/// <summary>
/// 由于多边形创建要求环闭合，需要在调用构造函数前进行检查，故不具备用点数组作为集合的构造函数
/// </summary>
/// <param name="ring">单独外环</param>
public MLPolygon(PolylineD ring)
{
featureType = FeatureType.POLYGON;
mbr[0] = mbr[1] = ring.GetPoint(0).X;
mbr[2] = mbr[3] = ring.GetPoint(0).Y;
for (int i = 1; i < ring.Count; ++i)
{
if (ring.GetPoint(i).X < mbr[0])
{
mbr[0] = ring.GetPoint(i).X;
}
if (ring.GetPoint(i).X > mbr[1])
{
mbr[1] = ring.GetPoint(i).X;
}
if (ring.GetPoint(i).Y < mbr[2])
{
mbr[2] = ring.GetPoint(i).Y;
}
if (ring.GetPoint(i).Y > mbr[3])
{
mbr[3] = ring.GetPoint(i).Y;
}
}
pointNum = ring.Count;
polygon = new PolygonD(new PolylineD[] { ring });
}
public MLPolyline(PolylineD segment)
{
featureType = FeatureType.POLYLINE;
mbr[0] = mbr[1] = segment.GetPoint(0).X;
mbr[2] = mbr[3] = segment.GetPoint(0).Y;
for (int i = 1; i < segment.Count; ++i)
{
if (segment.GetPoint(i).X < mbr[0])
{
mbr[0] = segment.GetPoint(i).X;
}
if (segment.GetPoint(i).X > mbr[1])
{
mbr[1] = segment.GetPoint(i).X;
}
if (segment.GetPoint(i).Y < mbr[2])
{
mbr[2] = segment.GetPoint(i).Y;
}
if (segment.GetPoint(i).Y > mbr[3])
{
mbr[3] = segment.GetPoint(i).Y;
}
}
pointNum = segment.Count;
segments = new PolylineD[] { segment };
}