Math::Polygon::Surface3pm

Constructors

$obj->new( [%options], [@polygons], %options )

Math::Polygon::Surface->new( [%options], [@polygons], %options )

You may merge %options with @polygons. You may also use the "outer" and "inner" options.

Each polygon is a references to an ARRAY of points, each an ARRAY of X and Y, but better pass Math::Polygon objects.

 -Option--Default
  inner   []
  outer   undef

inner => \@polygons

The inner polygons, zero or more Math::Polygon objects.

outer => $polygon

The outer polygon, a Math::Polygon.

Attributes

Simple calculations

area()

Returns the area enclosed by the outer polygon, minus the areas of the inner polygons. See method Math::Polygon::area().

$obj->bbox()

Returns a list with four elements: (xmin, ymin, xmax, ymax), which describe the bounding box of the surface, which is the bbox of the outer polygon. See method Math::Polygon::bbox().

$obj->perimeter()

The length of the border: sums outer and inner perimeters. See method Math::Polygon::perimeter().

Clipping

$obj->fillClip1($box)

Clipping a polygon into rectangles can be done in various ways. With this algorithm, the parts of the polygon which are outside the $box are mapped on the borders.

All polygons are treated separately.

$obj->lineClip($box)

Returned is a list of ARRAYS-OF-POINTS containing line pieces from the input surface. Lines from outer and inner polygons are undistinguishable. See method Math::Polygon::lineClip().

$obj->string()

Translate the surface structure into some string. Use Geo::WKT if you need a standardized format.

Returned is a single string possibly containing multiple lines. The first line is the outer, the other lines represent the inner polygons.