Module:BulletGravityMultiplier

Documentation for this module may be created at Module:BulletGravityMultiplier/doc

local p = {}

-- Convert ballisticDrop to bulletGravityMultiplier
function p.convert_drop(frame)
	local range = tonumber(frame.args.range) or 0
	local ballistic_travel = tonumber(frame.args.travel) or 10
	local ballistic_steps = tonumber(frame.args.steps) or (range / ballistic_travel)
	local ballistic_drop = tonumber(frame.args.drop)
	local bullet_gravity_multiplier = 4
	
	if ballistic_drop then -- Has ballisticDrop been specified?
		if ballistic_drop < 0.000001 then -- Is ballisticDrop a valid value?
			bullet_gravity_multiplier = 0
		else
			local num1 = 0
			local right = {x = 1.0, y = 0.0} -- Create a Vector2.right
			local length
			
			for l = 1, ballistic_steps do
				num1 = num1 + right.y * ballistic_travel
				right.y = right.y - ballistic_drop
				-- Normalize the vector...
				length = math.sqrt( math.pow(right.x, 2) + math.pow(right.y, 2) ) -- Calculate length
				right.x = right.x / length -- Normalize x value
				right.y = right.y / length -- Normalize y value
			end
			
			-- Finish calculating bulletGravityMultiplier
			local num2 = ballistic_steps * 0.02
			local num3 = 2 * num1 / (num2 * num2)
			bullet_gravity_multiplier = num3 / -9.81
		end
	end
	-- Return the calculated value
	return bullet_gravity_multiplier
end

return p