public static Keyframe FromSpec(string arg)
{
// No ( -> constant
if (!arg.Contains('('))
{
return(new Keyframe
{
Value = ParseValue(arg)
});
}
var regexp = new Regex(@"^(.+)\((.+)\)$");
var match = regexp.Match(arg);
if (!match.Success)
{
throw new ArgumentException("Invalid keyframe: " + arg);
}
var result = new Keyframe();
if (match.Groups[2].Value.EndsWith("%"))
{
// Parse everything up to the percentage sign as the percentage of the emitter lifespan
var val = match.Groups[2].Value;
result.PositionPercentage = int.Parse(val.Substring(0, val.Length - 1));
}
else
{
result.PositionLifespan = VariableParam.ParseFloat(match.Groups[2].Value);
}
result.Value = ParseValue(match.Groups[1].Value);
return(result);
}
/// <summary>
/// Vanilla ToEE particle systems contain keyframe values that are actually invalid: 100?200.
/// Apparently, designers tried to do random values inside of keyframes, but this actually
/// was never implemented and as such we skip it.
/// </summary>
/// <param name="value"></param>
/// <returns></returns>
private static float ParseValue(string value)
{
if (string.IsNullOrWhiteSpace(value))
{
// TODO: Warn here...
return(0);
}
var pos = value.IndexOf('?');
if (pos != -1)
{
return(VariableParam.ParseFloat(value.Substring(0, pos)));
}
return(VariableParam.ParseFloat(value));
}