/// <summary>
/// Computes the closest <see cref="Point2" /> on this <see cref="BoundingRectangle" /> to a specified
/// <see cref="Point2" />.
/// </summary>
/// <param name="point">The point.</param>
/// <returns>The closest <see cref="Point2" /> on this <see cref="BoundingRectangle" /> to the <paramref name="point" />.</returns>
public Point2 ClosestPointTo(Point2 point)
{
Point2 result;
PrimitivesHelper.ClosestPointToPointFromRectangle(Center - HalfExtents, Center + HalfExtents, point, out result);
return(result);
}
/// <summary>
/// Computes the <see cref="BoundingRectangle" /> from the specified <see cref="BoundingRectangle" /> transformed by
/// the
/// specified <see cref="Matrix2" />.
/// </summary>
/// <param name="boundingRectangle">The bounding rectangle.</param>
/// <param name="transformMatrix">The transform matrix.</param>
/// <param name="result">The resulting bounding rectangle.</param>
/// <returns>
/// The <see cref="BoundingRectangle" /> from the <paramref name="boundingRectangle" /> transformed by the
/// <paramref name="transformMatrix" />.
/// </returns>
/// <remarks>
/// <para>
/// If a transformed <see cref="BoundingRectangle" /> is used for <paramref name="boundingRectangle" /> then the
/// resulting <see cref="BoundingRectangle" /> will have the compounded transformation, which most likely is
/// not desired.
/// </para>
/// </remarks>
public static void Transform(ref BoundingRectangle boundingRectangle,
ref Matrix2 transformMatrix, out BoundingRectangle result)
{
PrimitivesHelper.TransformRectangle(ref boundingRectangle.Center, ref boundingRectangle.HalfExtents, ref transformMatrix);
result.Center = boundingRectangle.Center;
result.HalfExtents = boundingRectangle.HalfExtents;
}
/// <summary>
/// Computes the closest <see cref="Point2" /> on this <see cref="RectangleF" /> to a specified
/// <see cref="Point2" />.
/// </summary>
/// <param name="point">The point.</param>
/// <returns>The closest <see cref="Point2" /> on this <see cref="RectangleF" /> to the <paramref name="point" />.</returns>
public Point2 ClosestPointTo(Point2 point)
{
Point2 result;
PrimitivesHelper.ClosestPointToPointFromRectangle(TopLeft, BottomRight, point, out result);
return(result);
}
/// <summary>
/// Computes the <see cref="BoundingRectangle" /> from a list of <see cref="Point2" /> structures.
/// </summary>
/// <param name="points">The points.</param>
/// <param name="result">The resulting bounding rectangle.</param>
public static void CreateFrom(IReadOnlyList <Point2> points, out BoundingRectangle result)
{
Point2 minimum;
Point2 maximum;
PrimitivesHelper.CreateRectangleFromPoints(points, out minimum, out maximum);
CreateFrom(minimum, maximum, out result);
}
/// <summary>
/// Computes the <see cref="RectangleF" /> from the specified <see cref="RectangleF" /> transformed by
/// the specified <see cref="Matrix2" />.
/// </summary>
/// <param name="rectangle">The rectangle to be transformed.</param>
/// <param name="transformMatrix">The transform matrix.</param>
/// <param name="result">The resulting transformed rectangle.</param>
/// <returns>
/// The <see cref="BoundingRectangle" /> from the <paramref name="rectangle" /> transformed by the
/// <paramref name="transformMatrix" />.
/// </returns>
/// <remarks>
/// <para>
/// If a transformed <see cref="BoundingRectangle" /> is used for <paramref name="rectangle" /> then the
/// resulting <see cref="BoundingRectangle" /> will have the compounded transformation, which most likely is
/// not desired.
/// </para>
/// </remarks>
public static void Transform(ref RectangleF rectangle,
ref Matrix2 transformMatrix, out RectangleF result)
{
var center = rectangle.Center;
var halfExtents = (Vector2)rectangle.Size * 0.5f;
PrimitivesHelper.TransformRectangle(ref center, ref halfExtents, ref transformMatrix);
result.X = center.X - halfExtents.X;
result.Y = center.Y - halfExtents.Y;
result.Width = halfExtents.X * 2;
result.Height = halfExtents.Y * 2;
}
/// <summary>
/// Determines whether this <see cref="Segment2" /> intersects with the specified <see cref="BoundingRectangle" />.
/// </summary>
/// <param name="boundingRectangle">The bounding box.</param>
/// <param name="intersectionPoint">
/// When this method returns, contains the <see cref="Point2" /> of intersection, if an
/// intersection was found; otherwise, the <see cref="Point2.NaN" />. This parameter is passed uninitialized.
/// </param>
/// <returns>
/// <c>true</c> if this <see cref="Segment2" /> intersects with <paramref name="boundingRectangle" />; otherwise,
/// <c>false</c>.
/// </returns>
public bool Intersects(BoundingRectangle boundingRectangle, out Point2 intersectionPoint)
{
// Real-Time Collision Detection, Christer Ericson, 2005. Chapter 5.3; Basic Primitive Tests - Intersecting Lines, Rays, and (Directed Segments). pg 179-181
var minimumPoint = boundingRectangle.Center - boundingRectangle.HalfExtents;
var maximumPoint = boundingRectangle.Center + boundingRectangle.HalfExtents;
var minimumDistance = float.MinValue;
var maximumDistance = float.MaxValue;
var direction = End - Start;
if (
!PrimitivesHelper.IntersectsSlab(Start.X, direction.X, minimumPoint.X, maximumPoint.X, ref minimumDistance,
ref maximumDistance))
{
intersectionPoint = Point2.NaN;
return(false);
}
if (
!PrimitivesHelper.IntersectsSlab(Start.Y, direction.Y, minimumPoint.Y, maximumPoint.Y, ref minimumDistance,
ref maximumDistance))
{
intersectionPoint = Point2.NaN;
return(false);
}
// Segment intersects the 2 slabs.
if (minimumDistance <= 0)
{
intersectionPoint = Start;
}
else
{
intersectionPoint = minimumDistance * direction;
intersectionPoint.X += Start.X;
intersectionPoint.Y += Start.Y;
}
return(true);
}
/// <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>
/// 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));
}
