Home FAQs Center Help Manual Development Contact Us| Legal Notices | How to Use This Manual | Message Board |
iPOGO V5 Help Manual On-Line |
Group: |
10) Rotation/Scale |
Methodology | |
| Command: | -10 |
| Alpha Alias: | Define RotScalePts |
| Description: | Computes rotation and distance factors from known points |
| Data Format: | -10 Deed-Points Field-Points ; |
| Problem: | Given field points 17 and 21 and deed points 101 and 105. Compute and retain the angle of rotation and distance factor d2/d1 as shown in the graph below. |
| Solution: | -10 101 105 17 21 ; |
Data Description
| Command | -10 | Computes an angle of rotation and distance factor from known points. Used before computing commands that reset points. Affects all following computing commands that require bearings, angles and distances.
An angle of rotation is computed between the specified deed line and the corresponding field line. The angle is measured clockwise from the deed line to the field line if the field line lies to the right. If the bearing of the field line lies to the left of the deed line, the angle is measured counter-clockwise. The difference between the two line lengths is computed as a distance multiplier. This distance factor is the quotient of the distance between the field points, divided by the distance between the deed points. The angular rotation and distance factor are applied to every distance and every bearing entered with quadrant and angle. Bearings defined by two point numbers are not affected. The -10 command may be terminated by entering a 10 command, another -10 command, or 10,0,0,0,1. Note: The deed and field points are entered in reverse order in the 18 and -18 commands. You must enter the deed points first in the -10 command. |
| Deed-Points | 101, 105 | Two point numbers of a previously calculated figure. |
| Field-Points | 17, 21 | Two point numbers of a previously computed figure that correspond to the two deed points entered. |
| End Command | ; | All commands end with a semi-colon. |
Example Command File
$ Example data set for the -10
$ (Define RotScalePts) command.
$ Set the initial points.
0 17 1620.0 508.3
18 2310.0 1225.0
19 1620.0 1825.0
20 1770.0 2691.7
21 1000.0 1783.3
22 1060.0 983.3
101 1733.5 3217.0
102 2333.5 3967.0
103 1583.5 4579.5
104 1808.5 5579.5
105 908.5 4592.0
106 1028.5 3592.0 ;
$ Calculate the rotation and distance factors
$ using -10 command.
$ FYI: This is a big scale factor!
-10 101 105 17 21 ;
$ Setup feature codes with
$ cmd feature, layer, color, style, thickness
15.1 L1 LINES1 1 1 1 ;
15.1 L3 LINES3 3 1 1 ;
15.1 L4 LINES4 4 1 1 ;
$ Turn plot on
91 ;
$ Activate the L1 feature
15 L1 ;
100 Inverse field lines;
7 1 17 18 19 20 21 22 17 ;
$ Activate the L3 feature
15 L3 ;
100 Inverse deed lines;
7 1 101 102 103 104 105 106 101 ;
$ Activate the L4 feature
15 L4 ;
100 Inverse common lines;
7 1 17 21 ;
7 1 101 105 ;