/// <summary>
/// Gets the axis-aligned rectangle that completely containing the original rectangle, with no rotation.
/// </summary>
/// <param name="rectangle"></param>
public static PdfRectangle Normalise(this PdfRectangle rectangle)
{
var points = new[] { rectangle.BottomLeft, rectangle.BottomRight, rectangle.TopLeft, rectangle.TopRight };
return(new PdfRectangle(points.Min(p => p.X), points.Min(p => p.Y), points.Max(p => p.X), points.Max(p => p.Y)));
}
/// <summary>
/// Whether two rectangles overlap.
/// <para>Returns false if the two rectangles only share a border.</para>
/// </summary>
public static bool IntersectsWith(this PdfRectangle rectangle, PdfRectangle other)
{
if (Math.Abs(rectangle.Rotation) < epsilon && Math.Abs(other.Rotation) < epsilon)
{
if (rectangle.Left > other.Right || other.Left > rectangle.Right)
{
return(false);
}
if (rectangle.Top < other.Bottom || other.Top < rectangle.Bottom)
{
return(false);
}
return(true);
}
else
{
var r1 = rectangle.Normalise();
var r2 = other.Normalise();
if (Math.Abs(r1.Rotation) < epsilon && Math.Abs(r2.Rotation) < epsilon)
{
// check rotation to avoid stackoverflow
if (!r1.IntersectsWith(r2))
{
return(false);
}
}
if (rectangle.Contains(other.BottomLeft))
{
return(true);
}
if (rectangle.Contains(other.TopRight))
{
return(true);
}
if (rectangle.Contains(other.TopLeft))
{
return(true);
}
if (rectangle.Contains(other.BottomRight))
{
return(true);
}
if (other.Contains(rectangle.BottomLeft))
{
return(true);
}
if (other.Contains(rectangle.TopRight))
{
return(true);
}
if (other.Contains(rectangle.TopLeft))
{
return(true);
}
if (other.Contains(rectangle.BottomRight))
{
return(true);
}
if (IntersectsWith(rectangle.BottomLeft, rectangle.BottomRight, other.BottomLeft, other.BottomRight))
{
return(true);
}
if (IntersectsWith(rectangle.BottomLeft, rectangle.BottomRight, other.BottomRight, other.TopRight))
{
return(true);
}
if (IntersectsWith(rectangle.BottomLeft, rectangle.BottomRight, other.TopRight, other.TopLeft))
{
return(true);
}
if (IntersectsWith(rectangle.BottomLeft, rectangle.BottomRight, other.TopLeft, other.BottomLeft))
{
return(true);
}
if (IntersectsWith(rectangle.BottomRight, rectangle.TopRight, other.BottomLeft, other.BottomRight))
{
return(true);
}
if (IntersectsWith(rectangle.BottomRight, rectangle.TopRight, other.BottomRight, other.TopRight))
{
return(true);
}
if (IntersectsWith(rectangle.BottomRight, rectangle.TopRight, other.TopRight, other.TopLeft))
{
return(true);
}
if (IntersectsWith(rectangle.BottomRight, rectangle.TopRight, other.TopLeft, other.BottomLeft))
{
return(true);
}
if (IntersectsWith(rectangle.TopRight, rectangle.TopLeft, other.BottomLeft, other.BottomRight))
{
return(true);
}
if (IntersectsWith(rectangle.TopRight, rectangle.TopLeft, other.BottomRight, other.TopRight))
{
return(true);
}
if (IntersectsWith(rectangle.TopRight, rectangle.TopLeft, other.TopRight, other.TopLeft))
{
return(true);
}
if (IntersectsWith(rectangle.TopRight, rectangle.TopLeft, other.TopLeft, other.BottomLeft))
{
return(true);
}
if (IntersectsWith(rectangle.TopLeft, rectangle.BottomLeft, other.BottomLeft, other.BottomRight))
{
return(true);
}
if (IntersectsWith(rectangle.TopLeft, rectangle.BottomLeft, other.BottomRight, other.TopRight))
{
return(true);
}
if (IntersectsWith(rectangle.TopLeft, rectangle.BottomLeft, other.TopRight, other.TopLeft))
{
return(true);
}
if (IntersectsWith(rectangle.TopLeft, rectangle.BottomLeft, other.TopLeft, other.BottomLeft))
{
return(true);
}
return(false);
}
}
