That's my problem...

I've a gps device sending coordinates to a my applications.. my app so.. get coordinates and move a pushpin on the MapPoint control. Till here everything is ok. Now tha problem is that... I move the pushpin and center the map to the pushpin location.. but the control is redraw each time.. is there a way to lock this redraw??? or better.. recenter the map only if pushpin location is out of vievable area?

Hi,

LocationToX and LocationToY return -1 if Location object is outside visible area, so you can use these 2 to recenter when needed.

Can you post me an example.. i use this code:

//mTarget = my moving pushpin
mTarger.Location = this.mMap.GetLocation(lat, lon, 0);

//mLoc is a MapPoint.Location
mLoc = this.mMap.GetLocation(lat, lon, 0);

//the place where i center the map
mLoc.GoTo();

Can you show me how to adapt my code to work with LocationTox and Y

regards
Gianmaria

Hi,

this is an example in C#. (not tested)

with oMap the current map, and mLoc your location.

if(oMap.LocationToX(mLoc) <0 || oMap.LocationToY <0 )
{
mLoc.GoTo();
}

Hi,

It seems that6 the help is lying a little It does not return -1 if outside.. I tryed this and this work:

Code:

        private void centeronlyifnotinviewToolStripMenuItem_Click(object sender, EventArgs e)
        {
            double Lat = 51;
            double Lon = 4.1;
            double Alt = 20;

            Location Loc = MP.ActiveMap.GetLocation(Lat, Lon, Alt);
            MP.ActiveMap.GoToLatLong(Lat, Lon, Alt);

            Thread.Sleep(1000);

            // we place a pushpin in view
            Lat = 51.02;
            Loc = MP.ActiveMap.GetLocation(Lat, Lon, Alt);
            Pushpin PP = MP.ActiveMap.AddPushpin(Loc, "");
            PP.Symbol = 1;

            // if location is out of view then we center again
            if &#40;MP.ActiveMap.LocationToX&#40;Loc&#41; < 0 ||
                MP.ActiveMap.LocationToX&#40;Loc&#41; > MP.ActiveMap.Width ||
                MP.ActiveMap.LocationToY&#40;Loc&#41; < 0 ||
                MP.ActiveMap.LocationToY&#40;Loc&#41; > MP.ActiveMap.Height&#41;
                PP.GoTo&#40;&#41;;

            Thread.Sleep&#40;1000&#41;; // does not center

            // we move the pushpin out of view
            Lat = 50;
            Loc = MP.ActiveMap.GetLocation&#40;Lat, Lon, Alt&#41;;
            PP = MP.ActiveMap.AddPushpin&#40;Loc, ""&#41;;
            PP.Symbol = 1;

            // if location is out of view then we center again
            if &#40;MP.ActiveMap.LocationToX&#40;Loc&#41; < 0 ||
                MP.ActiveMap.LocationToX&#40;Loc&#41; > MP.ActiveMap.Width ||
                MP.ActiveMap.LocationToY&#40;Loc&#41; < 0 ||
                MP.ActiveMap.LocationToY&#40;Loc&#41; > MP.ActiveMap.Height&#41;
                    PP.GoTo&#40;&#41;;  // jipieeee it centers &#58;&#41;
        &#125;