[Mapbuilder-devel] fixed zoom levels in mapcontainerbase and extent

[Steven M. O. <ste...@ge...>]

Hi all,

For tiling I need fixed zoomLevels. At first I wanted to calculate those
in TileExtent.js but then I realised that I will have a problem when
adding other layers. So I propose to include the fixed zoom levels in
mapcontainerbase and extent.

In MapContainerBase.js an extra config-parameter check is included to
see if <zoomLevels> are defined. Then it enables fixed scale in extent by:
if (this.zoomLevels)
this.containerModel.extent.setFixedScale(true,this.zoomLevels);

In extent two function are added: setFixedScale (access point for
MapContainerBase) and getFixedScale(res) The latter one calculates the
closest greater fixed scale.
In the centerAt function a check for zoomLevels is included to change
res if needed:
if (this.zoomLevels) {
      newres=this.getFixedScale(newres);
    }

If there are no objections I commit the code, so people can have a look
and enhance it. (a problem is that the initial extent is not adepted to
zoomLevels ATM)

Steven

-- 
Geodan S&R Amsterdam

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