How to draw a polygon on the screen (ArcObjects .NET 10.6 SDK)

Summary

This topic shows how to draw a polygon using IRubberBand.

Drawing a polygon on the screen

The following code draws a polygon on the screen in the map where the mouse is clicked. The x,y coordinates come from a mousedown click event when the user interacts with the application. In this example, the polygon is not persisted on the screen but is removed after the next screen refresh.

[VB.NET]

Public Sub DrawPolygon(ByVal activeView As ESRI.ArcGIS.Carto.IActiveView)
    
    If activeView Is Nothing Then
        Return
    End If
    
    Dim screenDisplay As ESRI.ArcGIS.Display.IScreenDisplay=activeView.ScreenDisplay
    
    ' Constant.
    screenDisplay.StartDrawing(screenDisplay.hDC, CShort(ESRI.ArcGIS.Display.esriScreenCache.esriNoScreenCache))
    Dim rgbColor As ESRI.ArcGIS.Display.IRgbColor=New ESRI.ArcGIS.Display.RgbColorClass
    rgbColor.Red=255
    
    Dim color As ESRI.ArcGIS.Display.IColor=rgbColor ' Implicit cast.
    Dim simpleFillSymbol As ESRI.ArcGIS.Display.ISimpleFillSymbol=New ESRI.ArcGIS.Display.SimpleFillSymbolClass
    simpleFillSymbol.Color=color
    
    Dim symbol As ESRI.ArcGIS.Display.ISymbol=TryCast(simpleFillSymbol, ESRI.ArcGIS.Display.ISymbol) ' Dynamic cast.
    Dim rubberBand As ESRI.ArcGIS.Display.IRubberBand=New ESRI.ArcGIS.Display.RubberPolygonClass
    Dim geometry As ESRI.ArcGIS.Geometry.IGeometry=rubberBand.TrackNew(screenDisplay, symbol)
    screenDisplay.SetSymbol(symbol)
    screenDisplay.DrawPolygon(geometry)
    screenDisplay.FinishDrawing()
    
End Sub

[C#]

public void DrawPolygon(ESRI.ArcGIS.Carto.IActiveView activeView)
{

    if (activeView == null)
    {
        return ;
    }

    ESRI.ArcGIS.Display.IScreenDisplay screenDisplay=activeView.ScreenDisplay;

    // Constant.
    screenDisplay.StartDrawing(screenDisplay.hDC, (System.Int16)
        ESRI.ArcGIS.Display.esriScreenCache.esriNoScreenCache); // Explicit cast.
    ESRI.ArcGIS.Display.IRgbColor rgbColor=new ESRI.ArcGIS.Display.RgbColorClass();
    rgbColor.Red=255;

    ESRI.ArcGIS.Display.IColor color=rgbColor; // Implicit cast.
    ESRI.ArcGIS.Display.ISimpleFillSymbol simpleFillSymbol=new
        ESRI.ArcGIS.Display.SimpleFillSymbolClass();
    simpleFillSymbol.Color=color;

    ESRI.ArcGIS.Display.ISymbol symbol=simpleFillSymbol as
        ESRI.ArcGIS.Display.ISymbol; // Dynamic cast.
    ESRI.ArcGIS.Display.IRubberBand rubberBand=new
        ESRI.ArcGIS.Display.RubberPolygonClass();
    ESRI.ArcGIS.Geometry.IGeometry geometry=rubberBand.TrackNew(screenDisplay,
        symbol);
    screenDisplay.SetSymbol(symbol);
    screenDisplay.DrawPolygon(geometry);
    screenDisplay.FinishDrawing();
}

Development licensing	Deployment licensing
ArcGIS for Desktop Basic	ArcGIS for Desktop Basic
ArcGIS for Desktop Standard	ArcGIS for Desktop Standard
ArcGIS for Desktop Advanced	ArcGIS for Desktop Advanced
Engine Developer Kit	Engine

How to draw a polygon on the screen

Drawing a polygon on the screen

See Also: