private void MagnetBot(object source, BaseShape other)
{
if (other == null)
{
return;
}
//determine relationship for pivot and its new head.
if (other.IsTail())
{
//other is a single
//calculate the position of pivot.
_pivot.X = other.X;
var delta = Math.Abs(other.InnerLowerY + 8.8 - _pivot.Y);
_pivot.Y = other.InnerLowerY + 8.8;
//calculate the next shape head by pivot.
_pivot.DoAllWithoutHead(i =>
{
i.X = other.X;
i.Y -= delta;
});
}
else
{
// when drag pivot in middle of two shape
//calculate the position of pivot.
_pivot.X = other.X;
var delta = Math.Abs(other.InnerLowerY + 8.8 - _pivot.Y);
_pivot.Y = other.InnerLowerY + 8.8;
double totalHeight = 0;
_pivot.DoAllWithoutHead(i =>
{
i.X = other.X;
i.Y -= delta;
totalHeight += i.Height + 8.8;
});
other.Next.Y += totalHeight;
//calculate the next shape head by pivot.
var next = other.Next;
next.Prev = _pivot.GetTail();
_pivot.GetTail().Next = next;
}
other.Next = _pivot;
_pivot.Prev = other;
_pivot.StrokeColor = Transparent;
other.StrokeColor = Transparent;
_previousState.Clear();
}