/// <summary>
/// Reads a poly line from the DXF file and construct a boundary from the geometry and extended attributes
/// defining the boundary type and name
/// </summary>
/// <param name="closedPolyLinesOnly"></param>
/// <param name="atEof"></param>
/// <param name="boundary"></param>
/// <returns></returns>
public bool GetBoundaryFromPolyLineEntity(bool closedPolyLinesOnly, out bool atEof, out PolyLineBoundary boundary)
{
var loadError = false;
var polyLineIsClosed = false;
atEof = GetStartOfNextEntity(out var DXFRec);
boundary = null;
if (atEof)
{
return(false);
}
boundary = new PolyLineBoundary();
var testString = DXFRec.s.ToUpper(CultureInfo.InvariantCulture);
switch (testString)
{
// ReSharper disable once StringLiteralTypo
case "POLYLINE":
ReadPolyLine(out loadError, false, boundary, out polyLineIsClosed);
break;
// ReSharper disable once StringLiteralTypo
case "LWPOLYLINE":
ReadPolyLine(out loadError, true, boundary, out polyLineIsClosed);
break;
}
return(!loadError && (polyLineIsClosed || !closedPolyLinesOnly));
}
/* Todo: Extrusion not supported
* private bool CheckExtrusionRecord(DXFRecord rec)
* {
* // Returns True if the record is a non default extrusion record
*
* return ((rec.recType == 210) && (rec.r != 0.0)) ||
* ((rec.recType == 220) && (rec.r != 0.0)) ||
* ((rec.recType == 230) && (rec.r != 1.0));
* }
*/
/// <summary>
/// Reads the entirety of a polyline from the DXF file
/// </summary>
/// <param name="loadError"></param>
/// <param name="lwPolyLine"></param>
/// <param name="entity"></param>
/// <param name="polyLineIsClosed"></param>
public void ReadPolyLine(out bool loadError,
bool lwPolyLine,
PolyLineBoundary entity,
out bool polyLineIsClosed)
{
const double EPSILON = 0.000001;
int FetchIndex;
int NumArrayEntries;
DXFRecord rec;
XYZ lastPt = XYZ.Null, pt;
bool PaperSpace;
// Todo: Extrusion is not taken into account
// bool extruded;
long PolyLineFlags;
// double bulge;
long NVertices;
long VertexNum;
long CurveSmoothing;
// Todo extrusion not supported XYZ Extrusion;
bool PolyLineIs3D;
double DefaultPolyLineHeight;
var ExtendedAttrName = "";
var PolyLineRecords = new List <DXFRecord>();
// This function allows us to reread the first few record in the poly line.
bool GetDXFRecord(out DXFRecord record)
{
if (FetchIndex < NumArrayEntries)
{
record = PolyLineRecords[FetchIndex];
FetchIndex++;
return(true);
}
return(ReadDXFRecord(out record));
}
void LoadSimplePolyLine()
{
// Load all vertices in the poly line
var FirstPoint = true;
while ((rec.s == "VERTEX") || (lwPolyLine && (VertexNum < NVertices)))
{
// double nextBulge = 0;
var VertexFlags = 0;
var Rec10Count = 0;
pt.Z = Consts.NullDouble;
do
{
if (!GetDXFRecord(out rec))
{
return;
}
switch (rec.recType)
{
case 10:
Rec10Count++;
if (Rec10Count == 1)
{
pt.X = rec.r * DXFImportConvFactor;
}
break;
case 20:
pt.Y = rec.r * DXFImportConvFactor;
break;
case 30:
if (PolyLineIs3D)
{
pt.Z = rec.r * DXFImportConvFactor;
}
break;
// case 42:
// nextBulge = rec.r;
// break;
// case 62 : ; //SetPen (pen,rec.i);
// break;
case 70:
VertexFlags = (ushort)rec.i;
break;
}
} while (!(rec.recType == 0 || (lwPolyLine && Rec10Count == 2)));
// If we are reading in a 2D poly line, then the heights of all the
// vertices in the poly line should be set to the elevation read in from
// the 38 field in the POLY LINE entity (ie: any elevation read in for
// the vertex is discarded. This also applies to LW POLY LINE entities.
// Note: This could have been achieved by initializing
// the value of pt.z before the repeat loop, but this explicit
// behaviour is more evident as to its purpose.
if (!PolyLineIs3D)
{
pt.Z = DefaultPolyLineHeight;
}
// Todo: Extrusion is not taken into account
//if (extruded && !PolyLineIs3D)
// AdjustForExtrusion(pt.x, pt.y, pt.z, Extrusion);
if (lwPolyLine)
{
FetchIndex--; // Reprocess the last record
VertexNum++;
}
if ((VertexFlags & kSplineFrameControlPointFlag) != kSplineFrameControlPointFlag)
{
bool IsDuplicateVertex;
if (FirstPoint)
{
IsDuplicateVertex = false;
}
else
{
IsDuplicateVertex = (Math.Abs(pt.X - lastPt.X) < EPSILON) &&
(Math.Abs(pt.Y - lastPt.Y) < EPSILON) &&
(!PolyLineIs3D || (Math.Abs(pt.Z - lastPt.Z) < EPSILON));
}
// Determine if the vertex we have just read in is the same as the previous vertex.
// If it is, then don't create entities for it
if (!IsDuplicateVertex)
{
// Add the vertex to the fence
entity.Boundary.Points.Add(new FencePoint(pt.X, pt.Y));
}
// bulge = nextBulge;
if (!IsDuplicateVertex)
{
FirstPoint = false;
lastPt = pt;
}
}
}
}
void ProcessNonVertexRecord()
{
switch (rec.recType)
{
case 8:
//load := SetCurrentLayer (rec.s,pen);
break;
// 30 record is height for all vertices in a 2D poly line
case 30:
DefaultPolyLineHeight = rec.r * DXFImportConvFactor;
break;
// 38 record is height for all vertices in a lightweight poly line
case 38:
DefaultPolyLineHeight = rec.r * DXFImportConvFactor;
break;
case 62:
//SetPen (pen,rec.i);
break;
case 67:
PaperSpace = rec.i != 0;
break;
case 70:
PolyLineFlags = rec.i;
break;
case 75:
/*Curves and smooth surface type (optional; default = 0); integer codes, not bit-coded:
* 0 = No smooth surface fitted
* 5 = Quadratic B-spline surface
* 6 = Cubic B-spline surface
* 8 = Bezier surface */
CurveSmoothing = rec.i;
break;
case 90:
NVertices = rec.i;
break;
/* Todo: Extrusion not supported
* case 210:
* Extrusion.X = rec.r;
* break;
* case 220:
* Extrusion.Y = rec.r;
* break;
* case 230:
* Extrusion.Z = rec.r;
* break;
*/
case 1001:
ExtendedAttrName = rec.s.ToUpper(CultureInfo.InvariantCulture); // Registered application name (up to 31 bytes) in extended data
break;
case 1000: // ASCII string in extended attrs (up to 255 bytes)
case 1070:
if (ExtendedAttrName == "TRIMBLEBNDYTYPE")
{
entity.Type = (DXFLineWorkBoundaryType)rec.i;
}
else if (ExtendedAttrName == "TRIMBLENAME")
{
entity.Name = rec.s;
}
break;
}
}
bool IsPolyLineClosed()
{
XYZ pt_start, pt_end;
var SavedFetchIndex = FetchIndex;
// Start vertex...
pt_start.X = PolyLineRecords[FetchIndex].r * DXFImportConvFactor;
pt_start.Y = PolyLineRecords[FetchIndex + 1].r * DXFImportConvFactor;
if (PolyLineIs3D)
{
pt_start.Z = PolyLineRecords[FetchIndex + 2].r * DXFImportConvFactor;
}
else
{
pt_start.Z = Consts.NullDouble;
}
do
{
if (!GetDXFRecord(out rec))
{
return(false);
}
} while (rec.recType != 0);
// End vertex...
if (PolyLineIs3D)
{
pt_end.Z = PolyLineRecords[FetchIndex - 2].r * DXFImportConvFactor;
pt_end.Y = PolyLineRecords[FetchIndex - 3].r * DXFImportConvFactor;
pt_end.X = PolyLineRecords[FetchIndex - 4].r * DXFImportConvFactor;
}
else
{
pt_end.Y = PolyLineRecords[FetchIndex - 2].r * DXFImportConvFactor;
pt_end.X = PolyLineRecords[FetchIndex - 3].r * DXFImportConvFactor;
pt_end.Z = Consts.NullDouble;
}
FetchIndex = SavedFetchIndex;
return((Math.Abs(pt_start.X - pt_end.X) < EPSILON) &&
(Math.Abs(pt_start.Y - pt_end.Y) < EPSILON) &&
(!PolyLineIs3D || (Math.Abs(pt_start.Z - pt_end.Z) < EPSILON)));
}
loadError = true;
PaperSpace = false;
// Todo extruded = false;
// bulge = 0;
NVertices = 0;
VertexNum = 0;
PolyLineFlags = 0;
DefaultPolyLineHeight = Consts.NullDouble;
CurveSmoothing = 0;
// Todo Extrusion = DefaultExtrusion;
pt = XYZ.Null;
polyLineIsClosed = false;
//--------------------------------------------
// This is a bit grubby, but in my defense we had to handle extrusions for
// LW POLY LINE entities. In this case we have to read the entire entity looking
// for extrusion records before we use the point.
FetchIndex = 0;
do
{
if (!ReadDXFRecord(out rec))
{
return;
}
ProcessNonVertexRecord();
PolyLineRecords.Add(rec);
FetchIndex++;
} while (rec.recType != 0); // Start of next entity
polyLineIsClosed = (PolyLineFlags & kPolylineIsClosed) == kPolylineIsClosed;
PolyLineIs3D = !lwPolyLine &&
(((PolyLineFlags & kPolylineIs3D) == kPolylineIs3D) ||
((PolyLineFlags & kPolylineIsPolyfaceMesh) == kPolylineIsPolyfaceMesh));
// Todo: extruded = CheckExtrusionRecord(Extrusion);
NumArrayEntries = FetchIndex;
if (lwPolyLine)
{
_reuseRecord = true; // load_entities needs to read this record
}
//--------------------------------------------
// Read poly line header values
FetchIndex = 0; // Reprocess the records that have already been read.
do
{
if (!GetDXFRecord(out rec))
{
return;
}
ProcessNonVertexRecord();
} while (!((rec.recType == 0) || (lwPolyLine && (rec.recType == 10)))); // Start of first vertex
//--------------------------------------------
if (lwPolyLine)
{
FetchIndex--; // Reprocess the last record
}
// Check whether the poly line is closed if the internal flag indicates it is not...
polyLineIsClosed = polyLineIsClosed || (lwPolyLine && IsPolyLineClosed());
if (!PaperSpace)
{
if ((PolyLineFlags & kPolylineIsPolyfaceMesh) == kPolylineIsPolyfaceMesh)
{
// We no longer load poly face meshes as background line work...
}
else // It's a poly line of some form
{
if (!lwPolyLine &&
(CurveSmoothing == kQuadraticBSplineSmoothing) ||
(CurveSmoothing == kCubicBSplineSmoothing))
{
// Spline fit poly lines are not supported here
}
else
{
LoadSimplePolyLine();
}
}
}
else
{
// ReSharper disable once StringLiteralTypo
// Scan past SEQ END for standard 3D poly lines
if (!lwPolyLine)
{
while ((rec.recType != 0) || (rec.s != "SEQEND"))
{
if (!ReadDXFRecord(out rec))
{
return;
}
}
}
}
loadError = false;
}
