trig circle maker (funny)

local center_part = Instance.new("Part")
center_part.Size = Vector3.new(1,1,1)
center_part.Anchored = true
center_part.CanCollide = true
center_part.Parent = script

local offset = CFrame.new(20,20,0)
center_part.CFrame = offset

local target_part = center_part:Clone()
target_part.Parent = script

local hyp_part = center_part:Clone()
hyp_part.Transparency = 0.5
hyp_part.Color = Color3.new(1,0,0)
hyp_part.Parent = script

local adj_part = center_part:Clone()
adj_part.Transparency = 0.5
adj_part.Color = Color3.new(0,1,0)
adj_part.Parent = script

local opp_part = center_part:Clone()
opp_part.Transparency = 0.5
opp_part.Color = Color3.new(0,0,1)
opp_part.Parent = script

local at1 = Instance.new("Attachment")
at1.Position = Vector3.new(0,-0.5,0)
at1.Parent = target_part
local at2 = Instance.new("Attachment")
at1.Position = Vector3.new(0,0.5,0)
at2.Parent = target_part

local trail = Instance.new("Trail")
trail.Attachment0 = at1
trail.Attachment1 = at2
trail.FaceCamera = true
trail.Transparency = NumberSequence.new(0,1)
trail.Lifetime = 1
trail.MinLength = 0
trail.WidthScale = NumberSequence.new(1,1)
trail.Parent = target_part

local angle_change = nil
local hyp_mult = 1
function update()
    local speed = 5
    local dist = 10

    local t = os.clock()*speed

    target_part.CFrame = offset*CFrame.new(0,math.cos(t)*dist,math.sin(t)*dist)

    local pos_sub = (center_part.Position-target_part.Position)*Vector3.new(0,1,1)
    local hyp = pos_sub.Magnitude
    if 0 > pos_sub.Y and hyp_mult == 1 then
        hyp_mult = -1

        local s = Instance.new("Sound")
        s.SoundId = 'rbxassetid://2687161647'
        s.Volume = 0.5
        s.PlayOnRemove = true
        s.Parent = target_part
        s:Destroy()
    elseif pos_sub.Y > 0 and hyp_mult == -1 then
        hyp_mult = 1

        local s = Instance.new("Sound")
        s.SoundId = 'rbxassetid://9111926008'
        s.Volume = 0.5
        s.PlayOnRemove = true
        s.Parent = target_part
        s:Destroy()
    end
    hyp = hyp*hyp_mult

    local adj = pos_sub.Z
    -- cosA = adj/hyp, A = arccos(adj/hyp)
    local angle = math.acos(adj/hyp)
    angle_change = angle
    -- sinA = opp/hyp, opp = hyp*sin(angle)
    local opp = hyp*math.sin(angle)

    hyp_part.Size = Vector3.new(1,1,math.abs(hyp))
    hyp_part.CFrame = offset*CFrame.new(0,-pos_sub.Y/2,-pos_sub.Z/2)*CFrame.Angles(angle*-1,0,0)

    adj_part.Size = Vector3.new(1,1,math.abs(adj))
    adj_part.CFrame = offset*CFrame.new(0,0,-pos_sub.Z/2)*CFrame.Angles(0,0,0)

    opp_part.Size = Vector3.new(1,math.abs(opp),1)
    opp_part.CFrame = offset*CFrame.new(0,-pos_sub.Y/2,-pos_sub.Z)*CFrame.Angles(0,0,0)
end

while true do
    task.wait()
    update()
end