/// <summary>
/// Returns a rectangle enclosing the corner points of the current instance, rotated
/// by the specified amount.
/// </summary>
public RectangleD Rotate(Angle angle)
{
if (angle.IsEmpty)
{
return(this);
}
// Rotate each corner point
PointD[] Points = new PointD[] { UpperLeft.RotateAt(angle, Center),
UpperRight.RotateAt(angle, Center),
LowerRight.RotateAt(angle, Center),
LowerLeft.RotateAt(angle, Center) };
// Now return the smallest rectangle which encloses these points
return(RectangleD.FromArray(Points));
}
/// <summary>
/// Returns a rectangle enclosing the corner points of the current instance, rotated
/// by the specified amount around a specific point.
/// </summary>
/// <returns>A new <strong>RectangleD</strong> containing the rotated rectangle.</returns>
/// <remarks><para>When a rectangle is rotated, the total width and height it occupies may be larger
/// than the rectangle's own width and height. This method calculates the smallest rectangle
/// which encloses the rotated rectangle.</para>
/// <para>[TODO: Include before and after picture; this is confusing.]</para>
/// </remarks>
public RectangleD RotateAt(Angle _angle, PointD _center)
{
if (_angle.IsEmpty)
{
return(this);
}
// Rotate each corner point
PointD[] points =
{
UpperLeft.RotateAt(_angle, _center),
UpperRight.RotateAt(_angle, _center),
LowerRight.RotateAt(_angle, _center),
LowerLeft.RotateAt(_angle, _center)
};
// Now return the smallest rectangle which encloses these points
return(FromArray(points));
}