Hi all ,
Am trying to change a scale the size  of an image according to a parameter given by a user . The thing is the size of an image it seems  never be  changed after I input the parameter, I do not know why , am using NetBeans with processing
 here is my code , if any one can help me, Thanks

1. /*
    * To change this template, choose Tools | Templates
    * and open the template in the editor.
    */
   
   package markerscaling;
   
   import java.util.Scanner;
   import processing.core.PApplet;
   import processing.core.PImage;
   
   /**
    *
    * @author tamara
    */
   public class Main  extends PApplet{
       Scanner input =new Scanner(System.in);
        public PImage marker;
       public float cm;
       public float cm2;
       public int markerWidth;
       public int markerHeight;
       public static void main(String[] args)
   {
       PApplet.main(new String[]{"--present", "markerscaling.Main"});
             // ArrayList<TableRecord>csvInputTableRecords= new ArrayList <TableRecord>();
           // TODO code application logic here
   }
       @Override
   public void setup()
   {
   
            marker= loadImage("25.png");
            markerWidth= marker.width;
            markerHeight=marker.height;
            println("The size of the marker before scaling is"+ markerWidth+" "+ markerHeight);
            float pixelPerInchOfWidth=markerWidth/72;
            float pixelPerInchOfHight=markerHeight/72;
            float pixelPerCmOfWidth=  (pixelPerInchOfWidth / 2.54f);
            float pixelPerCmOfHeight= (pixelPerInchOfHight / 2.54f);
   
            System.out.print("Enter the size of am imaege");
            float size= input.nextFloat();
           
           
            cm =size*pixelPerCmOfWidth;
            cm2=size*pixelPerCmOfHeight;
           // scale(1.5f,1.5f);
   
           println("the size of the marker after scaling is"+markerWidth+" "+ markerHeight);
          
           size(markerWidth, markerHeight);
           noLoop();
      
       }
       @Override
      public  void draw()
       {
          
           scale(markerWidth/cm, markerHeight/cm2);
         
           image(marker,0,0);
           save("marker.png");
          
       }
       public void KeyPressed()
       {
   
           redraw();
       }
          
   }