Cheat Engine

[Cryoma]

Ok so here's what I want to do:
Create two points on the screen anchored to a window (800x600 program and I want points at like 40,50 and 40,80 for example, constrained to that window) and I want to trace a red ray from those two points using the cursor to set the angle.
I want these rays to stop when they hit the walls of a set field (say the edges of the window) and reflect once.
Essentially a mouse guide for a bubble break game, except it has to be an overlaying application instead of coded in.
So I need to know how to render these lines over a game without interfering with the mouse click.
What language should I pick?

[atom0s]

[Dark Byte]

Fullscreen or windowed ?
And do you care if clicking on a image blocks the mousemove or not?

If it's windowed and you don't care, look into window regions and give the window the same shape as the drawing

if fullscreen find out how it renders and hook that (d3d, opengl, gdiEx, etc...)

if windowed and you do want to click in the graphics, look into passing the mouse event messages down to the window behind it

[Cryoma]

It's a windowed java game, and it patches any files you try to change which is why I need to do an overlay.

[chASM]