private void btnClearRedlines_Click(object sender, EventArgs e) { if (_redlineLayer != null) { _redlineLayer.DeleteFeatures(""); //Empty string means delete everything _viewer.RefreshMap(); MessageBox.Show("Redlines cleared"); } }
private void btnCreateBuffer_Click(object sender, EventArgs e) { MgSelectionBase selection = _viewer.GetSelection(); MgReadOnlyLayerCollection layers = selection.GetLayers(); if (layers == null) { MessageBox.Show("Select a parcel"); return; } MgLayerBase parcels = null; for (int i = 0; i < layers.GetCount(); i++) { MgLayerBase layer = layers.GetItem(i); if (layer.Name == "Parcels") { parcels = layer; break; } } if (parcels == null) { MessageBox.Show("Select a parcel"); return; } int bufferRingSize = 100; // measured in metres int bufferRingCount = 5; // Set up some objects for coordinate conversion MgMapBase map = _viewer.GetMap(); MgLayerCollection mapLayers = map.GetLayers(); MgMapViewerProvider provider = _viewer.GetProvider(); MgResourceService resourceService = (MgResourceService)provider.CreateService(MgServiceType.ResourceService); //Casting to MgdFeatureService because we want to use convenience APIs MgFeatureService featureService = (MgdFeatureService)provider.CreateService(MgServiceType.FeatureService); String mapWktSrs = map.GetMapSRS(); MgAgfReaderWriter agfReaderWriter = new MgAgfReaderWriter(); MgWktReaderWriter wktReaderWriter = new MgWktReaderWriter(); MgCoordinateSystemFactory coordinateSystemFactory = new MgCoordinateSystemFactory(); MgCoordinateSystem srs = coordinateSystemFactory.Create(mapWktSrs); MgMeasure srsMeasure = srs.GetMeasure(); string sessionId = Guid.NewGuid().ToString(); BufferHelper helper = new BufferHelper(); // Check for a buffer layer. If it exists, delete // the current features. // If it does not exist, create a feature source and // a layer to hold the buffer. MgdLayer bufferLayer = null; int layerIndex = mapLayers.IndexOf("Buffer"); if (layerIndex < 0) { // The layer does not exist and must be created. MgResourceIdentifier bufferFeatureResId = new MgResourceIdentifier("Session:" + sessionId + "//Buffer.FeatureSource"); helper.CreateBufferFeatureSource(featureService, mapWktSrs, bufferFeatureResId); bufferLayer = helper.CreateBufferLayer(resourceService, bufferFeatureResId, sessionId); mapLayers.Insert(0, bufferLayer); } else { bufferLayer = (MgdLayer)map.GetLayers().GetItem(layerIndex); bufferLayer.DeleteFeatures("ID like '%'"); } // Get the selected features from the MgSelection object MgFeatureReader featureReader = selection.GetSelectedFeatures(parcels, parcels.GetFeatureClassName(), false); // Process each item in the MgFeatureReader. Get the // geometries from all the selected features and // merge them into a single geometry. MgGeometryCollection inputGeometries = new MgGeometryCollection(); while (featureReader.ReadNext()) { MgByteReader featureGeometryData = featureReader.GetGeometry(parcels.GetFeatureGeometryName()); MgGeometry featureGeometry = agfReaderWriter.Read(featureGeometryData); inputGeometries.Add(featureGeometry); } MgGeometryFactory geometryFactory = new MgGeometryFactory(); MgGeometry mergedGeometries = geometryFactory.CreateMultiGeometry(inputGeometries); // Add buffer features to the temporary feature source. // Create multiple concentric buffers to show area. // If the stylization for the layer draws the features // partially transparent, the concentric rings will be // progressively darker towards the center. // The stylization is set in the layer template file, which // is used in function CreateBufferLayer(). for (int bufferRing = 0; bufferRing < bufferRingCount; bufferRing++) { double bufferDist = srs.ConvertMetersToCoordinateSystemUnits(bufferRingSize * (bufferRing + 1)); MgGeometry bufferGeometry = mergedGeometries.Buffer(bufferDist, srsMeasure); MgPropertyCollection properties = new MgPropertyCollection(); properties.Add(new MgGeometryProperty("BufferGeometry", agfReaderWriter.Write(bufferGeometry))); MgFeatureReader fr = bufferLayer.InsertFeatures(properties); fr.Close(); } bufferLayer.SetVisible(true); bufferLayer.ForceRefresh(); bufferLayer.SetDisplayInLegend(true); MessageBox.Show("Buffer created"); _viewer.RefreshMap(); IMapLegend legend = Shell.Instance.Legend; if (legend != null) { legend.RefreshLegend(); } }
private void btnFindFeaturesInBuffer_Click(object sender, EventArgs e) { MgSelectionBase selection = _viewer.GetSelection(); MgReadOnlyLayerCollection selectedLayers = selection.GetLayers(); if (selectedLayers == null) { MessageBox.Show("Select a parcel"); return; } MgLayerBase parcels = null; for (int i = 0; i < selectedLayers.GetCount(); i++) { MgLayerBase layer = selectedLayers.GetItem(i); if (layer.Name == "Parcels") { parcels = layer; break; } } if (parcels == null) { MessageBox.Show("Select a parcel"); return; } int bufferRingSize = 500; // measured in metres // Set up some objects for coordinate conversion MgMapBase map = _viewer.GetMap(); MgLayerCollection mapLayers = map.GetLayers(); MgMapViewerProvider provider = _viewer.GetProvider(); MgResourceService resourceService = (MgResourceService)provider.CreateService(MgServiceType.ResourceService); //Casting to MgdFeatureService because we want to use convenience APIs MgFeatureService featureService = (MgdFeatureService)provider.CreateService(MgServiceType.FeatureService); string sessionId = Guid.NewGuid().ToString(); String mapWktSrs = map.GetMapSRS(); MgAgfReaderWriter agfReaderWriter = new MgAgfReaderWriter(); MgWktReaderWriter wktReaderWriter = new MgWktReaderWriter(); MgCoordinateSystemFactory coordinateSystemFactory = new MgCoordinateSystemFactory(); MgCoordinateSystem srs = coordinateSystemFactory.Create(mapWktSrs); MgMeasure srsMeasure = srs.GetMeasure(); // Check for a buffer layer. If it exists, delete // the current features. // If it does not exist, create a feature source and // a layer to hold the buffer. BufferHelper helper = new BufferHelper(); MgdLayer bufferLayer = null; int layerIndex = map.GetLayers().IndexOf("Buffer"); if (layerIndex < 0) { // The layer does not exist and must be created. MgResourceIdentifier bufferFeatureResId = new MgResourceIdentifier("Session:" + sessionId + "//Buffer.FeatureSource"); helper.CreateBufferFeatureSource(featureService, mapWktSrs, bufferFeatureResId); bufferLayer = helper.CreateBufferLayer(resourceService, bufferFeatureResId, sessionId); map.GetLayers().Insert(0, bufferLayer); } else { bufferLayer = (MgdLayer)map.GetLayers().GetItem(layerIndex); bufferLayer.DeleteFeatures("ID like '%'"); } // Check for a parcel marker layer. If it exists, delete // the current features. // If it does not exist, create a feature source and // a layer to hold the parcel markers. MgdLayer parcelMarkerLayer = null; layerIndex = map.GetLayers().IndexOf("ParcelMarker"); if (layerIndex < 0) { MgResourceIdentifier parcelFeatureResId = new MgResourceIdentifier("Session:" + sessionId + "//ParcelMarker.FeatureSource"); helper.CreateParcelMarkerFeatureSource(featureService, mapWktSrs, parcelFeatureResId); parcelMarkerLayer = helper.CreateParcelMarkerLayer(resourceService, parcelFeatureResId, sessionId); map.GetLayers().Insert(0, parcelMarkerLayer); } else { parcelMarkerLayer = (MgdLayer)map.GetLayers().GetItem(layerIndex); parcelMarkerLayer.DeleteFeatures("ID like '%'"); } // Check each layer in the selection. for (int i = 0; i < selectedLayers.GetCount(); i++) { // Only check selected features in the Parcels layer. MgdLayer layer = (MgdLayer)selectedLayers.GetItem(i); if (layer.GetName() == "Parcels") { string geomName = layer.GetFeatureGeometryName(); System.Diagnostics.Trace.TraceInformation("Marking all parcels inside the buffer that are of type 'MFG'"); MgFeatureReader featureReader = selection.GetSelectedFeatures(layer, layer.GetFeatureClassName(), false); // Process each item in the MgFeatureReader. Get the // geometries from all the selected features and // merge them into a single geometry. MgGeometryCollection inputGeometries = new MgGeometryCollection(); while (featureReader.ReadNext()) { MgByteReader featureGeometryData = featureReader.GetGeometry(geomName); MgGeometry featureGeometry = agfReaderWriter.Read(featureGeometryData); inputGeometries.Add(featureGeometry); } MgGeometryFactory geometryFactory = new MgGeometryFactory(); MgGeometry mergedGeometries = geometryFactory.CreateMultiGeometry(inputGeometries); // Create a buffer from the merged geometries double bufferDist = srs.ConvertMetersToCoordinateSystemUnits(bufferRingSize); MgGeometry bufferGeometry = mergedGeometries.Buffer(bufferDist, srsMeasure); // Create a filter to select parcels within the buffer. Combine // a basic filter and a spatial filter to select all parcels // within the buffer that are of type "MFG". MgFeatureQueryOptions queryOptions = new MgFeatureQueryOptions(); queryOptions.SetFilter("RTYPE = 'MFG'"); queryOptions.SetSpatialFilter(geomName, bufferGeometry, MgFeatureSpatialOperations.Inside); featureReader = layer.SelectFeatures(queryOptions); // Get the features from the feature source, // determine the centroid of each selected feature, and // add a point to the ParcelMarker layer to mark the // centroid. // Collect all the points into an MgFeatureCommandCollection, // so they can all be added in one operation. MgFeatureCommandCollection parcelMarkerCommands = new MgFeatureCommandCollection(); int inserted = 0; while (featureReader.ReadNext()) { MgByteReader byteReader = featureReader.GetGeometry(geomName); MgGeometry geometry = agfReaderWriter.Read(byteReader); MgPoint point = geometry.GetCentroid(); // Create an insert command for this parcel. MgPropertyCollection properties = new MgPropertyCollection(); properties.Add(new MgGeometryProperty("ParcelLocation", agfReaderWriter.Write(point))); //parcelMarkerCommands.Add(new MgInsertFeatures("ParcelMarkerClass", properties)); MgFeatureReader fr = parcelMarkerLayer.InsertFeatures(properties); fr.Close(); inserted++; } featureReader.Close(); if (inserted == 0) { MessageBox.Show("No parcels within the buffer area match."); return; } // Create a feature in the buffer feature source to show the area covered by the buffer. MgPropertyCollection props = new MgPropertyCollection(); props.Add(new MgGeometryProperty("BufferGeometry", agfReaderWriter.Write(bufferGeometry))); bufferLayer.InsertFeatures(props); // Ensure that the buffer layer is visible and in the legend. bufferLayer.SetVisible(true); bufferLayer.ForceRefresh(); bufferLayer.SetDisplayInLegend(true); parcelMarkerLayer.SetVisible(true); parcelMarkerLayer.ForceRefresh(); MessageBox.Show("Done"); _viewer.RefreshMap(); IMapLegend legend = Shell.Instance.Legend; if (legend != null) { legend.RefreshLegend(); } } } }