====== 3.2.1- HOW TO EXTEND CENTERLINE ======


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 right, 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