David,I have a working sample that is based on a Java Tool Add-in, but I believe you can tailor it to your data stream of geometries.I launch ArcMap 10.0 SP5I add a layer "ESRI_StreetMap_World_2D" from the services.argisonline.comI click my Add-in Tool and start clicking in the map.Initially, for the first five seconds, nothing shows up in the map where I've clicked. After five seconds pass, the previous click points show up and as I click, the current points are added to GraphicTracker for the next 5 seconds, then disappear for 5 seconds, and so on.I started just above the peninsula and went counter clockwise, zig zagged until I came back around.[ATTACH=CONFIG]22281[/ATTACH]Granted, I did not keep this process up for very long. I did go throuh about 5 or 6 suspend/unsuspend iterations though without any problems.
import java.awt.event.MouseEvent;
import java.io.IOException;
import java.util.Timer;
import java.util.TimerTask;
import com.esri.arcgis.addins.desktop.Tool;
import com.esri.arcgis.arcmapui.IMxDocument;
import com.esri.arcgis.carto.IActiveView;
import com.esri.arcgis.display.IDisplayTransformation;
import com.esri.arcgis.display.IScreenDisplay;
import com.esri.arcgis.display.ISymbol;
import com.esri.arcgis.display.RgbColor;
import com.esri.arcgis.display.SimpleMarkerSymbol;
import com.esri.arcgis.display.esriSimpleMarkerStyle;
import com.esri.arcgis.enginecore.GraphicTracker;
import com.esri.arcgis.enginecore.IGraphicTrackerSymbol;
import com.esri.arcgis.framework.IApplication;
import com.esri.arcgis.geometry.IGeoTransformation;
import com.esri.arcgis.geometry.IGeometry;
import com.esri.arcgis.geometry.IPoint;
import com.esri.arcgis.geometry.ISpatialReference;
import com.esri.arcgis.geometry.Point;
import com.esri.arcgis.geometry.SpatialReferenceEnvironment;
import com.esri.arcgis.interop.AutomationException;
public class GTTool extends Tool {
/**
* Called when the tool is activated by clicking it.
*
* @exception java.io.IOException if there are interop problems.
* @exception com.esri.arcgis.interop.AutomationException if the component throws an ArcObjects exception.
*/
@Override
public void activate() throws IOException, AutomationException {
}
@Override
public void init(IApplication app) throws IOException, AutomationException {
super.init(app);
mxDoc = (IMxDocument)app.getDocument();
}
@Override
public void mousePressed(MouseEvent mouseEvent) {
super.mousePressed(mouseEvent);
try {
// Create a point based on the user's mouse click.
Point p1 = new Point();
p1.putCoords((double)mouseEvent.getX(), (double)mouseEvent.getY());
if(gt == null){
// Instantiate a GraphicTracker and initialize it once.
// GraphicTracker by default will refresh after each geometry add
gt = new GraphicTracker();
gt.initialize(mxDoc.getActiveView().getFocusMap());
// Tell the GraphicTracker that we want to suspend auto refresh.
gt.setSuspendUpdate(true);
// Create a timer task to toggle the automatic graphic tracker refresh for the duration in milliseconds.
// intially for 5 seconds and every 5 seconds after that.
Timer timer = new Timer();
timer.scheduleAtFixedRate(new UnSuspendTimerTask(), 5000, 5000);
}
// Create a color object that is red
RgbColor color = new RgbColor();
color.setRed(255);
// Create a simplemarkersymbol to be used as the symbol for the graphic placed by GraphicTracker
twoDSymbol = new SimpleMarkerSymbol();
twoDSymbol.setStyle(esriSimpleMarkerStyle.esriSMSSquare);
twoDSymbol.setSize(4);
twoDSymbol.setColor(color);
// Tell the GraphicTracker to create a symbol and assign it to the GraphicTrackerSymbol object
gts = gt.createSymbol((ISymbol)twoDSymbol, null);
// Conver the user's map click point to something useful..
Point mapPoint = (Point)getMapCoordinatesFromScreenCoordinates(p1, mxDoc.getActiveView());
// Declare ESRI named constants for projecting data between WGS1984 and NAD83 HARN AZ Central
int wgs84 = com.esri.arcgis.geometry.esriSRGeoCSType.esriSRGeoCS_WGS1984;
int geotransformId = com.esri.arcgis.geometry.esriSRGeoTransformationType.esriSRGeoTransformation_NAD1983_To_WGS1984_1;
int geotransformDirection = com.esri.arcgis.geometry.esriTransformDirection.esriTransformForward;
// Create a SpatialReferenceEnvironment, ISpatialReference and IGeoTransformation
SpatialReferenceEnvironment spatialRef = new SpatialReferenceEnvironment();
ISpatialReference gcswgs84 = spatialRef.createGeographicCoordinateSystem(wgs84);
IGeoTransformation iGeoTransformation = (IGeoTransformation)spatialRef.createGeoTransformation(geotransformId);
// Set the spatial reference of the point to the spatial reference of the map window (activeView)
mapPoint.setSpatialReferenceByRef(mxDoc.getActiveView().getScreenDisplay().getDisplayTransformation().getSpatialReference());
// Project the point from whatever the activeView spatial reference is to GCS_WGS_1984 World projection - Decimal Degrees
mapPoint.projectEx(gcswgs84, geotransformDirection, iGeoTransformation, false, 0.0, 0.0);
// Add the geometry and symbol to the GraphicTracker
gt.add((IGeometry) mapPoint, gts);
} catch (AutomationException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} catch (Exception e) {
e.printStackTrace();
}
}
public static IPoint getMapCoordinatesFromScreenCoordinates(IPoint screenPoint, IActiveView activeView)throws Exception{
if (screenPoint == null || screenPoint.isEmpty() || activeView == null)
return null;
IScreenDisplay screenDisplay = activeView.getScreenDisplay();
IDisplayTransformation displayTransformation = screenDisplay.getDisplayTransformation();
// Returns a point in whatever coordinate system the DataFrame is set to
return displayTransformation.toMapPoint((int)screenPoint.getX(), (int)
screenPoint.getY());
}
public static GraphicTracker gt = null;
private IGraphicTrackerSymbol gts;
private SimpleMarkerSymbol twoDSymbol;
public static IMxDocument mxDoc;
}
class UnSuspendTimerTask extends TimerTask{
@Override
public void run() {
try {
if(GTTool.gt.isSuspendUpdate()){
// make it auto refresh
GTTool.gt.setSuspendUpdate(false);
} else {
// don't make it auto refresh
GTTool.gt.setSuspendUpdate(true);
}
} catch (AutomationException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
}
