Texture position lags behind cursor

[x2infinity]

Hey,

I've been using the StarCursor addon but I noticed the texture lags behind the cursor when moving the mouse. I'd rather it fix to the cursor position. Here is the code for the addon:

local frame = CreateFrame("Frame", nil, UIParent);
frame:SetFrameStrata("TOOLTIP");
local texture = frame:CreateTexture();
texture:SetTexture([[Interface\Cooldown\star4]]);
--texture:SetVertexColor(1, 0, 0,.5);
texture:SetBlendMode("ADD");
texture:SetAlpha(0.4);
local x = 0;
local y = 0;
local speed = 0;
 
local function OnUpdate(_, elapsed)
  --Somehow speed or something else is getting to -nan, reset if so (temporary fix by raymar_of_brovaria)
  if speed + 1 == speed then
    speed = 0
  end
  if x + 1 == x then
    x = 0
  end
  if y + 1 == y then
    y = 0
  end
  --end of temp fix
--local function OnUpdate(_, elapsed)
  local dX = x;
  local dY = y;
  x, y = GetCursorPosition();
  dX = x - dX;
  dY = y - dY;
  local weight = 2048 ^ -elapsed;
  speed = math.min(weight * speed + (1 - weight) * math.sqrt(dX * dX + dY * dY) / elapsed, 1024);
  local size = speed / 8 - 16;
  if (size > 0) then
    local scale = UIParent:GetEffectiveScale();
    texture:SetHeight(size);
    texture:SetWidth(size);
    texture:SetPoint("CENTER", UIParent, "BOTTOMLEFT", (x + 0.5 * dX) / scale, (y + 0.5 * dY) / scale);
    texture:Show();
  else
    texture:Hide();
  end
end
frame:SetScript("OnUpdate", OnUpdate);

I've tried playing with SetPoint but haven't been able to figure it out.

EDIT: Ok so I've figured out the issue seems to be framerate, if I lock my frames the texture stays on the cursor as intended, if I uncap the framerate the texture will begin to lag behind the cursor. I'm going to assume this has something to do with how updating the position works and isn't something you can change via the addon? But I'll leave this up in case someone knows how this works.

[Sharpedge]

Try this and see if it helps:

local frame = CreateFrame("Frame", nil, UIParent);
frame:SetFrameStrata("TOOLTIP");
local texture = frame:CreateTexture();
texture:SetTexture([[Interface\Cooldown\star4]]);
texture:SetBlendMode("ADD");
texture:SetAlpha(0.5);

local x, y, speed = 0, 0, 0;
local MAX_SPEED = 1024;
local SPEED_DECAY = 2048;
local SIZE_MODIFIER = 6;
local MIN_SIZE = 16;

local function isNan(value)
  return value ~= value;
end

local function OnUpdate(_, elapsed)
  if isNan(speed) then speed = 0; end
  if isNan(x) then x = 0; end
  if isNan(y) then y = 0; end

  local prevX, prevY = x, y;
  x, y = GetCursorPosition();
  local dX, dY = x - prevX, y - prevY;

  local distance = math.sqrt(dX * dX + dY * dY);
  local decayFactor = SPEED_DECAY ^ -elapsed;
  speed = math.min(decayFactor * speed + (1 - decayFactor) * distance / elapsed, MAX_SPEED);

  local size = speed / SIZE_MODIFIER - MIN_SIZE;
  if size > 0 then
    local scale = UIParent:GetEffectiveScale();
    texture:SetHeight(size);
    texture:SetWidth(size);
    texture:SetPoint("CENTER", UIParent, "BOTTOMLEFT", (x + 0.5 * dX) / scale, (y + 0.5 * dY) / scale);
    texture:Show();
  else
    texture:Hide();
  end
end

frame:SetScript("OnUpdate", OnUpdate);

[SDPhantom]

This is basically the difference between hardware and software cursor settings in many games. Anything rendered by the game is always going to have significant latency added on top of what the OS is doing.