[GIS] How to draw one rectangle in ArcObjects

arcobjectscmap-drawingopenlayers-2optimization

Is there button in ArcObjects "draw rectangle" such as in openlayers?

Update

Well, I use this code for drawing:

ESRI.ArcGIS.Display.IScreenDisplay screenDisplay = Map1.ActiveView.ScreenDisplay;
screenDisplay.StartDrawing(screenDisplay.hDC, (System.Int16)
    ESRI.ArcGIS.Display.esriScreenCache.esriNoScreenCache);
ESRI.ArcGIS.Display.IRgbColor rgbColor = new ESRI.ArcGIS.Display.RgbColor();
rgbColor.Red = 255;

ESRI.ArcGIS.Display.IColor color = rgbColor;
ESRI.ArcGIS.Display.ISimpleFillSymbol simpleFillSymbol = new
    ESRI.ArcGIS.Display.SimpleFillSymbol();
simpleFillSymbol.Color = color;

ESRI.ArcGIS.Display.ISymbol symbol = simpleFillSymbol as
    ESRI.ArcGIS.Display.ISymbol;
ESRI.ArcGIS.Display.IRubberBand rubberBand = new
    ESRI.ArcGIS.Display.RubberEnvelope();
ESRI.ArcGIS.Geometry.IGeometry geometry = rubberBand.TrackNew(screenDisplay,
    symbol);
screenDisplay.SetSymbol(symbol);
screenDisplay.DrawRectangle(geometry as ESRI.ArcGIS.Geometry.IEnvelope);
screenDisplay.FinishDrawing();
...
ArcGisToolbar.CurrentTool.Deactivate();
ArcGisToolbar.CurrentTool = null;
ICommand command = this.ArcGisToolbar.CommandPool.get_Command(3); // button "pan"
Map1.CurrentTool = (ITool)command;

But there is a problem. When I activate this instrument (button "select") again, I already start selecting the area (from the point, where I begin drawing the polygon)

Best Answer

First of all I would use:

ESRI.ArcGIS.Display.IRubberBand rubberBand = new ESRI.ArcGIS.Display.RubberPolygonClass();

instead of using the RubberEnvelope method

then later do:

screenDisplay.DrawPolygon(geometry);

instead of screenDisplay.DrawRectangle(...)

see if that gets you further.

When getting Feedback for the rectangle via mouse Events I'd do the following: In OnMouseDown use:

INewEnvelopeFeedback envFb = new NewEnvelopeFeedback();
            envFb.Display = activeView.ScreenDisplay;
            envFb.Start(pt);

assign the envFb to a IDisplayfeedback df

In OnMouseMove do:

df.MoveTo(pt)

In OnMouseUp do:

IEnvelope env = ((INewEnvelopeFeedback)df).Stop();

pt is always the position of your mouse cursor.

Related Solutions

ArcObjects – Replicating ArcMap’s Point Sketch Geometry Editing with Feature Templates

I haven't tested this much, but it seems to work ...

public class TestButton : ESRI.ArcGIS.Desktop.AddIns.Button
{
    public TestButton()
    {
    }

    protected override void OnClick()
    {
        try
        {
            var fLayer = StartEditing();
            if (fLayer != null)
            {
                ShowTemplate(fLayer);
                // id discovered using Categories.exe ...
                ShowDockWin("esriEditor.CreateFeatureDockWin");
            }        
        }
        catch (Exception ex)
        {
            MessageBox.Show(ex.Message);
        }
    }

    private static void ShowDockWin(string id)
    {
        var dockWin = GetDockWindow(id);
        if (dockWin != null)
        {
            if (!dockWin.IsVisible())
                dockWin.Show(true);
        }
    }

    private static IFeatureLayer StartEditing()
    {
        IEditor editor = ArcMap.Application.FindExtensionByName("ESRI Object Editor") as IEditor;
        IFeatureLayer fLayer = null;
        if (editor.EditState == esriEditState.esriStateNotEditing)
        {
            fLayer = ArcMap.Document.FocusMap.get_Layer(0) as IFeatureLayer;
            if (fLayer == null)
            {
                MessageBox.Show("first layer is not a featurelayer");
                return null;
            }
            editor.StartEditing(((IDataset)fLayer).Workspace);
        }
        else
            MessageBox.Show("you are already editing");
        return fLayer;
    }

    private static void ShowTemplate(IFeatureLayer fLayer)
    {
        var ed3 = ArcMap.Application.FindExtensionByName("ESRI Object Editor") as IEditor3;
        var template = FindTemplate(ed3, fLayer);
        if (template == null)
        {
            IEditTemplateFactory factory = new EditTemplateFactoryClass();
            template = factory.Create(fLayer.Name, fLayer);
            ed3.AddTemplates(ToArray(template));
        }
        if(ed3.CurrentTemplate != template)
            ed3.CurrentTemplate = template;
    }

    private static IArray ToArray(params object[] args)
    {
        IArray array = new ArrayClass();
        foreach (object o in args)
            array.Add(o);
        return array;
    }

    private static IEditTemplate FindTemplate(IEditor3 ed3, ILayer layer)
    {
        for (int i = 0; i < ed3.TemplateCount; i++)
        {
            if (ed3.get_Template(i).Layer == layer)
            {
                ed3.CurrentTemplate = ed3.get_Template(i);
                return ed3.get_Template(i);
            }
        }
        return null;
    }

    private static IDockableWindow GetDockWindow(string id)
    {
        UID uid = new UIDClass();
        try
        {
            uid.Value = id;
        }
        catch
        {
            MessageBox.Show("unable to create dockable window for " + id);
        }
        var dwm = ArcMap.Application as IDockableWindowManager;
        var dockWin = dwm.GetDockableWindow(uid);
        return dockWin;
    }

    protected override void OnUpdate()
    {
    }
}

[GIS] How to determine if a LYR file has more than one Layer using ArcObjects

Query interface from ILayerFile.Layer to ICompositeLayer to determine whether the layer is a group/composite layer.

If the QI succeded, check ICompositeLayer.Count to see if it has any sublayers.

e.g.:

ILayerFile layerFile = new LayerFileClass();
layerFile.Open(layerFilePath);
ICompositeLayer compositeLayer = layerFile.Layer as ICompositeLayer;
if (compositeLayer != null && compositeLayer.Count > 0)
{
    // do something with the sublayers
}

You can then access a sublayer by its index (probably using a for loop) using the ICompositeLayer.Layer property, which, because it takes an argument should be called as a method in .NET, e.g.: compositeLayer.get_Layer(i).

If you think the layer file might have multiple nested group layers, you would want to write a recursive function to loop through each sublayer and recurse if it is also a composite layer or do something else with it if not.

Best Answer

Related Solutions

ArcObjects – Replicating ArcMap’s Point Sketch Geometry Editing with Feature Templates

[GIS] How to determine if a LYR file has more than one Layer using ArcObjects

Related Question