// The combine methods take a list of TTM files/surfaces and merge them all into a
// single coherent surface
// procedure Combine(const TTMSurfaces : TOwnedObjectList); overload;
// procedure Combine(const TTMFiles : TStringList); overload;
public static bool ReadHeaderFromFile(string FileName,
out TTMHeader Header)
{
Header = TTMHeader.NewHeader();
bool result = false;
try
{
using (FileStream fs = new FileStream(FileName, FileMode.Open, FileAccess.Read, FileShare.Read))
{
using (BinaryReader reader = new BinaryReader(fs))
{
Header.Read(reader);
// Check signature
string signature = ASCIIEncoding.ASCII.GetString(Header.FileSignature).Substring(0, Consts.TTMFileIdentifier.Length);
if (Consts.TTMFileIdentifier.Equals(signature))
{
// Check file version
if (Header.FileMajorVersion == Consts.TTMMajorVersion && Header.FileMinorVersion == Consts.TTMMinorVersion)
result = true;
}
}
}
}
catch
{
result = false;
}
return result;
}
public void Write(BinaryWriter writer, TTMHeader header)
{
for (int i = 0; i < Count; i++)
{
this[i].Write(writer, header);
}
}
public void Read(BinaryReader reader, TTMHeader header,
TriVertices vertices, TTMTriangles triangles, int TriNumber)
{
for (int i = 0; i < 3; i++)
{
int VertIndex = Utilities.ReadInteger(reader, header.VertexNumberSize);
Vertices[i] = (VertIndex <1 || VertIndex> vertices.Count) ? null : vertices[VertIndex - 1];
//{$ifdef LoadTTMIndices}
//VertexIndices[i] := VertexIndex;
//{$endif}
}
for (int i = 0; i < 3; i++)
{
int NeighbourIndex = Utilities.ReadInteger(reader, header.TriangleNumberSize);
Neighbours[i] = (NeighbourIndex <1 || NeighbourIndex> triangles.Count) ? null : triangles[NeighbourIndex - 1];
//{$ifdef LoadTTMIndices}
//NeighbourIndices[i] := NeighbourIndex;
//{$endif}
}
}
public void Write(BinaryWriter writer, TTMHeader header)
{
foreach (TTMVertex vertex in this)
{
vertex.Write(writer, header);
}
}
// {$ifdef LoadTTMIndices}
// TriangleIndices: array of Integer;
// {$endif
public void Write(BinaryWriter writer, TTMHeader header)
{
// Assume triangles have been numbered
for (int i = 0; i < Count; i++)
{
Utilities.WriteInteger(writer, this[i].Tag, header.TriangleNumberSize);
}
}
public void Write(BinaryWriter writer, TTMHeader header)
{
NumberTriangles();
foreach (TTMTriangle triangle in this)
{
triangle.Write(writer, header);
}
}
public void Read(BinaryReader reader, TTMHeader header, Triangles triangles)
{
Capacity = header.NumberOfStartPoints;
for (int i = 0; i < header.NumberOfStartPoints; i++)
{
long RecPos = reader.BaseStream.Position;
TTMStartPoint Pt = new TTMStartPoint(0, 0, null);
Add(Pt);
Pt.Read(reader, header, triangles);
reader.BaseStream.Position = RecPos + header.StartPointRecordSize;
}
}
public void Read(BinaryReader reader, TTMHeader header, Triangles triangles)
{
FY = Utilities.ReadFloat(reader, header.VertexCoordinateSize) + header.NorthingOffsetValue;
FX = Utilities.ReadFloat(reader, header.VertexCoordinateSize) + header.EastingOffsetValue;
int TriIndex = Utilities.ReadInteger(reader, header.TriangleNumberSize);
FTriangle = (TriIndex > 0) && (TriIndex <= triangles.Count) ? triangles[TriIndex - 1] : null;
//{$ifdef LoadTTMIndices}
//TriangleIndex:= TriIndex;
//{$endif}
}
// {$ifdef LoadTTMIndices}
// VertexIndices,
// NeighbourIndices: array[TTriangleSide] of Integer;
// {$endif}
public void Write(BinaryWriter writer, TTMHeader header)
{
for (int i = 0; i < 3; i++)
{
Utilities.WriteInteger(writer, Vertices[i].Tag, header.VertexNumberSize);
}
for (int i = 0; i < 3; i++)
{
int NeighbourIndex = Neighbours[i] == null ? Consts.NoNeighbour : Neighbours[i].Tag;
Utilities.WriteInteger(writer, NeighbourIndex, header.TriangleNumberSize);
}
}
public void Read(BinaryReader reader, TTMHeader header)
{
Capacity = header.NumberOfVertices;
for (int i = 0; i < header.NumberOfVertices; i++)
{
long RecPos = reader.BaseStream.Position;
TTMVertex Vertex = new TTMVertex(0, 0, 0);
Add(Vertex);
Vertex.Read(reader, header);
reader.BaseStream.Position = RecPos + header.VertexRecordSize;
}
NumberVertices();
}
public void Read(BinaryReader reader, TTMHeader header, TriVertices vertices)
{
Capacity = header.NumberOfTriangles;
// Create objects first as we need neighbour triangles to exist
for (int i = 0; i < header.NumberOfTriangles; i++)
{
Add(new TTMTriangle(null, null, null));
}
NumberTriangles();
for (int i = 0; i < Count; i++)
{
long RecPos = reader.BaseStream.Position;
(this[i] as TTMTriangle).Read(reader, header, vertices, this, i + 1);
reader.BaseStream.Position = RecPos + header.TriangleRecordSize;
}
}
public void Read(BinaryReader reader, TTMHeader header, Triangles triangles)
{
//{$ifdef LoadTTMIndices}
//SetLength(TriangleIndices, Header.NumberOfEdgeRecords);
//{$endif}
Capacity = header.NumberOfEdgeRecords;
for (int i = 0; i < header.NumberOfEdgeRecords; i++)
{
long RecPos = reader.BaseStream.Position;
int TriangleIndex = Utilities.ReadInteger(reader, header.TriangleNumberSize);
Add(TriangleIndex <1 || TriangleIndex> triangles.Count ? null : triangles[TriangleIndex - 1] as TTMTriangle);
//{$ifdef LoadTTMIndices}
//TriangleIndices[i] = TriangleIndex;
//{$endif}
reader.BaseStream.Position = RecPos + header.EdgeRecordSize;
}
}
// procedure RemoveDuplicateTriangles;
public static bool IsTTMFile(string FileName, out string ErrorMsg)
{
ErrorMsg = "Error reading header";
try
{
TTMHeader Header = TTMHeader.NewHeader();
using (FileStream fs = new FileStream(FileName, FileMode.Open, FileAccess.Read, FileShare.Read))
{
using (BinaryReader reader = new BinaryReader(fs))
{
Header.Read(reader);
// Check signature
string signature = ASCIIEncoding.ASCII.GetString(Header.FileSignature).Substring(0, Consts.TTMFileIdentifier.Length);
if (!Consts.TTMFileIdentifier.Equals(signature))
{
ErrorMsg = "File is not a Trimble TIN Model.";
return false;
}
// Check file version
if (Header.FileMajorVersion != Consts.TTMMajorVersion || Header.FileMinorVersion != Consts.TTMMinorVersion)
{
ErrorMsg = $"TTM.IsTTMFile(): Unable to read this version {Header.FileMajorVersion}: {Header.FileMinorVersion} of Trimble TIN Model file. Expected version: { Consts.TTMMajorVersion}: {Consts.TTMMinorVersion}";
return false;
}
return true;
}
}
}
catch (Exception E)
{
ErrorMsg = ErrorMsg + "\n" + E.Message;
return false;
}
}
public void Read(BinaryReader reader, TTMHeader header)
{
Y = Utilities.ReadFloat(reader, header.VertexCoordinateSize) + header.NorthingOffsetValue;
X = Utilities.ReadFloat(reader, header.VertexCoordinateSize) + header.EastingOffsetValue;
Z = Utilities.ReadFloat(reader, header.VertexValueSize);
}
public void Write(BinaryWriter writer, TTMHeader header)
{
Utilities.WriteFloat(writer, Y - header.NorthingOffsetValue, header.VertexCoordinateSize);
Utilities.WriteFloat(writer, X - header.EastingOffsetValue, header.VertexCoordinateSize);
Utilities.WriteFloat(writer, Z, header.VertexValueSize);
}
public void Read(BinaryReader reader)
{
string LoadErrMsg = "";
Loading = true;
try
{
try
{
LoadErrMsg = "Error reading header";
Header = TTMHeader.NewHeader();
Header.Read(reader);
var identifier = Encoding.ASCII.GetString(Header.FileSignature);
if (identifier != Consts.TTMFileIdentifier)
{
throw new TTMFileReadException("File is not a Trimble TIN Model.");
}
// Check file version
if (Header.FileMajorVersion != Consts.TTMMajorVersion
|| Header.FileMinorVersion != Consts.TTMMinorVersion)
{
throw new TTMFileReadException($"TTM.Read(): Unable to read this version {Header.FileMajorVersion}: {Header.FileMinorVersion} of Trimble TIN Model file. Expected version: { Consts.TTMMajorVersion}: {Consts.TTMMinorVersion}");
}
Clear();
ModelName = ASCIIEncoding.ASCII.GetString(Header.DTMModelInternalName).TrimEnd(new []{'\0'});
LoadErrMsg = "Error reading vertices";
reader.BaseStream.Position = Header.StartOffsetOfVertices;
(Vertices as TTMVertices).Read(reader, Header);
LoadErrMsg = "Error reading triangles";
reader.BaseStream.Position = Header.StartOffsetOfTriangles;
(Triangles as TTMTriangles).Read(reader, Header, Vertices);
LoadErrMsg = "Error reading edges";
reader.BaseStream.Position = Header.StartOffsetOfEdgeList;
Edges.Read(reader, Header, Triangles as TTMTriangles);
LoadErrMsg = "Error reading start points";
reader.BaseStream.Position = Header.StartOffsetOfStartPoints;
StartPoints.Read(reader, Header, Triangles);
}
catch (TTMFileReadException)
{
Clear();
throw; // pass it on
}
catch (Exception E)
{
Clear();
throw new TTMFileReadException($"Exception at TTM loading phase {LoadErrMsg}", E);
}
}
finally
{
Loading = false;
}
}
public void Write(BinaryWriter writer, TTMHeader header)
{
Utilities.WriteFloat(writer, Y - header.NorthingOffsetValue, header.VertexCoordinateSize);
Utilities.WriteFloat(writer, X - header.EastingOffsetValue, header.VertexCoordinateSize);
Utilities.WriteInteger(writer, Triangle.Tag, header.TriangleNumberSize);
}
