gnuplot-beta

gnuplot windows term issue: point size

[Sebastian P. <spc...@gm...>]

Hello

When I resize manually plot window, all points in the plotting
function become much bigger, even if I'm acctualy decreasing the size
of the window. When I'm sizing window again the points remain with
incorrect size. It can be seen in "test" window also. Is it a bug in
windows terminal?

Here is what the "effect": http://bayimg.com/BaNLhAabI

sys: Windows xp pro sp3
gnuplot: svn

Sebastian Pająk

Re: gnuplot windows term issue: point size

[Ethan M. <merritt@u.washington.edu>]

On Thursday 12 February 2009 12:33:16 Sebastian Pająk wrote:
> Hello
> 
> When I resize manually plot window, all points in the plotting
> function become much bigger, even if I'm acctualy decreasing the size
> of the window. When I'm sizing window again the points remain with
> incorrect size. It can be seen in "test" window also. Is it a bug in
> windows terminal?

The points are drawn at an arbitrary size, and you cannot expect
that size to be consistent across terminals.  Furthermore, the
size of the point itself is independent of the current size of the
canvas (I think, anyhow, it is possible that there are some terminal
types for which this is not true).

There are two alternatives which give you more control over the
scaling of the plotting symbols, allowing the size to be on some
absolute scale relative to the plot axes or to the canvas size.

4.2 or 4.3:
Use "with labels" rather than "with points", and control the size
of the symbol by changing the font size.  An extreme example is
here:
    http://skuld.bmsc.washington.edu/people/merritt/gnuplot/index.html#variable_label_size

4.3 only:
Use "plot ... with circles", which allows you to give the radius of
each circle in either axis coordinates or absolute sizes.
Demo here:
    http://gnuplot.sourceforge.net/demo_4.3/circles.html


-- 
Ethan A Merritt

Re: gnuplot windows term issue: point size

[Sebastian P. <spc...@gm...>]

I don't get it. Why point size cannot be fixed? The line weight can be
set and it is const. even when resizing window, but the size of the
point is totally ignored!? Points should be autoscaled or at least
they should keep fixed size. In Gnuplot their size is impredictable.
Another win term bug?


2009/2/12 Ethan Merritt <merritt@u.washington.edu>:
> On Thursday 12 February 2009 12:33:16 Sebastian Pająk wrote:
>> Hello
>>
>> When I resize manually plot window, all points in the plotting
>> function become much bigger, even if I'm acctualy decreasing the size
>> of the window. When I'm sizing window again the points remain with
>> incorrect size. It can be seen in "test" window also. Is it a bug in
>> windows terminal?
>
> The points are drawn at an arbitrary size, and you cannot expect
> that size to be consistent across terminals.  Furthermore, the
> size of the point itself is independent of the current size of the
> canvas (I think, anyhow, it is possible that there are some terminal
> types for which this is not true).
>
> There are two alternatives which give you more control over the
> scaling of the plotting symbols, allowing the size to be on some
> absolute scale relative to the plot axes or to the canvas size.
>
> 4.2 or 4.3:
> Use "with labels" rather than "with points", and control the size
> of the symbol by changing the font size.  An extreme example is
> here:
>    http://skuld.bmsc.washington.edu/people/merritt/gnuplot/index.html#variable_label_size
>
> 4.3 only:
> Use "plot ... with circles", which allows you to give the radius of
> each circle in either axis coordinates or absolute sizes.
> Demo here:
>    http://gnuplot.sourceforge.net/demo_4.3/circles.html
>
>
> --
> Ethan A Merritt
>

Re: gnuplot windows term issue: point size

[Ethan M. <merritt@u.washington.edu>]

On Thursday 12 February 2009 13:27:58 Sebastian Pająk wrote:
> I don't get it. Why point size cannot be fixed? The line weight can be
> set and it is const. even when resizing window, but the size of the
> point is totally ignored!? 

I do not understand what you are saying.
In fact the line weight and the point size behave identically.
Both are arbitrary (line weight in terminal A may not match line weight
in terminal B).

> Points should be autoscaled or at least they should keep fixed size. 

Some terminals do autoscale the points.
Other terminals cannot scale them and so they remain a fixed size.
This is a limitation of not all output devices having the same
properties.

> In Gnuplot their size is impredictable. 
> Another win term bug?

Not a bug.  The point symbol sizes are arbitrary for all terminals.
In many cases gnuplot has no control over the size at all.
For instance, the older pen plotter and character cell devices
simply offer some fixed number of point symbols, and gnuplot
sends the command "use the third symbol, whatever it is".

That is why I suggested to use one of the newer options that do
indeed scale in a predictable way.
 

> 2009/2/12 Ethan Merritt <merritt@u.washington.edu>:
> > On Thursday 12 February 2009 12:33:16 Sebastian Pająk wrote:
> >> Hello
> >>
> >> When I resize manually plot window, all points in the plotting
> >> function become much bigger, even if I'm acctualy decreasing the size
> >> of the window. When I'm sizing window again the points remain with
> >> incorrect size. It can be seen in "test" window also. Is it a bug in
> >> windows terminal?
> >
> > The points are drawn at an arbitrary size, and you cannot expect
> > that size to be consistent across terminals.  Furthermore, the
> > size of the point itself is independent of the current size of the
> > canvas (I think, anyhow, it is possible that there are some terminal
> > types for which this is not true).
> >
> > There are two alternatives which give you more control over the
> > scaling of the plotting symbols, allowing the size to be on some
> > absolute scale relative to the plot axes or to the canvas size.
> >
> > 4.2 or 4.3:
> > Use "with labels" rather than "with points", and control the size
> > of the symbol by changing the font size.  An extreme example is
> > here:
> >    http://skuld.bmsc.washington.edu/people/merritt/gnuplot/index.html#variable_label_size
> >
> > 4.3 only:
> > Use "plot ... with circles", which allows you to give the radius of
> > each circle in either axis coordinates or absolute sizes.
> > Demo here:
> >    http://gnuplot.sourceforge.net/demo_4.3/circles.html
> >
> >
> > --
> > Ethan A Merritt
> >
> 
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-- 
Ethan A Merritt
Biomolecular Structure Center
University of Washington, Seattle 98195-7742

Re: gnuplot windows term issue: point size

[Petr M. <mi...@ph...>]

> When I resize manually plot window, all points in the plotting
function become much bigger, even if I'm acctualy decreasing the size
of the window. When I'm sizing window again the points remain with
incorrect size. It can be seen in "test" window also. Is it a bug in
windows terminal?

Hit "e" hotkey or type "replot" to replot the window.

---
PM