multiPolygon abstract method

void multiPolygon(Iterable<Iterable<Iterable<double>>> polygons, { required Coords type, String? name, Iterable<double>? bounds, })

Writes a multi polygon with an array of polygons (each with an array of rings).

Use the required type to explicitely specify the type of coordinates.

Each polygon is represented by Iterable<Iterable<double>> instances containing one exterior and 0 to N interior rings. 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".

Each ring in the polygon is represented by Iterable<double> arrays. Such arrays contain coordinate values as a flat structure. For example for Coords.xyz the first three coordinate values are x, y and z of the first position, the next three coordinate values are x, y and z of the second position, and so on.

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. Supported coordinate value combinations by coordinate type:

Type	Expected values
xy	minX, minY, maxX, maxY
xyz	minX, minY, minZ, maxX, maxY, maxZ
xym	minX, minY, minM, maxX, maxY, maxM
xyzm	minX, minY, minZ, minM, maxX, maxY, maxZ, maxM

An example to write a multi polygon geometry with two polygons:

 content.multiPolygon(
     // an array of polygons
     [
       // an array of linear rings of the first polygon
       [
         // 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,
         ],
       ],
       // an array of linear rings of the second polygon
       [
         // a linear ring as a flat structure with four (x, y) points
         [
           110.1, 110.1,
           15.0, 19.0,
           112.0, 14.0,
           110.1, 110.1,
         ],
       ],
     ],
 );

Implementation

void multiPolygon(
  Iterable<Iterable<Iterable<double>>> polygons, {
  required Coords type,
  String? name,
  Iterable<double>? bounds,
});