All well and nice, but it doesn't explain how to actually DRAW something! I used to write a lot of text in Latex, and used metapost/tikz/pgf to draw box and arr

All well and nice, but it doesn't explain how to actually DRAW something! I used to write a lot of text in Latex, and used metapost/tikz/pgf to draw box and arrows diagrams. Drawing straight lines was OK, but trying to make nice curved arrows going around nodes was a PITA and based mostly on experimenting. I knew where to find the math behind Bezier curves, but it was (and still is!) mostly useless from the perspective of a "end-user" not using a GUI.