public void TestFindInputSegmentSiteException()
{
List<Point> inputPoint = new List<Point>() { new Point(5, 5) };
List<Segment> inputSegment = new List<Segment>();
inputSegment.Add(new Segment(0, 0, 0, 10));
inputSegment.Add(new Segment(0, 0, 10, 0));
inputSegment.Add(new Segment(0, 10, 10, 10));
inputSegment.Add(new Segment(10, 0, 10, 10));
//Build the C# Voronoi
BoostVoronoi bv = new BoostVoronoi();
foreach (var p in inputPoint)
bv.AddPoint(p.X, p.Y);
foreach (var s in inputSegment)
bv.AddSegment(s.Start.X, s.Start.Y, s.End.X, s.End.Y);
bv.Construct();
List<Vertex> vertices = bv.Vertices;
List<Edge> sharpEdges = bv.Edges;
List<Cell> cells = bv.Cells;
for (int i = 0; i < cells.Count; i++)
{
if (cells[i].SourceCategory != CellSourceCatory.InitialSegment
&& cells[i].SourceCategory != CellSourceCatory.ReverseSegment)
{
bv.RetrieveInputSegment(cells[i]);
}
}
}
private ISegmentCollection createSegments(Cell cell,BoostVoronoi bv,ArcConstructionMethods method,ISpatialReference spatialReference)
{
List<Cell> cells = bv.Cells;
List<Edge> edges = bv.Edges;
List<Vertex> vertices = bv.Vertices;
IPoint previousEndPoint = null;
ISegmentCollection segmentCollection = new PolygonClass() { SpatialReference = spatialReference };
// As per boost documentation, edges are returned in counter clockwise (CCW) rotation.
// voronoi_edge_type* next() Returns the pointer to the CCW next edge within the corresponding Voronoi cell. Edges not necessarily share a common vertex (e.g. infinite edges).
for (int i = cell.EdgesIndex.Count - 1; i >= 0; i--)
{
Edge edge = edges[cell.EdgesIndex[i]];
//If the vertex index equals -1, it means the edge is infinite. It is impossible to print the coordinates.
if (!edge.IsFinite && edge.End < 0)
{
// this is the ending portion of a pair of infinite edges, file the previous edge with Start >= 0
Edge previous = null;
for (int k = i + 1; k < cell.EdgesIndex.Count; k++)
{
previous = edges[cell.EdgesIndex[k]];
if (previous.End >= 0)
break;
previous = null;
}
if (previous == null)
{
for (int k = 0; k < i; k++)
{
previous = edges[cell.EdgesIndex[k]];
if (previous.End >= 0)
break;
previous = null;
}
}
if (previous == null)
throw new Exception("No outbound infinite edge could be found");
//Add a straight line segment
Vertex start = vertices[previous.End];
IPoint FromPoint = new PointClass() { X = start.X, Y = start.Y, SpatialReference = spatialReference };
Vertex end = vertices[edge.Start];
IPoint ToPoint = new PointClass() { X = end.X, Y = end.Y, SpatialReference = spatialReference };
segmentCollection.AddSegment(new LineClass() { FromPoint = FromPoint, ToPoint = ToPoint, SpatialReference = spatialReference });
previousEndPoint = ToPoint;
}
else if (edge.IsFinite)
{
Vertex start = vertices[edge.End];
IPoint FromPoint = new PointClass() { X = start.X, Y = start.Y, SpatialReference = spatialReference };
if (previousEndPoint != null)
{
if ((Math.Abs(previousEndPoint.X - FromPoint.X) > 0.05 || Math.Abs(previousEndPoint.X - FromPoint.X) > 0.05))
throw new Exception("Significant change between last end point and current start point");
else
FromPoint = previousEndPoint;
}
Vertex end = vertices[edge.Start];
IPoint ToPoint = new PointClass() { X = end.X, Y = end.Y, SpatialReference = spatialReference };
if (method == ArcConstructionMethods.Straight || edge.IsLinear)
{
segmentCollection.AddSegment(new LineClass() { FromPoint = FromPoint, ToPoint = ToPoint, SpatialReference = spatialReference });
previousEndPoint = ToPoint;
}
else
{
// We need three points, use start, end, mid-point between focus and directrix
Cell twinCell = cells[edges[edge.Twin].Cell];
VPoint pointSite; VSegment lineSite;
if (cell.ContainsPoint && twinCell.ContainsSegment)
{
pointSite = bv.RetrieveInputPoint(cell);
lineSite = bv.RetrieveInputSegment(twinCell);
}
else if (cell.ContainsSegment && twinCell.ContainsPoint)
{
pointSite = bv.RetrieveInputPoint(twinCell);
lineSite = bv.RetrieveInputSegment(cell);
}
else
{
throw new Exception("Invalid edge, curves should only be present between a point and a line");
}
double scaleFactor = Convert.ToDouble(bv.ScaleFactor);
IPoint aoPointSite = new Point()
{
X = Convert.ToDouble(pointSite.X) / scaleFactor,
Y = Convert.ToDouble(pointSite.Y) / scaleFactor,
SpatialReference = spatialReference
};
ISegment aoLineSite = new LineClass()
{
FromPoint = new PointClass()
{
X = Convert.ToDouble(lineSite.Start.X) / scaleFactor,
Y = Convert.ToDouble(lineSite.Start.Y) / scaleFactor,
SpatialReference = spatialReference
},
ToPoint = new PointClass()
{
X = Convert.ToDouble(lineSite.End.X) / scaleFactor,
Y = Convert.ToDouble(lineSite.End.Y) / scaleFactor,
SpatialReference = spatialReference
},
SpatialReference = spatialReference
};
if (method == ArcConstructionMethods.Approximate)
{
List<Vertex> sampledVerticed = null;
try
{
sampledVerticed = bv.SampleCurvedEdge(edge, aoLineSite.Length / 10);
}
catch (FocusOnDirectixException e)
{
//Log any exception here is required
sampledVerticed = new List<Vertex>() { start, end };
}
catch (UnsolvableVertexException e)
{
sampledVerticed = new List<Vertex>() { start, end };
}
sampledVerticed.Reverse();
List<IPoint> discretizedEdge = sampledVerticed.Select(
p => new Point() { X = p.X, Y = p.Y }
).ToList<IPoint>();
IPoint prev = discretizedEdge[0];
foreach (IPoint v in discretizedEdge.Skip(1))
{
segmentCollection.AddSegment(new LineClass()
{
FromPoint = new Point() { X = prev.X, Y = prev.Y, SpatialReference = spatialReference },
ToPoint = new Point() { X = v.X, Y = v.Y, SpatialReference = spatialReference },
SpatialReference = spatialReference
});
prev = v;
}
previousEndPoint = discretizedEdge.Last();
}
else if (method == ArcConstructionMethods.Circular)
{
IPoint nearPoint = ((IProximityOperator)aoLineSite).ReturnNearestPoint(aoPointSite, esriSegmentExtension.esriNoExtension);
IPoint midpoint = new PointClass()
{
X = (nearPoint.X + aoPointSite.X) / 2,
Y = (nearPoint.Y + aoPointSite.Y) / 2,
SpatialReference = spatialReference
};
IConstructCircularArc constArc = new CircularArcClass() { SpatialReference = spatialReference };
constArc.ConstructThreePoints(FromPoint, midpoint, ToPoint, false);
ICircularArc arc = (ICircularArc)constArc;
if (!arc.IsMinor)
{
constArc = new CircularArcClass() { SpatialReference = spatialReference };
constArc.ConstructEndPointsRadius(FromPoint, ToPoint, !arc.IsCounterClockwise, arc.Radius, true);
arc = (ICircularArc)constArc;
}
segmentCollection.AddSegment((ISegment)arc);
previousEndPoint = arc.ToPoint;
}
else if (method == ArcConstructionMethods.Ellipse)
{
IPoint nearPoint = ((IProximityOperator)aoLineSite).ReturnNearestPoint(aoPointSite, esriSegmentExtension.esriExtendTangents);
nearPoint.SpatialReference = spatialReference;
ILine lineToFocus = new LineClass() { FromPoint = nearPoint, ToPoint = aoPointSite, SpatialReference = spatialReference };
ILine semiMajor = new LineClass() { SpatialReference = spatialReference };
lineToFocus.QueryTangent(esriSegmentExtension.esriExtendTangentAtTo, 1, true, 100 * lineToFocus.Length, semiMajor);
IPoint center = new PointClass()
{
X = (semiMajor.FromPoint.X + semiMajor.ToPoint.X) / 2,
Y = (semiMajor.FromPoint.Y + semiMajor.ToPoint.Y) / 2,
SpatialReference = spatialReference
};
double minor_length = Math.Sqrt(
Math.Pow(distance(semiMajor.FromPoint, ToPoint) + distance(semiMajor.ToPoint, ToPoint), 2)
- Math.Pow(semiMajor.Length, 2));
IEllipticArc arc = new EllipticArcClass() { SpatialReference = spatialReference };
double rotation = lineToFocus.Angle;
double from = GetAngle(center, FromPoint);
arc.PutCoords(false, center, FromPoint, ToPoint, rotation, minor_length / semiMajor.Length, esriArcOrientation.esriArcMinor);
segmentCollection.AddSegment((ISegment)arc);
previousEndPoint = arc.ToPoint;
}
}
}
}
return segmentCollection;
}