jail the mouse to a specific rectangle. Based on xdotool.

mousejail.sh

#!/bin/bash

SLEEPTIME=0.2

# JAIL PARAMETERS
MAXX=1024
MAXY=768
BOUNDSCREEN=0

while true; do
    eval $(xdotool getmouselocation --shell 2>/dev/null)
    echo $X, $Y, $SCREEN
    NEWX=$X
    NEWY=$Y
    JAIL=0
    if (($X > $MAXX)); then NEWX=$MAXX; JAIL=1; fi
    if (($Y > $MAXY)); then NEWY=$MAXY; JAIL=1; fi
    if (($SCREEN != $BOUNDSCREEN)); then JAIL=1; fi
    if (($JAIL == 1)); then
        xdotool mousemove --screen $BOUNDSCREEN $NEWX $NEWY
    fi
    sleep $SLEEPTIME
done