$#include "Vector4.h"

/// Four-dimensional vector.
class Vector4
{
public:
    /// Construct undefined.
    Vector4();
    
    /// Copy-construct from another vector.
    Vector4(const Vector4& vector);
    
    /// Construct from a 3-dimensional vector and the W coordinate.
    Vector4(const Vector3& vector, float w);
    
    /// Construct from coordinates.
    Vector4(float x, float y, float z, float w);
    
    /// Test for equality with another vector without epsilon.
    bool operator == (const Vector4& rhs) const;

	/// Add a vector.
    Vector4 operator + (const Vector4& rhs) const;
    /// Return negation.
    Vector4 operator - () const;
    /// Subtract a vector.
    Vector4 operator - (const Vector4& rhs) const;
    /// Multiply with a scalar.
    Vector4 operator * (float rhs) const;
    /// Multiply with a vector.
    Vector4 operator * (const Vector4& rhs) const;
    /// Divide by a scalar.
    Vector4 operator / (float rhs) const;
    /// Divide by a vector.
    Vector4 operator / (const Vector4& rhs) const;
    
    /// Calculate dot product.
    float DotProduct(const Vector4& rhs) const;
    /// Calculate absolute dot product.
    float AbsDotProduct(const Vector4& rhs) const;
    /// Return absolute vector.
    Vector4 Abs() const;
    /// Linear interpolation with another vector.
    Vector4 Lerp(const Vector4& rhs, float t) const;
    /// Test for equality with another vector with epsilon.
    bool Equals(const Vector4& rhs) const;
    
    /// X coordinate.
    float x_ @ x;
    /// Y coordinate.
    float y_ @ y;
    /// Z coordinate.
    float z_ @ z;
    /// W coordinate.
    float w_ @ w;
    
    /// Zero vector.
    static const Vector4 ZERO;
    /// (1,1,1) vector.
    static const Vector4 ONE;
};