Leaflet.print

============== Implements the Mapfish print protocol allowing a Leaflet map to be printed using either the Mapfish or GeoServer print module.

This plugin is inspired by the printing features of the GeoExt library. It also borrows from the visual style of the Leaflet.draw plugin.

Currently the following layer types are supported:

• Marker
• TileLayer
• TileLayer.WMS
• Mapbox.TileLayer
• ImageOverlay
• Polyline
• MultiPolyline
• Polygon
• MultiPolygon
• Circle

Requires Leaflet 0.6.0 or newer and jQuery.

Using the plugin

The plugin consists of a print provider, which implements the protocol used by the MapFish print module and optionally loads the service capabilities document, and a map control that prints the current map view using the user's choice of document layout.

Usage

Create a print provider, optionally create a print control and add it to the map.

var printProvider = L.print.provider({
   method: 'GET',
   url: ' http://path/to/mapfish/print',
   autoLoad: true,
   dpi: 90
});

var printControl = L.control.print({
   provider: printProvider
});        
map.addControl(printControl);

All Options

Print Provider Options:

Option	Type	Default	Description
map	L.Map	undefined	The map that will be printed. Not required if using with the print control.
url	String	undefined	The base url for the print service. Only required if capabilities is not provided. This is usually something like http://path/to/mapfish/print for Mapfish, and http://path/to/geoserver/pdf for GeoServer with the printing extension installed.
proxy	String	undefined	Url for a local resource that will proxy the request for the print service. The print service url will be passed as the "url" parameter on the request.
method	String	'POST'	The HTTP method to use to request the printed map.
autoLoad	Bool	false	If true the print provider will load the capabilities document upon instantiation. Cannot be used with the "capabilities" option.
autoOpen	Bool	true	If true the printed map will be automatically opened. Applies to POST requests only.
capabilities	Object	undefined	The capabilities of the print service. Only required if url is not provided. This is the object returned by the "info.json" endpoint of the print service, and is usually obtained by including a script tag pointing to http://path/to/mapfish/print/info.json?var=myvar in the head of the html document.
outputFormat	String	'pdf'	The document format for the printed map.
outputFilename	String	'leaflet-map'	The filename for the printed map.
layout	String	undefined	Name of a layout supported by the print service to use as the default layout when print() is called without a layout specified. If not provided will use the name of the first layout defined in the service capabilites.
dpi	Number	undefined	The resolution to use for the printed map, defaults to the first dpi value supported by the print service.
rotation	Number	0	The rotation of the page.
customParams	Object	{}	Key value pairs of additional parameters that will be sent to the print service.
listeners	Object	undefined	A set of type/listener pairs, the function context can be passed using the "context" property of the event map e.g. `{beforeprint: onBeforePrint, print: onPrint, context: window}.
legends	Bool	false	Should WMS legends be generated for all WMS layers? Note that layers with multiple symbols (eg. classified layers) may not work well with MapFish's legend by default.

Print Control Options:

Option	Type	Default	Description
position	String	'topleft'	The initial position of the control (one of the map corners). See control positions.
showLayouts	Bool	true	If true the layouts supported by the print service will be displayed when the user clicks the print control, otherwise the map will be printed using the layout the print provider was configured with.

Methods

Print Provider Methods:

loadCapabilities()

Loads the capabilities for the print service. The url config option must have been specified and the autoLoad config option set to false.

print(options)

Prints the current map view using the specified options. Valid options are: proxy, method, outputFormat, outputFilename, layout, dpi, rotation, customParams javascript getCapabilities()

Gets the capabilities object the provider has been configured with.
````javascript
setMap()

Sets a Leaflet.Map object on the provider. When using with print control this will be done for you.

setDpi()

Sets the resolution for the printed map. Must be a valid dpi supported by the print service.

setLayout()

Sets the name of the layout to use for the printed map.

setRotation()

Sets the rotation of the printed map.

Events

The following events are emitted by the print provider and can be listened for using the standard Leaflet events methods or by passing an event map as the listeners config option.

capabilitiesload

Fired when the print service capabilities have been loaded by a call to loadCapabilities().

Property	Type	Description
provider	L.print.Provider	The print provider.
capabilities	Object	The service capabilities.

beforeprint

Fired before the printed map is requested.

Property	Type	Description
provider	L.print.Provider	The print provider.
map	L.Map	The map to be printed.

print

Fired immediately after the printed map has been requested if using HTTP GET or upon success if using HTTP POST.

Property	Type	Description
provider	L.print.Provider	The print provider.
response	Object	The reponse object returned by the print service. The url for the generated map is accessed though the getURL property.

printexception

Fired when the print request fails.

Property	Type	Description
provider	L.print.Provider	The print provider.
response	jqXHR	The jqXHR object.

dpichange

Fired when the provider's dpi value is changed via setDpi().

Property	Type	Description
provider	L.print.Provider	The print provider.
dpi	Number	The new dpi value.

layoutchange

Fired when the provider's layout value is changed via setLayout().

Property	Type	Description
provider	L.print.Provider	The print provider.
layout	String	The new layout value.

rotationchange

Fired when the provider's rotation value is changed via setRotation().

Property	Type	Description
provider	L.print.Provider	The print provider.
rotation	Number	The new rotation value.

Limitations

• dashArray style cannot be easily mapped onto OpenLayers strokeDashstyle constants so is not supported.
• Marker shadow is not drawn.
• Rectangle layer does not provide a toGeoJSON() method so is not supported.

License

This software is released under the MIT licence.