getHeight method

The getHeight method must be used on an image. You wouldn't just type getHeight(); because the compiler doesn't know what you want to get the height of. You can use it as getImage().getHeight(); to get the height of the actors image, or you point it to a specific image like so... GreenfootImage image = new GreenfootImage("image_name.png"); public void act() { image.getHeight(); } Hope this helps.

In the tutorial there is this code in the Pengu class: public boolean onGround() { Actor under = getOneObjectAtOffset ( 0, getHeight() / 2, Ground.class); return under != null; } The getHeight() is reffered to the Pengu height and even when writing Pengu.getHeight() it doesn't compile.

Sorry if my previous post was unclear. You need to reference an image file before getting the height of it. Adding a simple getImage(). following your getHeight() will fix your problem. public boolean onGround() { Actor under = getOneObjectAtOffset ( 0, getImage().getHeight() / 2, Ground.class); return under != null; }