Measuring along only the positive value of the direction

[solid7]

I'm trying to use distancedir to measure along a direction. No problem, it works fine. Except what I really want to do, is invert the direction in the next iteration, and get the measure of all of a certain feature in the other direction.

For me, a direction should dictate only positive values. (or give the option to return absolute) However, all values are absolute. Here is my intention:

		If angle( direction( ioLine ) , direction( ioTestLine ) ) == 0deg OR
			angle( direction( ioLine ) , direction( ioTestLine ) ) == 180deg
		{
			ioMeasDirLine = lineangle( ioTestLine , ioPlane , ioCoG , False , 0in , 1in , 90deg , True )
			ioMeasDir = direction( ioMeasDirLine )
			ioMeasDir1 = distancedir( ioTestLine , ioLine , ioMeasDir )
			
			set ioMeasDirLine = invert( ioMeasDirLine )
			ioMeasDir = direction( ioMeasDirLine )
			ioMeasDir2 = distancedir( ioTestLine , ioLine , ioMeasDir )
			
			ioMeasList1 ->Append( ioMeasDir1 )
			ioMeasList2 ->Append( ioMeasDir2 )
			
			Message( "ioMeasDir1 = # : ioMeasDir2 = #" , ioMeasDir1 , ioMeasDir2 )
		}

The only way that I have found to circumvent this problem, is to offset parallel lines in both directions, and measure backwards, then offset, test, and reverse offset, if not correct the 1st time. That's a pain. Too many calculations.

Anybody got a more clever way to accomplish this?

Thank you.