Hello! I can rotate an object on the screen using the mouse location and the

atan2

function. As soon as I begin the rotation, the object jumps to point at the mouse location (rotation angle follows mouse angle), but I want to be able to rotate the object relative to the mouse angle. I can measure the difference between the current rotation, and the mouse angle when the rotation begins, but I cant make the

diff

value remain constant during the rotation! I need to learn how you set a value once from other variables without it then constantly updating itself. Can someone show me how? Thanks!

What graphical framework are you using?

I'm using Compose for Desktop.

there seems to be a #compose-desktop channel here on slack that might be a better place to ask.

I really just need to know how to set a variable once from other variables, then have it become temporarily read-only, so it doesn't continuously recalculate itself based on the other variables changing. This needs to happen regularly, not just once on app startup for example.