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extend [2018/05/01 11:04] – [Summary of all extend options, for survey centrelines] start leg edit brucemuttonextend [2018/05/03 11:13] – [Extended elevation scrap drawing considerations] brucemutton
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 ''extend hide <leg>'' - hides the centreline part of the specified leg only, but NOT its stations.  Stations that form the leg remain visible!  Does not hide subsequent stations or legs. \\ ''extend hide <leg>'' - hides the centreline part of the specified leg only, but NOT its stations.  Stations that form the leg remain visible!  Does not hide subsequent stations or legs. \\
-''extend hide <station>'' - hides the station and all leg centrelines (usually two of these) that emanate directly from THIS station.  Unlike with other extend options, it does not hide subsequent stations or legs. Note that the centreline generation is carried out as per normal, the stations and legs are just made ‘not visible’.\\+''extend hide <station>'' - hides [the stationandall leg centrelines (usually two of these) that emanate directly from THIS station.  Unlike with other extend options, it does not hide subsequent stations or legs. \\ 
 +Note that the centreline generation is carried out as per normal, the stations and legs are just made ‘not visible’.\\ 
 + 
 +//* Something I don't understand with 'hide' above, stations are sometimes hidden, and sometimes not.//
  
 ===General Tips=== ===General Tips===
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 ====Extended elevation scrap drawing considerations==== ====Extended elevation scrap drawing considerations====
-If you have drawn a scrap with the opposite orientation to the extended centreline generation, it will tend to plot inside out.  You need to compensate for this by including ''-flip horizontal'' in the definition of your scrap.  Or you can add ''-revise scrap id -flip horizontal'' in your Extend-CaveName-ElevEXT.th file **(I need to check the details of this)**.+If you have drawn a scrap with the opposite orientation to the extended centreline generation, it will tend to plot inside out.  You need to compensate for this by including ''-flip horizontal'' in the definition of your scrap.  Or you can add ''-revise scrap-id -flip horizontal'' in your Extend-CaveName-ElevEXT.th file.
  
 If you include in your scrap drawing a ''point station -name <station>'' where that <station> is at a survey leg junction AND is offset in the extended centreline due to extended loop misclosure, then it will force the extended station to plot, incorrectly, in its original location, distorting the scrap in the vicinity of that leg.  This can be vexing, as \\ If you include in your scrap drawing a ''point station -name <station>'' where that <station> is at a survey leg junction AND is offset in the extended centreline due to extended loop misclosure, then it will force the extended station to plot, incorrectly, in its original location, distorting the scrap in the vicinity of that leg.  This can be vexing, as \\
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 b) generally the station that you cannot draw is a marked station (cairn or otherwise identified station) that you are most likely to want to identify on the drawing!\\ b) generally the station that you cannot draw is a marked station (cairn or otherwise identified station) that you are most likely to want to identify on the drawing!\\
  
-Now most of the established  Therion documentation describes how to create a map-connection line between ends of loop.  However I have never done this, as it seems to be built into Therion these days.\\+Now most of the established  Therion documentation describes how to create a map-connection line between ends of loop.  However I have never done this, as it seems to be built into Therion these days, at least for centreline plots.\\
 However for completeness here is the code for a scrap to draw a connection line.  For now I will put it here as a placeholder, until we figure out if it still has a practical application. However for completeness here is the code for a scrap to draw a connection line.  For now I will put it here as a placeholder, until we figure out if it still has a practical application.
 The famous [[https://therion.speleo.sk/samples.doc/25.html|Extended elevation control sample]] The famous [[https://therion.speleo.sk/samples.doc/25.html|Extended elevation control sample]]
  • extend.txt
  • Last modified: 2 months ago
  • by brucemutton