///<inheritdoc/>
public virtual IEnumerable <ILabelModelParameter> GetParameters(ILabel label, ILabelModel model)
{
SliderEdgeLabelModel sliderEdgeLabelModel = (SliderEdgeLabelModel)model;
List <ILabelModelParameter> result = new List <ILabelModelParameter>();
IEdge edge = (IEdge)label.Owner;
IPathGeometry geometry = GetPathGeometry(edge);
if (geometry != null)
{
int count = geometry.GetSegmentCount();
for (int i = 0; i < count; i++)
{
result.Add(sliderEdgeLabelModel.CreateParameterFromSource(i, 0));
result.Add(sliderEdgeLabelModel.CreateParameterFromSource(i, 0.5));
result.Add(sliderEdgeLabelModel.CreateParameterFromSource(i, 1));
}
}
return(result);
}
public void SetAnchor(SliderEdgeLabelModel labelModel, IEdge edge, OrientedRectangle geometry)
{
IPathGeometry pathGeometry = GetPathGeometry(edge);
if (pathGeometry != null)
{
int count = pathGeometry.GetSegmentCount();
int index = segmentIndex;
if (index >= count)
{
index = count - 1;
}
if (index < 0)
{
index = count + index;
}
if (index < 0)
{
index = 0;
}
else if (index >= count)
{
index = count - 1;
}
double thisRatio = ratio;
var validTangent = pathGeometry.GetTangent(index, thisRatio);
if (validTangent.HasValue)
{
var p = validTangent.Value.Point;
var t = validTangent.Value.Vector;
AnchorGeometry(geometry, labelModel.EdgeRelativeDistance, labelModel.Distance, p.X, p.Y, thisRatio, t.X, t.Y);
return;
}
}
geometry.Width = -1;
geometry.Height = -1;
}