Available since LÖVE 0.9.0  
 This function is not supported in earlier versions. 
Sets area-based spawn parameters for the particles. Newly created particles will spawn in an area around the emitter based on the parameters to this function.
ParticleSystem:setAreaSpread( distribution, dx, dy )
AreaSpreadDistribution distributionnumber dxnumber dyNothing.
    © 2006–2016 LÖVE Development Team
Licensed under the GNU Free Documentation License, Version 1.3.
    https://love2d.org/wiki/ParticleSystem:setAreaSpread