WhichEdgesAreClose(ref Rectangle area1, ref Rectangle area2, int distance)
{
RectangleEdges result = RectangleEdges.None;
if ((Math.Abs(area1.Top - area2.Top) <= distance ||
Math.Abs(area1.Top - area2.Bottom) <= distance) &&
RangesCollide(area1.Left, area1.Right, area1.Left, area1.Right))
{
result |= RectangleEdges.Top;
}
if ((Math.Abs(area1.Bottom - area2.Bottom) <= distance ||
Math.Abs(area1.Bottom - area2.Top) <= distance) &&
RangesCollide(area1.Left, area1.Right, area1.Left, area1.Right))
{
result |= RectangleEdges.Bottom;
}
if ((Math.Abs(area1.Left - area2.Left) <= distance ||
Math.Abs(area1.Left - area2.Right) <= distance) &&
RangesCollide(area1.Top, area1.Bottom, area1.Top, area1.Bottom))
{
result |= RectangleEdges.Left;
}
if ((Math.Abs(area1.Right - area2.Right) <= distance ||
Math.Abs(area1.Right - area2.Left) <= distance) &&
RangesCollide(area1.Top, area1.Bottom, area1.Top, area1.Bottom))
{
result |= RectangleEdges.Right;
}
return(null);
}
public static Thickness <Points> CollapseEdges(this Thickness <Points> self, RectangleEdges edges)
{
return(self.With(
left: edges.HasFlag(RectangleEdges.Left) ? Optional.Some <Points>(0) : Optional.None(),
top: edges.HasFlag(RectangleEdges.Top) ? Optional.Some <Points>(0) : Optional.None(),
right: edges.HasFlag(RectangleEdges.Right) ? Optional.Some <Points>(0) : Optional.None(),
bottom: edges.HasFlag(RectangleEdges.Bottom) ? Optional.Some <Points>(0) : Optional.None()));
}
public static Thickness <Points> CollapseEdgesExcept(this Thickness <Points> self, RectangleEdges edges)
{
return(self.CollapseEdges(~edges));
}
public static void ClingToEdges(ref Rectangle areaToClingTo, ref Rectangle area, RectangleEdges edge, RectangleEdges edgeToClingTo)
{
if ((edge & RectangleEdges.Top) == RectangleEdges.Top)
{
area.Y = areaToClingTo.Y;
}
if ((edge & RectangleEdges.Bottom) == RectangleEdges.Bottom)
{
area.Y = areaToClingTo.Y + areaToClingTo.Height - area.Height;
}
if ((edge & RectangleEdges.Left) == RectangleEdges.Left)
{
area.X = areaToClingTo.X;
}
if ((edge & RectangleEdges.Right) == RectangleEdges.Right)
{
area.X = areaToClingTo.X + areaToClingTo.Width - area.Width;
}
}
public static void ClingToEdges(ref Rectangle areaToClingTo, ref Rectangle area, RectangleEdges edge, RectangleEdges edgeToClingTo)
{
if ((edge & RectangleEdges.Top) == RectangleEdges.Top)
{
area.Y = areaToClingTo.Y;
}
if ((edge & RectangleEdges.Bottom) == RectangleEdges.Bottom)
{
area.Y = areaToClingTo.Y + areaToClingTo.Height - area.Height;
}
if ((edge & RectangleEdges.Left) == RectangleEdges.Left)
{
area.X = areaToClingTo.X;
}
if ((edge & RectangleEdges.Right) == RectangleEdges.Right)
{
area.X = areaToClingTo.X + areaToClingTo.Width - area.Width;
}
}
