anchor: ParticleSystem:getEmissionArea
  Gets the area-based spawn parameters for the particles.
  distribution, dx, dy, angle, directionRelativeToCenter = ParticleSystem:getEmissionArea()
  distribution AreaSpreadDistribution The type of distribution for new particles.
  dx number The maximum spawn distance from the emitter along the x-axis for uniform distribution, or the standard deviation along the x-axis for normal distribution.
  dy number The maximum spawn distance from the emitter along the y-axis for uniform distribution, or the standard deviation along the y-axis for normal distribution.
  angle number The angle in radians of the emission area.
  directionRelativeToCenter boolean True if newly spawned particles will be oriented relative to the center of the emission area, false otherwise.