Usually when you're writing in LaTeX you want some pretty illustrations. Right now for geometry figures I use GeoGebra, which is easy enough; but I usually see better figures on other papers.
Plus, it is not all about geometry: I would like to easily make some custom drawing, so the software should allow me to "write" on the screen (a bit like MSPaint does; but paint looks horrible)
For example say I want to create on the pc this image:
How do I do that? (This one has been written down on paper and then scanned)
Any help or advice is appreciated.