sqrt = math.sqrt
tan  = math.tan
cos  = math.cos
atan = math.atan

function CalculateThrow(mode,start,finish,...)
	local variables = {...}

	if mode == "bullet" then
		local g = workspace.Gravity

		local distance = (start-finish).magnitude

		if distance > 150 then distance = 150 end

		local angle = math.rad(15) * distance/150

		local direction = ((finish-start)*Vector3.new(1,0,1)).unit

		local x = (start * Vector3.new(1,0,1)-finish * Vector3.new(1,0,1)).magnitude -- target x
		local o = angle -- launch angle
		local v = (sqrt(g) * sqrt(x) * sqrt((tan(o)*tan(o))+1)) / sqrt(2 * tan(o)) -- velocity
		local t = -(math.sin(angle) * v) / g

		if variables[1] then

			local lead = t * variables[1] * 2

			return CalculateThrow(mode, start, finish - lead)

		end

      	return v, direction, angle, t

	elseif mode=="lob" then
		local g = workspace.Gravity
		local distance = (start-finish).magnitude
		if distance > 50 then distance = 50 end

		local angle = math.rad(50) * distance/50
		local direction = ((finish-start)*Vector3.new(1,0,1)).unit
		local x = (start * Vector3.new(1,0,1)-finish * Vector3.new(1,0,1)).magnitude -- target x
		local o = angle -- launch angle
		local v = (sqrt(g) * sqrt(x) * sqrt((tan(o)*tan(o))+1)) / sqrt(2 * tan(o)) -- velocity
		local t = -(math.sin(angle) * v) / g

		if variables[1] then
			local lead = t * variables[1] * 2
			return CalculateThrow(mode, start, finish - lead)
		end

      	return v, direction, angle, t

    end

end

function Draw(start,finish,lifetime)
	local P = Instance.new("Part");
	local M = Instance.new("CylinderMesh",P); -- ya
	local Distance = (start-finish).magnitude

	P.Anchored = true;
	P.CanCollide = false;


	P.Size = Vector3.new(0.45,Distance,0.45) -- ya but its too big, its just creates parts on top of eachother
	P.CFrame = CFrame.new(start,finish) * CFrame.Angles(math.pi/2,0,0) * CFrame.new(0,-Distance/2,0)

	P.Parent = workspace; --???
	game:GetService("Debris"):AddItem(P,lifetime);
end;

function Preview(frame,velocity,time_,start,finish) -- good point
	local distance = (start-finish).magnitude;
	local previous = frame.p;
	local _time = time_/distance/5;


	for i = 1,distance/5 do
		local new = previous-velocity*_time-Vector3.new(0,2*_time,0); --[[Y = workspace.Gravity]]

		Draw(previous,new,1);
		previous = new; -- shh not my fault
	end;

end;

wait(4)
while wait() do

workspace.a.CFrame = CFrame.new(-36.8,workspace.expounding.Torso.Position.Y,-17)
dude = workspace.c:Clone()
dude.Parent = workspace
local velocity, direction, angle, t = CalculateThrow("bullet", workspace.a.Position, workspace.expounding.Torso.Position, workspace.expounding.Torso.Velocity)
local frame = CFrame.new(workspace.a.Position, workspace.a.Position + direction) * CFrame.Angles(angle,0,0)

Preview(frame,frame.lookVector*velocity,t,workspace.a.Position,workspace.expounding.Torso.Position)
--Draw(Vector3.new(0,5,0),Vector3.new(10,5,0),1)
dude.CFrame = frame
dude.Velocity = frame.lookVector * velocity
end