route.java

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/*********************************************************************
%   File   : Route.java
%   Author : Neng-Fa ZHOU
%   Date   : 1998
%   Purpose: Java part of a multi-layer channel router
*********************************************************************/
import java.awt.*;
import java.awt.event.*;
import java.util.*;
import java.applet.*;
import bprolog.plc.Plc;

public 
class Route extends Applet {
    int maxComps = 100;
    public int screenWidth=600;
    public int screenHeight=400;
    public Hashtable ht;
    DJComponent[] comps = new DJComponent[maxComps];
    DJComponent comp;
    int noComps = 0;
    Color color = Color.black;

    public static void main(String args[]) {
        Frame f = new Frame("Route");
        f.addWindowListener(new WindowAdapter(){
	              public void windowClosing(WindowEvent e){
			    System.exit(0);
       		      }});
	Route dj = new Route();
        dj.init();
        f.add("Center",dj);
        f.setSize(dj.screenWidth,dj.screenHeight);
        f.show();
	dj.run();
	System.exit(0);
    }

    public void init(){
        initializeHashtable();
    }
	
    public void run() {
	Plc.startPlc(new String []{});
	Plc goal = new Plc("go", new Object[] {this});
        Plc.exec("load('route')");
	goal.call();
	while (true);
    }

   void initializeHashtable(){
        ht = new Hashtable(13);

     	ht.put("black",Color.black);
	ht.put("blue",Color.blue);
    	ht.put("cyan",Color.cyan);
	ht.put("darkGray",Color.darkGray);
	ht.put("gray",Color.gray);
	ht.put("green",Color.green);
        ht.put("lightGray",Color.lightGray);
	ht.put("magenta",Color.magenta);
	ht.put("orange",Color.orange);
	ht.put("pink",Color.pink);
	ht.put("red",Color.red);
	ht.put("white",Color.white);
	ht.put("yellow",Color.yellow);
   }

    public void paint(Graphics g){
        for (int i=0;i<noComps;i++)  comps[i].draw();
    }

   void expandCompsIfNecessary(){
        DJComponent[] anotherComps;

        if (noComps==comps.length){
	    anotherComps = new DJComponent[comps.length*2];
	    for (int i=0;i<comps.length;i++)  // copy
		anotherComps[i] = comps[i];
	    comps = anotherComps;
        }
   }
		     
   public void setColor(String cstring){
	color = (Color)ht.get(cstring);
   }

   public void addLine(Integer x1, Integer y1, Integer x2, Integer y2){
	expandCompsIfNecessary();
        comp = new DJLine(this,x1.intValue(),y1.intValue(),x2.intValue(),y2.intValue(),color);
        comp.draw();
        comps[noComps++] = comp;  
   }

   public void addOval(Integer x, Integer y, Integer w, Integer h, Integer fill){
	expandCompsIfNecessary();
        comp = new DJOval(this,x.intValue(),y.intValue(),w.intValue(),h.intValue(),color,fill.intValue());
        comp.draw();
        comps[noComps++] = comp;  
   }

   public void sleep(Integer mill) {
	try {
	    Thread.sleep(mill.intValue(),0);
	} catch(InterruptedException e) {}
   }
}

abstract class DJComponent {
     int x, y, width, height;    
     Applet ap;
     Color color = Color.black;
     Font font;

     abstract void draw();

     public DJComponent(Applet ap, int x, int y, int width, int height,Color color){
        this.ap = ap;
	this.x     = x;
        this.y     = y;
        this.width = width;
        this.height= height;
        this.color = color;
     }
}
class DJLine extends DJComponent {
      int x1,y1,x2,y2;
      public DJLine(Applet ap, int x1, int y1, int x2, int y2,Color color){
	super(ap,0,0,0,0,color);
	this.x1 = x1;
	this.x2 = x2;
	this.y1 = y1;
	this.y2 = y2;
     }

     void draw(){
	Graphics g = ap.getGraphics();
        g.setColor(color);
	g.drawLine(x1,y1,x2,y2);
    }
}


class DJOval extends DJComponent {
      boolean fill;
      public DJOval(Applet ap, int x, int y, int width, int height,Color color,int fill){
	super(ap,x,y,width,height,color);
	if (fill==0) this.fill = false; else this.fill = true;
     }

     void draw(){
	Graphics g = ap.getGraphics();
        g.setColor(color);
	if (fill)
	    g.fillOval(x,y,width,height);
	else
	    g.drawOval(x,y,width,height);
    }
}