Command
QisLib_SetVertexInfoRadius

QisLib_SetVertexInfoRadius

Function:
	int QisLib_SetVertexInfoRadius(int RadiusInPix);

Inputs:
	RadiusInPix: Number of pixels around the specified vertex to search for data. ( >=0 )

Return:
	0 (always)

Errors: -

Description:
	- Sets the number of screen pixels around a specified vertex to be treated as search
	area for vector data.
	- Default is 4 pixels.
	- This affects the output returned by the QisLib_GetVertexInfo call.
	- If RadiusInPix is 0, only data lying on the searching point is outputted.