I'm surprised nobody else has responded to this.
Drawing in VFX is as simple as abc.
For example:
BLACK PEN RED BRUSH \ Define your edge and fill colours
10 10 100 100 ELLIPSE \ Draw your circle by defining a bounding rectangle
You could easily define a word CIRCLE ( x,y,radius--- ) if you preferred.
There are, of course a few hoops to jump through first.
1. Make sure GTK is installed on your PC.
2. Switch VFX to 64 bit floats, needed by the Cairo graphics library - for some reason VFX come with 80 bit floats at the moment.
3. INCLUDE the GTK bindings and wrappers.
4. INCLUDE the CAIRO bindings and wrappers.
5. Code a little toy program that provides a surface for you to draw on.
An example program that does 2-5 for you, using the latest version of GTK, has been donated to VFX though I'm not sure if it's part of the distribution yet.
If you come to EuroForth 2025 I can show you exactly how it all works.