private HatchBoundaryPath ReadEdgeBoundaryPath(int numEdges)
{
// the information of the boundary path data always appear exactly as it is read
List<HatchBoundaryPath.Edge> entities = new List<HatchBoundaryPath.Edge>();
this.chunk.Next();
while (entities.Count < numEdges)
{
// Edge type (only if boundary is not a polyline): 1 = Line; 2 = Circular arc; 3 = Elliptic arc; 4 = Spline
HatchBoundaryPath.EdgeType type = (HatchBoundaryPath.EdgeType) this.chunk.ReadShort();
switch (type)
{
case HatchBoundaryPath.EdgeType.Line:
this.chunk.Next();
// line
double lX1 = this.chunk.ReadDouble(); // code 10
this.chunk.Next();
double lY1 = this.chunk.ReadDouble(); // code 20
this.chunk.Next();
double lX2 = this.chunk.ReadDouble(); // code 11
this.chunk.Next();
double lY2 = this.chunk.ReadDouble(); // code 21
this.chunk.Next();
HatchBoundaryPath.Line line = new HatchBoundaryPath.Line
{
Start = new Vector2(lX1, lY1),
End = new Vector2(lX2, lY2)
};
entities.Add(line);
break;
case HatchBoundaryPath.EdgeType.Arc:
this.chunk.Next();
// circular arc
double aX = this.chunk.ReadDouble(); // code 10
this.chunk.Next();
double aY = this.chunk.ReadDouble(); // code 40
this.chunk.Next();
double aR = this.chunk.ReadDouble(); // code 40
this.chunk.Next();
double aStart = this.chunk.ReadDouble(); // code 50
this.chunk.Next();
double aEnd = this.chunk.ReadDouble(); // code 51
this.chunk.Next();
bool aCCW = this.chunk.ReadShort() != 0; // code 73
this.chunk.Next();
HatchBoundaryPath.Arc arc = new HatchBoundaryPath.Arc
{
Center = new Vector2(aX, aY),
Radius = aR,
StartAngle = aStart,
EndAngle = aEnd,
IsCounterclockwise = aCCW
};
entities.Add(arc);
break;
case HatchBoundaryPath.EdgeType.Ellipse:
this.chunk.Next();
// elliptic arc
double eX = this.chunk.ReadDouble(); // code 10
this.chunk.Next();
double eY = this.chunk.ReadDouble(); // code 20
this.chunk.Next();
double eAxisX = this.chunk.ReadDouble(); // code 11
this.chunk.Next();
double eAxisY = this.chunk.ReadDouble(); // code 21
this.chunk.Next();
double eAxisRatio = this.chunk.ReadDouble(); // code 40
this.chunk.Next();
double eStart = this.chunk.ReadDouble(); // code 50
this.chunk.Next();
double eEnd = this.chunk.ReadDouble(); // code 51
this.chunk.Next();
bool eCCW = this.chunk.ReadShort() != 0; // code 73
this.chunk.Next();
HatchBoundaryPath.Ellipse ellipse = new HatchBoundaryPath.Ellipse
{
Center = new Vector2(eX, eY),
EndMajorAxis = new Vector2(eAxisX, eAxisY),
MinorRatio = eAxisRatio,
StartAngle = eStart,
EndAngle = eEnd,
IsCounterclockwise = eCCW
};
entities.Add(ellipse);
break;
case HatchBoundaryPath.EdgeType.Spline:
this.chunk.Next();
// spline
short degree = (short) this.chunk.ReadInt(); // code 94
this.chunk.Next();
bool isRational = this.chunk.ReadShort() != 0; // code 73
this.chunk.Next();
bool isPeriodic = this.chunk.ReadShort() != 0; // code 74
this.chunk.Next();
int numKnots = this.chunk.ReadInt(); // code 95
double[] knots = new double[numKnots];
this.chunk.Next();
int numControlPoints = this.chunk.ReadInt(); // code 96
Vector3[] controlPoints = new Vector3[numControlPoints];
this.chunk.Next();
for (int i = 0; i < numKnots; i++)
{
knots[i] = this.chunk.ReadDouble(); // code 40
this.chunk.Next();
}
for (int i = 0; i < numControlPoints; i++)
{
double x = this.chunk.ReadDouble(); // code 10
this.chunk.Next();
double y = this.chunk.ReadDouble(); // code 20
this.chunk.Next();
// control point weight might not be present
double w = 1.0;
if (this.chunk.Code == 42)
{
w = this.chunk.ReadDouble(); // code 42
this.chunk.Next();
}
controlPoints[i] = new Vector3(x, y, w);
}
// this information is only required for AutoCAD version 2010 and newer
// stores information about spline fit point (the spline entity does not make use of this information)
if (this.doc.DrawingVariables.AcadVer >= DxfVersion.AutoCad2010)
{
int numFitData = this.chunk.ReadInt(); // code 97
this.chunk.Next();
for (int i = 0; i < numFitData; i++)
{
//double fitX = this.chunk.ReadDouble(); // code 11
this.chunk.Next();
//double fitY = this.chunk.ReadDouble(); // code 21
this.chunk.Next();
}
// the info on start tangent might not appear
if (this.chunk.Code == 12)
{
//double startTanX = this.chunk.ReadDouble(); // code 12
this.chunk.Next();
//double startTanY = this.chunk.ReadDouble(); // code 22
this.chunk.Next();
}
// the info on end tangent might not appear
if (this.chunk.Code == 13)
{
//double endTanX = this.chunk.ReadDouble(); // code 13
this.chunk.Next();
//double endTanY = this.chunk.ReadDouble(); // code 23
this.chunk.Next();
}
}
HatchBoundaryPath.Spline spline = new HatchBoundaryPath.Spline
{
Degree = degree,
IsPeriodic = isPeriodic,
IsRational = isRational,
ControlPoints = controlPoints,
Knots = knots
};
entities.Add(spline);
break;
}
}
HatchBoundaryPath path = new HatchBoundaryPath(entities);
// read all referenced entities
Debug.Assert(this.chunk.Code == 97, "The reference count code 97 was expected.");
int numBoundaryObjects = this.chunk.ReadInt();
this.hatchContourns.Add(path, new List<string>(numBoundaryObjects));
this.chunk.Next();
for (int i = 0; i < numBoundaryObjects; i++)
{
Debug.Assert(this.chunk.Code == 330, "The reference handle code 330 was expected.");
this.hatchContourns[path].Add(this.chunk.ReadString());
this.chunk.Next();
}
return path;
}
// TODO: apply the transformation directly to edges
public void TransformBy2(Matrix3 transformation, Vector3 translation)
{
if (this.associative)
{
this.UnLinkBoundary();
}
Vector3 newNormal = transformation * this.Normal;
if (Vector3.Equals(Vector3.Zero, newNormal))
{
newNormal = this.Normal;
}
Matrix3 transOW = MathHelper.ArbitraryAxis(this.Normal);
Matrix3 transWO = MathHelper.ArbitraryAxis(newNormal).Transpose();
Vector3 position = transOW * new Vector3(0.0, 0.0, this.Elevation);
foreach (HatchBoundaryPath path in this.BoundaryPaths)
{
foreach (HatchBoundaryPath.Edge edge in path.Edges)
{
switch (edge.Type)
{
case HatchBoundaryPath.EdgeType.Arc:
break;
case HatchBoundaryPath.EdgeType.Ellipse:
break;
case HatchBoundaryPath.EdgeType.Line:
HatchBoundaryPath.Line line = (HatchBoundaryPath.Line)edge;
Vector3 start = new Vector3(line.Start.X, line.Start.Y, 0.0);
Vector3 end = new Vector3(line.End.X, line.End.Y, 0.0);
// to world coordinates
start = transOW * start + position;
end = transOW * end + position;
// transformation
start = transformation * start + translation;
end = transformation * end + translation;
Vector3 point;
point = transWO * start;
line.Start = new Vector2(point.X, point.Y);
point = transWO * end;
line.End = new Vector2(point.X, point.Y);
break;
case HatchBoundaryPath.EdgeType.Polyline:
break;
case HatchBoundaryPath.EdgeType.Spline:
break;
}
}
}
position = transformation * position + translation;
position = transWO * position;
Vector2 refAxis = Vector2.Rotate(Vector2.UnitX, this.Pattern.Angle * MathHelper.DegToRad);
refAxis = this.Pattern.Scale * refAxis;
Vector3 v = transOW * new Vector3(refAxis.X, refAxis.Y, 0.0);
v = transformation * v;
v = transWO * v;
Vector2 axis = new Vector2(v.X, v.Y);
double newAngle = Vector2.Angle(axis) * MathHelper.RadToDeg;
double newScale = axis.Modulus();
newScale = MathHelper.IsZero(newScale) ? MathHelper.Epsilon : newScale;
this.Pattern.Scale = newScale;
this.Pattern.Angle = newAngle;
this.Elevation = position.Z;
this.Normal = newNormal;
}