/// <summary>
/// Automaticaly update edge label position
/// </summary>
public virtual void UpdatePosition()
{
if (double.IsNaN(DesiredSize.Width) || DesiredSize.Width == 0)
{
return;
}
if (EdgeControl == null)
{
return;
}
if (EdgeControl.Source == null || EdgeControl.Target == null)
{
Debug.WriteLine("EdgeLabelControl_LayoutUpdated() -> Got empty edgecontrol!");
return;
}
//if hidden
if (Visibility != Visibility.Visible)
{
return;
}
if (EdgeControl.IsSelfLooped)
{
var idesiredSize = DesiredSize;
var pt = EdgeControl.Source.GetCenterPosition();
SetSelfLoopedSize(pt, idesiredSize);
Arrange(LastKnownRectSize);
return;
}
var p1 = EdgeControl.SourceConnectionPoint.GetValueOrDefault();
var p2 = EdgeControl.TargetConnectionPoint.GetValueOrDefault();
double edgeLength = 0;
var routingInfo = EdgeControl.Edge as IRoutingInfo;
if (routingInfo != null)
{
var routePoints = routingInfo.RoutingPoints == null ? null : routingInfo.RoutingPoints.ToWindows();
if (routePoints == null || routePoints.Length == 0)
{
// the edge is a single segment (p1,p2)
edgeLength = GetLabelDistance(MathHelper.GetDistanceBetweenPoints(p1, p2));
}
else
{
// the edge has one or more segments
// compute the total length of all the segments
edgeLength = 0;
var rplen = routePoints.Length;
for (var i = 0; i <= rplen; ++i)
{
if (i == 0)
{
edgeLength += MathHelper.GetDistanceBetweenPoints(p1, routePoints[0]);
}
else if (i == rplen)
{
edgeLength += MathHelper.GetDistanceBetweenPoints(routePoints[rplen - 1], p2);
}
else
{
edgeLength += MathHelper.GetDistanceBetweenPoints(routePoints[i - 1], routePoints[i]);
}
}
// find the line segment where the half distance is located
edgeLength = GetLabelDistance(edgeLength);
var newp1 = p1;
var newp2 = p2;
for (var i = 0; i <= rplen; ++i)
{
double lengthOfSegment;
if (i == 0)
{
lengthOfSegment = MathHelper.GetDistanceBetweenPoints(newp1 = p1, newp2 = routePoints[0]);
}
else if (i == rplen)
{
lengthOfSegment = MathHelper.GetDistanceBetweenPoints(newp1 = routePoints[rplen - 1], newp2 = p2);
}
else
{
lengthOfSegment = MathHelper.GetDistanceBetweenPoints(newp1 = routePoints[i - 1], newp2 = routePoints[i]);
}
if (lengthOfSegment >= edgeLength)
{
break;
}
edgeLength -= lengthOfSegment;
}
// redefine our edge points
p1 = newp1;
p2 = newp2;
}
}
// The label control should be laid out on a rectangle, in the middle of the edge
var angleBetweenPoints = MathHelper.GetAngleBetweenPoints(p1, p2);
var desiredSize = DesiredSize;
bool flipAxis = p1.X > p2.X; // Flip axis if source is "after" target
ApplyLabelHorizontalOffset(edgeLength, LabelHorizontalOffset);
// Calculate the center point of the edge
var centerPoint = new Point(p1.X + edgeLength * Math.Cos(angleBetweenPoints), p1.Y - edgeLength * Math.Sin(angleBetweenPoints));
if (AlignToEdge)
{
// If we're aligning labels to the edges make sure add the label vertical offset
var yEdgeOffset = LabelVerticalOffset;
if (FlipOnRotation && flipAxis && !EdgeControl.IsParallel) // If we've flipped axis, move the offset to the other side of the edge
{
yEdgeOffset = -yEdgeOffset;
}
// Adjust offset for rotation. Remember, the offset is perpendicular from the edge tangent.
// Slap on 90 degrees to the angle between the points, to get the direction of the offset.
centerPoint.Y -= yEdgeOffset * Math.Sin(angleBetweenPoints + Math.PI / 2);
centerPoint.X += yEdgeOffset * Math.Cos(angleBetweenPoints + Math.PI / 2);
// Angle is in degrees
Angle = -angleBetweenPoints * 180 / Math.PI;
if (flipAxis)
{
Angle += 180; // Reorient the label so that it's always "pointing north"
}
}
UpdateFinalPosition(centerPoint, desiredSize);
#if METRO
GraphAreaBase.SetX(this, LastKnownRectSize.X, true);
GraphAreaBase.SetY(this, LastKnownRectSize.Y, true);
#else
Arrange(LastKnownRectSize);
#endif
}
private Point UpdateTargetEpData(Point from, Point to)
{
var dir = MathHelper.GetDirection(from, to);
var result = EdgePointerForTarget.Update(from, dir, EdgePointerForTarget.NeedRotation ? (-MathHelper.GetAngleBetweenPoints(from, to).ToDegrees()) : 0);
return(EdgePointerForTarget.Visibility == Visibility.Visible ? result : new Point());
}
private Point UpdateTargetEpData(Point from, Point to, bool allowUnsuppress = true)
{
var dir = MathHelper.GetDirection(from, to);
if (from == to)
{
if (HideEdgePointerOnVertexOverlap)
{
EdgePointerForTarget.Suppress();
}
else
{
dir = new Vector(0, 0);
}
}
else if (allowUnsuppress)
{
EdgePointerForTarget.UnSuppress();
}
var result = EdgePointerForTarget.Update(from, dir, EdgePointerForTarget.NeedRotation ? (-MathHelper.GetAngleBetweenPoints(from, to).ToDegrees()) : 0);
return(EdgePointerForTarget.Visibility == Visibility.Visible ? result : new Point());
}