OpenLayers. Layer

{String}

{String}

{DOMElement}

{Boolean} If a layer’s display should not be scale-based, this should be set to true.  This will cause the layer, as an overlay, to always be ‘active’, by always returning true from the calculateInRange() function.

If not explicitly specified for a layer, its value will be determined on startup in initResolutions() based on whether or not any scale-specific properties have been set as options on the layer.  If no scale-specific options have been set on the layer, we assume that it should always be in range.

See #987 for more info.

{OpenLayers.Events}

{OpenLayers.Map} This variable is set when the layer is added to the map, via the accessor function setMap().

{Boolean} Whether or not the layer is a base layer.  This should be set individually by all subclasses.  Default is false

{Boolean} Display the layer’s name in the layer switcher.  Default is true.

{Boolean} The layer should be displayed in the map.  Default is true.

{String} Attribution string, displayed when an OpenLayers.Control.Attribution has been added to the map.

{Object} If set as an option at construction, the eventListeners object will be registered with <OpenLayers.Events.on>.  Object structure must be a listeners object as shown in the example for the events.on method.

{Integer} Determines the width (in pixels) of the gutter around image tiles to ignore.  By setting this property to a non-zero value, images will be requested that are wider and taller than the tile size by a value of 2 x gutter.  This allows artifacts of rendering at tile edges to be ignored.  Set a gutter value that is equal to half the size of the widest symbol that needs to be displayed.  Defaults to zero.  Non-tiled layers always have zero gutter.

{OpenLayers.Projection} or {String} Set in the layer options to override the default projection string this layer - also set maxExtent, maxResolution, and units if appropriate.  Can be either a string or an OpenLayers.Projection object when created -- will be converted to an object when setMap is called if a string is passed.

{String} The layer map units.  Defaults to ‘degrees’.  Possible values are ‘degrees’ (or ‘dd’), ‘m’, ‘ft’, ‘km’, ‘mi’, ‘inches’.

{Array} An array of map scales in descending order.  The values in the array correspond to the map scale denominator.  Note that these values only make sense if the display (monitor) resolution of the client is correctly guessed by whomever is configuring the application.  In addition, the units property must also be set.  Use resolutions instead wherever possible.

{Array} A list of map resolutions (map units per pixel) in descending order.  If this is not set in the layer constructor, it will be set based on other resolution related properties (maxExtent, maxResolution, maxScale, etc.).

{OpenLayers.Bounds} The center of these bounds will not stray outside of the viewport extent during panning.  In addition, if displayOutsideMaxExtent is set to false, data will not be requested that falls completely outside of these bounds.

{OpenLayers.Bounds}

{Float} Default max is 360 deg / 256 px, which corresponds to zoom level 0 on gmaps.  Specify a different value in the layer options if you are not using a geographic projection and displaying the whole world.

{Float}

{Integer}

{Float}

{Float}

{Boolean} Request map tiles that are completely outside of the max extent for this layer.  Defaults to false.

{Boolean} #487 for more info.

{String} The transition effect to use when the map is panned or zoomed.

There are currently two supported values

• null No transition effect (the default).
• resize Existing tiles are resized on zoom to provide a visual effect of the zoom having taken place immediately.  As the new tiles become available, they are drawn over top of the resized tiles.