Re: Filling polygons using GTK-Extra.

Oi Fabio! This is what I would do:

1) Take a look at gtkplotbox.[ch] copy it into a new file gtkplotpoly.[ch].
2) Replace all the Box->Poly ; plot_box -> plot_poly
3) go to gtk_plot_poly_draw_symbol, and replace all the code for dawing 
your custom polygon. Example:

 GtkPlotPoint point[n];

 point[0].x = ...;
 point[0].y = ...;
....
 point[n-1].x = ...;
 point[n-1].y = ...;

 gtk_plot_pc_draw_polygon(plot->pc, TRUE,point, n);

and voila! compile together with your code.
BTW. to convert from actual (x,y) coordinates to GtkPlotPoint (pixel) 
coordinates, you should use:
 
gtk_plot_get_pixel(plot, x, y, &point.x, &point.y);

Good luck!,
Saludos,
<ADRIAN>


Fabio da Silva wrote

Hola, Adrian!

>
> I have an integrated circuit design that I will need to tweak to reach 
> its final version.
> The design has 25 parameters that I need to be able to change before I 
> generate the
> final CAD script. I have been doing this on a command line basis but 
> now I wanted
> to see the changes on a GUI before I submit the script file and not 
> launch the CAD
> program everytime I change a parameter.
>
> That's why I need to be able to draw polygons with some filling 
> capabilities. This is
> a simple drwaing capability I want to implement. Eventually, the GUI 
> will have a
> simulation capability that will use the ploting capabilities of 
> GTK-Extra.
>
> I have successfully integrated Glade and GTK-Extra in some other 
> ploting GUIs
> I built, but the polygon drawing is new to me now.
>
> Any suggestion will be of great help.
>
>    Muito obrigado!
>
>        Fabio.
>
> Adrian E. Feiguin wrote:
>
>> Can you tell me exactly what's the idea behind the polygons? What are 
>> you representing? You need different shapes for different points? Can 
>> you use a pixmap? You are plotting some data or you just want to draw 
>> shapes? Tell me more and I'll give you a couple of ideas.
>> Saludos.
>> <ADRIAN>
>>
>> Fabio da Silva wrote:
>>
>>> Hello again!
>>>
>>> I need to draw some figures in my application that will require the 
>>> creation and
>>> display of polygons on the screen. On the gtkplotdata.h file I found 
>>> a few basic
>>> shapes like, lines, rectangles and ellipses. Is there a similar 
>>> function for general
>>> polygons?
>>>
>>> I tried to fill the region defined by a set of points using 
>>> gtk_plot_data_fill_area, but
>>> the filling is done with respect to the x-axis... I also looked at 
>>> the gtkplotpc.h file,
>>> but I am not sure whether or not I could use those functions into a 
>>> canvas widget.
>>> I checked the CVS repository, but  couldn't find a testgtkplotpc.c 
>>> file for some
>>> enlightening hints either. I can try it if that's the answer, but I 
>>> want to check with
>>> you guys first.
>>>
>>> Any suggestion?
>>>
>>>    Thank you,
>>>
>>>        Fabio.
>>>
>>>
>>>
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>>
>>
>>
>
>
>
> .
>



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