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Snippet: Collision check Circle2Circle — Gideros Forum
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    Snippet: Collision check Circle2Circle

    MikeHartMikeHart Guru
    edited January 2012 in Code snippets
    Hi there,

    here is a function, which will check a collision between 2 sprites by checkingif their collision circles overlap.
    collCheck_Circle2C = function( source, target )
	local xf = source:getX() - target:getX()
	xf = xf * xf
	local yf = source:getY() - target:getY()
	yf = yf * yf
	local ssx, ssy = source:getScale()
	local tsx, tsy = target:getScale()
 
	local rf = (source.radius*ssx) + (target.radius*tsx)
	rf = rf * rf
	if (xf+yf) < rf then
    	return true
    end
    return false
end
    Each sprite needs a radius property. Set or calculate it when you create the sprite. Or dynamically from the maximum of width and height during this function call. But then you don't need to multiply them with the scale factor.

    Cheers
    Michael
    http://michaelhartlef.carbonmade.com
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