# Lightning Effect PyGame [closed]

I want to create a Lightning Effect Like http://www.youtube.com/watch?feature=player_embedded&v=mmU2GAYGVSU for my game.

The following blog explains it briefly but I am not able to understand the following line:

midPoint += Perpendicular(Normalize(endPoint-startPoint))*RandomFloat(-offsetAmount,offsetAmount);


UPD: I went through older question posted at gamedev.stackexchange and found following explanation:

Normalize(endPoint-startPoint):


That line gets a unit vector (vector of length 1) from startPoint to endPoint

Perpendicular(Normalize(endPoint-startPoint))


then gets a vector perpendicular to that (i.e. at right angles to the line)

I want to know whether python has inbuilt function for

• Getting a unit vector (vector of length 1) from startPoint to endPoint

• Getting a vector perpendicular to that (i.e. at right angles to the line)

## closed as not constructive by msell, Anko, bummzack, Josh♦, MichaelHouse♦Jun 6 '13 at 18:04

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• The code on that page is not C#, it's pseudocode. It should easily translate to Python. – msell Jun 3 '13 at 5:48

## 1 Answer

Pygame has a vector math module. There you have the methods normalize and rotate, which you can use to construct unit and perpendicular vectors respectively.

http://www.pygame.org/docs/ref/math.html