Factorio Forums

When playing on large screen and with extended reach mods, its intuitive to want to paint large lines of belts at once.
Currently with larger zoom out, its impossible to keep the lines straight and a lot of strayed misplaced belts are often produced.

Locking the mouse allowed movement to belt selected direction when mouse is pressed and allowing only forward, backward movement until the button is depressed would get rid of misplaced belts and the need to click and run along the intended belt route.

One way to do this is by using xmouse button control. In the settings, you can set modifier keys to lock the x or y axis. In mine, I have it set to Ctrl+Shift and Ctrl+Alt; when held down, these lock the mouse to the x or y axis.