/// <summary>
/// 将聚合对象加入到聚合中
/// </summary>
/// <param name="ci"></param>
public void AddGraphics(ClusterItem ci)
{
double x = 0, y = 0, sx = ScreenLocation.X * Graphics.Count, sy = ScreenLocation.Y * Graphics.Count;
foreach (var g in ci.Graphics)
{
Graphics.Add(g);
}
sx += ci.ScreenLocation.X * ci.Graphics.Count;
sy += ci.ScreenLocation.Y * ci.Graphics.Count;
ci.Graphics.Clear();
foreach (var g in Graphics)
{
var point = g.Geometry as MapPoint;
if (point != null)
{
x += point.X;
}
var mapPoint = g.Geometry as MapPoint;
if (mapPoint != null)
{
y += mapPoint.Y;
}
}
_center = new MapPoint(x / Graphics.Count, y / Graphics.Count);
ScreenLocation = new Point(sx / Graphics.Count, sy / Graphics.Count);
_size = 25 + Graphics.Count / 20;
}
/// <summary>
/// 判断两个聚合对象是否需要被聚合
/// </summary>
/// <param name="ci"></param>
/// <param name="buffer">缓冲区</param>
/// <returns></returns>
public bool IncludeCluster(ClusterItem ci, double buffer)
{
var pt1 = ci.ScreenLocation;
var pt2 = ScreenLocation;
var dis = Math.Sqrt(Math.Pow(pt1.X - pt2.X, 2) + Math.Pow(pt1.Y - pt2.Y, 2));
return(dis <= buffer + 1.0 * (_size + ci._size) / 2);
}