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using System;
using System.Drawing.Imaging;
using System.IO;
using System.Text;
namespace Tango.Pulse
{
/// <summary>
/// Represents a Pulse, twn file writer.
/// </summary>
public class TwnFileWriter
{
/// <summary>
/// Writes the specified TWN file.
/// </summary>
/// <param name="twnFile">The TWN file.</param>
/// <param name="output">The output.</param>
/// <exception cref="System.ArgumentOutOfRangeException">Invalid design name length.</exception>
/// <exception cref="System.NullReferenceException">
/// Thumbnail image is null.
/// or
/// Could not serialize a null embroidery file.
/// </exception>
/// <exception cref="System.ArgumentException">The embroidery format must contain exactly 3 characters.</exception>
public void Write(TwnFile twnFile, Stream output)
{
BinaryWriter writer = new BinaryWriter(output);
//Format Version (Default is 1.0).
writer.Write(twnFile.Version);
//The name of the design or other labeling information as UTF - 8 text padded with white spaces and limited to 50 bytes.
byte[] nameBytes = Encoding.UTF8.GetBytes(twnFile.Name.PadRight(50, ' '));
if (nameBytes.Length < 50)
{
throw new ArgumentOutOfRangeException("Invalid design name length.");
}
writer.Write(nameBytes, 0, 50);
//The embedded preview image size in byte length as a 32 bit unsigned integer.
if (twnFile.Thumbnail == null)
{
throw new NullReferenceException("Thumbnail image is null.");
}
byte[] thumbnailBytes = null; //For later use.
using (MemoryStream ms = new MemoryStream())
{
twnFile.Thumbnail.Save(ms, ImageFormat.Png);
writer.Write((UInt32)ms.Length);
thumbnailBytes = ms.ToArray();
}
//The total number of brush segments as a 32 bit unsigned integer.
writer.Write((UInt32)twnFile.Segments.Count);
//Number of copies. (The number 0 will be treated as 1, so the default is 0)
writer.Write((UInt32)twnFile.NumberOfCopies);
//0 - Spool per segment. (default)
//1 - Spool per copy.
//2 - Single spool for all segments.
writer.Write((byte)twnFile.SpoolingMethod);
//A unique code representing an optional media ID from Twine’s recommended media list.
writer.Write((UInt32)twnFile.MediaID);
//3 ASCII characters representing the embedded embroidery file extension (e.g dst, pes).
if (twnFile.EmbroideryFileFormat.Length != 3)
{
throw new ArgumentException("The embroidery format must contain exactly 3 characters.");
}
writer.Write(Encoding.ASCII.GetBytes(twnFile.EmbroideryFileFormat));
//The byte array length of the embedded embroidery file.
if (twnFile.EmbroideryFile == null)
{
throw new NullReferenceException("Could not serialize a null embroidery file.");
}
writer.Write((UInt32)twnFile.EmbroideryFile.Length);
//Array of bytes representing the design preview image in PNG format(transparent background).
//The size of the PNG byte array must be defined in the header. Recommended image width is 1280
//pixels while maintaining aspect ratio.
writer.Write(thumbnailBytes);
//Array of Brush Segment. The number of brush segments must be defined in the header.
foreach (var segment in twnFile.Segments)
{
//Required thread length in centimeters.
writer.Write(segment.Length);
//Number of brush stops.
writer.Write((UInt32)segment.BrushStops.Count);
//Array of brush stops.
foreach (var stop in segment.BrushStops)
{
//The RGB red component.
writer.Write(stop.R);
//The RGB green component.
writer.Write(stop.G);
//The RGB blue component.
writer.Write(stop.B);
//The Brush stop offset position within the parent brush length in percentage (0-1).
writer.Write(stop.Offset);
}
}
//Byte array representing the standard embroidery file which can be extracted and inserted into an embroidery machine.
writer.Write(twnFile.EmbroideryFile);
}
}
}
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