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It worked! Thank you for the help.

Length of margin is twice the sum of width plus height minus four. A random pick from length will give a single point along the margin. Converting the random value to a set of coordinates is do-able, but not a simple matter (just takes a little math knowledge).

Or: <Code Omitted> or something along this line: <Code Omitted> The best way would depend on how you create your red and blue cars. That is why it always helps to provide related class codes (and describe your classes structure)

(A) Creating a new array: <Code Omitted> {B} Using an ArrayList object: <Code Omitted>The list can be of any Object type (pr

Use <Code Omitted>(at normal speed, this would be about one second's time).

Try: else setImage(new GreenfootImage(""...rest...); Or better yet: else setImage((Greenfootimage)null);

Btw you can remove line 3 as it does nothing

Thank you so much!

OMG MR COHEN!!!! YES! I FIND THAT ONE POTENTIAL REASON MY PROGRAM CRASH IS BECAUSE I DO SCALING 10000 TIMES ON THE CONSTRUCTER. PNG SCALING DOES NOT WORK WELL ON PREVIEW LOL SO PROBABLY I NEED TO FIND ANOTHER TOOL! OMG WHY YOU ARE ON GREENFOOT WEBSITE ALL THE TIME HAHAHAHAHAH!

Oke, thank you. @Danpost

In KogelView class update method, you would need to check with: <Code Omitted>and then remove the KogelView object from its controller to effectively remove the bullet it controls.

Sorry I hastily chopped two parts together. Thanks for the correction. I'm curious if this will solve OP's problem

Best to scale images with an image app like Paint. Image manipulation during program execution can increase the possibility of lag (or increase the present lag). Reducing the entire size of your scenario would probably help as far as lag is concerned Think of it -- cutting all length in half would reduce image file sizes to one fourth (1/2 by 1/2). Removing image files not required for the scenario would help load time.

You need to upload it again (update it) -- this time, just make sure to check the "Publish source code" box.

Might want to also restrict the key returned to being character values of at least 32 (to printable characters). Line 10 in Hippo's code could be: <Code Omitted>