Got to love flash. As if working with angles can't be disorientating enough already:
Flash works with the y-axis downwards and with the angles clockwise positive. Alright, that goes well together, provided you don't get lost along the way.
Flash works with the y-axis as orientation for angles: 0 degrees and you look downwards. Fine, everything just turned 90 degrees. (clockwise)
Flash works with angles in degrees, but it's math functions work in radians.
Flash stores it's sprite's orientation from -179 to 180, something I didn't figure out untill I noticed a (face == 270) boolean always returned false.

This is addition to the problems I brought onto myself:
The player object has a weapon as child. The child of a sprite uses the rotation of that sprite as it's y-axis.
The weapon has a varying distance and rotation from it's own centerpoint (what it sees as x=0,y=0)

I'm trying to determine the position from a ball bouncing through the level in comparison to the position of the player's weapon. This means cross-class calculations and somewhere I made a mistake that causes my calculations to get slightly different awnsers when looking into a specific direction.
YOY

I could upload the game and tell you to never face right, but that kind of beats the purpose of this excersize. I know I won't finish this today.


Good habits?
I have the habit to set up objects in such a way that it allows easy expansion later on. That game I uploaded? It's really easy to add new levels. Just make a new class extending a specific other class and add it to the levellist array, it will automaticly read it.
I doubt I'll ever work on that program again.
The game I'm currently working on? I made it so that I can add other weapons than the sword. Will I ever do that? I doubt it.
Still, working according to this method, while more time consuming, allows easier tracking of some bugs. And if I do decide to revisit an older project, at least I won't be completely without clue. (just mostly)
The big advantage of this habit probably won't show till I get to work on larger projects, or projects worked on by multiple people. That reminds me that I've underdocumented the game I'm currently working on...