Pointing an object at my mouse, but it isn't pointing in the right way

Question

So I'm trying to make a circular pong game and I'm making the paddle at the moment

In my main.lua, I have this code inside love.update:

pad:update(
function(dt,self)
    local mouseX,mouseY=love.mouse.getPosition()
    self.rot=math.atan2((mouseY - self.y), (mouseX - self.x))
    self.x = circleRadius*math.cos(self.r) + self.orgX;
    self.y = circleRadius*math.sin(self.r) + self.orgY;
    self.r=self.r+.5*dt


end,
dt
)

(Paddle.lua, the paddle file, executes the function given by the caller continuously in the update function)

It does point towards the mouse, but not in the way I want it to. Currently, it's like this (badly illustrated since snipping tool doesn't capture the mouse so I have to draw where it would be)

Instead, I want it like this

The anchor point of the paddle is in the middle as in it's offset on the x and y axis by half the width and height, respectively. (it's a image file, since you can't really rotated love.graphics.rectangle objects)

Anyone know how to fix this?

Answer 1

To rotate additional 90°, replace

self.rot=math.atan2((mouseY - self.y), (mouseX - self.x))

with

self.rot=math.atan2((mouseX - self.x), -(mouseY - self.y))