static Vector2D()
{
_zero = new Vector2D(0f, 0f);
_unit = new Vector2D(1f, 1f);
_unitX = new Vector2D(1f, 0f);
_unitY = new Vector2D(0f, 1f);
}
public static Vector2D Subtract(Vector2D left, Vector2D right)
{
return new Vector2D(left.X - right.X, left.Y - right.Y);
}
/// <summary>
/// Constructor.
/// </summary>
/// <param name="position">Position of the star.</param>
/// <param name="magnitude">Magnitude of the star.</param>
public Star(Vector2D position, Pen magnitude)
{
Position = position;
Magnitude = magnitude;
VDelta = 0;
}
public static Vector2D Negate(Vector2D left)
{
return new Vector2D(-left.X, -left.Y);
}
public static Vector2D Normalize(Vector2D vector)
{
Vector2D zero = Zero;
if (vector.Length > float.Epsilon)
{
float inverseLength = vector.InverseLength;
zero.X = vector.X * inverseLength;
zero.Y = vector.Y * inverseLength;
}
return zero;
}
public static Vector2D Multiply(Vector2D left, Vector2D right)
{
return new Vector2D(left.X * right.X, left.Y * right.Y);
}
public static Vector2D Multiply(Vector2D left, float right)
{
return new Vector2D(left.X * right, left.Y * right);
}
public static Vector2D Divide(Vector2D dividend, float divisor)
{
return new Vector2D(dividend.X / divisor, dividend.Y / divisor);
}
public static float DotProduct(Vector2D left, Vector2D right)
{
return ((left.X * right.X) + (left.Y * right.Y));
}
public static Vector2D CrossProduct(Vector2D vector1, Vector2D vector2)
{
return new Vector2D((vector2.X * vector1.Y) - (vector2.Y * vector1.X), (vector2.Y * vector1.X) - (vector2.X * vector1.Y));
}
public static Vector2D Divide(Vector2D dividend, Vector2D divisor)
{
return new Vector2D(dividend.X / divisor.X, dividend.Y / divisor.Y);
}
public static float Angle(Vector2D vector1, Vector2D vector2)
{
vector1.Normalize();
vector2.Normalize();
return MathUtility.ACos(DotProduct(vector1, vector2));
}
public static Vector2D Add(Vector2D left, Vector2D right)
{
return new Vector2D(left.X + right.X, left.Y + right.Y);
}
public static Vector2D Round(Vector2D value, int decimalPlaceCount, MidpointRounding rounding)
{
return new Vector2D(Round(value.X, decimalPlaceCount, rounding), Round(value.Y, decimalPlaceCount, rounding));
}
public static Vector2D Round(Vector2D value, int decimalPlaceCount)
{
return new Vector2D(Round(value.X, decimalPlaceCount), Round(value.Y, decimalPlaceCount));
}
public static Vector2D Round(Vector2D value)
{
return new Vector2D(Round(value.X), Round(value.Y));
}
