How to make a line callout

Making a line callout

1. Create the background fill symbol.
2. Create the line symbol used as the leader line.
3. Create the line symbol used as the accent bar.
4. Create the callout.

Public Sub LineCallout()
    ' Create the background fill symbol.
    Dim backgroundRgbColorCls As ESRI.ArcGIS.Display.IRgbColor=New ESRI.ArcGIS.Display.RgbColorClass
    backgroundRgbColorCls.Red=255
    Dim simpleFillSymbolCls As ESRI.ArcGIS.Display.ISimpleFillSymbol=New ESRI.ArcGIS.Display.SimpleFillSymbolClass
    With simpleFillSymbolCls
        .Color=backgroundRgbColorCls
        .Style=ESRI.ArcGIS.Display.esriSimpleFillStyle.esriSFSSolid
    End With
    
    ' Create the line symbol used as the leader line.
    Dim leaderlineRgbColorCls As ESRI.ArcGIS.Display.IRgbColor=New ESRI.ArcGIS.Display.RgbColorClass
    leaderlineRgbColorCls.Blue=255
    Dim leaderlineSimpleLineSymbolCls As ESRI.ArcGIS.Display.ISimpleLineSymbol=New ESRI.ArcGIS.Display.SimpleLineSymbolClass
    With leaderlineSimpleLineSymbolCls
        .Color=leaderlineRgbColorCls
        .Width=2
    End With
    
    ' Create the line symbol used as the accent bar.
    Dim accentbarRgbColorCls As ESRI.ArcGIS.Display.IRgbColor=New ESRI.ArcGIS.Display.RgbColorClass
    accentbarRgbColorCls.Green=255
    Dim accentbarSimpleLineSymbolCls As ESRI.ArcGIS.Display.ISimpleLineSymbol=New ESRI.ArcGIS.Display.SimpleLineSymbolClass
    With accentbarSimpleLineSymbolCls
        .Color=accentbarRgbColorCls
    End With
    
    ' Create the callout.
    Dim lineCalloutCls As ESRI.ArcGIS.Display.ILineCallout=New ESRI.ArcGIS.Display.LineCalloutClass
    With lineCalloutCls
        .Style=ESRI.ArcGIS.Display.esriLineCalloutStyle.esriLCSFourPoint
        .Border=simpleFillSymbolCls
        .AccentBar=accentbarSimpleLineSymbolCls
        .LeaderLine=leaderlineSimpleLineSymbolCls
    End With
    
End Sub

public void LineCallout()
{
    // Create the background fill symbol.
    ESRI.ArcGIS.Display.IRgbColor backgroundRgbColorCls=new
        ESRI.ArcGIS.Display.RgbColorClass();
    backgroundRgbColorCls.Red=255;
    ESRI.ArcGIS.Display.ISimpleFillSymbol simpleFillSymbolCls=new
        ESRI.ArcGIS.Display.SimpleFillSymbolClass();
    simpleFillSymbolCls.Color=backgroundRgbColorCls;
    simpleFillSymbolCls.Style=ESRI.ArcGIS.Display.esriSimpleFillStyle.esriSFSSolid;

    // Create the line symbol used as the leader line.
    ESRI.ArcGIS.Display.IRgbColor leaderlineRgbColorCls=new
        ESRI.ArcGIS.Display.RgbColorClass();
    leaderlineRgbColorCls.Blue=255;
    ESRI.ArcGIS.Display.ISimpleLineSymbol leaderlineSimpleLineSymbolCls=new
        ESRI.ArcGIS.Display.SimpleLineSymbolClass();
    leaderlineSimpleLineSymbolCls.Color=leaderlineRgbColorCls;
    leaderlineSimpleLineSymbolCls.Width=2;

    // Create the line symbol used as the accent bar.
    ESRI.ArcGIS.Display.IRgbColor accentbarRgbColorCls=new
        ESRI.ArcGIS.Display.RgbColorClass();
    accentbarRgbColorCls.Green=255;
    ESRI.ArcGIS.Display.ISimpleLineSymbol accentbarSimpleLineSymbolCls=new
        ESRI.ArcGIS.Display.SimpleLineSymbolClass();
    accentbarSimpleLineSymbolCls.Color=accentbarRgbColorCls;

    // Create the callout.
    ESRI.ArcGIS.Display.ILineCallout lineCalloutCls=new
        ESRI.ArcGIS.Display.LineCalloutClass();
    lineCalloutCls.Style=ESRI.ArcGIS.Display.esriLineCalloutStyle.esriLCSFourPoint;
    lineCalloutCls.Border=simpleFillSymbolCls;
    lineCalloutCls.AccentBar=accentbarSimpleLineSymbolCls;
    lineCalloutCls.LeaderLine=leaderlineSimpleLineSymbolCls;
}

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