/// <summary>
/// Convert a Revit Arc to a ProtoGeometry Arc
/// </summary>
/// <param name="crv"></param>
/// <returns></returns>
private static Autodesk.DesignScript.Geometry.Curve Convert(Autodesk.Revit.DB.Arc crv)
{
var isCircle = !crv.IsBound ||
Math.Abs(Math.Abs(crv.GetEndParameter(1) - crv.GetEndParameter(0)) - 2*Math.PI) < 1e-6;
if ( isCircle )
{
return Circle.ByCenterPointRadiusNormal(crv.Center.ToPoint(), crv.Radius, crv.Normal.ToVector());
}
return Arc.ByCenterPointStartPointSweepAngle(crv.Center.ToPoint(), crv.GetEndPoint(0).ToPoint(),
(crv.GetEndParameter(1) - crv.GetEndParameter(0))*180/Math.PI, crv.Normal.ToVector());
}
private static Autodesk.DesignScript.Geometry.Curve Convert(Autodesk.Revit.DB.Ellipse crv)
{
var isComplete = !crv.IsBound ||
Math.Abs(Math.Abs(crv.GetEndParameter(1) - crv.GetEndParameter(0)) - 2*Math.PI) < 1e-6;
if (!isComplete)
{
var pl = Plane.ByOriginXAxisYAxis(crv.Center.ToPoint(),
crv.XDirection.ToVector(), crv.YDirection.ToVector());
var s = crv.GetEndParameter(0).ToDegrees();
var e = crv.GetEndParameter(1).ToDegrees();
return EllipseArc.ByPlaneRadiiStartAngleSweepAngle(pl, crv.RadiusX, crv.RadiusY, s, e - s);
}
return Autodesk.DesignScript.Geometry.Ellipse.ByOriginVectors(crv.Center.ToPoint(),
(crv.XDirection*crv.RadiusX).ToVector(), (crv.YDirection*crv.RadiusY).ToVector());
}
private static Autodesk.DesignScript.Geometry.Curve Convert(Autodesk.Revit.DB.NurbSpline crv)
{
var convert = NurbsCurve.ByControlPointsWeightsKnots(crv.CtrlPoints.Select(x => x.ToPoint(false)).ToArray(),
crv.Weights.Cast<double>().ToArray(), crv.Knots.Cast<double>().ToArray(), crv.Degree );
if (!crv.IsBound) return convert;
// bound the curve parametric range
// we first get the full parametric domain from the knots
// note that some knots be negative and the domain may appear reversed
var parms = crv.Knots.Cast<double>().ToList();
var fsp = parms.First();
var fep = parms.Last();
// obtain the full domain
var fd = Math.Abs(fsp - fep);
// these are the start and end parameters of the bound curve
var sp = crv.GetEndParameter(0);
var ep = crv.GetEndParameter(1);
// get the normalized parameters for trim
var nsp = Math.Abs(fsp - sp) / fd;
var nep = Math.Abs(fsp - ep) / fd;
// if there's no trimming to do, avoid it
if (Math.Abs(nsp) < 1e-6 && Math.Abs(1 - nep) < 1e-6) return convert;
return convert.ParameterTrim(nsp, nep);
}
private static Autodesk.DesignScript.Geometry.Curve Convert(Autodesk.Revit.DB.Ellipse crv)
{
var isFullEllipse = !crv.IsBound ||
Math.Abs(Math.Abs(crv.GetEndParameter(1) - crv.GetEndParameter(0)) - 2*Math.PI) < 1e-6;
if (isFullEllipse)
{
return
Autodesk.DesignScript.Geometry.Ellipse.ByOriginVectors(
crv.Center.ToPoint(false),
(crv.XDirection*crv.RadiusX).ToVector(false),
(crv.YDirection*crv.RadiusY).ToVector(false));
}
// We need to define the major and minor axis as the curve
// will be trimmed starting from the major axis (not the xaxis)
var major = Math.Max(crv.RadiusX, crv.RadiusY);
var minor = Math.Min(crv.RadiusX, crv.RadiusY);
Vector majorAxis;
Vector minorAxis;
double startParam;
var span = Math.Abs( crv.GetEndParameter(0) - crv.GetEndParameter(1)).ToDegrees();
if (crv.RadiusX > crv.RadiusY)
{
majorAxis = crv.XDirection.ToVector();
minorAxis = crv.YDirection.ToVector();
startParam = crv.GetEndParameter(0).ToDegrees();
}
else
{
majorAxis = crv.YDirection.ToVector().Reverse();
minorAxis = crv.XDirection.ToVector();
startParam = crv.GetEndParameter(0).ToDegrees() + 90;
}
var pl = Plane.ByOriginXAxisYAxis(crv.Center.ToPoint(false), majorAxis, minorAxis);
return EllipseArc.ByPlaneRadiiStartAngleSweepAngle(pl, major, minor, startParam, span);
}
private static Autodesk.DesignScript.Geometry.Curve Convert(Autodesk.Revit.DB.HermiteSpline crv)
{
var convert = HermiteToNurbs.ConvertExact(crv);
if (!crv.IsBound) return convert;
// bound the curve parametric range
// we first get the full parametric domain from the parameters
// note that some knots be negative and the domain may appear reversed
var parms = crv.Parameters.Cast<double>().ToList();
var fsp = parms.First();
var fep = parms.Last();
// obtain the full domain
var fd = Math.Abs(fsp - fep);
// these are the start and end parameters of the bound curve
var sp = crv.GetEndParameter(0);
var ep = crv.GetEndParameter(1);
// get the normalized parameters for trim
var nsp = Math.Abs(fsp - sp)/fd;
var nep = Math.Abs(fsp - ep)/fd;
// if there's no trimming to do, avoid it
if (Math.Abs(nsp) < 1e-6 && Math.Abs(1 - nep) < 1e-6) return convert;
return convert.ParameterTrim(nsp, nep);
}
