this has some buttons on the screen for drawing and moving the map around.
https://patchstorage.com/pmpd-wheel-physics-pd-vanilla-gem-pmpd/

This is how I set up a linux debian for pd and how to install GEM from terminal and PMPD-tar , how to get programs from debian package installer / gimp etc lots `of pictures
https://patchstorage.com/how-to-install-linux-mx-for-pd-gem-pmpd-my-setup/