c#-mapscript, Rasterlayer in Map?

[Christian Wilmes]

Hi All,

ist there any possibility to find out, if a Rasterlayer is in the Extent of a Map. There is just one Layer in my Map and I want to know if the map will be blank or the Layer is visible. A possibility is to test each pixel if it is transparent or not, but that is not very effectiv. I thought about first drawing a map with just one 1x1 Pixel, but if the Extent of the Layer is much smaller than the extent of the map the result will be a transparent pixel even the Layer is in the extent of the map.

I tried out the method layerObj.isVisible(), but it doesn't have a look on the extent of the map.

Is there any possibility to find out if a Layer is really visible or just getting the extent of the raster-layer in the Reference-System of the map?

Best Regards
Christian

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