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Back side of surfaces - linestyle

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  Back side of surfaces - linestyle macko <macko@nospam.org> - 2011-06-21 16:23 +0200
    Re: Back side of surfaces - linestyle sfeam <sfeam@users.sourceforge.net> - 2011-06-21 09:53 -0700
      Re: Back side of surfaces - linestyle macko <macko@nospam.org> - 2011-06-21 22:22 +0200
    Re: Back side of surfaces - linestyle Hans-Bernhard Bröker <HBBroeker@t-online.de> - 2011-06-21 22:57 +0200
    Re: Back side of surfaces - linestyle sfeam <sfeam@users.sourceforge.net> - 2011-06-21 23:17 -0700

#392 — Back side of surfaces - linestyle

Using v4.4.3, I am trying to control colors of two sides of a surface... 
but I can only set one color. Here is an example:

---
set terminal pdf size 6,5 enhanced

set style line 1 lc rgbcolor "blue"
set style line 2 lc rgbcolor "black"
set style line 3 lc rgbcolor "red"

set hidden3d offset 1
show hidden3d #says "Back side of surfaces has linestyle offset of 1"

splot sin(x*y) w l linestyle 1
---

The "linestyle 1" part selects a color of *both* sides; the "offset 1" 
does not seem to work. What am I missing?


Thanks,

Maciej

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#393

macko wrote:

> 
> Using v4.4.3, I am trying to control colors of two sides of a surface...
> but I can only set one color. Here is an example:
> 
> ---
> set terminal pdf size 6,5 enhanced
> 
> set style line 1 lc rgbcolor "blue"
> set style line 2 lc rgbcolor "black"
> set style line 3 lc rgbcolor "red"
> 
> set hidden3d offset 1
> show hidden3d #says "Back side of surfaces has linestyle offset of 1"
> 
> splot sin(x*y) w l linestyle 1
> ---
> 
> The "linestyle 1" part selects a color of *both* sides; the "offset 1"
> does not seem to work. What am I missing?

I think you want "offset 0".
In other words, "increment the color by 0 before drawing to other side".


> 
> Thanks,
> 
> Maciej

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#394

>> The "linestyle 1" part selects a color of *both* sides; the "offset 1"
>> does not seem to work. What am I missing?
>
> I think you want "offset 0".
> In other words, "increment the color by 0 before drawing to other side".

I would like to set two different colors. Instead of the default red and 
green, I'd like to set my colors - one color for one side (black), and a 
different color for the other side (gray).


Maciej

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#395

On 21.06.2011 16:23, macko wrote:
> set hidden3d offset 1
> show hidden3d #says "Back side of surfaces has linestyle offset of 1"

That text may well be misleading.  What you really get, from the 
commands you showed, is a line_type_ offset, not one of line_style_.

You'll have to use 'set style increment user' and keep your fingers 
crossed that somebody actually implemented that for hidden3d's offset.

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#396

macko wrote:

> 
> Using v4.4.3, I am trying to control colors of two sides of a surface...
> but I can only set one color. Here is an example:
> 
> ---
> set terminal pdf size 6,5 enhanced
> 
> set style line 1 lc rgbcolor "blue"
> set style line 2 lc rgbcolor "black"
> set style line 3 lc rgbcolor "red"
> 
> set hidden3d offset 1
> show hidden3d #says "Back side of surfaces has linestyle offset of 1"
> 
> splot sin(x*y) w l linestyle 1
> ---
> 
> The "linestyle 1" part selects a color of *both* sides; the "offset 1"
> does not seem to work. What am I missing?

Aha. I understand now.

The answer for version 4.4 is to add the command
    set style increment user

This will cause the program to step through line _styles_ rather
than line _types_.

This command is obscure, non-obvious, etc, etc, and is not needed in
version 4.5, where you can use the more obvious commands:
   set linetype 1 lc rgbcolor "blue"
   set linetype 2 lc rgbcolor "black"

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