Screen size

[emfril]

I have written a program that reads the coastline coordinates of the continents and prints custom perspectives. I've been using SCREEN 12, which is 320x240 pixels:

https://emf.neocities.org/tmp/WestCiv.png

I would like to make the screen bigger, but if I use the _FULSCREEN command the image is distortedQ

https://emf.neocities.org/tmp/WestCiv2.png

I could of course change the code so that the full screen is not distorted. But I wonder: Is there a way to  make it as big as possible but preserve the aspect ratio?

And, even better: can I specify the size of a (larger) screen in pixels? I would certainly like to increase the shight of the image to that of my screen and have a better resolution.

Thanks.