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Manual Reference Pages  - area_of_simple_polygon (1)

NAME
area_of_simple_polygon(1f) - determine area of simple (non-intersecting) polygon given coordinates of points (LICENSE:PD)

CONTENTS

Synopsis
Description
Options
Example
Author
License

SYNOPSIS
area_of_simple_polygon [file(s)|[ --help| --version]]

DESCRIPTION
read file(s) composed of lines of xy pairs and calculate area of polygon, assuming points define a simple (non-intersecting) polygon. If not closed, the last point will be connected to the first point.

Shows example of reading arguments from command line of arbitrary length and files of numbers of arbitrary size.

OPTIONS
filenames
  name of files containing xy pairs defining a simple polygon
--help display this help and exit
--version
  output version information and exit

EXAMPLE
Given file in.1 with the following contents: 

   -5 -5
   0 0
   -5 5
   5 5
   0 0
   5 -5
Expected output: 

             14           7           2
-5.0000000000000000 -5.0000000000000000 0.0000000000000000 0.0000000000000000 -5.0000000000000000 5.0000000000000000 5.0000000000000000 5.0000000000000000 0.0000000000000000 0.0000000000000000 5.0000000000000000 -5.0000000000000000
area= -50.000000000000000

AUTHOR
John S. Urban

LICENSE
Public Domain

area_of_simple_polygon (1) March 11, 2021
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