Collision Detection using OpenGL

[Kmrox09]

Trying to make pinball using OpenGL the collision detection I am using in the code is not working at all 

The collision detection i have implemented is in the layout.cpp and all the variables used is in ball.cpp(i have attached files with it)

I am using this formula to find the shortest distance of ball from the line:-

distance = |(p - a) * (p - b)| / |b - a|

( * operator used in the equation is cross product )

where p is position vector of center of ball , a and b are position vectors of endpoints of a line

please share if anyone have any other way of detecting collision in CPP.

layout.txt

ball.txt

[Sauron]

The cross product only makes sense in 3d space.

 

You might have misread this answer; the formula you need is

 

[(p - a) . (p - b)] / |b - a|²

 

Where . is the dot product; this gives you the projection of the point on the line extended from the segment; you can then clamp the projection to the segment and work out the distance between that and the point.

[Guest]

I did some 2D graphics using STD DRAW and when I did collision I only really worried about circles. 

Basically to stop from going to the edge I did

 

If (location + radius >= screen width)

//bounce. 

 

I did have a few other things but I don’t recall what I did. If I have the files, I’ll post what I did. Java is close enough to C++ that you’ll understand what's going on. 

 

Edit 

I saw some books for cheap on amazon about 2D collision. Might be worth it.