public CircularArcGeometry(ICircleGeometry circle, IPosition bc, IPosition ec, bool isClockwise)
{
m_Circle = circle;
m_BC = PositionGeometry.Create(bc);
m_EC = PositionGeometry.Create(ec);
m_IsClockwise = isClockwise;
}
/// <summary>
/// Generates an approximation of a circular arc.
/// </summary>
/// <param name="tol">The maximum chord-to-circumference distance.</param>
/// <returns></returns>
public static IPointGeometry[] GetApproximation(ICircularArcGeometry g, ILength tol)
{
// Get info about the circle the curve lies on.
IPosition center = g.Circle.Center;
double radius = g.Circle.Radius;
// Determine the change in bearing which will satisfy the specified tolerance
// (if no tolerance has been specified, arbitrarily use a tolerance of 1mm on the ground).
double tolm = (tol.Meters > Double.Epsilon ? tol.Meters : 0.001);
double dbear = Math.Acos((radius - tolm) / radius);
IPointGeometry start = g.BC;
IPointGeometry end = g.EC;
bool iscw = g.IsClockwise;
// Get the total angle subtended by the curve.
Turn reft = new Turn(center, start);
double totang = reft.GetAngleInRadians(end); // clockwise
if (!iscw)
{
totang = MathConstants.PIMUL2 - totang;
}
// Figure out how many positions we'll generate
int nv = (int)(totang / dbear); // truncate
Debug.Assert(nv >= 0);
// Handle special case of very short arc.
if (nv == 0)
{
return new IPointGeometry[] { start, end }
}
;
// Sign the delta-bearing the right way.
if (!iscw)
{
dbear = -dbear;
}
// Get the initial bearing to the first position along the curve.
double curbear = reft.BearingInRadians + dbear;
// Append positions along the length of the curve.
List <IPointGeometry> result = new List <IPointGeometry>(nv);
result.Add(start);
for (int i = 0; i < nv; i++, curbear += dbear)
{
IPosition p = BasicGeom.Polar(center, curbear, radius);
result.Add(PositionGeometry.Create(p));
}
result.Add(end);
return(result.ToArray());
}
/// <summary>
/// Creates new <c>LineStringGeometry</c> that corresponds to the supplied positions (rounded
/// off to the nearest micron).
/// </summary>
/// <param name="data">The positions defining the line.</param>
public LineStringGeometry(IPosition[] data)
{
if (data == null || data.Length < 2)
{
throw new ArgumentException();
}
m_Data = new IPointGeometry[data.Length];
for (int i = 0; i < data.Length; i++)
{
m_Data[i] = PositionGeometry.Create(data[i]);
}
}
/// <summary>
/// Creates new <c>SegmentGeometry</c> that corresponds to the supplied positions.
/// </summary>
/// <param name="start">The position of the start of the line.</param>
/// <param name="end">The position of the end of the line.</param>
public LineSegmentGeometry(IPosition start, IPosition end)
{
m_Start = PositionGeometry.Create(start);
m_End = PositionGeometry.Create(end);
}