case CONSTANT_SPACING: {
ConstantSpacingDistribution.apply(particles, index, index + f.getNumberOfInstances(),
0, simulationWidth, 0, simulationHeight);
break;
}
default: {
throw new IllegalArgumentException("Can't yet handle " + f.getPositionDistribution());
}
}
switch(f.getVelocityDistribution()) {
case NONE: {
// THIS IS FOR IMMOBILE PARTICLES!
// If the particle has a velocity variable this SHOULD NOT BE USED!
break;
}
case CONSTANT: {
ConstantVelocityDistribution.apply(particles, index, index + f.getNumberOfInstances(),
f.getVelocityParameter1(), f.getVelocityParameter2());
break;
}
case RANDOM: {
RandomVelocityDistribution.apply(particles, index, index + f.getNumberOfInstances(),
f.getVelocityParameter1(), f.getVelocityParameter2(), f.getVelocityParameter3(),
f.getSeedForRandom2());
}
case MAXWELLIAN: {
MaxwellianDistribution.apply(particles, index, index + f.getNumberOfInstances(),
f.getVelocityParameter1(), f.getVelocityParameter2(), f.getSeedForRandom2());
break;
}
case MAXWELLIAN_WITH_CUTOFF: {
MaxwellianDistribution.applyWithCutoff(particles, index,
index + f.getNumberOfInstances(), f.getVelocityParameter1(),
f.getVelocityParameter2(), f.getVelocityParameter3(), f.getSeedForRandom2());
break;
}
default: {
throw new IllegalArgumentException("Can't yet handle " + f.getVelocityDistribution());
}
}
index += f.getNumberOfInstances();
f = null;
}
return particles;
}
}