单击事件时更改Java中形状的大小

Question

我想在每次用户点击单选按钮时更改形状的大小。但是我有中小问题，但是对于大型我不知道这样做的正确方法。罐头有人帮我这个。

 protected int radius = 1;
   public void circle(Graphics shapes)
{
    shapes.setColor(color);
    shapes.fillOval(250,100, 100/radius, 100/radius);
}

public void rectangle(Graphics shapes)
{
    shapes.setColor(color);
    shapes.fillRect(250,100,100/radius,100/radius);
}
public void square(Graphics shapes)
{
    shapes.setColor(color);
    shapes.fillRect(200,100,200/radius,100/radius);
}
public void triangle(Graphics shapes)
{     
    int[] x = new int[3];
    int[] y = new int[3];
    x[0]=300; x[1]=350; x[2]=250;       
    y[0]=100/radius; y[1]=200; y[2]=200;    
    Polygon polygon = new Polygon(x,y,3);
    shapes.setColor(color);
    shapes.fillPolygon(polygon);
}
 public void actionPerformed(ActionEvent click) {    
    if(click.getSource() == small){
        radius = 1*2;repaint();
    }else if(click.getSource() == medium){
        radius = 1; repaint();
    }
    else if(click.getSource() == large){
        radius = 1; repaint();
    }
}