Re: How to most efficiently add points to a dataset?

Hi Al,
 Look at the "update" function in testrealtime.c, that's a more 
efficient way to do it. Let me know if you find any mem. leaks. Good 
luck with that. Saludos,
<ADRIAN>

Al Hooton wrote:

>On Sun, 2004-11-28 at 21:18 -0800, Al Hooton wrote:
>  
>
>>	All,
>>
>>	I have a situation where I need to start out putting a dataset in a
>>plot that has a single point, then add a subsequent point every several
>>seconds.  Each point is calculated so it is only one pixel to the left
>>    
>>
>
>
>Sorry for the second post, the "left" above should "right".  I'm growing
>this plot of points from left to right.
>
>
>  
>
>>of the point before it.  There are no connectors, just an ever-growing
>>dataset of points.
>>
>>	Currently, I do this as such:
>>
>>INIT:
>>canvas = gtk_plot_canvas_new(....)
>>plot = gtk_plot_new_with_size(.....)
>>plotChild = gtk_plot_canvas_plot_new(plot)
>>gtk_plot_canvas_put_child(canvas, plotChild, ......)
>>dataset = gtk_plot_data_new(...)
>>gtk_plot_add_data(plot, dataset)
>>gtk_plot_data_set_points(dataset, X, Y, D, ......)
>>
>>(Above, there is only a single point in X, Y and D)
>>
>>
>>EACH TIME I NEED TO ADD A POINT, EVERY FEW SECONDS:
>>gtk_plot_remove_data(plot, dataset)
>>dataset = gtk_plot_data_new(...)
>>gtk_plot_add_data(plot, dataset)
>>gtk_plot_data_set_points(dataset, X, Y, D, ......)
>>
>>Above, X, Y, and D grow by one point each time
>>
>>--------------
>>
>>This works, for a while, but after I get 50 to 100 points in the
>>datasets, it starts getting very slow.  At a certain point, the UI
>>process in my app (which is running this code) starts consuming all the
>>processor just trying to deal with me constantly ripping datasets out of
>>the plot and replacing them.
>>
>>I have been through the gtkextra-2 code, and I can't see a better way,
>>but I *know* there has to be one!   Can anybody provide a pointer to a
>>better way of doing this?
>>
>>Thanks!
>>
>>-Al
>>
>>
>>
>>
>>
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>>    
>>
>
>
>
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