/// <summary>
/// serialize coord-transform-chain to specific stream
/// </summary>
/// <param name="coordTx"></param>
/// <param name="writer"></param>
public static void Write(ICoordTransformer coordTx, System.IO.BinaryWriter writer)
{
//write transformation matrix to binary stream
CoordTransformerKind txKind = coordTx.Kind;
switch (txKind)
{
case CoordTransformerKind.Unknown:
default:
throw new System.NotSupportedException();
case CoordTransformerKind.Affine3x2:
{
Affine aff = (Affine)coordTx;
writer.Write((ushort)txKind); //type
AffineMat affMat = aff.GetInternalMat();
//write elements
writer.Write(affMat.sx); writer.Write(affMat.shy);
writer.Write(affMat.shx); writer.Write(affMat.sy);
writer.Write(affMat.tx); writer.Write(affMat.ty);
}
break;
case CoordTransformerKind.Bilinear:
{
Bilinear binTx = (Bilinear)coordTx;
writer.Write((ushort)txKind);
//write elements
BilinearMat binMat = binTx.GetInternalElements();
writer.Write(binMat.rc00); writer.Write(binMat.rc01);
writer.Write(binMat.rc10); writer.Write(binMat.rc11);
writer.Write(binMat.rc20); writer.Write(binMat.rc21);
writer.Write(binMat.rc30); writer.Write(binMat.rc31);
}
break;
case CoordTransformerKind.Perspective:
{
Perspective perTx = (Perspective)coordTx;
writer.Write((ushort)txKind);
PerspectiveMat perMat = perTx.GetInternalElements();
writer.Write(perMat.sx); writer.Write(perMat.shx); writer.Write(perMat.w0);
writer.Write(perMat.shy); writer.Write(perMat.sy); writer.Write(perMat.w1);
writer.Write(perMat.tx); writer.Write(perMat.ty); writer.Write(perMat.w2);
//sx, shy, w0,
//shx, sy, w1,
//tx, ty, w2;
}
break;
case CoordTransformerKind.TransformChain:
{
CoordTransformationChain chainTx = (CoordTransformationChain)coordTx;
writer.Write((ushort)txKind);
//*** left, right
Write(chainTx.Left, writer);
Write(chainTx.Right, writer);
}
break;
}
}