# new-generics

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##### Generics/Methods for polygon objects

Some generic functions and methods for polygon objects

Keywords
methods
##### Usage
append.poly(x, y)
area.poly(object, …)
get.pts(object)
get.bbox(x)
scale.poly(x, …)
tristrip(x)
triangulate(x)
##### Arguments
x,object

A polygon object

y

A polygon object

Other arguments passed to methods

##### Details

The result of tristrip(x) is a list of two-column matrices. Each matrix is a tristrip, i.e. the rows are vertices of triangles, with each overlapping triple of rows corresponding to a separate triangle.

The result of triangulate(x) is a single two-column matrix. The rows are vertices of triangles, taken in non-overlapping triples.

##### Methods

append.poly

signature(x = "gpc.poly", y = "gpc.poly"): Combine all contours of two "gpc.poly" objects and return the combined polygon as a "gpc.poly" object.

area.poly

signature(object = "gpc.poly"): Compute and return the sum of the areas of all contours in a "gpc.poly" object.

scale.poly

signature(x = "gpc.poly"): Scale (divide) the x and y coordinates of a "gpc.poly" object by the amount xscale and yscale, respectively. Return a scaled "gpc.poly" object.

get.pts

signature(object = "gpc.poly"): Return the list of x and y coordinates of the vertices of a "gpc.poly" object.

get.bbox

signature(x = "gpc.poly"): Return the bounding box for a "gpc.poly" object.

tristrip

signature(x = "gpc.poly"): Return a tristrip list for a "gpc.poly" object.

triangulate

signature(x = "gpc.poly"): Return a matrix of vertices of a triangulation of a "gpc.poly" object.

"gpc.poly" class documentation.

##### Aliases
• new-generics
• append.poly
• append.poly-methods
• get.bbox
• get.bbox-methods
• area.poly
• area.poly-methods
• get.pts
• get.pts-methods
• scale.poly
• scale.poly-methods
• tristrip
• tristrip-methods
• triangulate
• triangulate-methods
##### Examples
# NOT RUN {