public HashSet <string> ReadLayers()
{
var buffer = new HashSet <string>();
using (var reader = new AdvancedLineStreamReader(_filePath))
{
while (!reader.EndOfStream)
{
var result = reader.FindConsecutiveLines(
MatchSubClassMarker,
AcDbEntity
);
if (result.Success)
{
reader.FindLine(MatchLayerGroupCode);
buffer.Add(reader.ReadLine().Trim());
}
else
{
break;
}
}
}
return(buffer);
}
/// <summary>
/// Get geometries in DXF file.
/// </summary>
/// <param name="callback">An action to consume geometries as they are read from the file.</param>
/// <param name="howmany">Howmany geometries to read</param>
/// <returns>Returns a count and Extents of the geometries consumed.</returns>
public (int Count, GeometryExtents <double> Extents) BeginGetGeometries(Action <string, IMarkGeometry> callback, int howmany = int.MaxValue)
{
_count = 0;
howmany = howmany < 0 ? int.MaxValue : howmany;
var extents = GeometryExtents <double> .CreateDefaultDouble();
using (var reader = new AdvancedLineStreamReader(_filePath))
{
string layerName;
List <IMarkGeometry> geometries = null;
while (
!reader.EndOfStream &&
_count < howmany
)
{
(layerName, geometries) = ParseEntity(reader);
if (geometries != null)
{
foreach (var geometry in geometries)
{
_count += 1;
extents = GeometryExtents <double> .Combine(extents, geometry.Extents);
callback((layerName == null) ? "0" : layerName, geometry);
}
}
}
}
return(_count, extents);
}
private MarkGeometryPoint ReadPointAdvance(AdvancedLineStreamReader readerIn)
{
var result = readerIn.FindConsecutiveLines(
MatchDoubleParams,
MatchDouble
);
if (result.Success)
{
double X = double.Parse(MatchDouble.Match(result.LineB).Value);
result = readerIn.FindConsecutiveLines(
MatchDoubleParams,
MatchDouble
);
double Y = double.Parse(MatchDouble.Match(result.LineB).Value);
double Z = 0;
if (MatchDoubleParams.IsMatch(readerIn.PeekLine()))
{
result = readerIn.FindConsecutiveLines(
MatchDoubleParams,
MatchDouble
);
Z = double.Parse(MatchDouble.Match(result.LineB).Value);
}
return(new MarkGeometryPoint(X, Y, Z));
}
return(null);
}
private (string LayerName, MarkGeometryCircle Circle) ParseCircle(AdvancedLineStreamReader readerIn)
{
var(success, layerName) = ReadLayerName(readerIn, "AcDbCircle");
if (success)
{
var result1 = readerIn.FindConsecutiveLines(
"100",
"AcDbCircle"
);
if (!result1.Success)
{
return(null, null);
}
}
var centrePoint = ReadPointFast(readerIn);
// read radius 40
readerIn.ReadLine();
double radius = double.Parse(readerIn.ReadLine());
var circle = new MarkGeometryCircle(centrePoint, radius);
return(layerName, circle);
}
private (string LayerName, MarkGeometryPath Path) ParsePolyline(AdvancedLineStreamReader readerIn)
{
var(success, layerName) = ReadLayerName(readerIn, MatchPolylineEntity);
if (success)
{
var result = readerIn.FindConsecutiveLines(
MatchSubClassMarker,
MatchPolylineEntity
);
if (!result.Success)
{
return(null, null);
}
}
// read number of vertices 90
var line = readerIn.ReadLine();
int numberOfVertices = int.Parse(readerIn.ReadLine());
var points = new List <MarkGeometryPoint>(numberOfVertices);
for (int i = 0; i < numberOfVertices; i++)
{
points.Add(ReadPointFast2D(readerIn));
}
return(layerName, new MarkGeometryPath(points.ToArray()));
}
public (string LayerName, List <IMarkGeometry> Entity) ParseEntity(AdvancedLineStreamReader readerIn)
{
var result = readerIn.FindConsecutiveLines(
MatchEntityGroupCode,
SupportedEntities
);
if (!result.Success)
{
return(null, null);
}
switch (result.LineB.Trim())
{
case "POINT":
var pData = ParsePoint(readerIn);
return(pData.LayerName, new List <IMarkGeometry>()
{
pData.Point
});
case "LINE":
var lData = ParseLine(readerIn);
return(lData.LayerName, new List <IMarkGeometry>()
{
lData.Line
});
case "CIRCLE":
var cData = ParseCircle(readerIn);
return(cData.LayerName, new List <IMarkGeometry>()
{
cData.Circle
});
case "ARC":
var aData = ParseArc(readerIn);
return(aData.LayerName, new List <IMarkGeometry>()
{
aData.Arc
});
case "LWPOLYLINE":
return(ParseLWPolyline(readerIn));
case "SPLINE":
var sData = ParseSpline(readerIn);
return(sData.LayerName, new List <IMarkGeometry>()
{
sData.Spline
});
}
return(null, null);
}
private (string LayerName, MarkGeometrySpline Spline) ParseSpline(AdvancedLineStreamReader readerIn)
{
var(success, layerName) = ReadLayerName(readerIn, MatchSplineEntity);
if (success)
{
var result1 = readerIn.FindConsecutiveLines(
MatchSubClassMarker,
MatchSplineEntity
);
if (!result1.Success)
{
return(null, null);
}
}
// read spline flag
int flag = ReadInteger(readerIn, "70");
// read degree of spline curve
int degree = ReadInteger(readerIn, "71");
// read number of knots
int nKnots = ReadInteger(readerIn, "72");
// read number of control points
int nControlPoints = ReadInteger(readerIn, "73");
// read number of fit points
int nFitPoints = ReadInteger(readerIn, "74");
var knots = new List <double>(nKnots);
for (int i = 0; i < nKnots; i++)
{
knots.Add(ReadDouble(readerIn, "40"));
}
var controlPoints = new List <MarkGeometryPoint>(nControlPoints);
for (int i = 0; i < nControlPoints; i++)
{
controlPoints.Add(ReadPointFast(readerIn));
}
var fitPoints = new List <MarkGeometryPoint>(nFitPoints);
for (int i = 0; i < nFitPoints; i++)
{
fitPoints.Add(ReadPointFast(readerIn));
}
return(layerName, new MarkGeometrySpline(flag, degree, knots, controlPoints, fitPoints));
}
private MarkGeometryPoint ReadPointFast2D(AdvancedLineStreamReader readerIn)
{
// read doble params 10, 11, etc
readerIn.FindLine(MatchDoubleParams);
double X = double.Parse(readerIn.ReadLine());
// read doble params 20, 21, etc
readerIn.ReadLine();
double Y = double.Parse(readerIn.ReadLine());
return(new MarkGeometryPoint(X, Y));
}
private double ReadDoubleAdvanced(AdvancedLineStreamReader readerIn, string paramCode)
{
readerIn.FindLine(paramCode);
var line = readerIn.ReadLine();
if (line.Contains("e"))
{
var components = line.Split('e');
return(double.Parse(components[0]) * Math.Pow(10, double.Parse(components[1])));
}
return(double.Parse(readerIn.ReadLine()));
}
private (string LayerName, MarkGeometryArc Arc) ParseArc(AdvancedLineStreamReader readerIn)
{
var(success, layerName) = ReadLayerName(readerIn, "AcDbCircle");
if (success)
{
var result1 = readerIn.FindConsecutiveLines(
"100",
"AcDbCircle"
);
if (!result1.Success)
{
return(null, null);
}
}
MarkGeometryPoint centrePoint = ReadPointFast(readerIn);
// read radius 40
readerIn.ReadLine();
double radius = double.Parse(readerIn.ReadLine());
var result2 = readerIn.FindConsecutiveLines(
"100",
"AcDbArc"
);
if (!result2.Success)
{
return(null, null);
}
// read angle 50
readerIn.ReadLine();
var startAngle = double.Parse(readerIn.ReadLine());
// read angle 60
readerIn.ReadLine();
var endAngle = double.Parse(readerIn.ReadLine());
var arc = new MarkGeometryArc(
centrePoint,
radius, // convert angle to radians
GeometricArithmeticModule.ToRadians(startAngle),
GeometricArithmeticModule.ToRadians(endAngle)
);
return(layerName, arc);
}
private (bool Success, string) ReadLayerName(AdvancedLineStreamReader readerIn, Regex terminationRegexIn)
{
var result = readerIn.FindConsecutiveLines(
"100",
"AcDbEntity"
);
if (!result.Success)
{
return(false, "0");
}
var result2 = readerIn.FindLineUntil(
new Regex(@"^\s*8$"),
terminationRegexIn
);
return(result2.Success, result2.Success ? readerIn.ReadLine().Trim() : "0");
}
public string ReadVersion()
{
using (var reader = new AdvancedLineStreamReader(_filePath))
{
var result = reader.FindConsecutiveLines(
MatchVersionGroupCode,
AcadVersionMarker
);
if (result.Success)
{
// skip sub group code
reader.ReadLine();
return(reader.ReadLine().Trim());
}
return(null);
}
}
private (string LayerName, MarkGeometryPoint Point) ParsePoint(AdvancedLineStreamReader readerIn)
{
var(success, layerName) = ReadLayerName(readerIn, "AcDbPoint");
if (success)
{
var result1 = readerIn.FindConsecutiveLines(
"100",
"AcDbPoint"
);
if (!result1.Success)
{
return(null, null);
}
}
return(layerName, ReadPointFast(readerIn));
}
private MarkGeometryPoint ReadPointFast(AdvancedLineStreamReader readerIn)
{
// read doble params 10, 11, etc
readerIn.FindLine(MatchDoubleParams);
double X = double.Parse(readerIn.ReadLine());
// read doble params 20, 21, etc
readerIn.ReadLine();
double Y = double.Parse(readerIn.ReadLine());
double Z = 0;
if (MatchDoubleLastParams.IsMatch(readerIn.PeekLine()))
{
// read doble params 30, 31, etc
readerIn.ReadLine();
Z = double.Parse(readerIn.ReadLine());
}
return(new MarkGeometryPoint(X, Y, Z));
}
private (string LayerName, MarkGeometryLine Line) ParseLine(AdvancedLineStreamReader readerIn)
{
var(success, layerName) = ReadLayerName(readerIn, "AcDbLine");
if (success)
{
var result = readerIn.FindConsecutiveLines(
"100",
"AcDbLine"
);
if (!result.Success)
{
return(null, null);
}
}
var line = new MarkGeometryLine(
ReadPointFast(readerIn),
ReadPointFast(readerIn)
);
return(layerName, line);
}
private int ReadInteger(AdvancedLineStreamReader readerIn, string paramCode)
{
readerIn.FindLine(paramCode);
return(int.Parse(readerIn.ReadLine()));
}
private double ReadDouble(AdvancedLineStreamReader readerIn, string paramCode)
{
readerIn.FindLine(paramCode);
return(double.Parse(readerIn.ReadLine()));
}
private (string LayerName, List <IMarkGeometry> Path) ParseLWPolyline(AdvancedLineStreamReader readerIn)
{
var(success, layerName) = ReadLayerName(readerIn, MatchLWPolylineEntity);
if (success)
{
var result1 = readerIn.FindConsecutiveLines(
MatchSubClassMarker,
MatchLWPolylineEntity
);
if (!result1.Success)
{
return(null, null);
}
}
readerIn.ReadLine(); // consume number of vertices 90
int numberOfVertices = int.Parse(readerIn.ReadLine());
int flag = ReadInteger(readerIn, "70");
var bulges = new List <double>(numberOfVertices);
var points = new List <MarkGeometryPoint>(numberOfVertices - 1);
for (int i = 0; i < numberOfVertices; i++)
{
points.Add(ReadPointFast2D(readerIn));
bulges.Add((readerIn.PeekLine().Trim() == "42") ? ReadDouble(readerIn, "42") : 0d);
}
if (points.Count > 0 && flag == 1) // i.e. is closed
{
points.Add(points[0]);
}
var buffer = new List <IMarkGeometry>();
var path = new MarkGeometryPath();
for (int i = 0; i < points.Count - 1; i++)
{
var p1 = points[i];
var p2 = points[i + 1];
var bulge = bulges[i];
if (Math.Abs(bulge) <= double.Epsilon)
{
path.Add(p1, true);
path.Add(p2, true);
}
else
{
if (path.Points.Count > 0)
{
path.Update(); // force path to re-compute it's properties
buffer.Add(path);
path = new MarkGeometryPath();
}
buffer.Add(new MarkGeometryArc(p1, p2, bulge));
}
}
if (path.Points.Count > 0)
{
path.Update(); // force path to re-compute it's properties
buffer.Add(path);
}
return(layerName, buffer);
}
