Would using mouse position in the below scenario generate true random numbers? I'm having trouble wrapping my head around random number generation so I figure it would be better to ask now, rather than screw up later.

Let's say I want to write a function that generates a random lucky number from 0-9 when the user clicks on a button.

I'm thinking of using the last digit of the multiple of the x and y coordinates of the click position as the output.

Assuming that the user have no intention of gaming the output, would this be true randomness because there's no way for a 3rd party to predict where on the button the user will click next?
Usually, mouse click position is highly correlated. Just as an example, take a look to a typical mouse interaction with a browser:



So, the use of raw mouse click positions without pre-whitening is discouraged.