Re: GTK3 + gnuplot

[<cecashon aol com>]

 Hi Arkkimede,

With gnuplot you can output to a file and then open the file with GTK+.

https://gitlab.com/cecashon/OrderedSetVelociRaptor/blob/master/Misc/Pipes/gnuplot5.c

At one time gnuplot could directly write to GTK but that was a possible security problem so it no longer 
works to do this.

Gnuplot has 3d graphing plots and I think that it does this with cairo. You can graph in 3d with cairo but 
you need to do a few extra calculations before drawing with cairo. The Graphene library has a number of 
functions that are very helpful for drawing in 3d. It is part of GTK4 but you can use it in GTK3.

https://developer.gnome.org/graphene/stable/ch01.html

Another option is to write your own helper functions for drawing with cairo in 3d.

https://gitlab.com/cecashon/OrderedSetVelociRaptor/blob/master/Misc/cairo_drawings/perspective3.c
https://gitlab.com/cecashon/OrderedSetVelociRaptor/blob/master/Misc/cairo_drawings/perspective4.c
https://gitlab.com/cecashon/OrderedSetVelociRaptor/blob/master/Misc/cairo_drawings/shadow1.c
https://gitlab.com/cecashon/OrderedSetVelociRaptor/blob/master/Misc/cairo_drawings/shadow2.c
https://gitlab.com/cecashon/OrderedSetVelociRaptor/blob/master/Misc/cairo_drawings/spring2.c

So options abound for putting together a 3d plotting widget in GTK.

Eric
 
 
-----Original Message-----
From: arkkimede via gtk-app-devel-list <gtk-app-devel-list gnome org>
To: gtk-app-devel-list list <gtk-app-devel-list gnome org>
Sent: Tue, Sep 18, 2018 9:20 am
Subject: GTK3 + gnuplot

Hi!
I've developed an application in c to make measurements, with a GUI that
manage the inputs and it is able to produce graphical results in terms of
2d plots, realized by mean of the library Cairo.

Now I have the necessity to produce 3d plots (3d radiation pattern of
antennas).

To realize 3d plots by mean of a 2d library, is not impossible but very
hard.
A solution could be using gnuplot that I'he yet used to produce high
quality 3d plots.

The question now is: "How to embed a gnuplot graphic in gtk3?
Could you say, please, where to find a simple example, just to undestand
how it is possible to do that?

Thank you
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