/// <summary>
/// 获取两个矩形的最小外包矩形
/// </summary>
/// <param name="mbr1"></param>
/// <param name="mbr2"></param>
/// <returns>两个矩形的最小外包矩形</returns>
public static MyRectangle GetMBR(MyRectangle mbr1, MyRectangle mbr2)
{
double minx = Math.Min(mbr1.MinX, mbr2.MinX);
double maxx = Math.Min(mbr1.MaxX, mbr2.MaxX);
double miny = Math.Min(mbr1.MinY, mbr2.MinY);
double maxy = Math.Min(mbr1.MaxY, mbr2.MaxY);
return(new MyRectangle(minx, maxx, miny, maxy));
}
public static bool IsPointsPartInRectangle(PointF[] points, MyRectangle rect)
{
for (int i = 0; i < points.Length; i++)
{
if (IsPointInBox(new MyPoint(points[i].X, points[i].Y), rect) == true)
{
return(true);
}
}
return(false);
}
/// <summary>
/// 根据矩形盒选择要素，矩形盒坐标位于投影坐标系
/// </summary>
/// <param name="box">矩形盒</param>
internal override List <int> SelectByBox(MyRectangle box)
{
List <int> selectedID = new List <int>();
for (int i = 0; i < polygons.Count; i++)
{
polygons[i].Selected = GeometryTools.IsPolygonCompleteInBox(polygons[i], box);
if (polygons[i].Selected == true)
{
selectedID.Add(i);
}
}
return(selectedID);
}
/// <summary>
/// 判断一个多边形是否完全位于矩形盒内
/// </summary>
/// <param name="polygon"></param>
/// <param name="box"></param>
/// <returns></returns>
public static bool IsPolygonCompleteInBox(MyMultiPolygon polygon, MyRectangle box)
{
int sPointCount = polygon.PointCount;
for (int i = 0; i < sPointCount; i++)
{
MyPoint pointXY = ETCProjection.LngLat2XY(polygon.Points[i]); //投影坐标系下的坐标
if (IsPointInBox(pointXY, box) == false)
{
return(false);
}
}
return(true);
}
/// <summary>
/// 根据矩形盒选择要素，矩形盒坐标位于投影坐标系
/// </summary>
/// <param name="box">矩形盒</param>
internal override List <int> SelectByBox(MyRectangle box)
{
List <int> selectedID = new List <int>();
for (int i = 0; i < myPoints.Count; i++)
{
MyPoint pointXY = ETCProjection.LngLat2XY(myPoints[i]); //投影坐标系下的坐标
myPoints[i].Selected = GeometryTools.IsPointInBox(pointXY, box);
if (myPoints[i].Selected == true)
{
selectedID.Add(i);
}
}
return(selectedID);
}
/// <summary>
/// 判断一个点是否位于矩形盒内
/// </summary>
/// <param name="point"></param>
/// <param name="box"></param>
/// <returns></returns>
public static bool IsPointInBox(MyPoint point, MyRectangle box)
{
if (point.X < box.MinX || point.X > box.MaxX)
{
return(false);
}
else if (point.Y < box.MinY || point.Y > box.MaxY)
{
return(false);
}
else
{
return(true);
}
}
/// <summary> /// 根据矩形盒选择要素 /// </summary> /// <param name="box">矩形盒</param> internal abstract List <int> SelectByBox(MyRectangle box);