Breaking lines and polylines when descriptions change
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Some formats assign descriptions which change when a new segment of data starts. In effect this means that lines or polylines can be split up into separate entities.
Here is an example:
15 -1284.06 -199.00 90.486553 BSD
16 -1309.21 -119.04 89.731960 BSD
17 -1334.72 -118.63 89.459650 BSD
25 -1139.12 -140.98 92.766737 CZX
26 -1164.31 -140.22 92.202432 CZX
27 -1189.61 -139.96 91.733272 CZX
28 -1214.68 -139.40 91.241146 CZX
29 -1239.68 -138.93 90.634191 CZX
44 -1187.11 -299.15 92.848758 POY
45 -1212.57 -300.64 92.313981 POY
46 -1237.72 -259.27 91.838259 POY
You can see that the description column (the 4th column in this example) collects data into three different sets (BSD,CZX and POY, whatever they mean) and this can be shown as three different polylines in the DXF file. Graphically you can see the different polylines here:
Obviously if all the descriptions are different or change often this option may not do what is expected.
Anyway, in order to setup the program to break up the points into different polylines according to description the first thing you must do is set the following checkbox (when you first open the pointlist file):
The next thing you must do is click on the Dxf Options button in the dialog above and choose "Polylines With Breaks" or "Lines With Breaks":
This technique will work with any input format which contains a description field, for example PNEZD, XY Desc, etc.
If you are using the .BRK format then click here.