TILTBALL!
Tiltball is my first game for the calc, written in axe.  

I asked a question for the math of this game earlier, but now i realize that i will probably need to ask more questions...

a brief overview of the game:

The ball falls from the cieling, due to gravity. the goal is to get the ball to the floor, without hitting the walls. There will be lines in the way of the ball, which the ball bounces off of. The only thing you can control is the rotation of the lines, as shown in the pictures below.

The original level:

Now, after you press the -> arrow on the keyboard:

all of the lines have been rotated counterclockwise around the center point.

That is the general idea.

I have the rotation of the lines worked out, but still have two of questions:

1. Is there any way to clip the lines without sacrificing too much speed?
2. How to calculate angle of bounce? so if the ball is coming in at velocity of xv, yv, and slope of the line m, how to bounce off?

Thanks in advance!

Whoa! that is a lot of information right there. It is kind of like vortex (I never even knew about it before today), but the ball is not coming from the center.

I guess i did not describe the game as much as i should've.

The ball falls from the cieling, due to gravity. the goal is to get the ball to the floor, without hitting the walls. There will be lines in the way of the ball, which the ball bounces off of. The only thing you can control is the rotation of the lines, as shown in the pictures below.

The original level:

Now, after you press the -> arrow on the keyboard:

all of the lines have been rotated counterclockwise around the center point.

The question should be, what formula could be applied to all the starting/ending points of the lines to rotate (counter)clockwise?

Where GDB1 is the point data for the lines, x1,y1 is the first point of the line, and x2,y2 is the second point of the line.
:For(A,1,L)
:{A*4+GDB1->B} .is x1
:{B+1} .is y1
:{B+3} .is x2
:{B+4} .is y2
:(Insert formula here to rotate points)
:EndAnd for the test to see if a point is on the line, that was to check if the ball is hitting a line.
Thanks for any future help.
EDIT:
Thanks Nemo for the explanation, that was exactly what I was looking for. Thanks!

Ah. Ok. Thanks for the information! 

Hello! since I love programming and love my calc (ti83+), I searched through the wild haystack of the internet looking for the best place to find useful calc information. I have finally found it! omnimaga is the awesomest place for calcs, and is exactly the thing I was looking for. Thanks to everyone for keeping this site up, I hope that I can contribute!

Hi, I've been a fan of these forums, got a lot of great programming tips from here. This is my first post, because it's the first time I have ever had anything worthy of the forums.

Science tools!
The attached zip archive contains two programs: a periodic table, and a science conversion tool, both with source.
I hope you like it!
(Screenshots are in the zip, I couldn't get photobucket to work)
The file:
http://www.mediafire.com/?oz5oq3z68giirsg