Re: Are there any easy methods to draw and update piechart than this?

[Maurizio Umberto Puxeddu <mauriziopuxeddu yahoo it>]

I don't use canvases so don't know exactly but the gdk primitive to draw
arcs has begin and end angles parameters

Also I think there is a set of advanced widgets of that kind of things:

gtkextra.sf.net

HTH,

Maurizio Umberto Puxeddu.

On Wed, 2003-05-21 at 14:39, praveen manja wrote:
> Hi Gnomites,
> 
> Please let me know if there are there any easy methods to draw and 
> update piechart than this.
> 
> 
>   I am developing a cluster management tool along with dynamic 
> resource monitoring component.
>   In GUI I have developed dynamically updated piecharts and 
> barcharts to show sys-resources.(as you can see process bars in 
> GTOP) .
> 
>   I didn't use GnomeCanvasEllipse to draw the piechart, as the 
> whole ellipse has to be filled by a single color. But I need 
> different colors to be filled amongst the units of the piechart.
>    (Eg. In a piechart showing meminfo, I need green for Memfree 
> and orange for Mem used.)
> 
>   Hence I was forced to use 360 isosceles triangles with :
> 
>               length of a, b (of equal sides) =  radius,
>               length of c     =     1 unit (converted to canvas 
> unit)
>               angle = 1 deg (converted to radian)
> 
>    Using the above info I iterated a loop to draw  360 
> polygons(triangle)
> and later I updated the polygon points using
> 
>    gtk_timeout_add()
> 
> and
> 
>    gnome_canvas_item_set()           in my  callback to set the 
> new color of the already created triangle .
> 
>      It is workin fine.
> 
> Please let me know if there are there any easy methods to draw and 
> update piechart than this.
> 
> 
> Thanks,
> 
> Praveen S Manja.
> 
> 
> 
> 
> 
> 
> 
> 
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