[Therion] Embedding cross-sections based on bitmaps

[Bill Gee]

The big problem here is scaling the cross section so it matches the scale of 
the rest of your map.  The only way to deal with that is to draw them as 
scraps in the map editor.

If you don't care about the scale, then it is easy to treat them as images.   
Page 51 in the Therion Book.  Use the "map-image" command in the layout 
section.

===========
layout mainmap

  <......>
  map-image 17 35 center DSC0001.JPG
  map-image 38 39 center DSC0002.JPG
  <.....>

endlayout
===========

Besides the scaling of the cross-sections themselves, there is another problem 
with this method.  If the overall scale of the map changes, then the position 
of the images will no longer be where you want them to go.  The two numbers in 
the map-image command are percentages.  They start at the lower-left corner of 
the map (0 0) and go to the upper-right corner (100 100).  "Center" refers to 
the center of the image.  

In my example the first image is at x=17% and y=35% relative to the overall 
map.  Rotating the map or changing its scale (or indeed ANY change that affects 
the size of the map) will make the images go somewhere else.

Yet another problem - How big are the images?  How much border is there around 
them?  If they have a lot of border, then you will not be able to get them 
close to the cave passage where they go.  The image and its border will be on 
top and will overlay the main map.

It's a great deal of work, but I think the only way to really deal with it is 
to build scraps of all the cross sections.  Cropping your image files and 
setting their positions is also a great deal of work.

If all of your cross-section images are individual files (one cross section per 
file), then I suggest you use some sort of image editor (InkScape?  GIMP?  
Xara?) to build a single image file that contains 10 or 20 of them.  Then use 
that as the background image when building the scraps.  

Bill Gee



On Wednesday, January 28, 2015 16:38:31 Michael Wasmund wrote:
> Hello,
> I'm familiar with the method of embedding cross-sections made using scrap
> editor. That works.
> For our 10km - cave, we have 100's of cross-sections scanned from paper
> (i.e., bitmaps), drawn decades ago.
> How can I embed those? The method used for scanned paper surveys seems not
> to work.
> Whatever parameters I use, the cross-section scrap remains invisible.
> (Pls don't tell me we have to re-draw all the cross-sections)
> 
> Regards,
> Michael.
> 
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