Greenfoot

USER67

2013/2/6

#

How do you code a random color change for an object that occurs when it hits the edge of the world???????????????

paul10y

2013/2/6

#

well, one questionmark would have been enough

Gevater_Tod4711

2013/2/6

#

To get a random color you just have to create a new color with random values:

import java.awt.Color;

//...

Color randomColor = new Color(Greenfoot.getRandomNumber(255), Greenfoot.getRandomNumber(255), Greenfoot.getRandomNumber(255), 255);

To check whether the object is at the edge of the world you can use this method:

    public boolean atWorldEdge() {
        if(getX() < 20 || getX() > getWorld().getWidth() - 20) {
            return true;
        }
        if(getY() < 20 || getY() > getWorld().getHeight() - 20) {
            return true;
        }
        return false;
    }

Then you just need to change the image of your actor to the given Color.

JTSCADET

2013/10/18

#

import java.awt.Color;
//...
Color randomColor = new Color(rc, rc, rc);  
        if (getX() == 0 || getX() == getWorld().getWidth()-1) {
            setLocation((double)getX(), (double)getY());
            getMovement().revertHorizontal();
            accelerate(0.9);
            image.setColor(randomColor);
                    
         }
        else if (getY() == 0 || getY() == getWorld().getHeight()-1) {
            setLocation((double)getX(), (double)getY());
            getMovement().revertVertical();
            accelerate(.9);
            image.setColor(randomColor);
            
         }

I am trying to do the same thing but when i compile it says "image has private access in greenfoot.actor"

Gevater_Tod4711

2013/10/18

#

Try replacing 'image' trough 'getImage()'. This method returns the image of your actor.

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HELP! COLOUR CHANGE WHEN BOUNCEATEDGE