Making my yellow stars bigger

[IAM]

How can i make my yellow star bigger?

import javax.swing.*;
import java.awt.*;
import java.awt.event.MouseWheelEvent;
import java.awt.event.MouseWheelListener;

public class Sterrenhemel extends JPanel implements MouseWheelListener
{
  private Ster yellowStar;
  private RodeSter redStar;
  private int bigger;
  Ster[] sterren = new Ster[100];
  private int red = 200;
  int xPositie[] = {0 + bigger,3 + bigger,12 + bigger,5 + bigger,8 + bigger,0 + bigger,-8 + bigger,-5 + bigger,-12 + bigger,-3 + bigger};
  int yPositie[] = {-13+ bigger,-4 + bigger,-4 + bigger,2 + bigger,11 + bigger,5 + bigger,11 + bigger,2 + bigger,-4 + bigger,-4 + bigger};
  
  
  public Sterrenhemel()
  {
	  yellowStar = new Ster( xPositie , yPositie, 10, Color.yellow );
	  redStar = new RodeSter( xPositie, yPositie, 10, new Color(red,0,0) );
	  addMouseWheelListener(this);
	  setFocusable(true);
	  requestFocus();
  }
  
  public void paintComponent( Graphics g )
  {
    super.paintComponent( g );
    setBackground(Color.blue);
    for(int i = 0; i < sterren.length; i++)
    {
    	if(i < 50)
    	{
    		yellowStar.teken( g );
    	}
    	else
    	{
    		redStar.teken( g );
    	}
    }
  }
  
  public void mouseWheelMoved( MouseWheelEvent e )
	{
	  	yellowStar.evolueer();
	  	redStar.evolueer();
	  	repaint();
	  	System.out.println(bigger);
	}
}

import java.awt.Color;
import java.awt.Graphics;
import java.awt.Polygon;
import java.util.Random;

public class Ster
{
	private int[]x = new int[10];
	private int[]y = new int[10];
	private int grootte;
	private int bigger;
	protected Color kleur; 
	
  
  public Ster( int[]x, int[]y, int grootte, Color kleur )
  {
    this.x = x;
    this.y = y;
    this.grootte = grootte;
    this.kleur = kleur;
  }

  public void teken( Graphics g ) 
  {
	Random generator = new Random();
	int Width = generator.nextInt(900);
	int Height = generator.nextInt(500);
	Polygon mytri = new Polygon(x,y,grootte);
	g.setColor( kleur );
    mytri.translate(Width, Height);
	g.fillPolygon(mytri);
    mytri.translate(-Width, -Height);
  }
  
  public void evolueer()
	{
		if( bigger < 100 )
		{
			bigger = 2;
		}
		else
		{
		}
		
	}
	
}

[eRaaaa]

you could use the AffineTransform class! (Transforming Shapes, Text, and Images (The Java™ Tutorials > 2D Graphics > Advanced Topics in Java2D))

somehting like:

	public void teken(Graphics g) {
		Random generator = new Random();
		int Width = generator.nextInt(900);
		int Height = generator.nextInt(500);
		Polygon mytri = new Polygon(x, y, grootte);
		Graphics2D g2 = (Graphics2D) g;
		AffineTransform saveOrig = g2.getTransform();
		AffineTransform scale = new AffineTransform();
		scale.scale(1.5, 1.5);
		g2.transform(scale);
		g.setColor(kleur);
		mytri.translate(Width, Height);
		g.fillPolygon(mytri);
		mytri.translate(-Width, -Height);
		g2.setTransform(saveOrig);
	}

or you have to use other coordinates!

[IAM]

Thank you!