From 0.3.7, Therion by default will extend all points to the right. To change this, you can edit your centerline data to add some “extend”.
You can add “-extend left” to centerline line (in your .th file). All points will extend to left now.
If you need to extend some stations to rigth, write “extend right” before the first one. After the last one, write “extend left”. Done.
Yes, it’s so simple. If you are not a native english speaker, and -like me- always wonder wether to write “right” or “rigth” you can use “normal” and “reverse” instead.
In this example we will extend stations to the left, but stations from 34 to 40 need to be extended to right. Further, we have two short shots corresponding to little prolongation of the passage that we don’t want to be in the xvi image. It would look like this:
survey irurixo -title "Irurixo Koba"
centerline -extend left # <<== MAIN CHANGE. ALL POINTS WILL EXTEND TO LEFT NOW
date 2005.02.26
declination -3 degrees
team "Mac Theknife"
team "Juxe Euskalduna" # add as many team lines as you need
units compass grad
data normal from to length compass clino left right up down
fix 0 575628 4476124 1250
fix 42 575100 4476655 1310
0 1 16.25 345 -10 1.00 0.85 6 1.60
1 2 4.10 275 1 0.30 0.90 2 1.60
(more survey data)
31 32 2.80 50.00 29.00 0.40 0.50 0.40 0.40
32 33 4.40 116.00 3.00 3.00 6.00 1.40 0.80
extend right
34 35 8.50 20.00 -5.00 1.00 2.00 1.25 0.25
35 36 3.70 45.00 4.00 0.80 2.00 0.25 0.25
36 37 3.60 51.00 13.00 0.25 0.25 0.25 0.15
37 38 2.00 41.00 16.00 0.00 2.50 2.00 0.20
38 39 4.60 115.00 20.00 1.50 1.00 2.00 1.00
39 40 4.00 393.00 -32.00 1.20 2.00 1.00 0.80
40 2 3.80 133.00 15.00 0.30 0.50 1.20 0.80
extend ignore
41 10 3.10 159.00 6.00 1.00 2.50 1.20 0.80
11 42 4.00 137.00 0.00 0.20 0.80 2.50 1.00
endcenterline
endsurvey