// add objects and zone around them
void AddDemoZone(double areaRadius, PointLatLng center, List<PointAndInfo> objects)
{
var objectsInArea = from p in objects
where MainMap.MapProvider.Projection.GetDistance(center, p.Point) <= areaRadius
select new
{
Obj = p,
Dist = MainMap.MapProvider.Projection.GetDistance(center, p.Point)
};
if (objectsInArea.Any())
{
var maxDistObject = (from p in objectsInArea
orderby p.Dist descending
select p).First();
// add objects to zone
foreach (var o in objectsInArea)
{
GMapMarker it = new GMapMarker(o.Obj.Point);
{
it.ZIndex = 55;
var s = new CustomMarkerDemo(this, it, o.Obj.Info + ", distance from center: " + o.Dist + "km.");
it.Shape = s;
}
MainMap.Markers.Add(it);
}
// add zone circle
{
GMapMarker it = new GMapMarker(center);
it.ZIndex = -1;
Circle c = new Circle();
c.Center = center;
c.Bound = maxDistObject.Obj.Point;
c.Tag = it;
c.IsHitTestVisible = false;
UpdateCircle(c);
Circles.Add(it);
it.Shape = c;
MainMap.Markers.Add(it);
}
}
}
// calculates circle radius
void UpdateCircle(Circle c)
{
var pxCenter = MainMap.FromLatLngToLocal(c.Center);
var pxBounds = MainMap.FromLatLngToLocal(c.Bound);
double a = (double)(pxBounds.X - pxCenter.X);
double b = (double)(pxBounds.Y - pxCenter.Y);
var pxCircleRadius = Math.Sqrt(a * a + b * b);
c.Width = 55 + pxCircleRadius * 2;
c.Height = 55 + pxCircleRadius * 2;
(c.Tag as GMapMarker).Offset = new System.Windows.Point(-c.Width / 2, -c.Height / 2);
}
