/// <summary>
/// Combines two surfaces using the operator of this binary expression
/// </summary>
/// <param name="leftSurface"></param>
/// <param name="rightSurface"></param>
/// <returns></returns>
private Functions.Surface combineSurface(Functions.Surface leftSurface, Functions.Surface rightSurface)
{
Functions.Surface retVal = null;
switch (Operation)
{
case BinaryExpression.OPERATOR.ADD:
retVal = leftSurface.AddSurface(rightSurface);
break;
case BinaryExpression.OPERATOR.SUB:
retVal = leftSurface.SubstractSurface(rightSurface);
break;
case BinaryExpression.OPERATOR.MULT:
retVal = leftSurface.MultiplySurface(rightSurface);
break;
case BinaryExpression.OPERATOR.DIV:
retVal = leftSurface.DivideSurface(rightSurface);
break;
}
return retVal;
}