leIsLayerVisible

leIsLayerVisible( 
l_layerPurposePair
[ d_techFileId ]
) 
=> t / nil

Checks whether the layer specified by l_layerPurposePair is visible. If d_techFileId is not specified, the current technology file is used.

l_layerPurposePair	Layer-purpose pair checked for visibility.
d_techFileId	The database ID of the technology file containing the layer-purpose pair checked for visibility.

`t`	The layer l_layerPurposePair is visible.
`nil`	The layer l_layerPurposePair is not visible.

Returns t if layer1 is a visible layer.

leIsLayerVisible( list("layer1" "drawing") )