private IEnumerable<DiagramElement> DrawLine(DiagramElement fromElement, DiagramElement destinationElement, Association destinationAssociation)
{
Logger.Instance.WriteEntry("DrawLine for {0}", destinationAssociation.AssociatedTo.Name);
Logger.Instance.WriteEntry(" From Area: {0}", fromElement.Area);
Logger.Instance.WriteEntry(" To Area : {0}", destinationElement.Area);
ConnectionLine route = ConnectionLine.FindBestConnectionRoute(fromElement.Area, destinationElement.Area, IsOverlappingWithOtherControls);
destinationAssociation.StyleLine(route);
var addedElements = new List<DiagramElement>();
Logger.Instance.WriteEntry(" Route calculated from {0:F1}, {1:F1} to {2:F1}, {3:F1}", route.From.X, route.From.Y, route.To.X, route.To.Y);
Logger.Instance.WriteEntry(" From angle {0:F1} to angle {1:F1}", route.FromAngle, route.ToAngle);
// Create the line diagram element and add to the diagram collection.
// The line is linked to the arrow head position.
var lineDiagramElement = new DiagramElement(DiagramId, route) { TopLeft = route.From };
lineDiagramElement.RegisterPositionDependency(new[] { fromElement, destinationElement }, IsOverlappingWithOtherControls);
addedElements.Add(lineDiagramElement);
// Create an arrow head based on the best route and add to the diagram collection.
// The arrow head is linked to the associate diagram element.
ArrowHead arrowHead = destinationAssociation.CreateLineHead();
var headDiagramElement = new DiagramElement(DiagramId, arrowHead) { TopLeft = route.To };
headDiagramElement.RegisterPositionDependency(new[] { lineDiagramElement }, IsOverlappingWithOtherControls);
addedElements.Add(headDiagramElement);
return new[] { lineDiagramElement, headDiagramElement };
}
