/// <summary>
/// Determine the size of the union of the bounds of the positioned and rotated child elements.
/// </summary>
/// <param name="availableSize"></param>
/// <returns></returns>
protected override Size MeasureOverride(Size availableSize)
{
Part part = Diagram.FindAncestor <Part>(this);
if (part == null)
{
return(new Size());
}
if (!part.IsMeasuringArranging)
{
return(new Size());
}
Link link = part as Link;
if (link == null)
{
Adornment ad = part as Adornment;
if (ad != null)
{
link = ad.AdornedPart as Link;
}
if (link == null)
{
return(new Size());
}
}
//Diagram.Debug(" LinkPanelM- " + (link.Data != null ? link.Data.ToString() : ""));
Shape stroke = this.Path; // may be null
link.Path = stroke; // the Link caches what the Path really is
Route route = link.Route;
Rect routeBounds = route.RouteBounds; // in model coordinates
Rect linkBounds = routeBounds; // includes all labels
childrenBounds = new List <Rect>(); // in local coordinates
if (stroke != null)
{
stroke.Measure(Geo.Unlimited);
Size sz = stroke.DesiredSize;
linkBounds.Width = Math.Max(linkBounds.Width, sz.Width);
linkBounds.Height = Math.Max(linkBounds.Height, sz.Height);
childrenBounds.Add(new Rect(0, 0, linkBounds.Width, linkBounds.Height));
}
IList <Point> pts = (List <Point>)route.Points;
int nPoints = pts.Count;
foreach (UIElement e in this.Children)
{
if (e == stroke)
{
continue; // already measured the stroke, above
}
e.Measure(Geo.Unlimited);
//if (e.GetType().Name.Contains("Expander")) Diagram.Debug(e.ToString() + " measured: " + Diagram.Str(e.DesiredSize));
if (nPoints < 2)
{
continue;
}
Size sz = e.DesiredSize;
int index = GetIndex(e);
double frac = ComputeFraction(GetFraction(e));
Spot align = GetAlignment(e);
if (align.IsNoSpot)
{
align = Spot.Center;
}
LabelOrientation orient = GetOrientation(e);
Point eltpt; // local coordinates
if (index < -nPoints || index >= nPoints) // beyond range? assume at the MidPoint, with the MidAngle
{
Point mid = route.MidPoint;
if (this.Implementation == LinkPanelImplementation.Stretch)
{
Point p0 = pts[0];
Point pn = pts[nPoints - 1];
sz.Width = Math.Sqrt(Geo.DistanceSquared(pn, p0));
}
double segangle = route.MidAngle;
// maybe rotate the label
double labelangle = 0;
if (orient != LabelOrientation.None)
{
labelangle = ComputeAngle(e, orient, segangle);
link.SetAngle(e, labelangle, align);
}
// maybe the alignment point is away from the line
eltpt = new Point(mid.X - routeBounds.X, mid.Y - routeBounds.Y); // local coordinates
Point offset = ComputeOffset(e, index, segangle, sz, labelangle);
eltpt = Geo.Add(eltpt, offset);
}
else // on a particular segment, given by Index, at a point given by Fraction
// negative index means start from last point, going "backwards"
{
Point a, b;
if (index >= 0)
{
a = pts[index];
b = (index < nPoints - 1) ? pts[index + 1] : a;
}
else
{
int i = nPoints + index; // remember that index is negative here
a = pts[i];
b = (i > 0) ? pts[i - 1] : a;
}
// compute the fractional point along the line, in local coordinates
eltpt = new Point(a.X + (b.X - a.X) * frac - routeBounds.X, a.Y + (b.Y - a.Y) * frac - routeBounds.Y);
double segangle = (index >= 0 ? Geo.GetAngle(a, b) : Geo.GetAngle(b, a));
// maybe rotate the label
double labelangle = 0;
if (orient != LabelOrientation.None)
{
labelangle = ComputeAngle(e, orient, segangle);
link.SetAngle(e, labelangle, align);
}
// maybe the alignment point is away from the line
Point offset = ComputeOffset(e, index, segangle, sz, labelangle);
eltpt = Geo.Add(eltpt, offset);
}
Rect cb = align.RectForPoint(eltpt, sz);
childrenBounds.Add(cb); // local coordinates
linkBounds.Union(new Rect(cb.X + routeBounds.X, cb.Y + routeBounds.Y, cb.Width, cb.Height)); // model coordinates
}
// if this panel is the "whole" link, update the link's Bounds
if (link.VisualElement == this)
{
//Diagram.Debug(" LinkPanelM+ " + (link.Data != null ? link.Data.ToString() : "") + " " + Diagram.Str(routeBounds) + Diagram.Str(linkBounds));
link.Bounds = new Rect(routeBounds.X, routeBounds.Y, linkBounds.Width, linkBounds.Height);
}
return(new Size(routeBounds.Width, routeBounds.Height));
}
