public SteinerPoint2D(Vector2D a, Vector2D b, int i)
{
ID = i;
parent = new Vector2D[2];
parent[0] = a;
parent[1] = b;
}
public Vector2DCollection(Vector2D[] vectors, int capacity)
{
Capacity = capacity;
CurrentCount = vectors.Length;
if (Capacity < CurrentCount)
{
throw (new CollectionCapacityException());
}
Vectors = vectors;
}
public Vector2D(Vector2D v)
: base(v)
{
}
/// <summary>
/// Returns a normalized vector perpendicular to this vector. Equivalent to rotating this vector 90 degrees clockwise.
/// </summary>
/// <returns>A normalized vector perpendicular to this vector.</returns>
public Vector2D UnitNormal()
{
Vector2D normal = new Vector2D(Y, -X);
return normal.Normalize();;
}
/// <summary>
/// Rotates this vector counter-clockwise about the origin by <paramref name="radians"/> radians
/// </summary>
/// <param name="radians">Number of radians to rotate by</param>
public Vector2D Rotate(double radians)
{
Vector2D v = new Vector2D(this);
double cos = Math.Cos(radians);
double sin = Math.Sin(radians);
v.X = this.X * cos - this.Y * sin;
v.Y = this.X * sin + this.Y * cos;
return v;
}
/// <summary>
/// Returns the angle by rotate a around b. [0, 2pi)
/// </summary>
/// <param name="a">the first vector.</param>
/// <param name="b">the second vector.</param>
/// <returns>the angle.</returns>
public static double RotateAngle(Vector2D a, Vector2D b)
{
double d = b.Arg - a.Arg;
if (d < 0)
{
d += 2 * Math.PI;
}
return d;
}
/// <summary>
/// Returns the determinant of two vectors, that is, the determinant of the 2 x 2 matrix they form.
/// </summary>
/// <param name="a">The first vector.</param>
/// <param name="b">The second vector.</param>
/// <returns>The determinant of <paramref name="a"/> and <paramref name="b"/>.</returns>
public static double Determinant(Vector2D a, Vector2D b)
{
return a.X * b.Y - a.Y * b.X;
}
/// <summary>
/// Returns the cross product of two vectors. The cross product of the 2 2D vectors a and b is defined
/// as the determinant of the 2 by 2 matrix (a, b) where the vectors are written in row or column order.
/// </summary>
/// <param name="a">The first vector.</param>
/// <param name="b">The second vector.</param>
/// <returns>The cross product of <paramref name="a"/> and <paramref name="b"/>.</returns>
public static Vector2D Cross(Vector2D a, Vector2D b)
{
return new Vector2D(a.X * b.Y , - a.Y * b.X);
}
/// <summary>
/// Returns the angle between two vectors. (-pi, pi]
/// </summary>
/// <param name="a">the first vector.</param>
/// <param name="b">the second vector.</param>
/// <returns>the angle.</returns>
public static double Angle(Vector2D a, Vector2D b)
{
double d = b.Arg - a.Arg;
if (d > Math.PI)
{
d -= 2 * Math.PI;
}
else if (d < -Math.PI)
{
d += 2 * Math.PI;
}
return d;
}
public Matrix2D(Vector2D a, Vector2D b)
: base(new Vector[]{(Vector)a, (Vector)b})
{
}
private void Triangulation(int a, int b, int c)
{
Debug.Assert(a != b && b != c && c != a);
Triangle2D triangle = new Triangle2D(this.polygon.GetPoint(a), this.polygon.GetPoint(b), this.polygon.GetPoint(c));
GhostTriangle2D ghost = new GhostTriangle2D(a, b, c);
this.triangles.Add(triangle);
this.ghostTriangles.Add(ghost);
if (lineSegments.Count < polygon.VertexCount - 3)
{
Vector2D internalSegment = new Vector2D(a, c);
LineSegment2D lineSegment = new LineSegment2D(this.polygon.GetPoint(a), this.polygon.GetPoint(c));
this.lineSegments.Add(lineSegment);
this.internalSegments.Add(internalSegment);
}
}
public Vector2DCollection(Vector2D[] vectors)
{
Capacity = vectors.Length;
Vectors = vectors;
CurrentCount = Capacity;
}
public void Union(Vector2DCollection vector2DCollection)
{
Capacity += vector2DCollection.Capacity;
Vector2D[] vectors = new Vector2D[Capacity];
this.Vectors.CopyTo(vectors, 0);
vector2DCollection.Vectors.CopyTo(vectors, this.Count);
this.Vectors = vectors;
CurrentCount += vector2DCollection.Count;
}
public void Add(Vector2D vector)
{
try
{
base.Add();
}
catch (CollectionCapacityException e)
{
string emsg = e.Message;
this.Capacity *= 2;
Vector2D[] vectors = new Vector2D[Capacity];
this.Vectors.CopyTo(vectors, 0);
this.Vectors = vectors;
base.Add();
}
Vectors[CurrentCount - 1] = vector;
}
