iPOGO V5 Users Group - Help Manual

*Methodology*
Command:	-11.1
Alpha Alias:	Os Pline
Description:	Computes angle points of tangents parallel to and at a fixed offset distance from a series of known tangents
Data Format:	-11.1 Set From Offset PI-Ahead {[PI-Ahead] ... } ;
Problem:	Given points numbered 1 through 6, set points 21 through 26 as shown.
Solution:	-11.1 21 1 25 2 3 4 5 6 ;

Data Description

Command	-11.1	Sets tangents parallel to and offset from a series of known tangents. Sets the parallel tangents at a fixed offset distance from the known tangents. Computes the angle points of the parallel tangents. The initial point of the first parallel tangent will lie on a line normal to the first known tangent at its initial point. The final point computed with the -11.1 command will lie on a line normal to the last known tangent at its final point.
Set	21	Point number to be assigned to the initial point computed. All subsequent point numbers are automatically assigned from this point number.
From	1	Point number of a previously computed point that lies at the beginning of the first known tangent. The tangent is directed from this point towards the first known Point of Intersection (PI).
Offset	25	Distance between the known tangents and the parallel tangents. Enter this distance as a negative value if you want the parallel tangent to be set to the left of the known tangent, as directed towards the PI ahead. Warning!!! In the previous versions of iPOGO, there was a variation for entering 0 offsets to have the new end courses intersected with the existing lines. This variation has been removed due to the unequal number of variables in the command structure. In this and future versions, you will receive one of two error messages if you enter a 0 offset. The first error message may be 'invalid offset' and the second message may be 'invalid point', depending on which data item is set to 0. To compute these endpoints, please use an intersection command like 3 or modify this command to the 11.1 syntax with offsets noted for each tangent. Also see the FAQs concerning the changes that have occurred in the iPOGO language.
PI-Ahead	2	Point number of previously computed point at the end of each known tangent to be defined.
{[PI-Ahead] ... }	3 4 5 6	Repeating feature of the command. Point numbers of previously computed points at the end of each known tangent to be defined.
End Command	;	All commands end with a semi-colon.

Example Command File

$ Example data set for the -11.1 (Os Pline) command

$ Set the initial points.
  0 1 1000 1000 ;
  1 2 1 
        -1 60 0 0 60 
        -2 85 0 0 60 
        -1 20 0 0 15 
        -2 85 0 0 60 
        -2 45 0 0 60 ;

$ Set points for offset line by 
$   using the -11.1 command.
-11.1 21 1 25 2 
              3 
              4 
              5 
              6 ;


$ Setup feature codes with 
$  cmd  feature, layer, color, style, thickness
  15.1     RW     RW     1      1       1 ;
  15.1     CL     CL     3      1       1 ;

$ Turn plot on
  91 ;

$ Activate the RW feature
  15 CL ;
     100 Centerline;
         7 1 1 -6 ;

$ Activate the RW feature
  15 RW ;
     100 Right of way;
         7 1 21 -26 ;

Help for this command was last updated: 06/27/2000 11:36:59 PM

iPOGO V5 Help Manual On-Line

Group:Command:

11) RW Alignments-11.1 or Os Pline

Group:
Command:

11) RW Alignments
-11.1 or Os Pline