internal static Point CenterPoint(this Rect rect)
{
return(PointExt.MidPoint(rect.TopLeft, rect.BottomRight));
}
private Point?GetPointOnTarget(Point sourceMidPoint, Rect target)
{
switch (this.Vertical)
{
case VerticalPlacement.Auto:
switch (this.Horizontal)
{
case HorizontalPlacement.Auto:
var closestLine = ClosestLine(target, sourceMidPoint);
return(AutoPoint(sourceMidPoint.LineTo(target.CenterPoint()), closestLine));
case HorizontalPlacement.Left:
return(AutoPoint(sourceMidPoint.LineTo(target.CenterPoint()), target.LeftLine()));
case HorizontalPlacement.Center:
return(sourceMidPoint.Closest(target.BottomLine(), target.TopLine())
.MidPoint);
case HorizontalPlacement.Right:
return(AutoPoint(sourceMidPoint.LineTo(target.CenterPoint()), target.RightLine()));
default:
throw new ArgumentOutOfRangeException();
}
case VerticalPlacement.Top:
switch (this.Horizontal)
{
case HorizontalPlacement.Auto:
return(AutoPoint(sourceMidPoint.LineTo(target.CenterPoint()), target.TopLine()));
case HorizontalPlacement.Left:
return(target.TopLeft);
case HorizontalPlacement.Center:
return(PointExt.MidPoint(target.TopLeft, target.TopRight));
case HorizontalPlacement.Right:
return(target.TopRight);
default:
throw new ArgumentOutOfRangeException();
}
case VerticalPlacement.Center:
switch (this.Horizontal)
{
case HorizontalPlacement.Auto:
return(sourceMidPoint.Closest(target.LeftLine(), target.RightLine())
.MidPoint);
case HorizontalPlacement.Left:
return(PointExt.MidPoint(target.BottomLeft, target.TopLeft));
case HorizontalPlacement.Center:
return(PointExt.MidPoint(target.TopLeft, target.BottomRight));
case HorizontalPlacement.Right:
return(PointExt.MidPoint(target.BottomRight, target.TopRight));
default:
throw new ArgumentOutOfRangeException();
}
case VerticalPlacement.Bottom:
switch (this.Horizontal)
{
case HorizontalPlacement.Auto:
return(AutoPoint(sourceMidPoint.LineTo(target.CenterPoint()), target.BottomLine()));
case HorizontalPlacement.Left:
return(target.BottomLeft);
case HorizontalPlacement.Center:
return(PointExt.MidPoint(target.BottomLeft, target.BottomRight));
case HorizontalPlacement.Right:
return(target.BottomRight);
default:
throw new ArgumentOutOfRangeException();
}
default:
throw new ArgumentOutOfRangeException();
}
}