Introduction to the Figure Package - PostScript File Sample.

Sample Code Yielding a PostScript File

Here is some sample code that produces a postscript file named psRose.ps as output. Note that Java applets cannot create files (for security reasons). So this implementation must be an application. Also note that (for some reason that I do not yet know) you must explicitly exit with "System.exit(0)".

              /*  File:  psRose.java    */

import java.io.* ;
import figPac.* ;

 

public class  psRose {


   public static void main(String argv[]) {

      Figure canvas = new Figure(6,6) ;
      canvas.limits(-300,-300,300,300) ;

      canvas.append(new fAxes("x axis","y axis") ) ;    
      fSubFigure subfig= new fSubFigure() ;
      subfig.append(new fCurve(new rose(200,3),
                               0,Math.PI,
                               fCurve.CLOSED+fCurve.FILLED)) ;
      canvas.append(new fEnv("psFillGray", 0.8)) ;
      canvas.append(subfig) ;
      canvas.append(new fLabel(100,50,"cc","Petal")) ;

      canvas.toPsFile("psRose.ps") ;
      System.exit(0) ;
      }
}


class rose implements S2V {

   double radius ;
   int noPetals ;

   public rose(double radius, int noPetals) {
      this.radius = radius ;
      this.noPetals = noPetals ;
     }

   public double[] map(double t) {
      double[] out = new double[2] ;
      out[0] = radius*Math.cos(t)*Math.sin(noPetals*t)  ;
      out[1] = radius*Math.sin(t)*Math.sin(noPetals*t)  ;
      return out ;
     }

}

To compile and execute this program and print the resulting file you would save it to a file named psRose.java and then use

     javac psRose.java
     java psRose
     lpr psRose.ps