walkmap.path
Essentially the specification for things we shall consider to be path. Note that for these purposes path means any continuous linear feature, where such features specifically include watercourses.
length
(length path)Return the length of this path, in metres. Note that 1. This is not the same as the distance from the start to the end of the path, which, except for absolutely straight paths, will be shorter; 2. It is not even quite the same as the length of the path as rendered, since paths will generally be rendered as spline curves.
path->edges
(path->edges o)if o is a path, a polygon, or a sequence of vertices, return a sequence of edges representing that path, polygon or sequence.
Throws IllegalArgumentException if o is not a path, a polygon, or sequence of vertices.
path?
(path? o)True if o satisfies the conditions for a path. A path shall be a map having the key :vertices, whose value shall be a sequence of vertices as defined in walkmap.vertex.
polygon->path
(polygon->path o)If o is a polygon, return an equivalent path. What’s different about a path is that in polygons there is an implicit edge between the first vertex and the last. In paths, there isn’t, so we need to add that edge explicitly.
If o is not a polygon, will throw an exception.