[OpenMap Users] Speed Issues

From: Gatrell, Mark (UK) <"Gatrell,>
Date: Fri, 23 Jul 2004 09:38:28 +0100

Hi all

        I am experiencing speed problems with my application...

        First the system:-
2.4Ghz P4
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



  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






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Received on Fri Jul 23 2004 - 04:42:31 EDT

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