I am having trouble to set color to my Greenfoot MyWorld class

Question

I am new to programming and we have an assignment about making a Greenfoot game. now I am trying to set some colors to MyWorld but having some problems. My code in MyWorld file is

   public MyWorld()
{    
    // Create a new world with 600x400 cells with a cell size of 1x1 pixels.
    super(600, 400, 1); 
    GreenfootImage bg = new GreenfootImage(600, 400);
    bg.setColor(new Color(0, 0, 250, 9));
    setImage(bg);

}

and it is returning an error

cannot find symbol - method setImage(greenfoot.GreenfootImage)

The same code on one of the Actor classes working normally.

    public BgCells(){
    GreenfootImage bgBig = new GreenfootImage(200, 200);
    bgBig.setColor(new Color(0, 0, 250));
    setImage(bgBig);
}

Answer 1

The method in Actor is called setImage, but the similar method in World is called setBackground . A bit confusing, I know.

Note also that setColor doesn't do anything by itself, it just sets the drawing colour. If you want to fill the image with that colour, call bgBig.fill after calling setColor.