iPOGO V5 Users Group - Help Manual

*Methodology*
Command:	-4.1
Alpha Alias:	-Arc DirOs
Description:	Computes the point of intersection of two or more concentric curves with a line or bearing parallel to and offset from a known line
Data Format:	-4.1 Set From Bearing Offset Radius-Point Near Radius {[Radius] ... } ;
Problem:	Given points 1, 2, 100 and 101. Set points 21, 22 and 23 as shown.
Solution:	-4.1 21 1 1 2 10 100 101 475 500 525 ;

Data Description

Command	-4.1	Defines a line or bearing parallel to a known line at a specified offset distance and computes the point of intersection of two or more concentric curves with the offset line. The defined line or bearing may intersect the curve at two points. You must indicate your required point of intersection by specifying a point number that is located nearer to the solution to be retained. Note: If you use the repeating feature of this command to compute the points of intersection with more than one arc, be sure to enter a Near point that will define all the required solutions.
Set	21	Point number of the initial point of intersection to be computed.
From	1	Point number of a previously computed point lying on the known line from which the parallel line is drawn.
Bearing	1, 2	Direction of the known line.
Offset	10	Offset distance between the known line and the parallel line on which the points of intersection are to be set. When you want the parallel line to lie to the left of the known line as directed by the specified bearing, enter the offset distance as a negative number.
RadiusPoint	100	Point number of the previously computed radius point of the concentric curves.
Near	101	Point number that is located nearer to the required solution than to the alternate solution. Note: If you use the repeating feature of this command to compute the points of intersection with more than one arc, be sure to enter a Near point that will define all the required solutions.
Radius	475	Radius length of the curve.
{[Radius] ... }	500 525	Repeating feature of this command. Enter a radius for each of the concentric curves to be intersected.
End Command	;	All commands end with a semi-colon.

Example Command File

$ Example data set for -4.1 (-Arc DirOS) command

$ Set initial points.
  0
      1 1021.5  358.4 
      2 1211.3  593.6 
    100 1000.0 1000.0 ;
  1 101 100 
            -4 85 0 0 500 ;

$ Set points using -4.1 command.
-4.1 21 1 1 2 10 
          100 101 475 
                  500 
                  525 ;

$ Set additional points for drawing lines.
 -1 1000 101 100 101 25 101 100 25 ;
  1 1002 23 21 23 200 ;
  0 
    1003 1255.6 795.8 ;
  3.1 1004 
           1    2    1 -10 
           1003 2 1003  10 ;
  1 1005 1004  2 1003 200  ;
  1 1006 1000 -3 5 0 0 100 ;
  1 1007  101 1000 1006 100;
  1 1008 1001 1000 1006 100;

$ Setup plotting parameters with 
$   feature, layer, color, style, thickness
  15.1 L1 LINES1 7 1 1;

$ Turn plot on
  91 ;

$ Activate the current feature
  15 L1 ;
          $ Draw the lines.
            7 1 1 2 1003 ;
            7 1 1002 1004 1005 ;
            6 1 100  1001 ;
            7 1 1006 1000 100.1 23 ;
            7 1 1007  101 100.1 22 ;
            7 1 1008 1001 100.1 21 ;

Help for this command was last updated: 06/27/2000 11:32:22 PM

iPOGO V5 Help Manual On-Line

Group:Command:

4) Brg-Dist Intx-4.1 or -Arc DirOs

Group:
Command:

4) Brg-Dist Intx
-4.1 or -Arc DirOs