spacefield.java

J2ME上的一个播放器,可以更换皮肤.开源软件.

package inline.ui.ce;

import inline.ui.*;
import java.util.*;
import javax.microedition.lcdui.*;


    public class SpaceField extends CanvasElement 
    {
	private static final int MAX_LINES = 23;
	
        public SpaceField(HostCanvas prnt, int x, int y, int w, int h)
        {
            super(prnt, x,y,w,h);
        }
        
        public SpaceField(HostCanvas prnt)
        {
            this(prnt, 0,0,0,0);
        }

	public void paintElement(Graphics g) 
        {
            synchronized (g) 
            {
		paintDeeply(g);
            }
        }
        
	private void paintDeeply(Graphics g) 
        {
	    Random rnd = new Random();

	    int pax = -100 + (rnd.nextInt()%42);
	    int pay = 40 + (rnd.nextInt()%40);

    	    int pbx = getWidth() + 100 + (rnd.nextInt()%42);
	    int pby = 50 + (rnd.nextInt()%40);

	    int pwx = pbx;
	    int pwy = (getHeight()-pay)*(pbx-pax)/-pax + pay;
	    
	    int pqx = pax;
	    int pqy = (getHeight()-pby)*(pbx-pax)/(pbx-getWidth()) + pby;
   
			    
	    for(int i=0;i<MAX_LINES;i++)
	    {
		// coef = 100...0
		// based on 1/x
		int coef = 101-(20000/(100*i/MAX_LINES+100)-100);

		// linear
		//coef = 100*(MAX_LINES-i)/MAX_LINES;
		
		g.setColor(getRampColor(coef));

		int pwly = i*(pwy-pby)/(MAX_LINES-i+1)/MAX_LINES;
		g.drawLine(pax,pay, pbx,pby+pwly);

		int pqly = i*(pqy-pay)/(MAX_LINES-i+1)/MAX_LINES;
		g.drawLine(pbx,pby, pax,pay+pqly);
		
	    }

	}

    }