protected override Point GetExpectedConnectLocationForConnectedAnchor(
IAnchor anchor, Rectangle oldBounds, Rectangle newBounds
)
{
if (oldBounds == newBounds)
{
return(anchor.Location);
}
var isMoveOnly = oldBounds.Size == newBounds.Size;
if (isMoveOnly)
{
var locDelta = newBounds.Location - (Size)oldBounds.Location;
return(anchor.Location + (Size)locDelta);
}
var leftDelta = newBounds.Left - oldBounds.Left;
var topDelta = newBounds.Top - oldBounds.Top;
var rightDelta = newBounds.Right - oldBounds.Right;
var bottomDelta = newBounds.Bottom - oldBounds.Bottom;
var dir = RectUtil.GetDirectionFromCenter(oldBounds, anchor.Location);
//var dir = RectUtil.GetDirectionStraightlyFromCenter(oldBounds, anchor.Location);
var newCenter = RectUtil.GetCenter(newBounds);
var newLoc = anchor.Location;
if (EnumUtil.HasAllFlags((int)dir, (int)Directions.Left))
{
newLoc.X = Math.Min(newLoc.X + leftDelta, newCenter.X);
}
if (EnumUtil.HasAllFlags((int)dir, (int)Directions.Right))
{
newLoc.X = Math.Max(newLoc.X + rightDelta, newCenter.X);
}
if (EnumUtil.HasAllFlags((int)dir, (int)Directions.Up))
{
newLoc.Y = Math.Min(newLoc.Y + topDelta, newCenter.Y);
}
if (EnumUtil.HasAllFlags((int)dir, (int)Directions.Down))
{
newLoc.Y = Math.Max(newLoc.Y + bottomDelta, newCenter.Y);
}
using (_ResourceCache.UseResource()) {
var path = _OutlinePathResouce;
var pts = path.PathPoints;
var ptAndDists = new List <Tuple <Point, int> >();
for (int i = 0, len = pts.Length; i < len; ++i)
{
var pt1 = Point.Round(pts[i]);
var pt2 = Point.Round(i + 1 < len ? pts[i + 1] : pts[0]);
if (pt1 != pt2)
{
var pathPortion = new Line(pt1, pt2);
var npt = pathPortion.GetNearestPointFrom(newLoc);
var dist = pathPortion.GetDistance(newLoc);
ptAndDists.Add(Tuple.Create(npt, dist));
}
}
return(ptAndDists.Count == 0? Point.Empty: ptAndDists.FindMin(t => t.Item2).Item1);
}
}
