shift Layers a Fixed Distance ???

qudduq

shift Layers a Fixed Distance ???

Can be used in any function sdk?

Please sample.

cap2.PNG

global_mapper

You can use the GM_RepositionLayer function to provide a new set of control points with the shifted location. For vector data you only need 2 control points, say with input ("pixel") locations of 0,0 and 1,1 and the output (ground) locations of the shift added to that. So if you wanted to go 3 meters east and 2 meters south, the output points would be (-3,2) [note you have to negate the shift] and (-2,3). For raster layers just get the control point list from the GM_GetLayerInfo call, adjust each mGroundX and mGroundY value by the shift amount, then call GM_RepositionLayer with the new control points list.

Let me know if I can be of further assistance.

Thanks,

Mike
Global Mapper Guru
gmsupport@bluemarblegeo.com
http://www.globalmapper.com

qudduq

Thanks,

Mike One more question?

How do I use (in shp or dxf vector)

qudduq

vector case :
GM_RepositionLayer how to use ???

Please sample code

global_mapper

Try something like the following to shift a layer handle (theLayerHandle in code below) 3 units to the east and 2 units to the south:

GM_GroundControlPoint_t theGCPList[2];
memset( theGCPList, 0, sizeof theGCPList );
double theShiftX = 3.0;
double theShiftY = -2.0;
theGCPList[0].mPixelX = 0;
theGCPList[0].mPixelY = 0;
theGCPList[0].mGroundX = theGCPList[0].mPixelX - theShiftX;
theGCPList[0].mGroundY = theGCPList[0].mPixelY - theShiftY;
theGCPList[1].mPixelX = 1;
theGCPList[1].mPixelY = 1;
theGCPList[1].mGroundX = theGCPList[1].mPixelX - theShiftX;
theGCPList[1].mGroundY = theGCPList[1].mPixelY - theShiftY;
GM_RepositionLayer( theLayerHandle, theGCPList, 2, NULL );

Note I just did this off the top of my head and haven't compiled or tested it, but you should get the idea.

Let me know if I can be of further assistance.

Thanks,

Mike
Global Mapper Guru
gmsupport@bluemarblegeo.com
http://www.globalmapper.com