/// <summary>
/// Gets the intersection of a plane at the specified height as a list of contours (i.e a list of 2D polygons).
/// </summary>
/// <param name="elevation">The elevation.</param>
/// <returns>List<BarrierPolygons>.</returns>
public List <BarrierPolygon> GetIntersection(double elevation)
{
var edges = new List <UVLine>();
foreach (var item in this._faces)
{
if (item.Intersects(elevation))
{
var edge = item.GetIntersection(elevation);
UV p1 = new UV(edge.Start.X, edge.Start.Y);
UV p2 = new UV(edge.End.X, edge.End.Y);
edges.Add(new UVLine(p1, p2));
}
}
var plines = PLine.ExtractPLines(edges);
List <BarrierPolygon> boundary = new List <BarrierPolygon>();
foreach (PLine item in plines)
{
var oneBoundary = item.Simplify(0.001d, 0.0001d);
if (oneBoundary != null)
{
var polygon = new BarrierPolygon(oneBoundary.ToArray())
{
IsClosed = item.Closed
};
boundary.Add(polygon);
}
}
return(boundary);
}
/// <summary>
/// Gets the field boundary polygons.
/// </summary>
/// <param name="cellularFloor">The cellular floor.</param>
/// <returns>List<BarrierPolygons>.</returns>
public static List <BarrierPolygon> GetFieldBoundary(CellularFloor cellularFloor)
{
Dictionary <UVLine, int> guid = new Dictionary <UVLine, int>();
foreach (var item in cellularFloor.Cells)
{
if (item.FieldOverlapState == OverlapState.Inside)
{
var lines = cellularFloor.CellToLines(item);
foreach (var line in lines)
{
if (guid.ContainsKey(line))
{
guid[line]++;
}
else
{
guid.Add(line, 1);
}
}
}
}
List <UVLine> boundaryLines = new List <UVLine>();
foreach (KeyValuePair <UVLine, int> item in guid)
{
if (item.Value == 1)
{
boundaryLines.Add(item.Key);
}
}
guid.Clear();
guid = null;
var pLines = PLine.ExtractPLines(boundaryLines);
List <BarrierPolygon> boundary = new List <BarrierPolygon>();
foreach (PLine item in pLines)
{
var oneBoundary = item.Simplify(cellularFloor.CellSize / 10);
if (oneBoundary != null)
{
boundary.Add(new BarrierPolygon(oneBoundary.ToArray()));
}
}
boundaryLines.Clear();
boundaryLines = null;
return(boundary);
}
/// <summary>
/// Gets the boundary polygons of a collection of cells.
/// </summary>
/// <param name="cellIDs">The visible cells.</param>
/// <param name="cellularFloor">The cellular floor.</param>
/// <returns>List<BarrierPolygons>.</returns>
public static List <BarrierPolygon> GetBoundary(ICollection <int> cellIDs, CellularFloorBaseGeometry cellularFloor)
{
Dictionary <UVLine, int> guid = new Dictionary <UVLine, int>();
foreach (var item in cellIDs)
{
var lines = cellularFloor.CellToLines(cellularFloor.FindCell(item));
foreach (var line in lines)
{
if (guid.ContainsKey(line))
{
guid[line]++;
}
else
{
guid.Add(line, 1);
}
}
}
List <UVLine> boundaryLines = new List <UVLine>();
foreach (KeyValuePair <UVLine, int> item in guid)
{
if (item.Value == 1)
{
boundaryLines.Add(item.Key);
}
}
guid.Clear();
guid = null;
var plines = PLine.ExtractPLines(boundaryLines);
List <BarrierPolygon> boundary = new List <BarrierPolygon>();
foreach (PLine item in plines)
{
var oneBoundary = item.Simplify(cellularFloor.CellSize / 10);
if (oneBoundary != null)
{
boundary.Add(new BarrierPolygon(oneBoundary.ToArray()));
}
}
boundaryLines.Clear();
boundaryLines = null;
return(boundary);
}
