public static bool ProcessTime(ref MinMax <float> timeRange, ref bool isFade, float initialTime, float finalTime, ref List <ParticleEmitterToken> .Enumerator tokenIter)
{
// determine if this time specification is a fade directive
if (tokenIter.Current.Type == TokenType.KeywordFade)
{
// it is... the next token must be "so"
ParticleEmitterTokenizer.NextToken(ref tokenIter);
if (tokenIter.Current.Type != TokenType.KeywordSo)
{
throw new Exception("Expecting \"so\" after \"fade\".");
}
// flip the fade flag on
isFade = true;
// move to next token (so that we land on "at" for the code below)
ParticleEmitterTokenizer.NextToken(ref tokenIter);
}
else
{
isFade = false; // just to be safe
}
switch (tokenIter.Current.Type)
{
case TokenType.KeywordAt:
{
// easy, just grab the time
ParticleEmitterTokenizer.NextToken(ref tokenIter);
timeRange = ProcessNumber(ref tokenIter);
}
break;
case TokenType.KeywordInitial:
{
// use initial time that was passed in.
if (isFade)
{
throw new Exception("Cannot use \"fade so\" modifier on \"initial\" times.");
}
timeRange.Min = initialTime;
timeRange.Max = initialTime;
ParticleEmitterTokenizer.NextToken(ref tokenIter);
}
break;
case TokenType.KeywordFinal:
{
// use final time that was passed in.
timeRange.Min = finalTime;
timeRange.Max = finalTime;
ParticleEmitterTokenizer.NextToken(ref tokenIter);
}
break;
default:
throw new Exception("Expected time specifier: \"[fade so] at\", \"initial\", or \"[fade so] final\"");
}
return(true);
}
public static MinMax <float> ProcessNumber(ref List <ParticleEmitterToken> .Enumerator tokenIter)
{
MinMax <float> number = new MinMax <float>();
// the first token is either the random keyword, or it's an actual number.
switch (tokenIter.Current.Type)
{
case TokenType.KeywordRandom:
// parse random number into minmax
ParticleEmitterTokenizer.NextToken(ref tokenIter);
if (tokenIter.Current.Type != TokenType.OpenParen)
{
throw new Exception("Expecting opening paren after Random keyword.");
}
ParticleEmitterTokenizer.NextToken(ref tokenIter);
if (tokenIter.Current.Type != TokenType.RealNumber)
{
throw new Exception("Expecting first number within Random(...).");
}
number.Min = float.Parse(tokenIter.Current.StringValue, CultureInfo.InvariantCulture.NumberFormat);
ParticleEmitterTokenizer.NextToken(ref tokenIter);
if (tokenIter.Current.Type != TokenType.Comma)
{
throw new Exception("Expecting comma within Random(...).");
}
ParticleEmitterTokenizer.NextToken(ref tokenIter);
if (tokenIter.Current.Type != TokenType.RealNumber)
{
throw new Exception("Expecting second number within Random(...).");
}
number.Max = float.Parse(tokenIter.Current.StringValue, CultureInfo.InvariantCulture.NumberFormat);
ParticleEmitterTokenizer.NextToken(ref tokenIter);
if (tokenIter.Current.Type != TokenType.CloseParen)
{
throw new Exception("Missing close paren on Random(...).");
}
ParticleEmitterTokenizer.NextToken(ref tokenIter);
break;
case TokenType.RealNumber:
// min and max both equal realnumber
if (tokenIter.Current.Type != TokenType.RealNumber)
{
throw new Exception("Expecting number.");
}
number.Max = number.Min = float.Parse(tokenIter.Current.StringValue, CultureInfo.InvariantCulture.NumberFormat);
ParticleEmitterTokenizer.NextToken(ref tokenIter);
break;
default:
throw new Exception("Expecting either Random(...) or a number value.");
}
return(number);
}
public static MinMax <Color> ProcessColor(ref List <ParticleEmitterToken> .Enumerator tokenIter)
{
MinMax <Color> c = new MinMax <Color>();
// this token needs to be a RGBA keyword.
if (tokenIter.Current.Type != TokenType.KeywordColor)
{
throw new Exception("Expecting RGBA(...)!");
}
ParticleEmitterTokenizer.NextToken(ref tokenIter);
if (tokenIter.Current.Type != TokenType.OpenParen)
{
throw new Exception("Expecting ( after RGBA!");
}
MinMax <float> r = new MinMax <float>();
MinMax <float> g = new MinMax <float>();
MinMax <float> b = new MinMax <float>();
MinMax <float> a = new MinMax <float>();
ParticleEmitterTokenizer.NextToken(ref tokenIter);
r = ProcessNumber(ref tokenIter);
if (tokenIter.Current.Type != TokenType.Comma)
{
throw new Exception("Color components must be seperated by a comma.");
}
ParticleEmitterTokenizer.NextToken(ref tokenIter);
g = ProcessNumber(ref tokenIter);
if (tokenIter.Current.Type != TokenType.Comma)
{
throw new Exception("Color components must be seperated by a comma.");
}
ParticleEmitterTokenizer.NextToken(ref tokenIter);
b = ProcessNumber(ref tokenIter);
if (tokenIter.Current.Type != TokenType.Comma)
{
throw new Exception("Color components must be seperated by a comma.");
}
ParticleEmitterTokenizer.NextToken(ref tokenIter);
a = ProcessNumber(ref tokenIter);
if (tokenIter.Current.Type != TokenType.CloseParen)
{
throw new Exception("Expecting ) to close vector.");
}
ParticleEmitterTokenizer.NextToken(ref tokenIter);
c.Min = new Color(r.Min, g.Min, b.Min, a.Min);
c.Max = new Color(r.Max, g.Max, b.Max, a.Max);
return(c);
}