//1397.08.26
//why this methods calls multiple time. enable break point to see why
private void UpdateEdgeLables()
{
this._edgeLabelLayer.Items.Clear();
//if (this._webMercatorGeometry?.GetAllPoints().Length <= 1)
////if (this._webMercatorGeometry.NumberOfPoints <= 1 || temp <= 1)
//{
// return;
//}
if (Options.IsEdgeLabelVisible)
{
var edges = _webMercatorGeometry.GetLineSegments().Select(i => ToEdgeLengthLocatable(i.Start, i.End));
foreach (var item in edges)
{
_edgeLabelLayer.Items.Add(item);
}
}
if (Options.IsMeasureVisible)
{
var point = this._webMercatorGeometry?.GetMeanOrLastPoint();
if (point == null)
{
return;
}
var element = new View.MapMarkers.RectangleLabelMarker(MeasureLabel);
//do not show length/area when geometry has just one/two point or new part has just one/two point
if (double.IsNaN(MeasureValue))
{
return;
}
element.TooltipValue = MeasureValue.ToInvariantString();
var offset = _screenToMap(20);
_edgeLabelLayer.Items.Add(new Locateable(Model.AncherFunctionHandlers.BottomCenter)
{
Element = element,
X = point.X + offset,
Y = point.Y + offset
});
}
}
private Locateable ToEdgeLengthLocatable(Point first, Point second)
{
Func <Point, Point> toGeodeticWgs84 = p => MapProjects.WebMercatorToGeodeticWgs84(p);
var edge = new LineSegment <Point>(first, second);
var element = new View.MapMarkers.RectangleLabelMarker(edge.GetLengthLabel(toGeodeticWgs84));
//var offset = _screenToMap(15);
return(new Locateable(Model.AncherFunctionHandlers.BottomCenter)
{
Element = element, X = edge.Middle.X, Y = edge.Middle.Y
});
}
