int GetConnectionConflicts(IList <LabelState> lbls)
{
int ncon = 0;
int len = lbls.Count;
for (int i = 0; i < len; i++)
{
if (lbls[i].IsVisible)
{
for (int j = 0; j < len; j++)
{
if (i != j && lbls[j].IsVisible)
{
if (!LabelHelper.Intersect(lbls[i].Point, lbls[i].GetConnectingPoint(), lbls[j].Point, lbls[j].GetConnectingPoint()).IsEmpty())
{
lbls[i].Energy += wRectConflict;
lbls[j].Energy += wRectConflict;
ncon++;
}
}
}
}
}
return(ncon * wRectConflict);
}
// verify whether the current label position is good relatively to the other labels
static bool IsGoodPosition(LabelState lbl, Rect border, LabelState[] labels, IList <Rect> rects, int index)
{
// check border
if (!Contains(lbl, border))
{
return(false);
}
if (rects != null)
{
int cnt = rects.Count;
for (int i = 0; i < cnt; i++)
{
if (Intersect(lbl, rects[i]))
{
return(false);
}
}
}
// check other anchor points
int len = labels.Length;
for (int i = 0; i < len; i++)
{
if (i != index)
{
if (IntersectPoint(lbl, labels[i].Point))
{
return(false);
}
}
}
for (int i = 0; i < index; i++)
{
// check already placed labels
if (labels[i].IsVisible)
{
// label rectangle
if (Intersect(lbl, labels[i]))
{
return(false);
}
// connecting lines
if (!LabelHelper.Intersect(lbl.Point, lbl.GetConnectingPoint(), labels[i].Point, labels[i].GetConnectingPoint()).IsEmpty())
{
return(false);
}
}
}
return(true);
}
void Render()
{
if (!_loaded || UpdateCount > 0)
{
return;
}
if (Chart != null)
{
var prect = Chart.View.PlotRect;
var bnds = new Rect(0, 0, prect.Width, prect.Height);
bnds.Inflate(1, 1);
var offset = Chart.TranslatePoint(new Point(), (UIElement)this.Parent);
offset.X = prect.X - offset.X;
offset.Y = prect.Y - offset.Y;
foreach (var label in Children)
{
if (!base.Children.Contains(label))
{
base.Children.Add(label);
}
var line = label.ConnectingLine;
if (!base.Children.Contains(line))
{
base.Children.Add(line);
}
if (!Chart.ChartType.ToString().StartsWith("Pie"))
{
label.UpdateAttachPoint(Chart, offset);
if (bnds.Contains(label.AttachPoint))
{
label.Visibility = Visibility.Visible;
}
else
{
label.Visibility = Visibility.Collapsed;
}
}
else
{
label.UpdateAttachPoint(Chart, new Point());
}
}
if (LabelArranger != null)
{
LabelArranger.Arrange(Children.ToArray(), OccupiedRects, new Rect(0, 0, prect.Width, prect.Height));
}
foreach (var label in Children)
{
var line = label.ConnectingLine;
var pt = label.AttachPoint;
line.X1 = pt.X; line.Y1 = pt.Y;
var pt1 = LabelHelper.GetConnectingPoint(label);
if (!double.IsNaN(pt1.X) && !double.IsNaN(pt1.Y))
{
line.X2 = pt1.X; line.Y2 = pt1.Y;
}
}
_state = new ChartState(Chart);
}
}