CL-PROJ: Lisp bindings for the Proj.4 library
=============================================

PROJ.4 is a cartographic projections library originally written by
Gerald Evenden then of the USGS. PROJ.4 has been placed under an MIT
license.

CL-PROJ provides CFFI-based Common Lisp bindings for the PROJ.4
library. It is placed under the Berkeley Software Distribution (BSD)
license meaning that you can do almost everything you want with it.

PROJ.4 homepage is: [proj4.org](http://proj4.org/)

Original CL-PROJ homepage was at the
[cl-proj.sourceforge.net](http://cl-proj.sourceforge.net/), but
current development and documentation is [at the
Bitbucket](https://bitbucket.org/vityok/cl-proj).

`cl-proj` can be installed using the
[Quicklisp](https://www.quicklisp.org/) system:

    (ql:quicload :cl-proj)


Usage
=====

Library loading and linking into the Lisp image is performed
automatically when it is loaded by ASDF/QuickLisp.

Symbols are defined in the `cl-proj` package and are also available
using the `pj` package nickname.

Constants, variables and functions are extremely close to the
PROJ.4. Bindings for geodesic functions are also provided in addition
to the core Proj4 API. Reference is in the <api.html> file that is
supplied in the distribution.

Primary development platform is recent Ubuntu Linux distribution with
recent versions of SBCL and ECL Common Lisps.

In addition to Proj4 library bindings this package a number of utility
functions, including:

* Parsing degrees from a string and conversion between
  degree-minutes-seconds and decimal representations

* Simplification of polygons/polylines (reducing number of vertices)
  using the Ramer–Douglas–Peucker algorithm

* Projecting points from a geographic space onto a screen with the
  given dimensions and viewport

* Construction of circular lines with the given radius and center
  (like missile ranges, etc.)

This package has been used to produce some maps in the
[collection-of-maps](https://bitbucket.org/vityok/collection-of-maps)
([Wiki](https://bitbucket.org/vityok/collection-of-maps/wiki/Home)).


Copying
=======

    Copyright (c) 2012,2015,2017 Victor Anyakin <anyakinvictor@yahoo.com>
    All rights reserved.

    Redistribution and use in source and binary forms, with or without
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