www.pudn.com > IntroductionTo3DGameEngineDesign.rar > Transitioner.cs

using System; 
using System.Xml; 
 
namespace GameAI 
{ 
	/// 
 
	/// Summary description for Transitioner. 
	/// 
 
	public class Transitioner 
	{ 
		#region Attributes 
		private Expression m_expression = null; 
		private AIState    m_target_state; 
		#endregion 
 
		#region Properties 
		#endregion 
 
		public Transitioner(Expression expression, AIState target_state) 
		{ 
			m_expression = expression; 
			m_target_state = target_state; 
		} 
 
		public AIState Evaluate( AIState old_state ) 
		{ 
			AIState new_state = old_state; 
 
			if ( m_expression != null ) 
			{ 
				if ( m_expression.Evaluate() ) 
				{ 
					new_state = m_target_state; 
				} 
			} 
 
			return new_state; 
		} 
 
 
		public void Write( XmlTextWriter writer ) 
		{ 
			writer.WriteStartElement("Transitioner"); 
			writer.WriteElementString("Target", m_target_state.Name); 
			m_expression.Write( writer ); 
			writer.WriteEndElement(); 
		} 
 
		public void Read ( XmlTextReader reader, Thinker thinker ) 
		{ 
			bool done = false; 
 
			while ( !done )  
			{ 
				reader.Read(); 
 
				if ( reader.NodeType == XmlNodeType.EndElement && 
					reader.Name == "Transitioner" ) 
				{ 
					done =true; 
				} 
					// Process a start of element node. 
				else if (reader.NodeType == XmlNodeType.Element)  
				{  
					// Process a text node. 
					if ( reader.Name == "Expression" )  
					{ 
						m_expression.Read( reader, thinker ); 
					} 
				} 
			}// End while loop 
		} 
	} 
}