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ok thx

Please show the code for your Welt class.

okay, it works now, dont know why it didnt before nevertheless thanks :D

I have successfully built BlueJ and Greenfoot now. Here is a much more detailed "log" of how I built it, which may be useful to others in the future. This way built on Mac OS. 1. mkdir ~/build_gf 2. cd ~/build_gf 3. unzip ../Greenfoot-source-2.3.0 4. Mac21495:build_gf vtn2$ ll total 0 drwxr-xr-x 4 vtn2 staff 136 Jun 19 20:47 ./ drwx--x--x 92 vtn2 staff 3128 Jun 19 20:46 ../ drwxr-xr-x 13 vtn2 staff 442 Apr 25 2013 bluej/ drwxr-xr-x 14 vtn2 staff 476 Apr 25 2013 greenfoot/ 5. Start up Eclipse Classic 4.2.2.app 6. Switched workspace to /Users/vtn2/build_gf. Ec

I think I see where lordhershey is coming from; though, his original post does not seem to have much of anything to do with this issue (a LineOfSight object is only being created once in a blue moon and the pixel-sized image is used once at that time). However, you are creating a new GreenfootImage object each act cycle for the LineOfSight actor at line 41. You could change that line to the following: <Code Omitted>to avoid overhead on the GC.

Your code is perfect for timing act cycles. You just need to add 1 (or more) to curTime every act, instead of getting currentTimeMillis()

Please refer to the page on Classes and Objects of the Java tutorials.

All right, thanks alot for all the answers!!

thanks :)

Ah, I understand. Thanks again!

In the 'if(isTouching(Player.class))' block, after line 7, you need to ask 'if the "new" current value of the life counter is zero, set a new end game world as the active world'.

I sent you an invitation for the demo project via Dropbox. Thanks for help!

It should work as good as your original. Line 1: sets 'x' to 0 for 'q', 1 for 'w', 2 for 'e' and 3 for 'r'. If none of these keys are detected, then it sets x to -1. Line 2: exits the method if none of the four keys were detected. Line 4: same as lines 15, 36, 53, and 70 of your code above. The rest: same as your blocks for the different keys. I just used the value of 'x' instead of hard-coding '0', '1', '2' and '3' where needed. This should not alter the way the code works in any way and probably will not fix your problem (which I presume resides elsewhere in your code). Maybe yo

Thanks guys. I did it like this: <Code Omitted>

The Greenfoot class API contains a 'getRandomNumber(int)' method that you can use to get a number from 0 to 'int n'-1. Please refer to the API for more info.