/// <summary>
/// Read a file that specifies each of the animation loops.
/// </summary>
/// <param name="filename">The file specifying the sprite.</param>
/// <returns>A sprite, or null if there was a problem reading the file.</returns>
public static AnimatedSprite SpriteFromFile(string filename, GraphicsDevice gDev)
{
XmlReader reader;
//FileStream inFile;
//try
//{
//inFile = new FileStream(filename, FileMode.Open);
//}
//catch (Exception)
//{
// return null;
//}
//reader = XmlReader.Create(inFile);
reader = XmlReader.Create(filename);
AnimatedSprite ret = null;
string tempName = null;
int tempRidx = 0;
List<AnimationLoop> loopList = null;
List<SpriteFrame> frames = null;
while (reader.Read())
{
switch (reader.NodeType)
{
case XmlNodeType.Element:
// Sprite should be the first elment encountered
if (reader.Name.Equals("sprite", StringComparison.OrdinalIgnoreCase))
{
loopList = new List<AnimationLoop>();
}
// Next is loop
if (reader.Name.Equals("loop", StringComparison.OrdinalIgnoreCase))
{
if (loopList == null)
{
throw new XmlException("Improperly formatted sprite file : "+filename);
}
frames = new List<SpriteFrame>();
// Attempt to read the name
if (reader.MoveToAttribute("name"))
{
tempName = reader.Value;
}
else
{
throw new XmlException("Loop specification needs name attribute.");
}
// Attempt to read the return index
if (reader.MoveToAttribute("retidx"))
{
tempRidx = int.Parse(reader.Value);
}
else
{
throw new XmlException("Loop specification needs retidx attribute.");
}
}
// Last is frame
if (reader.Name.Equals("frame", StringComparison.OrdinalIgnoreCase))
{
if (frames == null)
{
throw new XmlException("Improperly formatted sprite file : "+filename);
}
Texture2D tempTex = null;
TimeSpan ts;
// Attempt to read and load the texture
if (reader.MoveToAttribute("texture"))
{
// Stream the texture
tempTex = Helper.LoadTextureStream(Path.GetDirectoryName(filename) + "\\" + reader.Value, gDev);
}
else
{
throw new XmlException("Frame specification needs texture attribute.");
}
// Attempt to read the duration
if (reader.MoveToAttribute("duration"))
{
// Get the time span
ts = TimeSpan.FromSeconds(float.Parse(reader.Value));
}
else
{
throw new XmlException("Frame specification needs duration attribute.");
}
// Construct the frame and put it on the list
frames.Add(new SpriteFrame(tempTex, ts));
}
break;
case XmlNodeType.EndElement:
// When each sprite finishes, construct a sprite based on the loops
if (reader.Name.Equals("sprite", StringComparison.OrdinalIgnoreCase))
{
ret = new AnimatedSprite(loopList.ToArray());
loopList.Clear();
// Don't need this open anymore
reader.Close();
}
// When each loop finishes, use the frame list to construct a loop and put it on the list
if (reader.Name.Equals("loop", StringComparison.OrdinalIgnoreCase))
{
loopList.Add(new AnimationLoop(tempName, frames.ToArray(), tempRidx));
tempName = null;
frames = null;
tempRidx = 0;
}
break;
}
}
return ret;
}
/// <summary>
/// Create a new sprite instance with a sprite and a default loop name.
/// </summary>
/// <param name="sourceSprite">The sprite to which this is attached.</param>
/// <param name="defaultLoop">Default animation loop for this instance.</param>
public AnimatedSpriteInstance(AnimatedSprite sourceSprite, string defaultLoop)
{
Sprite = sourceSprite;
SwitchLoop(defaultLoop);
sinceLastSwitch = TimeSpan.Zero;
}