/// <summary>
/// Query the world for all fixtures that potentially overlap the
/// provided AABB.
/// </summary>
/// <param name="callback">A user implemented callback class.</param>
/// <param name="aabb">The aabb query box.</param>
public void QueryAABB(Func<Fixture, bool> callback, ref AABB aabb)
{
_queryAABBCallback = callback;
ContactManager.BroadPhase.Query(_queryAABBCallbackWrapper, ref aabb);
_queryAABBCallback = null;
}
/// <summary>
/// Get all intersections between a line segment and an AABB.
/// </summary>
/// <param name="point1">The first point of the line segment to test</param>
/// <param name="point2">The second point of the line segment to test.</param>
/// <param name="aabb">The AABB that is used for testing intersection.</param>
/// <param name="intersectionPoints">An list of intersection points. Any intersection points found will be added to this list.</param>
public static void LineSegmentAABBIntersect(ref Vector2 point1, ref Vector2 point2, AABB aabb,
ref List<Vector2> intersectionPoints)
{
LineSegmentVerticesIntersect(ref point1, ref point2, aabb.Vertices, ref intersectionPoints);
}
/// <summary>
/// Get the fixture's AABB. This AABB may be enlarge and/or stale.
/// If you need a more accurate AABB, compute it using the Shape and
/// the body transform.
/// </summary>
/// <param name="aabb">The aabb.</param>
/// <param name="childIndex">Index of the child.</param>
public void GetAABB(out AABB aabb, int childIndex)
{
Debug.Assert(0 <= childIndex && childIndex < ProxyCount);
aabb = Proxies[childIndex].AABB;
}
/// <summary>
/// Does this aabb contain the provided AABB.
/// </summary>
/// <param name="aabb">The aabb.</param>
/// <returns>
/// <c>true</c> if it contains the specified aabb; otherwise, <c>false</c>.
/// </returns>
public bool Contains(ref AABB aabb)
{
bool result = true;
result = result && LowerBound.X <= aabb.LowerBound.X;
result = result && LowerBound.Y <= aabb.LowerBound.Y;
result = result && aabb.UpperBound.X <= UpperBound.X;
result = result && aabb.UpperBound.Y <= UpperBound.Y;
return result;
}
/// <summary>
/// Combine two AABBs into this one.
/// </summary>
/// <param name="aabb1">The aabb1.</param>
/// <param name="aabb2">The aabb2.</param>
public void Combine(ref AABB aabb1, ref AABB aabb2)
{
LowerBound = Vector2.Min(aabb1.LowerBound, aabb2.LowerBound);
UpperBound = Vector2.Max(aabb1.UpperBound, aabb2.UpperBound);
}
/// <summary>
/// Combine an AABB into this one.
/// </summary>
/// <param name="aabb">The aabb.</param>
public void Combine(ref AABB aabb)
{
LowerBound = Vector2.Min(LowerBound, aabb.LowerBound);
UpperBound = Vector2.Max(UpperBound, aabb.UpperBound);
}
public static bool TestOverlap(ref AABB a, ref AABB b)
{
Vector2 d1 = b.LowerBound - a.UpperBound;
Vector2 d2 = a.LowerBound - b.UpperBound;
if (d1.X > 0.0f || d1.Y > 0.0f)
return false;
if (d2.X > 0.0f || d2.Y > 0.0f)
return false;
return true;
}