Wpolygon

Conversion functions wpolygon

syntax

• wpolygon(a)

definition

wpolygon(a) converts the coordinates of a point item a with a sequence of points (Arc or Polygon) to the wpoint (uint16 coordinates) Value type.

Since GeoDms 20.15.1 the result keeps the composition type of its argument: polygon stays polygon, arc stays arc, multipoint stays multipoint (as Convert does since 20.3.0, issue 1038). In earlier versions the result was always treated as arc, so casting a polygon Data item made polygon-consuming operators such as bp_union_polygon warn about arc geometry.

applies to

• data item with Point value type and composition type arc or polygon

example

attribute<wpoint> wpolygonA (SDomain, polygon) := wpolygon(A);

A(fpolygon)	wpolygonA
{2:xy(0; 0),xy(1; 1)}	{2:xy(0; 0),xy(1; 1)}
{3: {1E+007,1E+007},{-2.5,-2.5},{99.9,99.9}}	{3: {null,null},{null,null},xy(99; 99)}