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iPOGO V5 Help Manual On-Line |
Group: |
3) Brg-Brg Intx |
Methodology | |
| Command: | -3 |
| Alpha Alias: | -Direction Int |
| Description: | Computes points by dropping perpendiculars to a known line and computing the intersections |
| Data Format: | -3 Set From Bearing From {[From]...} ; |
| Problem: | Given point number 30 on a line bearing North 85°00'00" East, and given point numbers 25, 26 and 27. Set point numbers 31, 32 and 33. |
| Solution: | -3 31
30 -1 85 0 0
25
26
27 ; |
Data Description
| Command | -3 | Sets points by dropping perpendiculars from known points to a known line and computing the intersection points. Bearings may be entered using quadrant definition and angle, or by using point definition. |
| Set | 31 | The point number to be assigned to the first coordinate you want to compute. Any additional computed points will be numbered automatically from the Set point value. If you enter a positive value for the Set point, the computed points will be numbered in increasing order If you enter a negative value, the points will be numbered in decreasing order. |
| From | 30 | The number of a previously computed or stored point which defines the line on which the coordinate will be set. |
| Bearing | -1 85 00 00 | The direction of the line on which the point is to be computed. |
| From | 25 | Point from which you want to drop a perpendicular to the specified line and compute the intersection point. |
| {[From]...} | 26
27 | Repeating feature of this command. Enter additional points from which you want to drop perpendiculars to the specified line. |
| End Command | ; | All commands end with a semi-colon. |
Example Command File
$ Example data set for -3
$ (-DIRECTION INT) command.
$ Set initial known points.
0
25 2880.0 1841.7
26 2680.0 2858.3
27 1240.0 3400.0
30 1770.0 508.3 ;
$ Set points using the -3 command.
-3 31 30 -1 85 0 0
25
26
27 ;
$ Set additional points for drawing lines.
1 1000 33 30 33 100 ;
$ Setup plotting parameters with
$ feature, layer, color, style, thickness
15.1 L1 LINES 7 1 1;
$ Turn plot on
91;
$ Activate the current feature
15 L1 ;
$ Draw the lines.
7 1 30 1000 ;
7 2 25 31 ;
7 3 26 32 ;
7 4 27 33 ;