/// <summary>
/// Calculates the distance between a point and a solid oriented box.
/// </summary>
/// <param name="point">A <see cref="Vector2F"/> instance.</param>
/// <param name="obb">An <see cref="OrientedBox"/> instance.</param>
/// <returns>The distance between a point and a solid oriented box.</returns>
/// <remarks>
/// Treating the oriented box as solid means that any point inside the box has
/// distance zero from the box.
/// </remarks>
public static float Distance(Vector2F point, OrientedBox obb)
{
return (float)System.Math.Sqrt(SquaredDistance(point, obb));
}
/// <summary>
/// Calculates the squared distance between a point and a solid oriented box.
/// </summary>
/// <param name="point">A <see cref="Vector2F"/> instance.</param>
/// <param name="obb">An <see cref="OrientedBox"/> instance.</param>
/// <param name="closestPoint">The closest point in box coordinates.</param>
/// <returns>The squared distance between a point and a solid oriented box.</returns>
/// <remarks>
/// Treating the oriented box as solid means that any point inside the box has
/// distance zero from the box.
/// </remarks>
public static float SquaredDistancePointSolidOrientedBox(Vector2F point, OrientedBox obb, out Vector2F closestPoint)
{
Vector2F diff = point - obb.Center;
Vector2F closest = new Vector2F(
Vector2F.Dot(diff, obb.Axis1),
Vector2F.Dot(diff, obb.Axis2));
float sqrDist = 0.0f;
float delta = 0.0f;
if (closest.X < -obb.Extent1)
{
delta = closest.X + obb.Extent1;
sqrDist += delta*delta;
closest.X = -obb.Extent1;
}
else if (closest.X > obb.Extent1)
{
delta = closest.X - obb.Extent1;
sqrDist += delta*delta;
closest.X = obb.Extent1;
}
if (closest.Y < -obb.Extent2)
{
delta = closest.Y + obb.Extent2;
sqrDist += delta*delta;
closest.Y = -obb.Extent2;
}
else if (closest.Y > obb.Extent2)
{
delta = closest.Y - obb.Extent2;
sqrDist += delta*delta;
closest.Y = obb.Extent2;
}
closestPoint = closest;
return sqrDist;
}
/// <summary>
/// Calculates the squared distance between a point and a solid oriented box.
/// </summary>
/// <param name="point">A <see cref="Vector2F"/> instance.</param>
/// <param name="obb">An <see cref="OrientedBox"/> instance.</param>
/// <returns>The squared distance between a point and a solid oriented box.</returns>
/// <remarks>
/// Treating the oriented box as solid means that any point inside the box has
/// distance zero from the box.
/// </remarks>
public static float SquaredDistance(Vector2F point, OrientedBox obb)
{
Vector2F temp;
return SquaredDistancePointSolidOrientedBox(point, obb, out temp);
}
/// <summary>
/// Initializes a new instance of the <see cref="OrientedBox"/> class using given values from another box instance.
/// </summary>
/// <param name="box">A <see cref="OrientedBox"/> instance to take values from.</param>
public OrientedBox(OrientedBox box)
{
_center = box.Center;
_axis1 = box.Axis1;
_axis2 = box.Axis2;
_extent1 = box.Extent1;
_extent2 = box.Extent2;
}
/// <summary>
/// Calculates the distance between a point and a solid oriented box.
/// </summary>
/// <param name="point">A <see cref="Vector2F"/> instance.</param>
/// <param name="obb">An <see cref="OrientedBox"/> instance.</param>
/// <returns>The distance between a point and a solid oriented box.</returns>
/// <remarks>
/// Treating the oriented box as solid means that any point inside the box has
/// distance zero from the box.
/// </remarks>
public static float Distance(Vector2F point, OrientedBox obb)
{
return((float)System.Math.Sqrt(SquaredDistance(point, obb)));
}
/// <summary>
/// Calculates the squared distance between a point and a solid oriented box.
/// </summary>
/// <param name="point">A <see cref="Vector2F"/> instance.</param>
/// <param name="obb">An <see cref="OrientedBox"/> instance.</param>
/// <returns>The squared distance between a point and a solid oriented box.</returns>
/// <remarks>
/// Treating the oriented box as solid means that any point inside the box has
/// distance zero from the box.
/// </remarks>
public static float SquaredDistance(Vector2F point, OrientedBox obb)
{
Vector2F temp;
return(SquaredDistancePointSolidOrientedBox(point, obb, out temp));
}
