pourcentcpu.java

这是一个在linux环境下

package fr.umlv.projet.fenetre.preformance;

import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import javax.swing.JPanel;

/**
 * The Panel to display the current percent of cpu used by the image sticks
 * it is contained in the Panel {@link fr.umlv.projet.fenetre.preformance.preformance Performance}.
 * @author HUANG Wei & MA Xiao Jun
 *
 */
public class PourcentCpu extends JPanel {
	private String pourcent = " ";
	private int pcGraph = 0;
	private int tot = 0;
	private int w = 0;
	private int h = 0;
	private int pc = 0;
	
	protected@Override void paintComponent(Graphics graphic){
		Graphics2D g = (Graphics2D)graphic; 
		super.paintComponent(g);
		this.setBackground(Color.BLACK);
		w = this.getWidth();
		h = this.getHeight();
		g.setBackground(Color.BLACK);
		g.setPaint(new Color(0, 50, 0));
		int y = h - 30;
		tot = y/6;
		int n = h - 30;
		for(int i = 0;i<tot;i++){
			g.fillRoundRect((int)(w*0.2),y,(int)(w*0.6),4,2,1);
			y = y - 6;
		}
		if(pc>=50 && pc<70)
			g.setColor(Color.YELLOW);
		else if(pc>=70 && pc<90)
			g.setColor(Color.ORANGE);
		else if(pc>=90)
			g.setColor(Color.RED);
		else
			g.setColor(Color.green);
		g.drawString(pourcent,(int)((w-pourcent.length()*7)/2),h-10);
		
		for(int j = 0;j<pcGraph;j++){
			g.fillRoundRect((int)(w*0.2),n,(int)(w*0.6),4,2,1);
			n = n - 6;
		}
	}
	/**
	 * to refresh the number of image sticks
	 * @param pc the percent of cpu used
	 * @param s here we use a character string to display the percent beacouse it is 
	 * 			easy to display the number contains decimal fraction
	 */
	public void refresh(int pc,String s){
		this. pc = pc;
		StringBuilder sb = new StringBuilder();
		sb.append(s).append(" ").append("%");
		pourcent = sb.toString();
		setPcGraph(pc);
	}
	
	/**
	 * to calculate the number of stick to display for showing the percent of Cpu used.
	 * @param pc the percent of Cpu used.
	 */
	public void setPcGraph(int pc){
		if(pc < 100)
			this.pcGraph = pc*tot/100+1;
		else
			this.pcGraph = pc*tot/100;
	}
}