Ideas

MetaFun Interface

Relevant things (from the first chapter of the MetaFun manual):

low level:
- paths (ex: (1cm,1cm)..controls (.5cm,2cm) and (2.5cm,2cm)..(2cm,.5cm)..cycle)
- transformations (ex: ... slanted 1.5 shifted/scaled/xscaled/yscaled/zscaled/slanted/rotate ...)
- angles
- drawing
- dashes
- pens
- colors (withcolor (.4,.5,.6))
- text
- clipping, cutting and pasting
- current picture
control flow:
- variables
- conditions
- loops
  - joining lines
- macros
- arguments
- ex: linear equations

Ignore the control flow elements.