RSSWeatherLayerClass.cs
// Copyright 2010 ESRI // // All rights reserved under the copyright laws of the United States // and applicable international laws, treaties, and conventions. // // You may freely redistribute and use this sample code, with or // without modification, provided you include the original copyright // notice and use restrictions. // // See the use restrictions. // using System; using System.Collections; using System.Data; using System.Runtime.InteropServices; using System.Xml; using System.Threading; using System.Timers; using System.Text.RegularExpressions; using System.IO; using System.Drawing; using System.Drawing.Imaging; using System.Windows.Forms; using System.ComponentModel; using Microsoft.Win32; using ESRI.ArcGIS.ADF.BaseClasses; using ESRI.ArcGIS.Carto; using ESRI.ArcGIS.Geodatabase; using ESRI.ArcGIS.esriSystem; using ESRI.ArcGIS.Geometry; using ESRI.ArcGIS.Display; using ESRI.ArcGIS.DataSourcesFile; namespace RSSWeatherLayer { #region WeatherItemEventArgs class members public sealed class WeatherItemEventArgs : EventArgs { private int m_id; private long m_zipCode; private double m_x; private double m_y; private int m_iconWidth; private int m_iconHeight; public WeatherItemEventArgs(int id, long zipCode, double X, double Y, int iconWidth, int iconHeight) { m_id = id; m_zipCode = zipCode; m_x = X; m_y = Y; m_iconWidth = iconWidth; m_iconHeight = iconHeight; } public int ID { get { return m_id; } } public long ZipCode { get { return m_zipCode; } } public double mapY { get { return m_y; } } public double mapX { get { return m_x; } } public int IconWidth { get { return m_iconWidth; } } public int IconHeight { get { return m_iconHeight; } } } #endregion //declare delegates for the event handling public delegate void WeatherItemAdded(object sender, WeatherItemEventArgs args); public delegate void WeatherItemsUpdated(object sender, EventArgs args); /// <summary> /// RSSWeatherLayerClass is a custom layer for ArcMap/MapControl. It inherits CustomLayerBase /// which implements the relevant interfaces required by the Map. /// This sample is a comprehensive sample of a real life scenario for creating a new layer in /// order to consume a web service and display the information in a map. /// In this sample you can find implementation of simple editing capabilities, selection by /// attribute and by location, persistence and identify. /// </summary> [Guid("3460FB55-4326-4d28-9F96-D62211B0C754")] [ClassInterface(ClassInterfaceType.None)] [ComVisible(true)] [ProgId("RSSWeatherLayer.RSSWeatherLayerClass")] public sealed class RSSWeatherLayerClass : BaseDynamicLayer, IIdentify { #region class members private System.Timers.Timer m_timer = null; private Thread m_updateThread = null; private string m_iconFolder = string.Empty; private DataTable m_table = null; private DataTable m_symbolTable = null; private DataTable m_locations = null; private ISymbol m_selectionSymbol = null; private IDisplay m_display = null; private string m_dataFolder = string.Empty; private int m_layerSRFactoryCode = 0; private int m_symbolSize = 32; private IPoint m_point = null; private IPoint m_llPnt = null; private IPoint m_urPnt = null; private IEnvelope m_env = null; // dynamic display members private IDynamicGlyphFactory2 m_dynamicGlyphFactory = null; private IDynamicSymbolProperties2 m_dynamicSymbolProperties = null; private IDynamicCompoundMarker2 m_dynamicCompoundMarker = null; private IDynamicGlyph m_textGlyph = null; private IDynamicGlyph m_selectionGlyph = null; private bool m_bDDOnce = true; //weather items events public event WeatherItemAdded OnWeatherItemAdded; public event WeatherItemsUpdated OnWeatherItemsUpdated; #endregion #region Constructor /// <summary> /// The class has only default CTor. /// </summary> public RSSWeatherLayerClass() : base() { try { //set the layer's name base.m_sName = "RSS Weather Layer"; //ask the Map to create a separate cache for the layer base.m_IsCached = false; // the underlying data for this layer is always in WGS1984 geographical coordinate system m_spatialRef = CreateGeographicSpatialReference(); m_layerSRFactoryCode = m_spatialRef.FactoryCode; //get the directory for the layer's cache. If it does not exist, create it. m_dataFolder = System.IO.Path.Combine(System.IO.Path.GetTempPath(), "RSSWeatherLayer"); if (!System.IO.Directory.Exists(m_dataFolder)) { System.IO.Directory.CreateDirectory(m_dataFolder); } m_iconFolder = m_dataFolder; //instantiate the timer for the weather update m_timer = new System.Timers.Timer(1000); m_timer.Enabled = false; m_timer.Elapsed += new ElapsedEventHandler(OnUpdateTimer); //initialize the layer's tables (main table as well as the symbols table) InitializeTables(); //get the location list from a featureclass (US major cities) and synchronize it with the //cached information in case it exists. if (null == m_locations) InitializeLocations(); //initialize the selection symbol used to highlight selected weather items InitializeSelectionSymbol(); m_point = new PointClass(); m_llPnt = new PointClass(); m_urPnt = new PointClass(); m_env = new EnvelopeClass(); //connect to the RSS service Connect(); } catch (Exception ex) { System.Diagnostics.Trace.WriteLine(ex.Message); } } ~RSSWeatherLayerClass() { Disconnect(); } #endregion #region Overriden methods /// <summary> /// Draws the layer to the specified display for the given draw phase. /// </summary> /// <param name="drawPhase"></param> /// <param name="Display"></param> /// <param name="trackCancel"></param> /// <remarks>the draw method is set as an abstract method and therefore must be overridden</remarks> public override void Draw(esriDrawPhase drawPhase, IDisplay Display, ITrackCancel trackCancel) { if(drawPhase != esriDrawPhase.esriDPGeography) return; if(Display == null) return; if(m_table == null || m_symbolTable == null) return; m_display = Display; IEnvelope envelope = Display.DisplayTransformation.FittedBounds as IEnvelope; double lat, lon; int iconCode; bool selected; ISymbol symbol = null; //loop through the rows. Draw each row that has a shape foreach (DataRow row in m_table.Rows) { //get the Lat/Lon of the item lat = Convert.ToDouble(row[3]); lon = Convert.ToDouble(row[4]); //get the icon ID iconCode = Convert.ToInt32(row[8]); //get the selection state of the item selected = Convert.ToBoolean(row[13]); if(lon >= envelope.XMin && lon <= envelope.XMax && lat >= envelope.YMin && lat <= envelope.YMax) { //search for the symbol in the symbology table symbol = GetSymbol(iconCode, row); if(null == symbol) continue; m_point.X = lon; m_point.Y = lat; m_point.SpatialReference = m_spatialRef; //reproject the point to the DataFrame's spatial reference if (null != m_mapSpatialRef && m_mapSpatialRef.FactoryCode != m_layerSRFactoryCode) m_point.Project(m_mapSpatialRef); Display.SetSymbol(symbol); Display.DrawPoint(m_point); if(selected) { Display.SetSymbol(m_selectionSymbol); Display.DrawPoint(m_point); } } } } /// <summary> /// Draw the layer while in dynamic mode /// </summary> /// <param name="DynamicDrawPhase"></param> /// <param name="Display"></param> /// <param name="DynamicDisplay"></param> public override void DrawDynamicLayer(esriDynamicDrawPhase DynamicDrawPhase, IDisplay Display, IDynamicDisplay DynamicDisplay) { if (DynamicDrawPhase != esriDynamicDrawPhase.esriDDPCompiled) return; if (!m_bValid || !m_visible) return; if (m_bDDOnce) { m_dynamicGlyphFactory = DynamicDisplay.DynamicGlyphFactory as IDynamicGlyphFactory2; m_dynamicSymbolProperties = DynamicDisplay as IDynamicSymbolProperties2; m_dynamicCompoundMarker = DynamicDisplay as IDynamicCompoundMarker2; m_textGlyph = m_dynamicGlyphFactory.get_DynamicGlyph(1, esriDynamicGlyphType.esriDGlyphText, 1); // create glyph for the selection symbol if (m_selectionSymbol == null) InitializeSelectionSymbol(); m_selectionGlyph = m_dynamicGlyphFactory.CreateDynamicGlyph(m_selectionSymbol); m_bDDOnce = false; } m_display = Display; double lat, lon; int iconCode; int iconWidth = 0; bool selected; IDynamicGlyph dynamicGlyph = null; float symbolSized; string citiName = string.Empty; string temperature = string.Empty; //loop through the rows. Draw each row that has a shape foreach (DataRow row in m_table.Rows) { //get the Lat/Lon of the item lat = Convert.ToDouble(row[3]); lon = Convert.ToDouble(row[4]); //get the icon ID iconCode = Convert.ToInt32(row[8]); // get citiname and temperature citiName = Convert.ToString(row[2]); temperature = string.Format("{0} F", row[5]); //get the selection state of the item selected = Convert.ToBoolean(row[13]); //search for the symbol in the symbology table dynamicGlyph = GetDynamicGlyph(m_dynamicGlyphFactory, iconCode, row, out iconWidth); if (null == dynamicGlyph) continue; m_point.X = lon; m_point.Y = lat; m_point.SpatialReference = m_spatialRef; //reproject the point to the DataFrame's spatial reference if (null != m_spatialRef && m_mapSpatialRef.FactoryCode != m_layerSRFactoryCode) m_point.Project(m_mapSpatialRef); symbolSized = 1.35f * (float)(m_symbolSize / (double)iconWidth); // draw the weather item // 1. set the whether symbol properties m_dynamicSymbolProperties.set_DynamicGlyph(esriDynamicSymbolType.esriDSymbolMarker, dynamicGlyph); m_dynamicSymbolProperties.set_RotationAlignment(esriDynamicSymbolType.esriDSymbolMarker, esriDynamicSymbolRotationAlignment.esriDSRAScreen); m_dynamicSymbolProperties.set_Heading(esriDynamicSymbolType.esriDSymbolMarker, 0.0f); m_dynamicSymbolProperties.SetColor(esriDynamicSymbolType.esriDSymbolMarker, 1.0f, 1.0f, 1.0f, 1.0f); m_dynamicSymbolProperties.SetScale(esriDynamicSymbolType.esriDSymbolMarker, symbolSized, symbolSized); m_dynamicSymbolProperties.set_Smooth(esriDynamicSymbolType.esriDSymbolMarker, false); // 2. set the text properties m_dynamicSymbolProperties.set_DynamicGlyph(esriDynamicSymbolType.esriDSymbolText, m_textGlyph); m_dynamicSymbolProperties.set_RotationAlignment(esriDynamicSymbolType.esriDSymbolMarker, esriDynamicSymbolRotationAlignment.esriDSRAScreen); m_dynamicSymbolProperties.set_Heading(esriDynamicSymbolType.esriDSymbolText, 0.0f); m_dynamicSymbolProperties.SetColor(esriDynamicSymbolType.esriDSymbolText, 0.0f, 0.85f, 0.0f, 1.0f); m_dynamicSymbolProperties.SetScale(esriDynamicSymbolType.esriDSymbolText, 1.0f, 1.0f); m_dynamicSymbolProperties.set_Smooth(esriDynamicSymbolType.esriDSymbolText, false); m_dynamicSymbolProperties.TextBoxUseDynamicFillSymbol = false; m_dynamicSymbolProperties.TextBoxHorizontalAlignment = esriTextHorizontalAlignment.esriTHACenter; m_dynamicSymbolProperties.TextRightToLeft = false; // draw both the icon and the text as a compound marker m_dynamicCompoundMarker.DrawCompoundMarker2(m_point, temperature, citiName); if (selected) // draw the selected symbol { m_dynamicSymbolProperties.SetColor(esriDynamicSymbolType.esriDSymbolMarker, 0.0f, 1.0f, 1.0f, 1.0f); m_dynamicSymbolProperties.set_DynamicGlyph(esriDynamicSymbolType.esriDSymbolMarker, m_selectionGlyph); DynamicDisplay.DrawMarker(m_point); } } base.m_bIsCompiledDirty = false; } /// <summary> /// The spatial reference of the underlying data. /// </summary> public override ISpatialReference SpatialReference { get { if(null == m_spatialRef) { m_spatialRef = CreateGeographicSpatialReference(); } return m_spatialRef; } } /// <summary> /// The ID of the object. /// </summary> public override ESRI.ArcGIS.esriSystem.UID ID { get { UID uid = new UIDClass(); uid.Value = "RSSWeatherLayer.RSSWeatherLayerClass"; return uid; } } /// <summary> /// The default area of interest for the layer. Returns the spatial-referenced extent of the layer. /// </summary> public override IEnvelope AreaOfInterest { get { return this.Extent; } } /// <summary> /// The layer's extent which is a union of the extents of all the items of the layer /// </summary> /// <remarks>In case where the DataFram's spatial reference is different than the underlying /// data's spatial reference the envelope must be projected</remarks> public override IEnvelope Extent { get { m_extent = GetLayerExtent(); if(null == m_extent) return null; IEnvelope env = ((IClone)m_extent).Clone() as IEnvelope; if (null != m_mapSpatialRef && m_mapSpatialRef.FactoryCode != m_layerSRFactoryCode) env.Project(m_mapSpatialRef); return env; } } /// <summary> /// Map tip text at the specified mouse location. /// </summary> /// <param name="X"></param> /// <param name="Y"></param> /// <param name="Tolerance"></param> /// <returns></returns> public override string get_TipText(double X, double Y, double Tolerance) { IEnvelope envelope = new EnvelopeClass(); envelope.PutCoords(X - Tolerance, Y - Tolerance,X + Tolerance, Y + Tolerance); //reproject the envelope to the datasource doordinate system if (null != m_mapSpatialRef && m_mapSpatialRef.FactoryCode != m_layerSRFactoryCode) { envelope.SpatialReference = m_spatialRef; envelope.Project(m_mapSpatialRef); } double xmin, ymin, xmax, ymax; envelope.QueryCoords(out xmin, out ymin, out xmax, out ymax); //select all the records within the given extent string qry = "LON >= " + xmin.ToString() + " AND LON <= " + xmax.ToString() + " AND Lat >= " + ymin.ToString() + " AND LAT <= " + ymax.ToString(); DataRow[] rows = m_table.Select(qry); if(0 == rows.Length) return string.Empty; DataRow r = rows[0]; string zipCode = Convert.ToString(r[1]); string cityName = Convert.ToString(r[2]); string temperature = Convert.ToString(r[5]); return cityName + ", " + zipCode + ", " + temperature + "F"; } #endregion #region public methods /// <summary> /// connects to RSS weather service /// </summary> public void Connect() { //enable the update timer m_timer.Enabled = true; base.m_bIsCompiledDirty = true; } /// <summary> /// disconnects from RSS weather service /// </summary> public void Disconnect() { //disable the update timer m_timer.Enabled = false; try { //abort the update thread in case that it is alive if(m_updateThread.IsAlive) m_updateThread.Abort(); } catch { System.Diagnostics.Trace.WriteLine("WeatherLayer update thread has been terminated"); } } /// <summary> /// select a weather item by its zipCode /// </summary> /// <param name="zipCode"></param> /// <param name="newSelection"></param> public void Select(long zipCode, bool newSelection) { if(null == m_table) return; if(newSelection) { UnselectAll(); } DataRow[] rows = m_table.Select("ZIPCODE = " + zipCode.ToString()); if(rows.Length == 0) return; DataRow rec = rows[0]; lock(m_table) { //13 is the selection column ID rec[13] = true; rec.AcceptChanges(); } base.m_bIsCompiledDirty = true; } /// <summary> /// unselect all weather items /// </summary> public void UnselectAll() { if(null == m_table) return; //unselect all the currently selected items lock(m_table) { foreach(DataRow r in m_table.Rows) { //13 is the selection column ID r[13] = false; } m_table.AcceptChanges(); } base.m_bIsCompiledDirty = true; } /// <summary> /// Run the update thread /// </summary> /// <remarks>calling this method to frequently might end up in blockage of RSS service. /// The service will interpret the excessive calls as an offence and thus would block the service for a while.</remarks> public void Refresh() { try { m_updateThread = new Thread(new ThreadStart(ThreadProc)); //run the update thread m_updateThread.Start(); } catch(Exception ex) { System.Diagnostics.Trace.WriteLine(ex.Message); } } /// <summary> /// add a new item given only a zipcode (will use the default location given by the service) /// should the item exists, it will get updated /// </summary> /// <param name="zipCode"></param> /// <returns></returns> public bool AddItem(long zipCode) { return AddItem(zipCode, 0.0 ,0.0); } /// <summary> /// adds a new item given a zipcode and a coordinate. /// Should the item already exists, it will get updated and will move to the new coordinate. /// </summary> /// <param name="zipCode"></param> /// <param name="lat"></param> /// <param name="lon"></param> /// <returns></returns> public bool AddItem(long zipCode, double lat, double lon) { if(null == m_table) return false; DataRow r = m_table.Rows.Find(zipCode); if(null != r) //if the record with this zipCode already exists { //in case that the record exists and the input coordinates are not valid if(lat == 0.0 && lon == 0.0) return false; else //update the location according to the new coordinate { lock(m_table) { r[3] = lat; r[4] = lon; r.AcceptChanges(); } } } else { //add new zip code to the locations list DataRow rec = m_locations.NewRow(); lock(m_locations) { rec[1] = zipCode; m_locations.Rows.Add(rec); } //need to connect to the service and get the info AddWeatherItem(zipCode, lat, lon); } return true; } /// <summary> /// delete an item from the dataset /// </summary> /// <param name="zipCode"></param> /// <returns></returns> public bool DeleteItem(long zipCode) { if(null == m_table) return false; try { DataRow r = m_table.Rows.Find(zipCode); if(null != r) //if the record with this zipCode already exists { lock(m_table) { r.Delete(); } base.m_bIsCompiledDirty = true; return true; } base.m_bIsCompiledDirty = true; return false; } catch(Exception ex) { System.Diagnostics.Trace.WriteLine(ex.Message); return false; } } /// <summary> /// get a weather item given a city name. /// </summary> /// <param name="cityName"></param> /// <returns></returns> /// <remarks>a city might have more than one zipCode and therefore this method will /// return the first zipcOde found for the specified city name.</remarks> public IPropertySet GetWeatherItem(string cityName) { if(null == m_table) return null; DataRow[] rows = m_table.Select("CITYNAME = '" + cityName + "'"); if(rows.Length == 0) return null; long zipCode = Convert.ToInt64(rows[0][1]); return GetWeatherItem(zipCode); } /// <summary> /// This method searches for the record of the given zipcode and retunes the information as a PropertySet. /// </summary> /// <param name="zipCode"></param> /// <returns>a PropertySet encapsulating the weather information for the given weather item.</returns> public IPropertySet GetWeatherItem(long zipCode) { DataRow r = m_table.Rows.Find(zipCode); if(null == r) return null; IPropertySet propSet = new PropertySetClass(); propSet.SetProperty( "ID", r[0]); propSet.SetProperty( "ZIPCODE", r[1]); propSet.SetProperty( "CITYNAME", r[2]); propSet.SetProperty( "LAT", r[3]); propSet.SetProperty( "LON", r[4]); propSet.SetProperty( "TEMPERATURE", r[5]); propSet.SetProperty( "CONDITION", r[6]); propSet.SetProperty( "ICONNAME", r[7]); propSet.SetProperty( "ICONID", r[8]); propSet.SetProperty( "DAY", r[9]); propSet.SetProperty( "DATE", r[10]); propSet.SetProperty( "LOW", r[11]); propSet.SetProperty( "HIGH", r[12]); propSet.SetProperty( "UPDATEDATE", r[14]); return propSet; } /// <summary> /// get a list of all citynames currently in the dataset. /// </summary> /// <returns></returns> /// <remarks>Please note that since the unique ID is zipCode, it is possible /// to have a city name appearing more than once.</remarks> public string[] GetCityNames() { if(null == m_table || 0 == m_table.Rows.Count) return null; string[] cityNames = new string[m_table.Rows.Count]; for(int i=0; i<m_table.Rows.Count; i++) { //column #2 stores the cityName cityNames[i] = Convert.ToString(m_table.Rows[i][2]); } return cityNames; } /// <summary> /// Zoom to a weather item according to its city name /// </summary> /// <param name="cityName"></param> public void ZoomTo(string cityName) { if(null == m_table) return; DataRow[] rows = m_table.Select("CITYNAME = '" + cityName + "'"); if(rows.Length == 0) return; long zipCode = Convert.ToInt64(rows[0][1]); ZoomTo(zipCode); } /// <summary> /// Zoom to weather item according to its zipcode /// </summary> /// <param name="zipCode"></param> public void ZoomTo(long zipCode) { if(null == m_table || null == m_symbolTable ) return; if(null == m_display) return; //get the record for the requested zipCode DataRow r = m_table.Rows.Find(zipCode); if(null == r) return; //get the coordinate of the zipCode double lat = Convert.ToDouble(r[3]); double lon = Convert.ToDouble(r[4]); IPoint point = new PointClass(); point.X = lon; point.Y = lat; point.SpatialReference = m_spatialRef; if (null != m_mapSpatialRef && m_mapSpatialRef.FactoryCode != m_layerSRFactoryCode) point.Project(m_mapSpatialRef); int iconCode = Convert.ToInt32(r[8]); //find the appropriate symbol record DataRow rec = m_symbolTable.Rows.Find(iconCode); if(rec == null) return; //get the icon's dimensions int iconWidth = Convert.ToInt32(rec[3]); int iconHeight = Convert.ToInt32(rec[4]); IDisplayTransformation displayTransformation = ((IScreenDisplay)m_display).DisplayTransformation; //Convert the icon coordinate into screen coordinate int windowX, windowY; displayTransformation.FromMapPoint(point,out windowX, out windowY); //get the upper left coord int ulx, uly; ulx = windowX - iconWidth/2; uly = windowY - iconHeight/2; IPoint ulPnt = displayTransformation.ToMapPoint(ulx, uly); //get the lower right coord int lrx,lry; lrx = windowX + iconWidth/2; lry = windowY + iconHeight/2; IPoint lrPnt = displayTransformation.ToMapPoint(lrx, lry); //construct the new extent IEnvelope envelope = new EnvelopeClass(); envelope.PutCoords(ulPnt.X, lrPnt.Y, lrPnt.X, ulPnt.Y); envelope.Expand(2,2,false); //set the new extent and refresh the display displayTransformation.VisibleBounds = envelope; base.m_bIsCompiledDirty = true; ((IScreenDisplay)m_display).Invalidate(null, true, (short)esriScreenCache.esriAllScreenCaches); ((IScreenDisplay)m_display).UpdateWindow(); } private void SetSymbolSize(int newSize) { if (newSize <= 0) { MessageBox.Show("Size is not allowed."); return; } m_symbolSize = newSize; if (null == m_symbolTable || 0 == m_symbolTable.Rows.Count) return; IPictureMarkerSymbol pictureMarkerSymbol = null; lock (m_symbolTable) { foreach (DataRow r in m_symbolTable.Rows) { pictureMarkerSymbol = r[2] as IPictureMarkerSymbol; if (null == pictureMarkerSymbol) continue; pictureMarkerSymbol.Size = newSize; r[2] = pictureMarkerSymbol; r.AcceptChanges(); } } base.m_bIsCompiledDirty = true; ((IScreenDisplay)m_display).Invalidate(null, true, (short)esriScreenCache.esriAllScreenCaches); ((IScreenDisplay)m_display).UpdateWindow(); } public int SymbolSize { set { SetSymbolSize(value); } get { return m_symbolSize; } } #endregion #region private utility methods /// <summary> /// create a WGS1984 geographic coordinate system. /// In this case, the underlying data provided by the service is in WGS1984. /// </summary> /// <returns></returns> private ISpatialReference CreateGeographicSpatialReference() { ISpatialReferenceFactory spatialRefFatcory = new SpatialReferenceEnvironmentClass(); IGeographicCoordinateSystem geoCoordSys; geoCoordSys = spatialRefFatcory.CreateGeographicCoordinateSystem((int)esriSRGeoCSType.esriSRGeoCS_WGS1984); geoCoordSys.SetFalseOriginAndUnits(-180.0, -180.0, 5000000.0); geoCoordSys.SetZFalseOriginAndUnits(0.0, 100000.0); geoCoordSys.SetMFalseOriginAndUnits(0.0, 100000.0); return geoCoordSys as ISpatialReference; } /// <summary> /// get the overall extent of the items in the layer /// </summary> /// <returns></returns> private IEnvelope GetLayerExtent() { //iterate through all the items in the layers DB and get the bounding envelope IEnvelope env = new EnvelopeClass(); env.SpatialReference = m_spatialRef; IPoint point = new PointClass(); point.SpatialReference = m_spatialRef; int symbolCode = 0; double symbolSize = 0; foreach(DataRow r in m_table.Rows) { if (r[3] is DBNull || r[4] is DBNull) continue; point.Y = Convert.ToDouble(r[3]); point.X = Convert.ToDouble(r[4]); // need to get the symbol size in meters in order to add it to the total layer extent if (m_display != null) { symbolCode = Convert.ToInt32(r[8]); symbolSize = Math.Max(GetSymbolSize(m_display, symbolCode), symbolSize); } env.Union(point.Envelope); } // Expand the envelope in order to include the size of the symbol env.Expand(symbolSize, symbolSize, false); //return the layer's extent in the data underlying coordinate system return env; } /// <summary> /// initialize the main table used by the layer as well as the symbols table. /// The base class calles new on the table and adds a default ID field. /// </summary> private void InitializeTables() { string path = System.IO.Path.Combine(m_dataFolder, "Weather.xml"); //In case that there is no existing cache on the local machine, create the table. if(!System.IO.File.Exists(path)) { //create the table the table in addition to the default 'ID' and 'Geometry' m_table = new DataTable("RECORDS"); m_table.Columns.Add( "ID", typeof(long)); //0 m_table.Columns.Add( "ZIPCODE", typeof(long)); //1 m_table.Columns.Add( "CITYNAME", typeof(string)); //2 m_table.Columns.Add( "LAT", typeof(double)); //3 m_table.Columns.Add( "LON", typeof(double)); //4 m_table.Columns.Add( "TEMP", typeof(int)); //5 m_table.Columns.Add( "CONDITION", typeof(string)); //6 m_table.Columns.Add( "ICONNAME", typeof(string)); //7 m_table.Columns.Add( "ICONID", typeof(int)); //8 m_table.Columns.Add( "DAY", typeof(string)); //9 m_table.Columns.Add( "DATE", typeof(string)); //10 m_table.Columns.Add( "LOW", typeof(string)); //11 m_table.Columns.Add( "HIGH", typeof(string)); //12 m_table.Columns.Add( "SELECTED", typeof(bool)); //13 m_table.Columns.Add( "UPDATEDATE", typeof(DateTime)); //14 //set the ID column to be auto increment m_table.Columns[0].AutoIncrement = true; m_table.Columns[0].ReadOnly = true; //the zipCode column must be the unique and nut allow null m_table.Columns[1].Unique = true; // set the ZIPCODE primary key for the table m_table.PrimaryKey = new DataColumn[] {m_table.Columns["ZIPCODE"]}; } else //in case that the local cache exists, simply load the tables from the cache. { DataSet ds = new DataSet(); ds.ReadXml(path); m_table = ds.Tables["RECORDS"]; if (null == m_table) throw new Exception("Cannot find 'RECORDS' table"); if (15 != m_table.Columns.Count) throw new Exception("Table 'RECORDS' does not have all required columns"); m_table.Columns[0].ReadOnly = true; // set the ZIPCODE primary key for the table m_table.PrimaryKey = new DataColumn[] {m_table.Columns["ZIPCODE"]}; //synchronize the locations table foreach(DataRow r in m_table.Rows) { try { //in case that the locations table does not exists, create and initialize it if(null == m_locations) InitializeLocations(); //get the zipcode for the record string zip = Convert.ToString(r[1]); //make sure that there is no existing record with that zipCode already in the //locations table. DataRow[] rows = m_locations.Select("ZIPCODE = " + zip); if(0 == rows.Length) { DataRow rec = m_locations.NewRow(); rec[1] = Convert.ToInt64(r[1]); //zip code rec[2] = Convert.ToString(r[2]); //city name //add the new record to the locations table lock(m_locations) { m_locations.Rows.Add(rec); } } } catch(Exception ex) { System.Diagnostics.Trace.WriteLine(ex.Message); } } //displose the DS ds.Tables.Remove(m_table); ds.Dispose(); GC.Collect(); } //initialize the symbol map table m_symbolTable = new DataTable("Symbology"); //add the columns to the table m_symbolTable.Columns.Add( "ID", typeof(int)); //0 m_symbolTable.Columns.Add( "ICONID", typeof(int)); //1 m_symbolTable.Columns.Add( "SYMBOL", typeof(ISymbol)); //2 m_symbolTable.Columns.Add( "SYMBOLWIDTH", typeof(int)); //3 m_symbolTable.Columns.Add( "SYMBOLHEIGHT", typeof(int)); //4 m_symbolTable.Columns.Add( "DYNAMICGLYPH", typeof(IDynamicGlyph)); //5 m_symbolTable.Columns.Add( "BITMAP", typeof(Bitmap)); //6 //set the ID column to be auto increment m_symbolTable.Columns[0].AutoIncrement = true; m_symbolTable.Columns[0].ReadOnly = true; m_symbolTable.Columns[1].AllowDBNull = false; m_symbolTable.Columns[1].Unique = true; //set ICONID as the primary key for the table m_symbolTable.PrimaryKey = new DataColumn[] {m_symbolTable.Columns["ICONID"]}; } /// <summary> /// Initialize the location table. Gets the location from a featureclass /// </summary> private void InitializeLocations() { //create a new instance of the location table m_locations = new DataTable(); //add fields to the table m_locations.Columns.Add( "ID", typeof(int)); m_locations.Columns.Add( "ZIPCODE", typeof(long)); m_locations.Columns.Add( "CITYNAME", typeof(string)); m_locations.Columns[0].AutoIncrement = true; m_locations.Columns[0].ReadOnly = true; //set ZIPCODE as the primary key for the table m_locations.PrimaryKey = new DataColumn[] {m_locations.Columns["ZIPCODE"]}; //spawn a thread to populate the locations table Thread t = new Thread(new ThreadStart(PopulateLocationsTableProc)); t.Start(); System.Threading.Thread.Sleep(1000); } /// <summary> /// Load the information from the MajorCities featureclass to the locations table /// </summary> private void PopulateLocationsTableProc() { //get the ArcGIS path from the registry RegistryKey key = Registry.LocalMachine.OpenSubKey(@"SOFTWARE\ESRI\ArcGIS_SXS_SDK"); string path = Convert.ToString(key.GetValue("InstallDir")); if (!System.IO.File.Exists(System.IO.Path.Combine(path, @"Samples\Data\USZipCodeData\ZipCode_Boundaries_US_Major_Cities.shp"))) { MessageBox.Show("Cannot find file ZipCode_Boundaries_US_Major_Cities.shp!"); return; } //open the featureclass IWorkspaceFactory wf = new ShapefileWorkspaceFactoryClass() as IWorkspaceFactory; IWorkspace ws = wf.OpenFromFile(System.IO.Path.Combine(path, @"Samples\Data\USZipCodeData"), 0); IFeatureWorkspace fw = ws as IFeatureWorkspace; IFeatureClass featureClass = fw.OpenFeatureClass("ZipCode_Boundaries_US_Major_Cities"); //map the name and zip fields int zipIndex = featureClass.FindField("ZIP"); int nameIndex = featureClass.FindField("NAME"); string cityName; long zip; try { //iterate through the features and add the information to the table IFeatureCursor fCursor = null; fCursor = featureClass.Search(null, true); IFeature feature = fCursor.NextFeature(); int index = 0; while(null != feature) { object obj = feature.get_Value(nameIndex); if (obj == null) continue; cityName = Convert.ToString(obj); obj = feature.get_Value(zipIndex); if (obj == null) continue; zip = long.Parse(Convert.ToString(obj)); if(zip <= 0) continue; //add the current location to the location table DataRow r = m_locations.Rows.Find(zip); if(null == r) { r = m_locations.NewRow(); r[1] = zip; r[2] = cityName; lock(m_locations) { m_locations.Rows.Add(r); } } feature = fCursor.NextFeature(); index++; } //release the feature cursor Marshal.ReleaseComObject(fCursor); } catch(Exception ex) { System.Diagnostics.Trace.WriteLine(ex.Message); } } /// <summary> /// Initialize the symbol that would use to highlight selected items /// </summary> private void InitializeSelectionSymbol() { //use a character marker symbol: ICharacterMarkerSymbol chMrkSym; chMrkSym = new CharacterMarkerSymbolClass(); //Set the selection color (yellow) IRgbColor color; color = new RgbColorClass(); color.Red = 0; color.Green = 255; color.Blue = 255; //set the font stdole.IFont aFont; aFont = new stdole.StdFontClass(); aFont.Name = "ESRI Default Marker"; aFont.Size = m_symbolSize; aFont.Bold = true; //char #41 is just a rectangle chMrkSym.CharacterIndex = 41; chMrkSym.Color = color as IColor; chMrkSym.Font = aFont as stdole.IFontDisp; chMrkSym.Size = m_symbolSize; m_selectionSymbol = chMrkSym as ISymbol; } /// <summary> /// run the thread that does the update of the weather data /// </summary> /// <param name="sender"></param> /// <param name="e"></param> private void OnUpdateTimer(object sender, ElapsedEventArgs e) { m_timer.Interval = 2700000; //(45 minutes) m_updateThread = new Thread(new ThreadStart(ThreadProc)); //run the update thread m_updateThread.Start(); } /// <summary> /// the main update thread for the layer. /// </summary> /// <remarks>Since the layer gets the weather information from a web service which might /// take a while to respond, it is not logical to let the application hang while waiting /// for response. Therefore, running the request on a different thread frees the application to /// continue working while waiting for a response. /// Please note that in this case, synchronization of shared resources must be addressed, /// otherwise you might end up getting unexpected results.</remarks> private void ThreadProc() { try { long lZipCode; //iterate through all the records in the main table and update it against //the information from the website. foreach(DataRow r in m_locations.Rows) { //put the thread to sleep in order not to overwhelm yahoo web site might System.Threading.Thread.Sleep(200); //get the zip code of the record (column #1) lZipCode = Convert.ToInt32(r[1]); //make the request and update the item AddWeatherItem(lZipCode, 0.0, 0.0); } //serialize the tables onto the local machine DataSet ds = new DataSet(); ds.Tables.Add(m_table); ds.WriteXml(System.IO.Path.Combine(m_dataFolder, "Weather.xml")); ds.Tables.Remove(m_table); ds.Dispose(); GC.Collect(); base.m_bIsCompiledDirty = true; //fire an event to notify update of the weatheritems if(OnWeatherItemsUpdated != null) OnWeatherItemsUpdated(this, new EventArgs()); } catch(Exception ex) { System.Diagnostics.Trace.WriteLine(ex.Message); } } /// <summary> /// given a bitmap url, saves it on the local machine and returns its size /// </summary> /// <param name="iconPath"></param> /// <param name="width"></param> /// <param name="height"></param> private Bitmap DownloadIcon(string iconPath, out int width, out int height) { //if the icon does not exist on the local machine, get it from RSS site string iconFileName = System.IO.Path.Combine(m_iconFolder, System.IO.Path.GetFileNameWithoutExtension(iconPath) + ".bmp"); width = 0; height = 0; Bitmap bitmap = null; if(!File.Exists(iconFileName)) { using (System.Net.WebClient webClient = new System.Net.WebClient()) { //open a readable stream to download the bitmap using (System.IO.Stream stream = webClient.OpenRead(iconPath)) { bitmap = new Bitmap(stream, true); //save the image as a bitmap in the icons folder bitmap.Save(iconFileName, ImageFormat.Bmp); //get the bitmap's dimensions width = bitmap.Width; height = bitmap.Height; } } } else { //get the bitmap's dimensions { bitmap = new Bitmap(iconFileName); width = bitmap.Width; height = bitmap.Height; } } return bitmap; } /// <summary> /// get the specified symbol from the symbols table. /// </summary> /// <param name="iconCode"></param> /// <param name="dbr"></param> /// <returns></returns> private ISymbol GetSymbol(int iconCode, DataRow dbr) { ISymbol symbol = null; string iconPath; int iconWidth, iconHeight; Bitmap bitmap = null; //search for an existing symbol in the table DataRow r = m_symbolTable.Rows.Find(iconCode); if(r == null) //in case that the symbol does not exist in the table, create a new entry { r = m_symbolTable.NewRow(); r[1] = iconCode; iconPath = Convert.ToString(dbr[7]); //Initialize the picture marker symbol symbol = InitializeSymbol(iconPath, out iconWidth, out iconHeight, out bitmap); if(null == symbol) return null; //update the symbol table lock (m_symbolTable) { r[2] = symbol; r[3] = iconWidth; r[4] = iconHeight; r[6] = bitmap; m_symbolTable.Rows.Add(r); } } else { if (r[2] is DBNull) //in case that the record exists but the symbol hasn't been initialized { iconPath = Convert.ToString(dbr[7]); //Initialize the picture marker symbol symbol = InitializeSymbol(iconPath, out iconWidth, out iconHeight, out bitmap); if(null == symbol) return null; //update the symbol table lock(m_symbolTable) { r[2] = symbol; r[6] = bitmap; r.AcceptChanges(); } } else //the record exists in the table and the symbol has been initialized //get the symbol symbol = r[2] as ISymbol; } //return the requested symbol return symbol; } private IDynamicGlyph GetDynamicGlyph(IDynamicGlyphFactory2 dynamicGlyphFactory, int iconCode, DataRow dbr, out int originalIconSize) { originalIconSize = 0; if (dynamicGlyphFactory == null) return null; string iconPath; int iconWidth, iconHeight; Bitmap bitmap = null; IDynamicGlyph dynamicGlyph = null; //search for an existing symbol in the table DataRow r = m_symbolTable.Rows.Find(iconCode); if (r == null) { iconPath = Convert.ToString(dbr[7]); bitmap = DownloadIcon(iconPath, out iconWidth, out iconHeight); if (bitmap != null) { originalIconSize = iconWidth; dynamicGlyph = dynamicGlyphFactory.CreateDynamicGlyphFromBitmap(esriDynamicGlyphType.esriDGlyphMarker, bitmap.GetHbitmap().ToInt32(), false, (IColor)ESRI.ArcGIS.ADF.Connection.Local.Converter.ToRGBColor(Color.FromArgb(255, 255, 255)) ); //update the symbol table r = m_symbolTable.NewRow(); lock (m_symbolTable) { r[1] = iconCode; r[3] = iconWidth; r[4] = iconHeight; r[5] = dynamicGlyph; r[6] = bitmap; m_symbolTable.Rows.Add(r); } } } else { if (r[5] is DBNull) { if (r[6] is DBNull) { iconPath = Convert.ToString(dbr[7]); bitmap = DownloadIcon(iconPath, out iconWidth, out iconHeight); if (bitmap == null) return null; originalIconSize = iconWidth; lock (m_symbolTable) { r[3] = iconWidth; r[4] = iconHeight; r[6] = bitmap; } } else { originalIconSize = Convert.ToInt32(r[3]); bitmap = (Bitmap)r[6]; } dynamicGlyph = dynamicGlyphFactory.CreateDynamicGlyphFromBitmap(esriDynamicGlyphType.esriDGlyphMarker, bitmap.GetHbitmap().ToInt32(), false, (IColor)ESRI.ArcGIS.ADF.Connection.Local.Converter.ToRGBColor(Color.FromArgb(255, 255, 255)) ); lock (m_symbolTable) { r[5] = dynamicGlyph; } } else { originalIconSize = Convert.ToInt32(r[3]); dynamicGlyph = (IDynamicGlyph)r[5]; } } return dynamicGlyph; } /// <summary> /// Initialize a character marker symbol for a given bitmap path /// </summary> /// <param name="iconPath"></param> /// <param name="iconWidth"></param> /// <param name="iconHeight"></param> /// <returns></returns> private ISymbol InitializeSymbol(string iconPath, out int iconWidth, out int iconHeight, out Bitmap bitmap) { iconWidth = iconHeight = 0; bitmap = null; try { //make sure that the icon exit on dist or else download it bitmap = DownloadIcon(iconPath, out iconWidth, out iconHeight); string iconFileName = System.IO.Path.Combine(m_iconFolder, System.IO.Path.GetFileNameWithoutExtension(iconPath) + ".bmp"); if(!System.IO.File.Exists(iconFileName)) return null; //initialize the transparent color IRgbColor rgbColor = new RgbColorClass(); rgbColor.Red = 255; rgbColor.Blue = 255; rgbColor.Green = 255; //instantiate the marker symbol and set its properties IPictureMarkerSymbol pictureMarkerSymbol = new PictureMarkerSymbolClass(); pictureMarkerSymbol.CreateMarkerSymbolFromFile(ESRI.ArcGIS.Display.esriIPictureType.esriIPictureBitmap, iconFileName); pictureMarkerSymbol.Angle = 0; pictureMarkerSymbol.Size = m_symbolSize; pictureMarkerSymbol.XOffset = 0; pictureMarkerSymbol.YOffset = 0; pictureMarkerSymbol.BitmapTransparencyColor = rgbColor as IColor; //return the symbol return (ISymbol)pictureMarkerSymbol; } catch { return null; } } /// <summary> /// Makes a request against RSS Weather service and add update the layer's table /// </summary> /// <param name="zipCode"></param> /// <param name="Lat"></param> /// <param name="Lon"></param> private void AddWeatherItem(long zipCode, double Lat, double Lon) { try { string cityName; double lat, lon; int temp; string condition; string desc; string iconPath; string day; string date; int low; int high; int iconCode; int iconWidth = 52; //default values int iconHeight = 52; Bitmap bitmap = null; DataRow dbr = m_table.Rows.Find(zipCode); if (dbr != null) { // get the date DateTime updateDate = Convert.ToDateTime(dbr[14]); TimeSpan ts = DateTime.Now - updateDate; // if the item had been updated in the past 15 minutes, simply bail out. if (ts.TotalMinutes < 15) return; } //the base URL for the service string url = "http://xml.weather.yahoo.com/forecastrss?p="; //the RegEx used to extract the icon path from the HTML tag string regxQry = "(http://(\\\")?(.*?\\.gif))"; XmlTextReader reader = null; XmlDocument doc; XmlNode node; try { //make the request and get the result back into XmlReader reader = new XmlTextReader(url + zipCode.ToString()); } catch(Exception ex) { System.Diagnostics.Trace.WriteLine(ex.Message); return; } //load the XmlReader to an xml doc doc = new XmlDocument(); doc.Load(reader); //set an XmlNamespaceManager since we have to make explicit namespace searches XmlNamespaceManager xmlnsManager = new System.Xml.XmlNamespaceManager(doc.NameTable); //Add the namespaces used in the xml doc to the XmlNamespaceManager. xmlnsManager.AddNamespace("yweather", "http://xml.weather.yahoo.com/ns/rss/1.0"); xmlnsManager.AddNamespace("geo", "http://www.w3.org/2003/01/geo/wgs84_pos#"); //make sure that the node exists node = doc.DocumentElement.SelectSingleNode("/rss/channel/yweather:location/@city", xmlnsManager); if(null == node) return; //get the cityname cityName = doc.DocumentElement.SelectSingleNode("/rss/channel/yweather:location/@city", xmlnsManager).InnerXml; if(Lat == 0.0 && Lon == 0.0) { //in case that the caller did not specify a coordinate, get the default coordinate from the service lat = Convert.ToDouble(doc.DocumentElement.SelectSingleNode("/rss/channel/item/geo:lat", xmlnsManager).InnerXml); lon = Convert.ToDouble(doc.DocumentElement.SelectSingleNode("/rss/channel/item/geo:long", xmlnsManager).InnerXml); } else { lat = Lat; lon = Lon; } //extract the rest of the information from the RSS response condition = doc.DocumentElement.SelectSingleNode("/rss/channel/item/yweather:condition/@text", xmlnsManager).InnerXml; iconCode = Convert.ToInt32(doc.DocumentElement.SelectSingleNode("/rss/channel/item/yweather:condition/@code", xmlnsManager).InnerXml); temp = Convert.ToInt32(doc.DocumentElement.SelectSingleNode("/rss/channel/item/yweather:condition/@temp", xmlnsManager).InnerXml); desc = doc.DocumentElement.SelectSingleNode("/rss/channel/item/description").InnerXml; day = doc.DocumentElement.SelectSingleNode("/rss/channel/item/yweather:forecast/@day", xmlnsManager).InnerXml; date = doc.DocumentElement.SelectSingleNode("/rss/channel/item/yweather:forecast/@date", xmlnsManager).InnerXml; low = Convert.ToInt32(doc.DocumentElement.SelectSingleNode("/rss/channel/item/yweather:forecast/@low", xmlnsManager).InnerXml); high = Convert.ToInt32(doc.DocumentElement.SelectSingleNode("/rss/channel/item/yweather:forecast/@high", xmlnsManager).InnerXml); //use regex in order to extract the icon name from the html script Match m = Regex.Match(desc,regxQry); if(m.Success) { iconPath = m.Value; //add the icon ID to the symbology table DataRow tr = m_symbolTable.Rows.Find(iconCode); if(null == tr) { //get the icon from the website bitmap = DownloadIcon(iconPath, out iconWidth, out iconHeight); //create a new record tr = m_symbolTable.NewRow(); tr[1] = iconCode; tr[3] = iconWidth; tr[4] = iconHeight; tr[6] = bitmap; //update the symbol table. The initialization of the symbol cannot take place in here, since //this code gets executed on a background thread. lock(m_symbolTable) { m_symbolTable.Rows.Add(tr); } } else //get the icon's dimensions from the table { //get the icon's dimensions from the table iconWidth = Convert.ToInt32(tr[3]); iconHeight = Convert.ToInt32(tr[4]); } } else { iconPath = ""; } //test whether the record already exists in the layer's table. if(null == dbr) //in case that the record does not exist { //create a new record dbr = m_table.NewRow(); if (!m_table.Columns[0].AutoIncrement) dbr[0] = Convert.ToInt32(DateTime.Now.Millisecond); //add the item to the table lock (m_table) { dbr[1] = zipCode; dbr[2] = cityName; dbr[3] = lat; dbr[4] = lon; dbr[5] = temp; dbr[6] = condition; dbr[7] = iconPath; dbr[8] = iconCode; dbr[9] = day; dbr[10] = date; dbr[11] = low; dbr[12] = high; dbr[13] = false; dbr[14] = DateTime.Now; m_table.Rows.Add(dbr); } } else //in case that the record exists, just update it { //update the record lock (m_table) { dbr[5] = temp; dbr[6] = condition; dbr[7] = iconPath; dbr[8] = iconCode; dbr[9] = day; dbr[10] = date; dbr[11] = low; dbr[12] = high; dbr[14] = DateTime.Now; dbr.AcceptChanges(); } } base.m_bIsCompiledDirty = true; //fire an event to notify the user that the item has been updated if (OnWeatherItemAdded != null) { WeatherItemEventArgs weatherItemEventArgs = new WeatherItemEventArgs(Convert.ToInt32(dbr[0]), zipCode, lon, lat, iconWidth, iconHeight); OnWeatherItemAdded(this, weatherItemEventArgs); } } catch(Exception ex) { System.Diagnostics.Trace.WriteLine("AddWeatherItem: " + ex.Message); } } #endregion #region IIdentify Members /// <summary> /// Identifying all the weather items falling within the given envelope /// </summary> /// <param name="pGeom"></param> /// <returns></returns> public IArray Identify(IGeometry pGeom) { IEnvelope intersectEnv = new EnvelopeClass(); IEnvelope inEnv; IArray array = new ArrayClass(); //get the envelope from the geometry if(pGeom.GeometryType == esriGeometryType.esriGeometryEnvelope) inEnv = pGeom.Envelope; else inEnv = pGeom as IEnvelope; //reproject the envelope to the source coordsys //this would allow to search directly on the Lat/Lon columns if (null != m_spatialRef && m_mapSpatialRef.FactoryCode != m_layerSRFactoryCode && null != inEnv.SpatialReference) inEnv.Project(base.m_spatialRef); //expand the envelope so that it'll cover the symbol inEnv.Expand(4,4,true); double xmin, ymin, xmax, ymax; inEnv.QueryCoords(out xmin, out ymin, out xmax, out ymax); //select all the records within the given extent string qry = "LON >= " + xmin.ToString() + " AND LON <= " + xmax.ToString() + " AND Lat >= " + ymin.ToString() + " AND LAT <= " + ymax.ToString(); DataRow[] rows = m_table.Select(qry); if(0 == rows.Length) return array; long zipCode; IPropertySet propSet = null; IIdentifyObj idObj = null; IIdentifyObject idObject = null; bool bIdentify = false; foreach(DataRow r in rows) { //get the zipCode zipCode = Convert.ToInt64(r["ZIPCODE"]); //get the properties of the given item in order to pass it to the identify object propSet = this.GetWeatherItem(zipCode); if(null != propSet) { //instantiate the identify object and add it to the array idObj = new RSSWeatherIdentifyObject(); //test whether the layer can be identified bIdentify = idObj.CanIdentify((ILayer)this); if(bIdentify) { idObject = idObj as IIdentifyObject; idObject.PropertySet = propSet; array.Add(idObj); } } } //return the array with the identify objects return array; } private double GetSymbolSize(IDisplay display, int symbolCode) { if (display == null) return 0; double symbolSize = 0; double symbolSizePixels = 0; DataRow r = m_symbolTable.Rows.Find(symbolCode); if (r != null) { symbolSizePixels = Convert.ToDouble(m_symbolSize); // convert the symbol size from pixels to map units ITransformation transform = display.DisplayTransformation as ITransformation; if (transform == null) return 0; double[] symbolDimensions = new double[2]; symbolDimensions[0] = (double)symbolSizePixels; symbolDimensions[1] = (double)symbolSizePixels; double[] symbolDimensionsMap = new double[2]; transform.TransformMeasuresFF(esriTransformDirection.esriTransformReverse, 1, ref symbolDimensionsMap[0], ref symbolDimensions[0]); symbolSize = symbolDimensionsMap[0]; } return symbolSize; } #endregion } }