Translation Code

function translateToScreen(x,y)
	x = x - 960
	y = y - 540

	x = x * 0.5

	local angle = math.atan2(y,x)-math.pi/4
    if angle < 0 then angle = angle +math.pi*2 end
    local length = math.sqrt(x * x + y * y)

    x,y = math.cos(angle)*length , math.sin(angle)*length

	x = x / grid.blockSize
	y = y / grid.blockSize

	return x,y
end

function translateToIso(x,y,z)
	z = z or 0
	assert(type(x) == "number", "first argument (x) is not a number")
	assert(type(y) == "number", "second argument (y) is not a number")

	local angle = math.atan2(y,x)+math.pi/4
    if angle < 0 then angle = angle +math.pi*2 end
    local length = math.sqrt(x * x + y * y)

    x,y = math.cos(angle)*length , math.sin(angle)*length

	x,y = x*2*grid.blockSize, y*grid.blockSize
	x,y = x+960,y+540- z*grid.blockSize*math.sqrt(2)
	return x , y
end