/// <summary>
/// Initializes a new instance of the Particle class
/// </summary>
/// <param name="m">Mass of particle</param>
/// <param name="p">Initial position of particle</param>
public Particle(float m, Vector3D p)
{
this.mass = m;
this.position = p;
this.isFixed = false;
this.isEnable = false;
this.age = 0.0F;
this.isDisposed = false;
this.velocity = new Vector3D();
this.force = new Vector3D();
}
/// <summary>
/// Sets all three coordinates of vector at a time
/// copy coordinates of parameter vector
/// </summary>
/// <param name="p">Vector to copy</param>
public void Set(Vector3D p)
{
this.x = p.x;
this.y = p.y;
this.z = p.z;
}
/// <summary>
/// Substracts in place two vectors, coordinates by coordinates
/// </summary>
/// <param name="p">Vector to substract</param>
/// <returns>Current vector substracted of p</returns>
public Vector3D Subtract(Vector3D p)
{
this.x -= p.x;
this.y -= p.y;
this.z -= p.z;
return this;
}
/// <summary>
/// Calculate the resultant of two vectors
/// </summary>
/// <param name="p">Vector to substract</param>
/// <returns>Resultant vector</returns>
public Vector3D Minus(Vector3D p)
{
return new Vector3D(this.x - p.x, this.y - p.y, this.z - p.z);
}
/// <summary>
/// Calculate the resultant of two vectors
/// </summary>
/// <param name="p">Vector to add</param>
/// <returns>Resultant vector</returns>
public Vector3D Plus(Vector3D p)
{
return new Vector3D(this.x + p.x, this.y + p.y, this.z + p.z);
}
/// <summary>
/// Multiply two vectors, coordinate by coordinate
/// </summary>
/// <param name="p">Vector to multiply</param>
/// <returns>New vector that holds multiplication result</returns>
public float Dot(Vector3D p)
{
return (this.x * p.x) + (this.y * p.y) + (this.z * p.z);
}
/// <summary>
/// Calculate distance to given vector
/// </summary>
/// <param name="p">Distant vector</param>
/// <returns>Euclydian distance</returns>
public float DistanceTo(Vector3D p)
{
float dx = this.x - p.x;
float dy = this.y - p.y;
float dz = this.z - p.z;
return (float)Math.Sqrt((dx * dx) + (dy * dy) + (dz * dz));
}
/// <summary>
/// Calculate vectorial product
/// u.Cross(v)
/// </summary>
/// <param name="p">Second term of vectorial product</param>
/// <returns>Vectorial product u^v</returns>
public Vector3D Cross(Vector3D p)
{
return new Vector3D(
(this.y * p.z) - (this.z * p.y),
(this.z * p.x) - (this.x * p.z),
(this.x * p.y) - (this.y * p.x));
}
/// <summary>
/// Adds in place two vectors, coordinates by coordinates
/// </summary>
/// <param name="p">Vector to add</param>
/// <returns>Current vector added with p</returns>
public Vector3D Add(Vector3D p)
{
this.x += p.x;
this.y += p.y;
this.z += p.z;
return this;
}
/// <summary>
/// Initializes a new instance of the Vector3D class
/// copying the coordinate of the argument vector
/// </summary>
/// <param name="p">Vector to copy</param>
public Vector3D(Vector3D p)
{
this.x = p.x;
this.y = p.y;
this.z = p.z;
}