Changes between Version 1 and Version 2 of UserGuide

Timestamp:

Jun 4, 2008, 8:09:58 PM (16 years ago)

Author:

madair

Comment:

--

UserGuide

@@ -3 +3 @@
 Using Proj4js is a matter of including the library in your page, creating source and destination Proj objects, transforming point coordinates.  
 
-
 {{{
 
-<script src="lib/proj4js-combined.js"></script>
+<script src="lib/proj4js-combined.js"></script>  //adjust the path for your server
 
 …
-var source = new Proj4js.Proj(‘EPSG:4236’);
-var dest = new Proj4js.Proj(‘EPSG:42304’);
-var p = new Proj4js.Point(-76.0,45.0);
-Proj4js.transform(source, dest, p);
+//somewhere in your JavaScript code where you need this
+
+var source = new Proj4js.Proj(‘EPSG:4236’);    //source coordinates will be in Longitude/Latitude
+var dest = new Proj4js.Proj(‘EPSG:27563’);     //destination coordinates in LCC, south of France
+
+var p = new Proj4js.Point(-76.0,45.0);   //any object will do as long as it has 'x' and 'y' properties
+Proj4js.transform(source, dest, p);      //do the transformation.  x and y are modified in place
+
+//p.x and p.y are now EPSG:27563 easting and northing in meters
 …
 
 }}}
 
-p.x and p.y are now EPSG:42304 easting and northing in meters
+== Proj4js.Proj constructor ==
+
+Every Proj object must be initialized with the parameters of the CRS to be used.  Proj4js uses the same initialization parameters that PROJ4 uses [link].
+
+The argument to the constructor is a key in the Proj4js.defs initialization parameters object.
 
 
-Every Proj object must be initialized with the parameters of the CRS to be used.
+{{{
+Proj4js.defs["EPSG:27563"]="+title=LAMB sud france  +proj=lcc +lat_1=44.1 +lat_0=44.1 +lon_0=0 +k_0=0.999877499 +x_0=600000 +y_0=200000 +a=6378249.2 +b=6356515 +towgs84=-168,-60,320,0,0,0,0 +pm=paris +units=m";
+}}}
+
 
 == If you know the projections to be used in your application ==
 
-<script src="lib/defs/EPSG42304.js"></script >
+The Proj4js.defs value must be defined before the constructor is called.  You can define these via the script tag (see examples in the lib/defs directory) or anywhere else in your application.
 
 
+{{{
+<script src="lib/defs/EPSG27563.js"></script >
+}}}
+
 == Using dynamic lookup of initialization parameters ==
+
+set libPath
+set proxy
+spatialreference.org