protected override bool WorldDraw(Autodesk.AutoCAD.GraphicsInterface.WorldDraw wd)
{
// Update the dummy vertex to be our 3D point
// projected onto our plane
if (_isArcSeg)
{
Point3d lastVertex = _pline.GetPoint3dAt(_pline.NumberOfVertices - 2);
Vector3d refDir;
if (_pline.NumberOfVertices < 3)
{
refDir = new Vector3d(1.0, 1.0, 0.0);
}
else
{
// Check bulge to see if last segment was an arc or a line
if (_pline.GetBulgeAt(_pline.NumberOfVertices - 3) != 0)
{
CircularArc3d arcSegment = _pline.GetArcSegmentAt(_pline.NumberOfVertices - 3);
Line3d tangent = arcSegment.GetTangent(lastVertex);
// Reference direction is the invert of the arc tangent
// at last vertex
refDir = tangent.Direction.MultiplyBy(-1.0);
}
else
{
Point3d pt = _pline.GetPoint3dAt(_pline.NumberOfVertices - 3);
refDir = new Vector3d(lastVertex.X - pt.X, lastVertex.Y - pt.Y, lastVertex.Z - pt.Z);
}
}
double angle = Class1.JigUtils.ComputeAngle(lastVertex, _tempPoint, refDir, _ucs);
// Bulge is defined as tan of one fourth of included angle
// Need to double the angle since it represents the included
// angle of the arc
// So formula is: bulge = Tan(angle * 2 * 0.25)
double bulge = Math.Tan(angle * 0.5);
_pline.SetBulgeAt(_pline.NumberOfVertices - 2, bulge);
}
else
{
// Line mode. Need to remove last bulge if there was one
if (_pline.NumberOfVertices > 1)
{
_pline.SetBulgeAt(_pline.NumberOfVertices - 2, 0);
}
}
_pline.SetPointAt(_pline.NumberOfVertices - 1, _tempPoint.Convert2d(_plane));
if (_pline.NumberOfVertices == 3)
{
_pline.Closed = true;
ObjectIdCollection ids = new ObjectIdCollection();
ids.Add(_pline.ObjectId);
// Add the hatch loops and complete the hatch
_hat.Associative = true;
_hat.AppendLoop(HatchLoopTypes.Default, ids);
}
if (!wd.RegenAbort)
{
wd.Geometry.Draw(_pline);
if (_pline.NumberOfVertices > 2)
{
_hat.EvaluateHatch(true);
if (!wd.RegenAbort)
{
wd.Geometry.Draw(_hat);
}
}
}
return(true);
}
protected override bool Update()
{
// Update the dummy vertex to be our 3D point
// projected onto our plane
Polyline pl = Entity as Polyline;
if (_isArcSeg)
{
Point3d lastVertex =
pl.GetPoint3dAt(pl.NumberOfVertices - 2);
Vector3d refDir;
if (pl.NumberOfVertices < 3)
{
refDir = new Vector3d(1.0, 1.0, 0.0);
}
else
{
// Check bulge to see if last segment was an arc or a line
if (pl.GetBulgeAt(pl.NumberOfVertices - 3) != 0)
{
CircularArc3d arcSegment =
pl.GetArcSegmentAt(pl.NumberOfVertices - 3);
Line3d tangent = arcSegment.GetTangent(lastVertex);
// Reference direction is the invert of the arc tangent
// at last vertex
refDir = tangent.Direction.MultiplyBy(-1.0);
}
else
{
Point3d pt =
pl.GetPoint3dAt(pl.NumberOfVertices - 3);
refDir =
new Vector3d(
lastVertex.X - pt.X,
lastVertex.Y - pt.Y,
lastVertex.Z - pt.Z
);
}
}
double angle =
JigUtils.ComputeAngle(
lastVertex, _tempPoint, refDir, _ucs
);
// Bulge is defined as tan of one fourth of included angle
// Need to double the angle since it represents the included
// angle of the arc
// So formula is: bulge = Tan(angle * 2 * 0.25)
double bulge = Math.tan(angle * 0.5);
pl.SetBulgeAt(pl.NumberOfVertices - 2, bulge);
}
else
{
// Line mode. Need to remove last bulge if there was one
if (pl.NumberOfVertices > 1)
{
pl.SetBulgeAt(pl.NumberOfVertices - 2, 0);
}
}
pl.SetPointAt(
pl.NumberOfVertices - 1, _tempPoint.Convert2d(_plane)
);
return(true);
}