///// <summary>
///// snapping specific for a tool. Called before layer specific snappping is applied.
///// </summary>
///// <param name="sourceLayer"></param>
///// <param name="snapSource"></param>
///// <param name="worldPos"></param>
///// <param name="Envelope"></param>
///// <returns></returns>
public void Snap(ILayer sourceLayer, IGeometry snapSource, ICoordinate worldPos, IEnvelope Envelope)
{
SnapResult = null;
IFeature sourceFeature = MapControl.SelectTool.FeatureEditors[0].SourceFeature;
if (sourceFeature.Geometry != snapSource)
{
return;
}
SnapRole snapRole = SnapRole.FreeAtObject;
if ((Control.ModifierKeys & Keys.Control) == Keys.Control)
{
snapRole = SnapRole.Free;
}
ISnapRule snapRule = new SnapRule
{
SourceLayer = sourceLayer,
TargetLayer = sourceLayer,
Obligatory = true,
SnapRole = snapRole,
PixelGravity = 4
};
SnapResult = MapControl.SnapTool.ExecuteSnapRule(
snapRule,
sourceFeature,
sourceFeature.Geometry,
new List <IFeature>
{
sourceFeature
},
worldPos,
-1);
}
public ISnapResult Snap(ILayer layer, SnapRole snapRole, IGeometry snapSource, ICoordinate worldPos, IEnvelope envelope, int pixelGravity, IList <IFeature> snapTargets)
{
var targetVectorLayer = (VectorLayer)layer;
var snapCandidates = targetVectorLayer.DataSource.GetFeatures(envelope);
if (!layer.Enabled)
{
return(null);
}
// hack preserve snapTargets functionality
IList <IGeometry> snapTargetGeometries = new List <IGeometry>();
if (null != snapTargets)
{
for (int i = 0; i < snapTargets.Count; i++)
{
snapTargetGeometries.Add(snapTargets[i].Geometry);
}
}
double minDistance = double.MaxValue; // TODO: incapsulate minDistance in ISnapResult
ISnapResult snapResult = null;
foreach (IFeature feature in snapCandidates)
{
IGeometry geometry = feature.Geometry;
if ((null != snapTargets) && (snapTargetGeometries.IndexOf(geometry) == -1))
{
continue;
}
if (snapRole == SnapRole.None)
{
continue;
}
if (geometry is IPolygon)
{
IPolygon polygon = (IPolygon)geometry;
switch (snapRole)
{
case SnapRole.Free:
SnappingHelper.PolygonSnapFree(ref minDistance, ref snapResult, polygon, worldPos);
break;
default:
//case SnapRole.FreeAtObject:
SnappingHelper.PolygonSnapFreeAtObject(ref minDistance, ref snapResult, polygon, worldPos);
break;
}
}
if (geometry is ILineString)
{
ILineString lineString = (ILineString)geometry;
switch (snapRole)
{
case SnapRole.Free:
SnappingHelper.LineStringSnapFree(ref minDistance, ref snapResult, lineString, worldPos);
break;
case SnapRole.FreeAtObject:
SnappingHelper.LineStringSnapFreeAtObject(ref minDistance, ref snapResult, feature, lineString, worldPos);
break;
case SnapRole.TrackersNoStartNoEnd:
break;
case SnapRole.AllTrackers:
SnappingHelper.LineStringSnapAllTrackers(ref minDistance, ref snapResult, lineString, worldPos);
break;
case SnapRole.Start:
SnappingHelper.LineStringSnapStart(ref snapResult, lineString);
break;
case SnapRole.End:
SnappingHelper.LineStringSnapEnd(ref snapResult, lineString);
break;
case SnapRole.StartEnd:
SnappingHelper.LineStringSnapStartEnd(ref minDistance, ref snapResult, lineString, worldPos);
break;
}
}
else if (geometry is IPoint)
{
SnappingHelper.PointSnap(ref snapResult, geometry);
}
} // foreach (IGeometry geometry in snapCandidates)
return(snapResult);
}
public ISnapResult Snap(ILayer layer, SnapRole snapRole, IGeometry snapSource, ICoordinate worldPos, IEnvelope envelope, int pixelGravity, IList<IFeature> snapTargets)
{
var targetVectorLayer = (VectorLayer)layer;
var snapCandidates = targetVectorLayer.DataSource.GetFeatures(envelope);
if (!layer.Enabled)
return null;
// hack preserve snapTargets functionality
IList<IGeometry> snapTargetGeometries = new List<IGeometry>();
if (null != snapTargets)
{
for (int i = 0; i < snapTargets.Count; i++)
{
snapTargetGeometries.Add(snapTargets[i].Geometry);
}
}
double minDistance = double.MaxValue; // TODO: incapsulate minDistance in ISnapResult
ISnapResult snapResult = null;
foreach (IFeature feature in snapCandidates)
{
IGeometry geometry = feature.Geometry;
if ((null != snapTargets) && (snapTargetGeometries.IndexOf(geometry) == -1))
continue;
if (snapRole == SnapRole.None)
continue;
if (geometry is IPolygon)
{
IPolygon polygon = (IPolygon)geometry;
switch (snapRole)
{
case SnapRole.Free:
SnappingHelper.PolygonSnapFree(ref minDistance, ref snapResult, polygon, worldPos);
break;
default:
//case SnapRole.FreeAtObject:
SnappingHelper.PolygonSnapFreeAtObject(ref minDistance, ref snapResult, polygon, worldPos);
break;
}
}
if (geometry is ILineString)
{
ILineString lineString = (ILineString)geometry;
switch (snapRole)
{
case SnapRole.Free:
SnappingHelper.LineStringSnapFree(ref minDistance, ref snapResult, lineString, worldPos);
break;
case SnapRole.FreeAtObject:
SnappingHelper.LineStringSnapFreeAtObject(ref minDistance, ref snapResult, feature, lineString, worldPos);
break;
case SnapRole.TrackersNoStartNoEnd:
break;
case SnapRole.AllTrackers:
SnappingHelper.LineStringSnapAllTrackers(ref minDistance, ref snapResult, lineString, worldPos);
break;
case SnapRole.Start:
SnappingHelper.LineStringSnapStart(ref snapResult, lineString);
break;
case SnapRole.End:
SnappingHelper.LineStringSnapEnd(ref snapResult, lineString);
break;
case SnapRole.StartEnd:
SnappingHelper.LineStringSnapStartEnd(ref minDistance, ref snapResult, lineString, worldPos);
break;
}
}
else if (geometry is IPoint)
{
SnappingHelper.PointSnap(ref snapResult, geometry);
}
} // foreach (IGeometry geometry in snapCandidates)
return snapResult;
}
