goobnoob wrote:
> I have a simple application in mind where I would like to zoom the map
> to show a collection of nearby points on a map. Is there a way to
> tell the map to zoom to show a range of lats longs, or a collection of
> locations?
>
> goob
> >
>
>
This is some code that pull group of location on to a screen so that you
can see then all
package com.cyberspace.location;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.RectF;
import com.cyberspace.location.db.DbHelper;
import com.cyberspace.location.db.Waypoint;
import com.google.android.maps.Overlay;
import com.google.android.maps.Point;
import com.google.googlenav.map.MapPoint;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
public class LocationOverlay extends Overlay {
private List<Waypoint> entries;
private DbHelper dbHelper;
WhatsAroundMe whatsAroundMe;
private Paint paint1 = new Paint();
private Paint paint2 = new Paint();
// Minimum & maximum latitude so we can span it
// The latitude is clamped between -80 degrees and +80 degrees
inclusive
// thus we ensure that we go beyond that number
private int minLatitude = (int)(+81 * 1E6);
private int maxLatitude = (int)(-81 * 1E6);
// Minimum & maximum longitude so we can span it
// The longitude is clamped between -180 degrees and +180 degrees
inclusive
// thus we ensure that we go beyond that number
private int minLongitude = (int)(+181 * 1E6);
private int maxLongitude = (int)(-181 * 1E6);
public LocationOverlay(WhatsAroundMe whatsAroundMe) {
this.whatsAroundMe = whatsAroundMe;
dbHelper = new DbHelper(whatsAroundMe);
// paint1.setARGB(255, 255, 255, 255);
}
@Override
public void draw(Canvas canvas, PixelCalculator pixelCalculator,
boolean b) {
super.draw(canvas, pixelCalculator, b);
List<Point> mPoints = new ArrayList<Point>();
entries = dbHelper.fetchAllRows();
for(int i = 0; i<entries.size(); i++)
{
int[] screenCoordsAll = new int[2];
Double latitude = Double.valueOf(entries.get(i).xCoord)
* 1E6;
Double longitude = Double.valueOf(entries.get(i).yCoord)
* 1E6;
if (latitude.intValue() != 0 && longitude.intValue() !=0) {
minLatitude = (minLatitude > latitude.intValue()) ?
latitude.intValue() : minLatitude;
maxLatitude = (maxLatitude < latitude.intValue()) ?
latitude.intValue() : maxLatitude;
// Sets the minimum and maximum latitude so we can
span and zoom
minLongitude = (minLongitude > longitude.intValue())
? longitude.intValue() : minLongitude;
maxLongitude = (maxLongitude < longitude.intValue())
? longitude.intValue() : maxLongitude;
mPoints.add(new Point(latitude.intValue(),
longitude.intValue()));
}
MapPoint point = new MapPoint(latitude.intValue(),
longitude.intValue());
MapPointToScreenCoords(point,
screenCoordsAll,pixelCalculator);
canvas.drawCircle(screenCoordsAll[0],
screenCoordsAll[1], 9, paint1);
}
whatsAroundMe.mc.zoomToSpan((maxLatitude - minLatitude),
(maxLongitude - minLongitude));
//TODO work on zoom in and out
whatsAroundMe.mc.animateTo(new Point(
(maxLatitude + minLatitude)/2,
(maxLongitude + minLongitude)/2 ));
}
private void MapPointToScreenCoords(MapPoint mp, int[]
targetScreenCoords, PixelCalculator pxc){
Point p = new Point(mp.getLatitude(), mp.getLongitude());
pxc.getPointXY(p, targetScreenCoords);
// whatsAroundMe.mc.animateTo(p);
}
}
Peter
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