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I think I broke Java.

post #1 of 3
Thread Starter 
So, I'm writing a camera class for my game, and just building it up incrementally.


I'm having issues with some of the constructor code...
Code:
public Camera(float xx, float yy, float zz){
        x=xx;
        lx=x;
        System.out.println(x + " | " + lx) ;
        ...
}
x is the eye position, lx is the original eye position. My idea was to have the camera look at x-lx, which is the change in x since the camera was created.

I can't even get that far though, because the println tells me that x = 10, while lx is equal to -800.

10 is the proper value, -800 is the value for zz.

That shouldn't even be remotely possible, since the previous statement is literally lx = x, so x and lx should have the same value.

For some reason instead of setting lx to x, its setting lx to &x + 2*sizeof(float)


BUT WAIT! This isn't c, its Java! That kind of statement shouldn't even be possible.


Any idea why its doing this? Is it just some bug in the JVM, or did I somehow manage to screw something up?



I had lx = zz instead of lz = zz.
Edited by nathris - 8/3/11 at 3:27pm
    
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post #2 of 3
i seriously doubt its a bug in the JVM. ive had screwy things happen with my java code before and in the end it was always a mistake i made. where there any runtime errors or warnings?

from what you posted, something is definitely wrong, but its hard to tell what. how big is the class or classes? could you upload the entire code so we can maybe see if its an error somewhere else in the class?

EDIT: i forgot to refresh the page before posting. glad you fixed it.
Edited by travesty - 8/3/11 at 3:32pm
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post #3 of 3
these are the type of headaches you'll get when not using a debugger.

http://www.eclipse.org/downloads/pac...lopers/indigor

http://www.ibm.com/developerworks/library/os-ecbug/

drop to frame & hot replace is just too valuable.

Ideal adding code routine:
1.Write test case
2. Write skeleton of code that does nothing
3. Run tests, observe red bar
4. Add code to make test case pass
5. Run tests, observe red bar
6. Debug broken code
7. Watch tests show green bar
8. Enhance test cases as far as you can witin reason
9. Repeat steps 2-8 until everything is fully under test and green
10. Repeat steps 1-10 for next piece of feature
Edited by lloyd mcclendon - 8/4/11 at 8:11pm
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