Map object
**********
Basic class of OpenLayers is the `OpenLayers.Map
<http://dev.openlayers.org/releases/OpenLayers-2.9.1/doc/apidocs/files/OpenLayers/Map-js.html>`_. It is the main view at your map application.

It has one mandatory parameter - div id, where the map is to be rendered.

Have a look in the documentation, how to `initialize the map <http://dev.openlayers.org/releases/OpenLayers-2.9.1/doc/apidocs/files/OpenLayers/Map-js.html#OpenLayers.Map.OpenLayers.Map>`_.

Several `methods
<http://dev.openlayers.org/releases/OpenLayers-2.9.1/doc/apidocs/files/OpenLayers/Map-js.html#OpenLayers.Map.Functions>`_
are available, among others:

    **addLayer** (OpenLayers.Layer) -- add layer to the map

    **setLayerIndex** (OpenLayers.Layer, Integer) -- set index of the layer in
        layer stack
    **addControl** (OpenLayers.Control) && addControls([OpenLayers.Control]) --
        add control feature to the map (layerswitcher, scalebar, overview
        map, ...)
    **addPopup** (OpenLayers.Popup) -- add popup to the map

    **setCenter** (OpenLayers.LonLat, Integer, ...) -- set new center of the
        map
    **getExtent** () -- returns OpenLayers.Bounds -- current map extent

    **getResolution, getUnits, getScale,...** -- self explaining

    **getZoomForExtent** (OpenLayers.Bounds) -- get zoom level for given
        extent

    **getResolutionForZoom** (Integer) -- get resolution for given zoom level

    **getZoomForResolution** (Float) -- get zoom for given resolution

    **zoomTo, zoomIn, zoomOut, zoomToExtent, zoomToMaxExtent, zoomToScale, ...**

    **getLonLatFromPixel, getPixelFromLonLat, ...**

And several `attributes
<http://dev.openlayers.org/releases/OpenLayers-2.9.1/doc/apidocs/files/OpenLayers/Map-js.html#OpenLayers.Map.Properties>`_:

    **layers** -- list of layers

    **scales, resolutions,...**

    **projection, units, ...**

You will probably need most of selected attributes and methods, and
possibly several others.

Example of creating map object the easiest way:

.. code-block:: javascript

    var map = new OpenLayers.Map("map1");

Example of creating map object in more complicated way:

.. code-block:: javascript

    var map = new OpenLayers.Map("map", {
            scales: [2000000,1000000,500000,200000,100000,50000,20000,10000,5000],
            units: "m",
            projection: "epsg:102067",
            maxExtent: new OpenLayers.Bounds(-905000,-1230000,-400000,-900000)
        });