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Poor performance when drawing a Polyline in an Eclipse View [message #714806]

Thu, 11 August 2011 10:29

Eclipse User

I'm using GEF's Polyline figure to display an audio waveform in one of my Eclipse RCP application's view. I'm using a ScrollingGraphicalViewer and a ScalableFreeformRootEditPart as the root edit part. When the polyline has about 1 million points, the initial drawing and all repainting of the figure from there on, specially those caused by scrolling, get really slow. The polyline contains 1 million+ points but only about one thousand of them are displayed at a time.

I tried adding a ClippingStrategy to the parent of the Polyline, to explicitly clip the polyline to the section made visible by its parent FreeformViewport object. This approach didn't improve the drawing performance even when setting antialias to SWT.OFF on the Polyline object.

Do you or anyone in this forum have any suggestions for me? Could you please share how to efficiently display signals in an RCP application?

Any help will be greatly appreciated

Re: Poor performance when drawing a Polyline in an Eclipse View [message #715558 is a reply to message #714806]

Sun, 14 August 2011 09:18

Eclipse User

Hi Joel,

Add more memory and see what happens. Otherwise, try the gef group.

Regards,

Wim

> I'm using GEF's Polyline figure to display an audio waveform in one of my
Eclipse RCP application's view. I'm using a ScrollingGraphicalViewer and a
ScalableFreeformRootEditPart as the root edit part. When the polyline has
about 1 million points, the initial drawing and all repainting of the figure
from there on, specially those caused by scrolling, get really slow. The
polyline contains 1 million+ points but only about one thousand of them are
displayed at a time.
>
> I tried adding a ClippingStrategy to the parent of the Polyline, to
explicitly clip the polyline to the section made visible by its parent
FreeformViewport object. This approach didn't improve the drawing performance
even when setting antialias to SWT.OFF on the Polyline object.
>
> Do you or anyone in this forum have any suggestions for me? Could you
please share how to efficiently display signals in an RCP application?
>
> Any help will be greatly appreciated

Re: Poor performance when drawing a Polyline in an Eclipse View [message #715593 is a reply to message #715558]

Sun, 14 August 2011 13:54

Eclipse User

Wim, Thanks for your response. I tried adding more memory and that didn't fix it. Could you please elaborate on your "GEF group" suggestion?

Thanks!

Re: Re: Poor performance when drawing a Polyline in an Eclipse View [message #716867 is a reply to message #715593]

Thu, 18 August 2011 11:43

Eclipse User

Hi Joel,

There is a special forum for gef: eclipse.tools.gef

Regards,

wim

> Wim, Thanks for your response. I tried adding more memory and that didn't
fix it. Could you please elaborate on your "GEF group" suggestion?
>
> Thanks!

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