/// <summary>
/// Sony NS @ 2013-08-06
/// </summary>
/// <param name="worldPos"></param>
/// <param name="limit"></param>
/// <param name="outLayer"></param>
/// <param name="condition"></param>
/// <returns></returns>
public IFeature FindNearestFeature(ICoordinate worldPos, float limit, out ILayer outLayer, Func <ILayer, bool> condition)
{
IFeature nearestFeature = null;
outLayer = null;
// Since we are only interested in one geometry object start with the topmost trackersLayer and stop
// searching the lower layers when an object is found.
// Sony NS @ 2013-08-06, order list ILayer Desc, karena untuk layer-layer symbol diload paling terakhir
foreach (ILayer mapLayer in Map.GetAllVisibleLayers(true).Reverse())
{
if (mapLayer is DiscreteGridPointCoverageLayer)
{
try
{
var curvilinearGridLayer = (DiscreteGridPointCoverageLayer)mapLayer;
var coverage = (IDiscreteGridPointCoverage)curvilinearGridLayer.Coverage;
var nearestFeatures = coverage.GetFeatures(worldPos.X, worldPos.Y, limit);
if (nearestFeatures != null)
{
if (!curvilinearGridLayer.ShowFaces)
{
nearestFeatures = nearestFeatures.Where(f => !(f is IGridFace));
}
if (!curvilinearGridLayer.ShowVertices)
{
nearestFeatures = nearestFeatures.Where(f => !(f is IGridVertex));
}
}
nearestFeature = nearestFeatures.FirstOrDefault();
outLayer = curvilinearGridLayer;
}
catch (Exception)
{
// GetCoordinateAtPosition will throw exception if x, y is not within the coverage
}
}
if (mapLayer is VectorLayer)
{
var vectorLayer = mapLayer as VectorLayer;
IEnvelope envelope;
float localLimit = limit;
if ((!vectorLayer.IsSelectable) || ((null != condition) && (!condition(vectorLayer))))
{
continue;
}
// Adjust the marge limit for Layers with a symbol style and if the size of the symbol exceeds
// the minimum limit. Ignore layers with custom renderers
if ((vectorLayer.Style.Symbol != null) && (0 == vectorLayer.CustomRenderers.Count))
{
ICoordinate size = MapHelper.ImageToWorld(MapControl.Map,
vectorLayer.Style.Symbol.Width,
vectorLayer.Style.Symbol.Height);
if ((size.X > localLimit) || (size.Y > localLimit))
{
envelope = MapHelper.GetEnvelope(worldPos, size.X, size.Y);
localLimit = (float)Math.Max(envelope.Width, envelope.Height);
}
else
{
envelope = GetEnvelope(worldPos, localLimit);
}
}
else
{
envelope = GetEnvelope(worldPos, localLimit);
}
IFeatureProvider featureProvider = vectorLayer.DataSource;
if (null != featureProvider)
{
// Get features in the envelope
IList objectsAt;
if (vectorLayer.CustomRenderers.Count > 0)
{
objectsAt = vectorLayer.CustomRenderers[0].GetFeatures(envelope, vectorLayer);
}
else
{
objectsAt = featureProvider.GetFeatures(envelope);
}
// Mousedown at new position
if (null != objectsAt)
{
IFeature feature = null;
if (objectsAt.Count == 1)
{
feature = objectsAt.OfType <IFeature>().First();
}
else if (objectsAt.Count > 1)
{
double localDistance;
feature = FindNearestFeature(vectorLayer, objectsAt, worldPos, localLimit, out localDistance);
}
if (null != feature)
{
nearestFeature = feature;
outLayer = vectorLayer;
break;
}
}
}
}
else if (mapLayer is IRegularGridCoverageLayer)
{
try
{
IRegularGridCoverageLayer regularGridCoverageLayer = (IRegularGridCoverageLayer)mapLayer;
IRegularGridCoverage regularGridCoverage = (IRegularGridCoverage)regularGridCoverageLayer.Coverage;
nearestFeature = regularGridCoverage.GetRegularGridCoverageCellAtPosition(worldPos.X, worldPos.Y);
outLayer = regularGridCoverageLayer;
}
catch (Exception)
{
// GetCoordinateAtPosition will throw exception if x, y is not within the coverage
}
}
}
return(nearestFeature);
}
public IFeature FindNearestFeature(ICoordinate worldPos, float limit, out ILayer outLayer,
Func <ILayer, bool> condition)
{
IFeature nearestFeature = null;
outLayer = null;
// Since we are only interested in one geometry object start with the topmost trackersLayer and stop
// searching the lower layers when an object is found.
foreach (ILayer mapLayer in MapHelper.GetAllMapLayers(Map.Layers, false))
{
if (mapLayer is VectorLayer)
{
var vectorLayer = mapLayer as VectorLayer;
IEnvelope envelope;
float localLimit = limit;
if ((!vectorLayer.IsSelectable) || ((null != condition) && (!condition(vectorLayer))))
{
continue;
}
// Adjust the marge limit for Layers with a symbol style and if the size of the symbol exceeds
// the minimum limit. Ignore layers with custom renderers
if ((vectorLayer.Style.Symbol != null) && (0 == vectorLayer.CustomRenderers.Count))
{
ICoordinate size = MapControlHelper.ImageToWorld(MapControl.Map, vectorLayer.Style.Symbol.Width,
vectorLayer.Style.Symbol.Height);
if ((size.X > localLimit) || (size.Y > localLimit))
{
envelope = MapControlHelper.GetEnvelope(worldPos, size.X, size.Y);
localLimit = (float)Math.Max(envelope.Width, envelope.Height);
}
else
{
envelope = GetEnvelope(worldPos, localLimit);
}
}
else
{
envelope = GetEnvelope(worldPos, localLimit);
}
IFeatureProvider featureProvider = vectorLayer.DataSource;
if (null != featureProvider)
{
// Get features in the envelope
IList objectsAt;
if (vectorLayer.CustomRenderers.Count > 0)
{
objectsAt = vectorLayer.CustomRenderers[0].GetFeatures(envelope, vectorLayer);
}
else
{
objectsAt = featureProvider.GetFeatures(envelope);
}
// Mousedown at new position
if ((null != objectsAt) && (objectsAt.Count > 0))
{
double localDistance;
IFeature feature = FindNearestFeature(vectorLayer, objectsAt, worldPos, localLimit,
out localDistance);
if (null != feature)
{
nearestFeature = feature;
outLayer = vectorLayer;
break;
}
}
}
}
else if (mapLayer is IRegularGridCoverageLayer)
{
try
{
IRegularGridCoverageLayer regularGridCoverageLayer = (IRegularGridCoverageLayer)mapLayer;
IRegularGridCoverage regularGridCoverage = (IRegularGridCoverage)regularGridCoverageLayer.Coverage;
nearestFeature = regularGridCoverage.GetRegularGridCoverageCellAtPosition(worldPos.X, worldPos.Y);
outLayer = regularGridCoverageLayer;
}
catch (Exception)
{
// GetCoordinateAtPosition will throw exception if x, y is not within the coverage
}
}
}
return(nearestFeature);
}
