/// <summary>
/// Computes the <see cref="BoundingRectangle" /> from a minimum <see cref="Point2" /> and maximum
/// <see cref="Point2" />.
/// </summary>
/// <param name="minimum">The minimum point.</param>
/// <param name="maximum">The maximum point.</param>
/// <param name="result">The resulting bounding rectangle.</param>
public static void CreateFrom(Point2 minimum, Point2 maximum, out BoundingRectangle result)
{
result.Center = new Point2((maximum.X + minimum.X) * 0.5f, (maximum.Y + minimum.Y) * 0.5f);
result.HalfExtents = new Vector2((maximum.X - minimum.X) * 0.5f, (maximum.Y - minimum.Y) * 0.5f);
}
/// <summary>
/// Computes the squared distance from this <see cref="BoundingRectangle"/> to a <see cref="Point2"/>.
/// </summary>
/// <param name="point">The point.</param>
/// <returns>The squared distance from this <see cref="BoundingRectangle"/> to the <paramref name="point"/>.</returns>
public float SquaredDistanceTo(Point2 point)
{
return(PrimitivesHelper.SquaredDistanceToPointFromRectangle(Center - HalfExtents, Center + HalfExtents, point));
}
/// <summary>
/// Initializes a new instance of the <see cref="BoundingRectangle" /> structure from the specified centre
/// <see cref="Point2" /> and the radii <see cref="Size2" />.
/// </summary>
/// <param name="center">The centre <see cref="Point2" />.</param>
/// <param name="halfExtents">The radii <see cref="Vector2" />.</param>
public BoundingRectangle(Point2 center, Size2 halfExtents)
{
Center = center;
HalfExtents = halfExtents;
}
/// <summary>
/// Determines whether the specified <see cref="BoundingRectangle" /> contains the specified
/// <see cref="Point2" />.
/// </summary>
/// <param name="boundingRectangle">The bounding rectangle.</param>
/// <param name="point">The point.</param>
/// <returns>
/// <c>true</c> if the <paramref name="boundingRectangle" /> contains the <paramref name="point" />; otherwise,
/// <c>false</c>.
/// </returns>
public static bool Contains(BoundingRectangle boundingRectangle, Point2 point)
{
return(Contains(ref boundingRectangle, ref point));
}
/// <summary>
/// Determines whether this <see cref="BoundingRectangle" /> contains the specified <see cref="Point2" />.
/// </summary>
/// <param name="point">The point.</param>
/// <returns>
/// <c>true</c> if this <see cref="BoundingRectangle" /> contains the <paramref name="point" />; otherwise,
/// <c>false</c>.
/// </returns>
public bool Contains(Point2 point)
{
return(Contains(this, point));
}
/// <summary>
/// Computes the squared distance from this <see cref="RectangleF"/> to a <see cref="Point2"/>.
/// </summary>
/// <param name="point">The point.</param>
/// <returns>The squared distance from this <see cref="RectangleF"/> to the <paramref name="point"/>.</returns>
public float SquaredDistanceTo(Point2 point)
{
return(PrimitivesHelper.SquaredDistanceToPointFromRectangle(TopLeft, BottomRight, point));
}
/// <summary>
/// Computes the distance from this <see cref="RectangleF"/> to a <see cref="Point2"/>.
/// </summary>
/// <param name="point">The point.</param>
/// <returns>The distance from this <see cref="RectangleF"/> to the <paramref name="point"/>.</returns>
public float DistanceTo(Point2 point)
{
return((float)Math.Sqrt(SquaredDistanceTo(point)));
}
/// <summary>
/// Determines whether the specified <see cref="RectangleF" /> contains the specified
/// <see cref="Point2" />.
/// </summary>
/// <param name="rectangle">The rectangle.</param>
/// <param name="point">The point.</param>
/// <returns>
/// <c>true</c> if the <paramref name="rectangle" /> contains the <paramref name="point" />; otherwise,
/// <c>false</c>.
/// </returns>
public static bool Contains(RectangleF rectangle, Point2 point)
{
return(Contains(ref rectangle, ref point));
}
/// <summary>
/// Determines whether this <see cref="RectangleF" /> contains the specified
/// <see cref="Point2" />.
/// </summary>
/// <param name="point">The point.</param>
/// <returns>
/// <c>true</c> if the this <see cref="RectangleF"/> contains the <paramref name="point" />; otherwise,
/// <c>false</c>.
/// </returns>
public bool Contains(Point2 point)
{
return(Contains(ref this, ref point));
}
/// <summary>
/// Determines whether the specified <see cref="RectangleF" /> contains the specified
/// <see cref="Point2" />.
/// </summary>
/// <param name="rectangle">The rectangle.</param>
/// <param name="point">The point.</param>
/// <returns>
/// <c>true</c> if the <paramref name="rectangle" /> contains the <paramref name="point" />; otherwise,
/// <c>false</c>.
/// </returns>
public static bool Contains(ref RectangleF rectangle, ref Point2 point)
{
return(rectangle.X <= point.X && point.X < rectangle.X + rectangle.Width && rectangle.Y <= point.Y && point.Y < rectangle.Y + rectangle.Height);
}
/// <summary>
/// Initializes a new instance of the <see cref="Ray2" /> structure from the specified position and direction.
/// </summary>
/// <param name="position">The starting point.</param>
/// <param name="direction">The direction vector.</param>
public Ray2(Point2 position, Vector2 direction)
{
Position = position;
Direction = direction;
}
internal static float SquaredDistanceToPointFromRectangle(Point2 minimum, Point2 maximum, Point2 point)
{
// Real-Time Collision Detection, Christer Ericson, 2005. Chapter 5.1.3.1; Basic Primitive Tests - Closest-point Computations - Distance of Point to AABB. pg 130-131
var squaredDistance = 0.0f;
// for each axis add up the excess distance outside the box
// x-axis
if (point.X < minimum.X)
{
var distance = minimum.X - point.X;
squaredDistance += distance * distance;
}
else if (point.X > maximum.X)
{
var distance = maximum.X - point.X;
squaredDistance += distance * distance;
}
// y-axis
if (point.Y < minimum.Y)
{
var distance = minimum.Y - point.Y;
squaredDistance += distance * distance;
}
else if (point.Y > maximum.Y)
{
var distance = maximum.Y - point.Y;
squaredDistance += distance * distance;
}
return(squaredDistance);
}
internal static void CreateRectangleFromPoints(IReadOnlyList <Point2> points, out Point2 minimum, out Point2 maximum)
{
// Real-Time Collision Detection, Christer Ericson, 2005. Chapter 4.2; Bounding Volumes - Axis-aligned Bounding Boxes (AABBs). pg 82-84
if (points == null || points.Count == 0)
{
minimum = Point2.Zero;
maximum = Point2.Zero;
return;
}
minimum = maximum = points[0];
// ReSharper disable once ForCanBeConvertedToForeach
for (var index = points.Count - 1; index > 0; --index)
{
var point = points[index];
minimum = Point2.Minimum(minimum, point);
maximum = Point2.Maximum(maximum, point);
}
}
internal static void ClosestPointToPointFromRectangle(Point2 minimum, Point2 maximum, Point2 point, out Point2 result)
{
// Real-Time Collision Detection, Christer Ericson, 2005. Chapter 5.1.2; Basic Primitive Tests - Closest-point Computations. pg 130-131
result = point;
// For each coordinate axis, if the point coordinate value is outside box, clamp it to the box, else keep it as is
if (result.X < minimum.X)
{
result.X = minimum.X;
}
else if (result.X > maximum.X)
{
result.X = maximum.X;
}
if (result.Y < minimum.Y)
{
result.Y = minimum.Y;
}
else if (result.Y > maximum.Y)
{
result.Y = maximum.Y;
}
}