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Show class codes for this.

Found a solution, turns out I'm just dumb:

It's not a bug in greenfoot. It is provided as an empty method by greenfoot (just like the act method). Both are called internally by greenfoot (at appropriate times). Both are available to be over-ridden to add some implementation to them (have them actually do something).

Thank you very much, it works now ;)

A class name is not an Actor object (instance of Actor), which is required by removeObject. Use: <Code Omitted>

Sorry for such a late response. I didn't have the time to come back to programming this last days. Thank you, @danpost, for your answer. I'll try to figure a way out to achieve it with the information you gave me. Thank you and all the best

Store the String filename of the background image in a field in your settings world. When creating the game world, set its image right there before setting the game world active.

Thanks

No problem:-) Concerning the change of the world, this might also help: Every frame of the Greenfoot application the current world gets rendered by (simplified) stacking the images of all the actors on top of the worlds background image. If the world changes, the images used to render will simply look different on the next frame, which results in the world being switched visually. Additionally, Simulation will call act on the new world.

Multiply speed by direction in line 24.

Do NOT rotate the image. Maybe I misunderstood what you were trying to do. Please explain, in detail, what behavior you are trying to achieve.

As an example: <Code Omitted>Note the line 2 calls the Actor class method, setImage(String), on an Actor type object, actor.

I assume "Wait" is initially 0. And 25ms is not a quarter of a second but a fourteeth. You should use 250 there. But that is not the main problem. The thing is the first for-loop can run really quickly, and only if it is very slow (taking the 25ms) it would spawn another instance. The much simpler solution here is using Greenfoot.delay(int) where the number specifies the number of time steps to delay. The lenght of one time step can be adjusted using the ui slider or using Greenfoot.setSpeed(int). Example implementaion: