static StrokeCollectionSerializer()
{
TransformDescriptor transformDescriptor = new TransformDescriptor();
transformDescriptor.Transform[0] = 1.0f;
transformDescriptor.Tag = KnownTagCache.KnownTagIndex.TransformIsotropicScale;
transformDescriptor.Size = 1;
StrokeCollectionSerializer.IdentityTransformDescriptor = transformDescriptor;
}
/// <summary>
/// Creates a Matrix Information structure based on the transform descriptor
/// </summary>
/// <param name="tdrd"></param>
/// <returns></returns>
private Matrix LoadTransform(TransformDescriptor tdrd)
{
double M00 = 0.0f, M01 = 0.0f, M10 = 0.0f, M11 = 0.0f, M20 = 0.0f, M21 = 0.0f;
if (KnownTagCache.KnownTagIndex.TransformIsotropicScale == tdrd.Tag)
{
M00 = M11 = tdrd.Transform[0];
}
else if (KnownTagCache.KnownTagIndex.TransformRotate == tdrd.Tag)
{
double dAngle = (tdrd.Transform[0] / 100) * (Math.PI / 180);
M00 = M11 = Math.Cos(dAngle);
M01 = Math.Sin(dAngle);
if (M01 == 0.0f && M11 == 1.0f)
{
//special case for 0 degree rotate transforms
//this is identity
M10 = 0.0f;
}
else
{
M10 = -M11;
}
}
else if (KnownTagCache.KnownTagIndex.TransformAnisotropicScale == tdrd.Tag)
{
M00 = tdrd.Transform[0];
M11 = tdrd.Transform[1];
}
else if (KnownTagCache.KnownTagIndex.TransformTranslate == tdrd.Tag)
{
M20 = tdrd.Transform[0];
M21 = tdrd.Transform[1];
}
else if (KnownTagCache.KnownTagIndex.TransformScaleAndTranslate == tdrd.Tag)
{
M00 = tdrd.Transform[0];
M11 = tdrd.Transform[1];
M20 = tdrd.Transform[2];
M21 = tdrd.Transform[3];
}
else // TAG_TRANSFORM
{
M00 = tdrd.Transform[0];
M01 = tdrd.Transform[1];
M10 = tdrd.Transform[2];
M11 = tdrd.Transform[3];
M20 = tdrd.Transform[4];
M21 = tdrd.Transform[5];
}
return new Matrix(M00, M01, M10, M11, M20, M21);
}
/// <summary>
/// Multibyte Encode if necessary a Transform Descriptor into the stream
/// </summary>
/// <param name="strm"></param>
/// <param name="xform"></param>
/// <param name="useDoubles"></param>
/// <returns></returns>
private uint EncodeTransformDescriptor(Stream strm, TransformDescriptor xform, bool useDoubles)
{
uint cbData = 0;
// First encode the tag
cbData = SerializationHelper.Encode(strm, (uint)xform.Tag);
// Encode specially if transform denotes rotation
if (KnownTagCache.KnownTagIndex.TransformRotate == xform.Tag)
{
uint angle = (uint)(xform.Transform[0] + 0.5f);
cbData += SerializationHelper.Encode(strm, angle);
}
else
{
// samgeo - Presharp issue
// Presharp gives a warning when local IDisposable variables are not closed
// in this case, we can't call Dispose since it will also close the underlying stream
// which still needs to be written to
#pragma warning disable 1634, 1691
#pragma warning disable 6518
BinaryWriter bw = new BinaryWriter(strm);
for (int i = 0; i < xform.Size; i++)
{
// note that the binary writer changes serialization
// lengths depending on the Write parameter cast
if (useDoubles)
{
bw.Write(xform.Transform[i]);
cbData += Native.SizeOfDouble;
}
else
{
bw.Write((float)xform.Transform[i]);
cbData += Native.SizeOfFloat;
}
}
#pragma warning restore 6518
#pragma warning restore 1634, 1691
}
return cbData;
}
/// <summary>
/// Reads and Decodes a Transfrom Descriptor Block from the stream. For information on how it is stored in the stream,
/// please refer to the spec.
/// </summary>
/// <param name="strm"></param>
/// <param name="tag"></param>
/// <param name="cbSize"></param>
/// <param name="useDoubles"></param>
/// <param name="xform"></param>
/// <returns></returns>
private uint DecodeTransformBlock(Stream strm, KnownTagCache.KnownTagIndex tag, uint cbSize, bool useDoubles, out TransformDescriptor xform)
{
xform = new TransformDescriptor();
xform.Tag = tag;
uint cbRead = 0;
uint cbTotal = cbSize;
if (0 == cbSize)
return 0;
// samgeo - Presharp issue
// Presharp gives a warning when local IDisposable variables are not closed
// in this case, we can't call Dispose since it will also close the underlying stream
// which still needs to be read from
#pragma warning disable 1634, 1691
#pragma warning disable 6518
BinaryReader bw = new BinaryReader(strm);
if (KnownTagCache.KnownTagIndex.TransformRotate == tag)
{
uint angle;
cbRead = SerializationHelper.Decode(strm, out angle);
if (cbRead > cbSize)
throw new ArgumentException(ISFDebugMessage("Invalid ISF data"),"strm");
xform.Transform[0] = (double)angle;
xform.Size = 1;
}
else
{
if (tag == KnownTagCache.KnownTagIndex.TransformIsotropicScale)
{
xform.Size = 1;
}
else if (tag == KnownTagCache.KnownTagIndex.TransformAnisotropicScale || tag == KnownTagCache.KnownTagIndex.TransformTranslate)
{
xform.Size = 2;
}
else if (tag == KnownTagCache.KnownTagIndex.TransformScaleAndTranslate)
{
xform.Size = 4;
}
else
{
xform.Size = 6;
}
if (useDoubles)
{
cbRead = xform.Size * Native.SizeOfDouble;
}
else
{
cbRead = xform.Size * Native.SizeOfFloat;
}
if (cbRead > cbSize)
throw new ArgumentException(ISFDebugMessage("Invalid ISF data"),"strm");
for (int i = 0; i < xform.Size; i++)
{
if (useDoubles)
{
xform.Transform[i] = bw.ReadDouble();
}
else
{
xform.Transform[i] = (double)bw.ReadSingle();
}
}
}
return cbRead;
#pragma warning restore 6518
#pragma warning restore 1634, 1691
}