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

using System; 
 
namespace VehicleDynamics 
{ 
	///
 
	///Class for Linear Function Interpolation 
	///
 
	public class LFI   
	{ 
		private double[] data = new double[101]; 
		private double   slope = 1.0; 
		private double   intercept = 0.0; 
 
		public double Slope  
		{  
			get { return slope; }  
			set { slope = value; }  
		} 
		public double Intercept  
		{  
			get { return intercept; }  
			set { intercept = value; }  
		} 
 
 
	///
 
	///Method to place curve data into the class 
	///
 
	public bool SetDataPoint(double index_value, float data_point) 
{ 
	bool result = false; 
	int index = (int)(index_value / slope - intercept); 
 
	if ( index >= 0 && index <= 100 )  
{ 
	data[index] = data_point; 
	result = true; 
} 
 
			return result; 
 
		} 
 
		///
 
		///Method to interpolate linearly to get a value from a data curve. 
		///
 
		public double Interpolate( double index_value ) 
		{ 
			double delta; 
			double result = 0.0; 
 
			try  
			{ 
				double scaled_value = index_value / slope - intercept; 
				int index = (int)scaled_value; 
				delta = data[index+1] - data[index]; 
				result = data[index] + delta * (scaled_value - index); 
			} 
			catch ( Exception e ) 
			{ 
				System.Diagnostics.Debug.WriteLine(e.Message); 
			} 
 
			return result; 
 
		} 
 
	}; 
}