polygon abstract method
Writes a polygon geometry with one exterior and 0 to N interior rings
.
The rings
iterable must be non-empty. The first element is the exterior
ring, and any other rings are interior rings (or holes). All rings must be
closed linear rings. As specified by GeoJSON, they should "follow the
right-hand rule with respect to the area it bounds, i.e., exterior rings
are counterclockwise, and holes are clockwise".
Use an optional name
to specify a name for a geometry (when applicable).
An optional bounds
can used set a minimum bounding box for a geometry
written. A writer implementation may use it or ignore it.
An example to write a polygon geometry with one linear ring containing 4 points:
content.polygon(
// an array of linear rings
[
// a linear ring as a flat structure with four (x, y) points
[
10.1, 10.1,
5.0, 9.0,
12.0, 4.0,
10.1, 10.1,
].positions(Coords.xy),
],
);
Implementation
void polygon(
Iterable<PositionSeries> rings, {
String? name,
Box? bounds,
});