MetaFun - Pragma ADE

20
The new (sub)path is a new path with its own points that start numbering at zero. The next graphic
shows both the original and the subpath from point 1 upto 3.
0
4
10
32
"(z0..z1..z2..z3..cycle)"
"subpath(1,3)"
Welcome to MetaPost Constructing paths
21
In spite of what you may think, a point is not fixed. This is why in METAPOST a point along a path is
officially called a time. The next example demonstrates that we can specify any time on the path.
0
4
2
1
31
0
2
"(z0..z1..z2..z3..cycle)"
"subpath(2.45,3.85)"
Often we want to take a slice starting at a specific point. This is provided by cutafter and its
companion cutbefore. Watch out, this time we use a non--cyclic path.
0
1
3
2
"(z0..z1..z2..z3)"
When you use cutafter and cutbefore it really helps if you know in what direction the path runs.