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Gianmaria · #1 (**permalink**) 03-18-2005

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?

**Wilfried** · #2 (**permalink**) 03-19-2005

Hi,

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

Gianmaria · #3 (**permalink**) 03-22-2005

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

Jeurink · #4 (**permalink**) 03-22-2005

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();
}

**Wilfried** · #5 (**permalink**) 03-22-2005

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 (MP.ActiveMap.LocationToX(Loc) < 0 ||
                MP.ActiveMap.LocationToX(Loc) > MP.ActiveMap.Width ||
                MP.ActiveMap.LocationToY(Loc) < 0 ||
                MP.ActiveMap.LocationToY(Loc) > MP.ActiveMap.Height)
                PP.GoTo();

            Thread.Sleep(1000); // does not center

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

            // if location is out of view then we center again
            if (MP.ActiveMap.LocationToX(Loc) < 0 ||
                MP.ActiveMap.LocationToX(Loc) > MP.ActiveMap.Width ||
                MP.ActiveMap.LocationToY(Loc) < 0 ||
                MP.ActiveMap.LocationToY(Loc) > MP.ActiveMap.Height)
                    PP.GoTo();  // jipieeee it centers :)
        }

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Center pushin only if out of viewable area??

Center pushin only if out of viewable area??

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MapForums

Center pushin only if out of viewable area??

Center pushin only if out of viewable area??

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)

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