/// <summary>
/// Determines if the fence intersects a supplied world coordinate bounding extent
/// </summary>
/// <param name="extent"></param>
/// <returns></returns>
public bool IntersectsExtent(BoundingWorldExtent3D extent)
{
// Check extent vertex inclusion in the fence
if (IncludesPoint(extent.MinX, extent.MinY) ||
IncludesPoint(extent.MinX, extent.MaxY) ||
IncludesPoint(extent.MaxX, extent.MinY) ||
IncludesPoint(extent.MaxX, extent.MaxY))
{
return(true);
}
// Check fence vertex inclusion in Extents
foreach (FencePoint pt in Points)
{
if (extent.Includes(pt.X, pt.Y))
{
return(true);
}
}
// Check for intersecting lines
if (IncludesLine(extent.MinX, extent.MinY, extent.MinX, extent.MaxY) ||
IncludesLine(extent.MinX, extent.MaxY, extent.MaxX, extent.MaxY) ||
IncludesLine(extent.MaxX, extent.MaxY, extent.MaxX, extent.MinY) ||
IncludesLine(extent.MaxX, extent.MinY, extent.MinX, extent.MinY))
{
return(true);
}
// The fence and the square do not intersect
return(false);
}
/// <summary>
/// Determines if the fence includes a supplied world coordinate bounding extent
/// </summary>
/// <param name="extent"></param>
/// <returns></returns>
public bool IncludesExtent(BoundingWorldExtent3D extent)
{
// Check extent vertex inclusion in the fence
if (!(IncludesPoint(extent.MinX, extent.MinY) &&
IncludesPoint(extent.MinX, extent.MaxY) &&
IncludesPoint(extent.MaxX, extent.MinY) &&
IncludesPoint(extent.MaxX, extent.MaxY)))
{
return(false);
}
if (IsRectangle || IsSquare)
{
// No Further checks are necessary, it is included
return(true);
}
// Check fence vertex inclusion in Extents
for (int i = 0, limit = Points.Count; i < limit; i++)
{
var pt = Points[i];
if (extent.Includes(pt.X, pt.Y))
{
// There must be some area of the extent that does not reside in the filter
return(false);
}
}
// Check for intersecting lines. Intersection means at least part of the given extent must lie outside the fence
if (BoundaryIntersectsLine(extent.MinX, extent.MinY, extent.MinX, extent.MaxY) ||
BoundaryIntersectsLine(extent.MinX, extent.MaxY, extent.MaxX, extent.MaxY) ||
BoundaryIntersectsLine(extent.MaxX, extent.MaxY, extent.MaxX, extent.MinY) ||
BoundaryIntersectsLine(extent.MaxX, extent.MinY, extent.MinX, extent.MinY))
{
return(false);
}
// The fence must include the square
return(true);
}
/// <summary>
/// Constructor that creates a rectangular fence from a world coordinate bounding extent
/// </summary>
public Fence(BoundingWorldExtent3D extent) : this(extent.MinX, extent.MinY, extent.MaxX, extent.MaxY)
{
}
