/// <summary>
/// Initializes a new instance of the <c>HatchBoundaryPath.Polyline</c> class.
/// </summary>
/// <param name="entity"><see cref="EntityObject">Entity</see> that represents the edge.</param>
public Polyline(EntityObject entity)
: base(EdgeType.Polyline)
{
if (entity == null)
{
throw new ArgumentNullException(nameof(entity));
}
if (entity.Type == EntityType.Polyline2D)
{
Entities.Polyline2D poly = (Entities.Polyline2D)entity;
this.IsClosed = poly.IsClosed;
this.Vertexes = new Vector3[poly.Vertexes.Count];
for (int i = 0; i < poly.Vertexes.Count; i++)
{
this.Vertexes[i] = new Vector3(poly.Vertexes[i].Position.X, poly.Vertexes[i].Position.Y, poly.Vertexes[i].Bulge);
}
}
else if (entity.Type == EntityType.Polyline3D)
{
Matrix3 trans = MathHelper.ArbitraryAxis(entity.Normal).Transpose();
Entities.Polyline3D poly = (Entities.Polyline3D)entity;
this.IsClosed = poly.IsClosed;
this.Vertexes = new Vector3[poly.Vertexes.Count];
for (int i = 0; i < poly.Vertexes.Count; i++)
{
Vector3 point = trans * poly.Vertexes[i];
this.Vertexes[i] = new Vector3(point.X, point.Y, 0.0);
}
}
else
{
throw new ArgumentException("The entity is not a Polyline2D or a Polyline3D", nameof(entity));
}
}
private void SetInternalInfo(IEnumerable <EntityObject> contour, bool clearEdges)
{
bool containsPolyline = false;
if (clearEdges)
{
this.edges.Clear();
}
foreach (EntityObject entity in contour)
{
if (containsPolyline)
{
throw new ArgumentException("Closed polylines cannot be combined with other entities to make a hatch boundary path.");
}
// it seems that AutoCad does not have problems on creating loops that theoretically does not make sense,
// like, for example, an internal loop that is made of a single arc.
// so if AutoCAD is OK with that I am too, the program that make use of this information will take care of this inconsistencies
switch (entity.Type)
{
case EntityType.Arc:
this.edges.Add(Arc.ConvertFrom(entity));
break;
case EntityType.Circle:
this.edges.Add(Arc.ConvertFrom(entity));
break;
case EntityType.Ellipse:
this.edges.Add(Ellipse.ConvertFrom(entity));
break;
case EntityType.Line:
this.edges.Add(Line.ConvertFrom(entity));
break;
case EntityType.Polyline2D:
Entities.Polyline2D lwpoly = (Entities.Polyline2D)entity;
if (lwpoly.IsClosed)
{
if (this.edges.Count != 0)
{
throw new ArgumentException("Closed polylines cannot be combined with other entities to make a hatch boundary path.");
}
this.edges.Add(Polyline.ConvertFrom(entity));
this.pathType |= HatchBoundaryPathTypeFlags.Polyline;
containsPolyline = true;
}
else
{
this.SetInternalInfo(lwpoly.Explode(), false); // open polylines will always be exploded, only one polyline can be present in a path
}
break;
case EntityType.Polyline3D:
Entities.Polyline3D poly = (Entities.Polyline3D)entity;
if (poly.IsClosed)
{
if (this.edges.Count != 0)
{
throw new ArgumentException("Closed polylines cannot be combined with other entities to make a hatch boundary path.");
}
this.edges.Add(Polyline.ConvertFrom(entity));
this.pathType |= HatchBoundaryPathTypeFlags.Polyline;
containsPolyline = true;
}
else
{
this.SetInternalInfo(poly.Explode(), false); // open polylines will always be exploded, only one polyline can be present in a path
}
break;
case EntityType.Spline:
this.edges.Add(Spline.ConvertFrom(entity));
break;
default:
throw new ArgumentException(string.Format("The entity type {0} cannot be part of a hatch boundary. Only Arc, Circle, Ellipse, Line, Polyline2D, Polyline3D, and Spline entities are allowed.", entity.Type));
}
}
}
