Subversion Repositories eFlore/Projets.eflore-projets

Rev

Go to most recent revision | Details | Last modification | View Log | RSS feed

Rev Author Line No. Line
1001 delphine 1
<?php
2
/**
3
 * Author : Julien Moquet
4
 *
5
 * Inspired by Proj4php from Mike Adair madairATdmsolutions.ca
6
 *                      and Richard Greenwood rich@greenwoodma$p->com
7
 * License: LGPL as per: http://www.gnu.org/copyleft/lesser.html
8
 */
9
/* similar to equi.js FIXME proj4 uses eqc */
10
class Proj4phpProjEqc {
11
 
12
    public function init() {
13
 
14
        if( !$this->x0 )
15
            $this->x0 = 0;
16
        if( !$this->y0 )
17
            $this->y0 = 0;
18
        if( !$this->lat0 )
19
            $this->lat0 = 0;
20
        if( !$this->long0 )
21
            $this->long0 = 0;
22
        if( !$this->lat_ts )
23
            $this->lat_ts = 0;
24
        if( !$this->title )
25
            $this->title = "Equidistant Cylindrical (Plate Carre)";
26
 
27
        $this->rc = cos( $this->lat_ts );
28
    }
29
 
30
    // forward equations--mapping lat,long to x,y
31
    // -----------------------------------------------------------------
32
    public function forward( $p ) {
33
 
34
        $lon = $p->x;
35
        $lat = $p->y;
36
 
37
        $dlon = Proj4php::$common->adjust_lon( $lon - $this->long0 );
38
        $dlat = Proj4php::$common . adjust_lat( $lat - $this->lat0 );
39
        $p->x = $this->x0 + ($this->a * $dlon * $this->rc);
40
        $p->y = $this->y0 + ($this->a * $dlat );
41
        return $p;
42
    }
43
 
44
    // inverse equations--mapping x,y to lat/long
45
    // -----------------------------------------------------------------
46
    public function inverse( $p ) {
47
 
48
        $x = $p->x;
49
        $y = $p->y;
50
 
51
        $p->x = Proj4php::$common->adjust_lon( $this->long0 + (($x - $this->x0) / ($this->a * $this->rc)) );
52
        $p->y = Proj4php::$common->adjust_lat( $this->lat0 + (($y - $this->y0) / ($this->a )) );
53
        return $p;
54
    }
55
 
56
}
57
 
58
Proj4php::$proj['eqc'] = new Proj4phpProjEqc();