/// <summary>
/// Offsets an arc along the offset direction from the point on the arc.
/// </summary>
/// <param name="arc">The arc.</param>
/// <param name="offsetPntOnArc">The point on the arc.</param>
/// <param name="offset">The offset vector.</param>
/// <returns>The offset Arc.</returns>
private static Arc OffsetArc(Arc arc, XYZ offsetPntOnArc, XYZ offset)
{
if (arc == null || offset == null)
{
throw new ArgumentNullException();
}
if (offset.IsZeroLength())
{
return(arc);
}
XYZ axis = arc.Normal.Normalize();
XYZ offsetAlongAxis = axis.Multiply(offset.DotProduct(axis));
XYZ offsetOrthAxis = offset - offsetAlongAxis;
XYZ offsetPntToCenter = (arc.Center - offsetPntOnArc).Normalize();;
double signedOffsetLengthTowardCenter = offsetOrthAxis.DotProduct(offsetPntToCenter);
double newRadius = arc.Radius - signedOffsetLengthTowardCenter; // signedOffsetLengthTowardCenter > 0, minus, < 0, add
Arc offsetArc = m_appCreation.NewArc(arc.Center, newRadius, arc.get_EndParameter(0), arc.get_EndParameter(1), arc.XDirection, arc.YDirection);
offsetArc = GeometryUtil.MoveCurve(offsetArc, offsetAlongAxis) as Arc;
return(offsetArc);
}
/// <summary>
/// Checks if edges are congruent.
/// </summary>
/// <param name="faceEdgeDic">The collection contains potential path edges on the side faces.</param>
/// <returns>True if congruent, false otherwise.</returns>
private static bool AreEdgesSimpleCongruent(Dictionary <Face, List <Edge> > faceEdgeDic)
{
if (faceEdgeDic == null || faceEdgeDic.Count == 0)
{
return(false);
}
foreach (Face face in faceEdgeDic.Keys)
{
List <Edge> edges = faceEdgeDic[face];
if (edges.Count != 2)
{
return(false);
}
Curve curve0 = edges[0].AsCurveFollowingFace(face);
Curve curve1 = edges[1].AsCurveFollowingFace(face);
if (curve0 is Line)
{
if (!(curve1 is Line))
{
return(false);
}
XYZ moveDir = curve1.get_EndPoint(1) - curve0.get_EndPoint(0);
Curve movedCurve = GeometryUtil.MoveCurve(curve0, moveDir);
if (movedCurve.Intersect(curve1) != SetComparisonResult.Equal)
{
return(false);
}
continue;
}
else if (curve0 is Arc)
{
if (!(curve1 is Arc))
{
return(false);
}
Arc arc0 = curve0 as Arc;
XYZ offsetVec = curve1.get_EndPoint(1) - curve0.get_EndPoint(0);
Arc offsetArc = OffsetArc(arc0, curve0.get_EndPoint(0), offsetVec);
if (offsetArc.Intersect(curve1) != SetComparisonResult.Equal)
{
return(false);
}
continue;
}
// not support other types of curves for now
return(false);
}
return(true);
}