$#include "Vector4.h"

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

    /// Add a vector.
    Vector4 operator + (const Vector4& rhs) const { return Vector4(x_ + rhs.x_, y_ + rhs.y_, z_ + rhs.z_, w_ + rhs.w_); }
    /// Return negation.
    Vector4 operator - () const { return Vector4(-x_, -y_, -z_, -w_); }
    /// Subtract a vector.
    Vector4 operator - (const Vector4& rhs) const { return Vector4(x_ - rhs.x_, y_ - rhs.y_, z_ - rhs.z_, w_ - rhs.w_); }
    /// Multiply with a scalar.
    Vector4 operator * (float rhs) const { return Vector4(x_ * rhs, y_ * rhs, z_ * rhs, w_ * rhs); }
    /// Multiply with a vector.
    Vector4 operator * (const Vector4& rhs) const { return Vector4(x_ * rhs.x_, y_ * rhs.y_, z_ * rhs.z_, w_ * rhs.w_); }
    /// Divide by a scalar.
    Vector4 operator / (float rhs) const { return Vector4(x_ / rhs, y_ / rhs, z_ / rhs, w_ / rhs); }
    /// Divide by a vector.
    Vector4 operator / (const Vector4& rhs) const { return Vector4(x_ / rhs.x_, y_ / rhs.y_, z_ / rhs.z_, w_ / rhs.w_); }
    Vector4 operator / (const Vector4& rhs) const;
    
    /// Calculate dot product.
    float DotProduct(const Vector4& rhs) const { return x_ * rhs.x_ + y_ * rhs.y_ + z_ * rhs.z_ + w_ * rhs.w_; }
    /// Calculate absolute dot product.
    float AbsDotProduct(const Vector4& rhs) const { return Urho3D::Abs(x_ * rhs.x_) + Urho3D::Abs(y_ * rhs.y_) + Urho3D::Abs(z_ * rhs.z_) + Urho3D::Abs(w_ * rhs.w_); }
    /// Return absolute vector.
    Vector4 Abs() const { return Vector4(Urho3D::Abs(x_), Urho3D::Abs(y_), Urho3D::Abs(z_), Urho3D::Abs(w_)); }
    /// Linear interpolation with another vector.
    Vector4 Lerp(const Vector4& rhs, float t) const { return *this * (1.0f - t) + rhs * t; }
    /// Test for equality with another vector with epsilon.
    bool Equals(const Vector4& rhs) const { return Urho3D::Equals(x_, rhs.x_) && Urho3D::Equals(y_, rhs.y_) && Urho3D::Equals(z_, rhs.z_) && Urho3D::Equals(w_, rhs.w_); }

    /// Return as string.
    String ToString() 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;
};