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<?php
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/**
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 * Author : Julien Moquet
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 *
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 * Inspired by Proj4php from Mike Adair madairATdmsolutions.ca
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 *                      and Richard Greenwood rich@greenwoodma$p->com
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 * License: LGPL as per: http://www.gnu.org/copyleft/lesser.html
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 */
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/* similar to equi.js FIXME proj4 uses eqc */
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class Proj4phpProjEqc {
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    public function init() {
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        if( !$this->x0 )
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            $this->x0 = 0;
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        if( !$this->y0 )
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            $this->y0 = 0;
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        if( !$this->lat0 )
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            $this->lat0 = 0;
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        if( !$this->long0 )
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            $this->long0 = 0;
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        if( !$this->lat_ts )
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            $this->lat_ts = 0;
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        if( !$this->title )
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            $this->title = "Equidistant Cylindrical (Plate Carre)";
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        $this->rc = cos( $this->lat_ts );
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    }
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    // forward equations--mapping lat,long to x,y
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    // -----------------------------------------------------------------
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    public function forward( $p ) {
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        $lon = $p->x;
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        $lat = $p->y;
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        $dlon = Proj4php::$common->adjust_lon( $lon - $this->long0 );
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        $dlat = Proj4php::$common . adjust_lat( $lat - $this->lat0 );
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        $p->x = $this->x0 + ($this->a * $dlon * $this->rc);
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        $p->y = $this->y0 + ($this->a * $dlat );
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        return $p;
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    }
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    // inverse equations--mapping x,y to lat/long
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    // -----------------------------------------------------------------
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    public function inverse( $p ) {
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        $x = $p->x;
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        $y = $p->y;
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        $p->x = Proj4php::$common->adjust_lon( $this->long0 + (($x - $this->x0) / ($this->a * $this->rc)) );
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        $p->y = Proj4php::$common->adjust_lat( $this->lat0 + (($y - $this->y0) / ($this->a )) );
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        return $p;
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    }
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}
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Proj4php::$proj['eqc'] = new Proj4phpProjEqc();