PhaseSpacePanel.java

package org.openpixi.pixi.ui.panel;

import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;

import org.openpixi.pixi.physics.Simulation;
import org.openpixi.pixi.physics.particles.Particle;
import org.openpixi.pixi.ui.SimulationAnimation;

/**
 * This panel shows the one-dimensional phase space (x vs. vx).
 */
public class PhaseSpacePanel extends AnimationPanel {

	/** Constructor */
	public PhaseSpacePanel(SimulationAnimation simulationAnimation) {
		super(simulationAnimation);
	}

	/** Display the particles */
	public void paintComponent(Graphics graph1) {
		Graphics2D graph = (Graphics2D) graph1;
		setBackground(Color.white);
		graph.translate(0, this.getHeight());
		graph.scale(1, -1);

		super.paintComponent(graph1);

		// scale factor for velocity
		double scaleV = .5;

		Simulation s = getSimulationAnimation().getSimulation();
		/** Scaling factor for the displayed panel in x-direction*/
		double sx = getWidth() / s.getWidth();
		/** Scaling factor for the displayed panel in y-direction*/
		double sy = getHeight() / s.getHeight();

		double panelHeight = getHeight();

		for (int i = 0; i < s.particles.size(); i++) {
			Particle par = (Particle) s.particles.get(i);
			graph.setColor(par.getColor());
			double radius = par.getRadius();
			int width = (int) (2*sx*radius);
			int height = (int) (2*sy*radius);
			double position = (0.5 + scaleV * par.getVx() ) * panelHeight;
			if(width > 2 && height > 2) {
				graph.fillOval((int) (par.getX()*sx) - width/2, (int) position - height/2,  width,  height);
			}
			else {
				graph.drawRect((int) (par.getX()*sx), (int) position, 0, 0);
			}
		}

	}


}