Class for coordinate transforms between coordinate systems. Depends on the proj4js library. If proj4js is not available, then this is just an empty stub.
| OpenLayers. Projection | Class for coordinate transforms between coordinate systems. |
| Constructor | |
| OpenLayers. Projection | This class offers several methods for interacting with a wrapped pro4js projection object. |
| Functions | |
| getCode | Get the string SRS code. |
| getUnits | Get the units string for the projection -- returns null if proj4js is not available. |
| addTransform | Set a custom transform method between two projections. |
| transform | Transform a point coordinate from one projection to another. |
This class offers several methods for interacting with a wrapped pro4js projection object.
| projCode | {String} A string identifying the Well Known Identifier for the projection. |
| options | {Object} An optional object to set additional properties on the layer. |
{OpenLayers.Projection} A projection object.
OpenLayers.Projection.addTransform = function( from, to, method )
Set a custom transform method between two projections. Use this method in cases where the proj4js lib is not available or where custom projections need to be handled.
| from | {String} The code for the source projection |
| to | {String} the code for the destination projection |
| method | {Function} A function that takes a point as an argument and transforms that point from the source to the destination projection in place. The original point should be modified. |
OpenLayers.Projection.transform = function( point, source, dest )
Transform a point coordinate from one projection to another. Note that the input point is transformed in place.
| point | {{OpenLayers.Geometry.Point> | Object} An object with x and y properties representing coordinates in those dimensions. |
| sourceProj | {OpenLayers.Projection} Source map coordinate system |
| destProj | {OpenLayers.Projection} Destination map coordinate system |
| point | {object} A transformed coordinate. The original point is modified. |
Get the string SRS code.
getCode: function()
Get the units string for the projection -- returns null if proj4js is not available.
getUnits: function()
Set a custom transform method between two projections.
OpenLayers.Projection.addTransform = function( from, to, method )
Transform a point coordinate from one projection to another.
OpenLayers.Projection.transform = function( point, source, dest )