Hatching profiles and extended elevations
Hello cavers, at least in Germany it is/was usual to add hatching to extended elevations and profiles (cross sections) like in the following example: I guess it will be difficult to do this in Therion because the hatching is outside of the passage and will be clipped but anyway: Is there a way to achieve this? Is it possible to add an arrow to lines of type section indicating the viewing direction like in this example: Thank you! Best regards, Roger
Hello, for the hatches: maybe you could do a custom area symbol and use it with "clip off" option. I don't know if this is supported, but it might work. You could try it with some other area first... And the section arrows are easy by a line option (see thbook p. 29): "direction <begin/end/both/none/point> ▷ can be used only with the section type. It indicates where to put a direction arrow on the section line. None is default." Am 2020-04-18 22:06, schrieb Roger Schuster:
Hello cavers,
at least in Germany it is/was usual to add hatching to extended elevations and profiles (cross sections) like in the following example:
I guess it will be difficult to do this in Therion because the hatching is outside of the passage and will be clipped but anyway: Is there a way to achieve this?
Is it possible to add an arrow to lines of type section indicating the viewing direction like in this example:
Thank you!
Best regards,
Roger _______________________________________________ Therion mailing list Therion@speleo.sk https://mailman.speleo.sk/listinfo/therion
for the hatches: maybe you could do a custom area symbol and use it with "clip off" option. I don't know if this is supported, but it might work. You could try it with some other area first...
Another option is to make the wall:bedrock line have rays pointing at an angle (using a strict angle, not the angle of the line) but cutafter the line itself. But I think this might be extremely tricky to implement, and I can't think of an an easy way right now. The issue would be tight corners, where it is simply not possible to do all the clipping correctly. You could though define an area between the wall line itself, and a path that you calculate (using sharp corner avoidance) outside the wall line: https://therion.speleo.sk/wiki/metapost#shuttering_two_parallel_lines Then fill that area using a hatching pattern. That could actually work, and not be totally insane. However, your issue would be when you change from one line to another - at that point, the fill areas might not match up perfectly, and you might get unhatched gaps. It would only work for lines that you have redefined to have that cool fill pattern. Maybe someone will feel inspired to make a proof of concept...
Hi all, thank you for your answer. The problem with the direction arrow at section lines is solved. I had missed the explanation in the Therion book because I always just checked the documentation in foot note 27. Last night I had the idea to solve the problem with hatching using an area. If I draw one invisible border (with -clip off) around the profile and use this as area (type water for example, with -clip off) the pattern also fills the inner part of the profile which I don't like to have. Next I tried to draw a second invisible border just outside of the profile and applied the area to the "gap" between the inner and outer border but this results in really weird patterns. I guess it's because the inner border behaves like a pillar. Of course I played around with different orientations of the borders. It never works as expected. Best regards, Roger Am 19.04.2020 um 00:38 schrieb Benedikt Hallinger:
Hello, for the hatches: maybe you could do a custom area symbol and use it with "clip off" option. I don't know if this is supported, but it might work. You could try it with some other area first...
And the section arrows are easy by a line option (see thbook p. 29): "direction <begin/end/both/none/point> ▷ can be used only with the section type. It indicates where to put a direction arrow on the section line. None is default."
Am 2020-04-18 22:06, schrieb Roger Schuster:
Hello cavers,
at least in Germany it is/was usual to add hatching to extended elevations and profiles (cross sections) like in the following example:
I guess it will be difficult to do this in Therion because the hatching is outside of the passage and will be clipped but anyway: Is there a way to achieve this?
Is it possible to add an arrow to lines of type section indicating the viewing direction like in this example:
Thank you!
Best regards,
Roger _______________________________________________ Therion mailing list Therion@speleo.sk https://mailman.speleo.sk/listinfo/therion
it works like a charm here. Attached screenshot and example data (rabbit cave). caveats: - be sure to add "-clip off" option to the area (see screenshot!) - you can even use the wall as second line, so the it clips perfectly there. Am 2020-04-19 13:46, schrieb Roger Schuster:
Hi all,
thank you for your answer. The problem with the direction arrow at section lines is solved. I had missed the explanation in the Therion book because I always just checked the documentation in foot note 27.
Last night I had the idea to solve the problem with hatching using an area. If I draw one invisible border (with -clip off) around the profile and use this as area (type water for example, with -clip off) the pattern also fills the inner part of the profile which I don't like to have. Next I tried to draw a second invisible border just outside of the profile and applied the area to the "gap" between the inner and outer border but this results in really weird patterns. I guess it's because the inner border behaves like a pillar. Of course I played around with different orientations of the borders. It never works as expected.
Best regards,
Roger
Am 19.04.2020 um 00:38 schrieb Benedikt Hallinger:
Hello, for the hatches: maybe you could do a custom area symbol and use it with "clip off" option. I don't know if this is supported, but it might work. You could try it with some other area first...
And the section arrows are easy by a line option (see thbook p. 29): "direction <begin/end/both/none/point> ▷ can be used only with the section type. It indicates where to put a direction arrow on the section line. None is default."
Am 2020-04-18 22:06, schrieb Roger Schuster:
Hello cavers,
at least in Germany it is/was usual to add hatching to extended elevations and profiles (cross sections) like in the following example:
I guess it will be difficult to do this in Therion because the hatching is outside of the passage and will be clipped but anyway: Is there a way to achieve this?
Is it possible to add an arrow to lines of type section indicating the viewing direction like in this example:
Thank you!
Best regards,
Roger _______________________________________________ Therion mailing list Therion@speleo.sk https://mailman.speleo.sk/listinfo/therion
Therion mailing list Therion@speleo.sk https://mailman.speleo.sk/listinfo/therion
19. 4. 2020 v 13:46, Roger Schuster <roger@r-schuster.de>:
Hi all,
thank you for your answer. The problem with the direction arrow at section lines is solved. I had missed the explanation in the Therion book because I always just checked the documentation in foot note 27.
Last night I had the idea to solve the problem with hatching using an area. If I draw one invisible border (with -clip off) around the profile and use this as area (type water for example, with -clip off) the pattern also fills the inner part of the profile which I don't like to have. Next I tried to draw a second invisible border just outside of the profile and applied the area to the "gap" between the inner and outer border but this results in really weird patterns. I guess it's because the inner border behaves like a pillar. Of course I played around with different orientations of the borders. It never works as expected.
Check attached images. The trick is, the real scrap (section in this case) is filled by a colour white in this case). So the upper scrap clip the underlying background scrap. And I use wall:invisible as border for background scrap. I apologize myself, but it is 7 years now. Martin hatch.thconfig: layout hatch code metapost beginpattern(pattern_hatch); draw origin--10up withpen pensquare scaled (0.02u); patternxstep(.18u); patterntransform(identity rotated 125); endpattern; def a_u_hatch (expr Path) = T:=identity; thclean Path; thfill Path withpattern pattern_hatch; enddef; def a_u_white (expr p) = T:=identity; thfill p withcolor (1, 1, 1); enddef; endlayout
18. 4. 2020 v 22:06, Roger Schuster <roger@r-schuster.de>:
I guess it will be difficult to do this in Therion because the hatching is outside of the passage and will be clipped but anyway: Is there a way to achieve this?
Simply add (custom) area like default water under your drawing (bottom of stack of commands in a particular scrap) with border invisible and "-clip off“ parameter. You may add any kind of area in such way (colorized, …) Martin
participants (4)
-
Benedikt Hallinger -
Martin Sluka -
Roger Schuster -
Tarquin Wilton-Jones