LOGO inspired graphics lang

Intro

Idea is to have a very simple language which is able to create line graphics.

Commands are single letter
Parameters are single integers
Language is imperative where each command is executed from first to last
Language is stateful where current state is important for execution following commands
Scale of output is adapted so that total image fits within view
Drawing always start at origo with direction along x axis (0 degrees)
Comments are started by #
Reserved keywords are M,T,S,C,W,D,N,F,H,R and symbols #,(,)

Language

Movement

Mx = (m)ove by distance x
Tx = (t)urn by x degrees (values < 180 is left turn)

Pen state

Px = set (p)en color to x
Fx = set (f)ill color to x
Wx = set pen (w)idth to x
Sx = (s)cale by x percent

Draw

Lx = draw line by distance x
Cx = draw circle with radius x

Flow control

Nx() = repeat expression
Gx() = define group identified by x 
Gx   = call group identified by x
H    = halt execution here
R    = return to origo at 0 angle and reset pen state

Comments

#   = comment line
#() = inline comment

Example

Flower

N8(L50 T40 L50 T140 L50 T40 L50 T185)

Program format

Commands is formatted as one of 3 classes

Single letter like:

H
R

Single letter plus one integer argument like

M123
T45

Single letter plus one integer argument plus one expression argument like

N4(L10T90)

Commands are entered in a sequence with optional space and/or comments between them.

This example

N8(
  # flower leaf
  L50T20
  L50T140
  L50T20
  L50
  # set new direction to 45
  T185
)

is equivalent with this

N8(L50 T40 L50 T140 L50 T40 L50 T185)

which looks like this:

wishline flower

Editor