c#/arcengine 屏幕坐标转换WG84坐标

g.DrawLine(Pens.Blue, pt1, pt2);

IPoint pt11 = new ESRI.ArcGIS.Geometry.PointClass();
        pt11.X = pt1.X;
        pt11.Y = pt1.Y;         
        IPoint pt21 = new ESRI.ArcGIS.Geometry.PointClass();
        pt21.X = pt2.X;
        pt21.Y = pt2.Y;          
        pts.AddPoint(pt11,   missing,   missing);
        pts.AddPoint(pt21, missing, missing);   

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