/// <summary>
/// 指示指定复合折线是否部分或完全位于指定矩形盒内
/// </summary>
/// <param name="multipolyline"></param>
/// <param name="box"></param>
/// <returns></returns>
public static bool IsMultiPolylinePartiallyWithinBox(moMultiPolyline multipolyline, moRectangle box)
{
//思路：先判断矩形盒是否相交，如是，按如下顺序，满足任何一个条件，则返回True
//（1）复合折线任何一个点位于矩形盒内;
//（2）矩形盒与复合折线有交点
moRectangle sBox = multipolyline.GetEnvelope();
if (AreBoxesCross(sBox, box) == false)
{
return(false);
}
//（1）复合折线任何一个点位于矩形盒内;
Int32 sPartCount = multipolyline.Parts.Count;
for (Int32 i = 0; i <= sPartCount - 1; i++)
{
Int32 sPointCount = multipolyline.Parts.GetItem(i).Count;
for (Int32 j = 0; j <= sPointCount - 1; j++)
{
moPoint sCurPoint = multipolyline.Parts.GetItem(i).GetItem(j);
if (IsPointWithinBox(sCurPoint, box) == true)
{
return(true);
}
}
}
//（2）矩形盒与复合折线有交点
for (Int32 i = 0; i <= sPartCount - 1; i++)
{
moPoints sPoints = multipolyline.Parts.GetItem(i);
Int32 sPointCount = sPoints.Count;
for (Int32 j = 0; j <= sPointCount - 2; j++)
{
if (IsSegmentCrossBox(sPoints.GetItem(j), sPoints.GetItem(j + 1), box) == true)
{
return(true);
}
}
}
//（3）都不满足，返回false
return(false);
}
/// <summary>
/// 获取外包矩形
/// </summary>
/// <returns></returns>
public moRectangle GetEnvelope()
{
moRectangle sRect = null;
if (_ShapeType == moGeometryTypeConstant.Point)
{
moPoint sPoint = (moPoint)_Geometry;
sRect = new moRectangle(sPoint.X, sPoint.X, sPoint.Y, sPoint.Y);
}
else if (_ShapeType == moGeometryTypeConstant.MultiPolyline)
{
moMultiPolyline sMultiPolyline = (moMultiPolyline)_Geometry;
sRect = sMultiPolyline.GetEnvelope();
}
else
{
moMultiPolygon sMultiPolygon = (moMultiPolygon)_Geometry;
sRect = sMultiPolygon.GetEnvelope();
}
return(sRect);
}