Hi Mark, Brian,
Actually, in 4.6, the BufferedImageRenderPolicy was added, so you can
automatically add image buffering to individual OMGraphicHandlerLayers
(of which VPF is one) without a code change. You just set the
renderingPolicy property (or set the object, programmatically) to one.
For the VPFLayer in 4.6, however, the BufferedImageRenderPolicy is the
default policy, so you would be seeing that benefit already.
The other thing I would try in 4.6 is to mark all layers that are not
part of the animation as 'background' layers (set via property or
programmatically). The BufferedLayerMapBean will place all of those
layers at the back of the layer stack in a separate image buffer. You
can also send layers to this buffer using the LayersPanel, there's a
line separating the layers that are buffered and those that are not,
and you just use the arrows to move the layers in/out of the buffer.
- Don
On Jul 23, 2004, at 9:22 AM, Hudson Brian R Contr AFRL/IFSF wrote:
> Hey,
>
> You could change the VPFLayer so that it renders its list to a buffer
> (BufferedImage) and then once complete, renders that image to the
> screen.
>
> I work with some very large shape files, and I had to do a similar
> thing to
> get chemical plumes animating without a serious loss in performance
> (due to
> the rendering time required to redraw the thousands of points of the
> shape
> file).
>
> You may want to take a look at the BufferedLayer, I believe you can
> add the
> VPFLayer to this layer (it has its own MapBean) and it would handle the
> buffering for you.
>
> Hope this helps,
>
> Brian Hudson
>
> -----Original Message-----
> From: owner-openmap-users_at_bbn.com [mailto:owner-openmap-users_at_bbn.com]
> On
> Behalf Of Gatrell, Mark (UK)
> Sent: Friday, July 23, 2004 4:38 AM
> To: Openmap-Users (E-mail)
> Subject: [OpenMap Users] Speed Issues
>
>
>
> Hi all
>
> I am experiencing speed problems with my application...
>
> First the system:-
> 2.4Ghz P4
> 1.5GB DDR RAM
> 128MB GForce graphics card
> 80GB drive
>
> I have set a test OmPoly graphic rotating on the screen to simulate
> a radar scan using a timer to update the position etc.
>
> The sequence below is called on every timer expiry. I.E 10ms
>
> This works fine until I turn on the VmapLevel1 data layer I.E
> railroads.When
> the Vmap data layers are on, the sweeping of the graphic appears to
> jump a
> few positions and then catches up with itself. I assume the rendering
> is
> suffering.
>
> Has anyone any ideas as to why this is happening? and maybe what I can
> do to
> improve this?
>
> Any help is appreciated
>
> regards
>
> Mark.
>
>
> public void redrawTestIcon()
> {
>
>
> // Create the new OmPoly latlong positions
>
> anglePointA = azi - TestIconAngle/2; // gives points either side of
> the
> heading to give a cone shape field of view
> anglePointB = azi + TestIconAngle/2;
>
> newLatLonPointsA = CalculateX_Y_UtmPoint(5000,anglePointA); //
> returns
> an array of latlon points.
> newLatLonPointsB = CalculateX_Y_UtmPoint(5000,anglePointB);
> float[] llPoints = new float[8];
> float[] llPointsman = new float[8];
> llPoints[0] = vanLatPosition;
> llPoints[1] = vanLonPosition;
> llPoints[2] = newLatLonPointsA[0];
> llPoints[3] = newLatLonPointsA[1];
> llPoints[4] = newLatLonPointsB[0];
> llPoints[5] = newLatLonPointsB[1];
> llPoints[6] = vanLatPosition;
> llPoints[7] = vanLonPosition;
>
> // Redraw the OmPoly
>
> TestIcon.setLocation(llPoints,OMGraphic.DECIMAL_DEGREES);
>
> TestIcon.regenerate(this.getProjection());
>
> this.repaint();
>
> azi++;
>
>
> }
>
> ********************************************************************
> This email and any attachments are confidential to the intended
> recipient
> and may also be privileged. If you are not the intended recipient
> please
> delete it from your system and notify the sender. You should not copy
> it or
> use it for any purpose nor disclose or distribute its contents to any
> other
> person.
> ********************************************************************
> --
> [To unsubscribe to this list send an email to "majdart_at_bbn.com" with
> the
> following text in the BODY of the message "unsubscribe openmap-users"]
> --
> [To unsubscribe to this list send an email to "majdart_at_bbn.com"
> with the following text in the BODY of the message "unsubscribe
> openmap-users"]
>
>
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
Don Dietrick, dietrick_at_bbn.com
BBN Technologies, Cambridge, MA
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
--
[To unsubscribe to this list send an email to "majdart_at_bbn.com"
with the following text in the BODY of the message "unsubscribe openmap-users"]
Received on Fri Jul 23 2004 - 10:42:15 EDT