Introduction to the Figure Package - TeX Sample.

Sample Code Yielding a Screen Image and Files for Inclusion in a TeX Document.

Here is some sample code that produces a PostScript file named texStep.ps and a label file named texStep.lbl when run as an application (Java applets cannot create files - for security reasons) and that yields a screen image when run as an applet. 
                  /*  File:  texStep.java    */

import java.applet.* ;
import java.awt.* ;
import figPac.* ;

 

public class  texStep extends Applet {

   static void prepareFigure(Figure canvas) {
      canvas.limits(-1,-1,4,4) ;
      canvas.append(new fAxes() ) ;   
      canvas.fTeXlabel(0, 4.1, "bc","$s(x)$","s(x)") ;
      canvas.fTeXlabel(4.1,0,"lc","$x$","x") ;
      canvas.append(new fCurve(new step(.5,1,3)) ) ;
   }

   public void init() {          
      Figure canvas = new Figure(this,5,5) ;
      this.add(canvas) ;
      canvas.useZoom = true ;
      canvas.useDrag = true ;
      canvas.showCoords =true ;
      prepareFigure(canvas) ;
      canvas.toScreen() ;
   }

   public static void main(String argv[]) {
      Figure canvas = new Figure(5,5) ;
      prepareFigure(canvas) ;
      canvas.toPsFile("texStep.ps") ;
      canvas.toLblFile("texStep.lbl") ;
      System.exit(0) ;
      }    
}


class step implements S2S {

   double location = 0 ;
   double left_height = 0 ;
   double right_height = 1 ;

   public step() {
   }

   public step(double location, double left_height, double right_height) {
      this.location = location;
      this.left_height = left_height ;
      this.right_height = right_height ;
   }

     public double map(double t) {
      if ( t>location) return right_height ;
      else return left_height ;
   }
}
To compile this program you would save it to a file named texStep.java and then execute 
     javac texStep.java
To get a screen image you would also create a file called texStep.html containing 
<HEAD><TITLE>Figure Test Program</TITLE></HEAD>
<BODY>
<H1>Figure Test Program </H1>

<P>
<APPLET code="texStep.class" width=500 height=500></APPLET>

</BODY>
and then execute 
     appletviewer texStep.html &
To, instead, create the PostScript and label files you would, after compiling texStep.java, execute 
     java texStep
To embed the resulting figure in a TeX document you would