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

["praveen manja" <praveen_manja rediffmail com>]

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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