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++;
}
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Received on Fri Jul 23 2004 - 09:29:26 EDT