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using System.Diagnostics;
namespace LibNoise.Operator
{
/// <summary>
/// Provides a noise module that outputs the difference of the two output values from two
/// source modules. [OPERATOR]
/// </summary>
public class Subtract : ModuleBase
{
#region Constructors
/// <summary>
/// Initializes a new instance of Subtract.
/// </summary>
public Subtract()
: base(2)
{
}
/// <summary>
/// Initializes a new instance of Subtract.
/// </summary>
/// <param name="lhs">The left hand input module.</param>
/// <param name="rhs">The right hand input module.</param>
public Subtract(ModuleBase lhs, ModuleBase rhs)
: base(2)
{
Modules[0] = lhs;
Modules[1] = rhs;
}
#endregion
#region ModuleBase Members
/// <summary>
/// Returns the output value for the given input coordinates.
/// </summary>
/// <param name="x">The input coordinate on the x-axis.</param>
/// <param name="y">The input coordinate on the y-axis.</param>
/// <param name="z">The input coordinate on the z-axis.</param>
/// <returns>The resulting output value.</returns>
public override double GetValue(double x, double y, double z)
{
Debug.Assert(Modules[0] != null);
Debug.Assert(Modules[1] != null);
return Modules[0].GetValue(x, y, z) - Modules[1].GetValue(x, y, z);
}
#endregion
}
}
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