2D-Vector class library

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blackops7799
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2D-Vector class library

Post by blackops7799 »

I was making a physics based pong game so I came up with this class library.

It allows you to use vectors like so in the code below.

Code: Select all

	--I used this within a collision callback for my pong game
	local velx, vely = coll:getVelocity()
	local IncidentVec = Vector.new( velx, vely )
	local speed = IncidentVec:Length()
	local colx, coly = coll:getNormal()
	local Normal = Vector.new( colx, coly )
	Normal:Normalize()
	
	local DotProduct = Normal:Dot( IncidentVec * -1 ) --reflect the bounce
	local Dir = ( 2 * Normal * DotProduct ) + IncidentVec
	Dir:Normalize()
	
	someBodyObject:setLinearVelocity( Dir.x * speed, Dir.y * speed )
It just makes things a lot simpler, organized, and easy to read. Sorry if there is already something like this here, but I searched and didn't find anything.

Enjoy!

Demo:
http://www.blackopsservers.com/blackops ... _demo.love
Demo shows a ball continuously bouncing around on your screen.
Press space to reset the ball and randomly punt it again.
Attachments
vector.lua
2D-Vector class library
(4.54 KiB) Downloaded 236 times
Last edited by blackops7799 on Wed Apr 21, 2010 7:28 pm, edited 4 times in total.
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nevon
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Re: 2D-Vector class library

Post by nevon »

I can tell you're new here. Libraries and other useful snippets of code are required to have a NSFW name.
blackops7799
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Re: 2D-Vector class library

Post by blackops7799 »

That's pretty stupid. Shows the maturity of this place.
Umbrageous
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Re: 2D-Vector class library

Post by Umbrageous »

Nah, I see it as kind of fun, not everything has to be serious you know, The best part is the nsfw name lol.
But This is really cool, and pretty useful too
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bmelts
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Re: 2D-Vector class library

Post by bmelts »

I think nevon may have been being a tad facetious :ehem:
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Jasoco
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Re: 2D-Vector class library

Post by Jasoco »

As hard as I think, I can't come up with a clever NSFW name for this library. Anyone else?

Also, is MiddleClass and MindState the exceptions to this silly rule? ;)
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bmelts
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Re: 2D-Vector class library

Post by bmelts »

Vectors Are Great
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bartbes
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Re: 2D-Vector class library

Post by bartbes »

blackops7799 wrote:That's pretty stupid. Shows the maturity of this place.
Maturity is overrated.
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nevon
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Re: 2D-Vector class library

Post by nevon »

blackops7799 wrote:That's pretty stupid. Shows the maturity of this place.
I know it can be kind of hard to tell what's serious or not on the internet, but geez!

At least Anjo got it. :ehem:
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kikito
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Re: 2D-Vector class library

Post by kikito »

Jasoco wrote:As hard as I think, I can't come up with a clever NSFW name for this library. Anyone else?

Also, is MiddleClass and MindState the exceptions to this silly rule? ;)
Well, PÄSSION is also quite SFW, IMHO. OMG BBQ.
When I write def I mean function.
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