cdm/src/main/java/ucar/nc2/ft2/simpgeometry/CFLine.java
public void setPrev(Line prev) {
		if(prev instanceof CFLine)
		{
			setPrev((CFLine) prev);
		}
		
		else this.prev = prev;
	}
public void setPrev(Line prev) {
		if(prev instanceof CFLine)
		{
			setPrev((CFLine) prev);
		}
		
		else this.prev = prev;
	}
Sets the previous line which makes up the multiline which this line is a part of.
If prev is a CFLine, automatically connect the other line to this line as well.