/// <summary>
/// Is this segment is inside or intersects the given bounding box?
/// </summary>
/// <param name="r">The bounding box.</param>
/// <returns>Returns true if this segment is inside or intersects the given bounding box.</returns>
public bool Intersects(Box2d r)
{
var b = a + ab;
if (r.Contains(a) || r.Contains(b))
{
return(true);
}
var t = new Box2d(a, b);
if (t.xmin > r.xmax || t.xmax < r.xmin || t.ymin > r.ymax || t.ymax < r.ymin)
{
return(false);
}
var p0 = Vector2d.Cross(ab, new Vector2d(r.xmin, r.ymin) - a);
var p1 = Vector2d.Cross(ab, new Vector2d(r.xmax, r.ymin) - a);
if (p1 * p0 <= 0.0)
{
return(true);
}
var p2 = Vector2d.Cross(ab, new Vector2d(r.xmin, r.ymax) - a);
if (p2 * p0 <= 0.0)
{
return(true);
}
var p3 = Vector2d.Cross(ab, new Vector2d(r.xmax, r.ymax) - a);
if (p3 * p0 <= 0.0)
{
return(true);
}
return(false);
}
/// <summary>
/// Is the bounding box intersects the given box?
/// </summary>
/// <param name="bb">The bounding box.</param>
/// <returns>Returns true if this bounding box intersects the given bounding box.</returns>
public bool Intersects(Box2d bb)
{
return(bb.xmax >= xmin && bb.xmin <= xmax && bb.ymax >= ymin && bb.ymin <= ymax);
}
/// <summary>
/// Is the bounding box contains the giveen bounding box?
/// </summary>
/// <param name="bb">The bounding box.</param>
/// <returns>Returns true if this bounding box contains the given bounding box.</returns>
public bool Contains(Box2d bb)
{
return(bb.xmin >= xmin && bb.xmax <= xmax && bb.ymin >= ymin && bb.ymax <= ymax);
}
/// <summary>
/// Enlarge the bounding box.
/// </summary>
/// <param name="bb">The bounding box.</param>
/// <returns>Returns the bounding box containing this box and the given box.</returns>
public Box2d Enlarge(Box2d bb)
{
return(new Box2d(Math.Min(xmin, bb.xmin), Math.Max(xmax, bb.xmax), Math.Min(ymin, bb.ymin), Math.Max(ymax, bb.ymax)));
}
