private static Curve CreateEdge(double rad, Edge edge, bool createArc)
{
Curve c = null;
if (createArc)
{
// Calculate a mid-point for our arc
var vec = edge.End - edge.Start;
var len = vec.Length;
var vmid = edge.Start + (vec * 0.5);
vec = vec.RotateBy(Math.PI * 0.5, Vector3d.ZAxis);
vec = -0.1 * vec;
var mid = vmid + vec;
// Create the initial arc between the center points of the
// two nodes, as well as circles around the nodes
var ca = new CircularArc3d(edge.Start, mid, edge.End);
var c1 = new CircularArc3d(edge.Start, Vector3d.ZAxis, rad);
var c2 = new CircularArc3d(edge.End, Vector3d.ZAxis, rad);
// Intersect the arc with the two circles
var pts1 = ca.IntersectWith(c1);
var pts2 = ca.IntersectWith(c2);
// Adjust the start and end of the arc, effectively trimming
// it to the circles
var newStart = edge.Start;
var newEnd = edge.End;
if (pts1 != null && pts1.Length > 0)
{
newStart = pts1[0];
}
if (pts2 != null && pts2.Length > 0)
{
newEnd = pts2[0];
}
// Create our new, trimmed arc, and the database version of it
var ca2 = new CircularArc3d(newStart, mid, newEnd);
c = Arc.CreateFromGeCurve(ca2);
}
else
{
// Create the line - adjusted to go from the node circles)
// and add it to the database
var vec = edge.End - edge.Start;
var unit = vec / vec.Length;
c = new Line(edge.Start + unit * rad, edge.End - unit * rad);
}
return(c);
}
public static Arc CreateArcFromRadius(this Editor acCurEd, Point3d startPoint, Point3d endPoint, double radius)
{
Arc arc = null;
var ucsMat = acCurEd.CurrentUserCoordinateSystem;
var vNormal = ucsMat.CoordinateSystem3d.Zaxis;
var pStart = startPoint.TransformBy(ucsMat); // Start point in WCS
var pEnd = endPoint.TransformBy(ucsMat); // End point in WCS
// Finding center point of arc.
var circ1 = new CircularArc3d(pStart, vNormal, radius);
var circ2 = new CircularArc3d(pEnd, vNormal, radius);
var pts = circ1.IntersectWith(circ2);
circ1.Dispose();
circ2.Dispose();
try
{
if (pts.Length < 1)
{
return(null);
}
}
catch (Exception)
{
return(null);
}
var pCenter = pts[0];
Vector3d v1 = pStart - pCenter, v2 = pEnd - pCenter;
if (v1.CrossProduct(v2).DotProduct(vNormal) < 0)
{
pCenter = pts[1];
}
var cCirc = new CircularArc3d(pCenter, vNormal, radius);
var parStart = cCirc.GetParameterOf(pStart);
var parEnd = cCirc.GetParameterOf(pEnd);
var parMid = (parStart + parEnd) * 0.5;
var pMid = cCirc.EvaluatePoint(parMid);
cCirc.Dispose();
var cArc = new CircularArc3d(pStart, pMid, pEnd);
var angle =
cArc.ReferenceVector.AngleOnPlane(new Plane(cArc.Center, cArc.Normal));
arc = new Arc(cArc.Center, cArc.Normal, cArc.Radius, cArc.StartAngle + angle, cArc.EndAngle + angle);
cArc.Dispose();
return(arc);
}