public void MouseMove(MouseEventArgs e)
{
if (mouseDownPosition == null)
{
return;
}
var mousePosition = new Vector2(e.X, e.Y);
var activeRotationQuaternion =
GetRotationForMove(rotationSphereRadius, mouseDownPosition.Value, mousePosition);
if (activeRotationQuaternion != Quaterniond.Identity)
{
mouseDownPosition = mousePosition;
Camera.RotationMatrix = Camera.RotationMatrix * ViewerMath.CreateRotation(activeRotationQuaternion);
Camera.OnTransformChanged();
}
}
private static void ParseFileContents(Stream stlStream, ref TriangleMesh triangleMesh)
{
Thread.CurrentThread.CurrentCulture = CultureInfo.InvariantCulture;
if (stlStream == null)
{
return;
}
var bytesInFile = stlStream.Length;
if (bytesInFile <= 80)
{
return;
}
var first160Bytes = new byte[160];
stlStream.Read(first160Bytes, 0, 160);
byte[] byteOrderMark = { 0xEF, 0xBB, 0xBF };
var startOfString = 0;
if (first160Bytes[0] == byteOrderMark[0] && first160Bytes[0] == byteOrderMark[0] && first160Bytes[0] == byteOrderMark[0])
{
startOfString = 3;
}
var first160BytesOfStlFile = System.Text.Encoding.UTF8.GetString(first160Bytes, startOfString, first160Bytes.Length - startOfString);
if (first160BytesOfStlFile.StartsWith("solid") && first160BytesOfStlFile.Contains("facet"))
{
stlStream.Position = 0;
var stlReader = new StreamReader(stlStream);
var vectorIndex = 0;
var normal = Vector3d.Zero;
var vector0 = Vector3d.Zero;
var vector1 = Vector3d.Zero;
var vector2 = Vector3d.Zero;
var line = stlReader.ReadLine();
while (line != null)
{
line = line.Trim();
if (line.StartsWith("facet normal"))
{
normal = Convert(line, "facet normal");
}
if (line.StartsWith("vertex"))
{
vectorIndex++;
switch (vectorIndex)
{
case 1:
vector0 = Convert(line, "vertex");
break;
case 2:
vector1 = Convert(line, "vertex");
break;
case 3:
vector2 = Convert(line, "vertex");
if (!ViewerMath.Collinear(vector0, vector1, vector2))
{
triangleMesh.AddTriangle(vector0, vector1, vector2, normal);
}
vectorIndex = 0;
break;
}
}
line = stlReader.ReadLine();
}
}
else
{
// load it as a binary stl
// skip the first 80 bytes
// read in the number of triangles
stlStream.Position = 0;
var br = new BinaryReader(stlStream);
var fileContents = br.ReadBytes((int)stlStream.Length);
var currentPosition = 80;
var numTriangles = BitConverter.ToUInt32(fileContents, currentPosition);
long bytesForNormals = numTriangles * 3 * 4;
long bytesForVertices = numTriangles * 3 * 4 * 3;
long bytesForAttributs = numTriangles * 2;
currentPosition += 4;
var numBytesRequiredForVertexData = currentPosition + bytesForNormals + bytesForVertices + bytesForAttributs;
if (fileContents.Length < numBytesRequiredForVertexData || numTriangles < 4)
{
stlStream.Close();
}
var vector = new Vector3d[4];
for (var i = 0; i < numTriangles; i++)
{
for (var j = 0; j < 4; j++)
{
vector[j] = new Vector3d(
BitConverter.ToSingle(fileContents, currentPosition + 0 * 4),
BitConverter.ToSingle(fileContents, currentPosition + 1 * 4),
BitConverter.ToSingle(fileContents, currentPosition + 2 * 4));
currentPosition += 3 * 4;
}
currentPosition += 2; // skip the attribute
if (!ViewerMath.Collinear(vector[1], vector[2], vector[3]))
{
triangleMesh.AddTriangle(vector[1], vector[2], vector[3], vector[0]);
}
}
}
stlStream.Close();
}