AE创建气泡式的提示框方法

 public void CreateTextElment(double x, double y)
        {
            IPoint pPoint = new PointClass();
            IMap pMap = axMapControl1.Map;
            IActiveView pActiveView = pMap as IActiveView;
            IGraphicsContainer pGraphicsContainer;
            IElement pElement = new MarkerElementClass();
            IElement pTElement = new TextElementClass();
            pGraphicsContainer = (IGraphicsContainer)pActiveView;
            IFormattedTextSymbol pTextSymbol = new TextSymbolClass();
            IBalloonCallout pBalloonCallout = CreateBalloonCallout(x, y);
            IRgbColor pColor = new RgbColorClass();
            pColor.Red = 150;
            pColor.Green = 0;
            pColor.Blue = 0;
            pTextSymbol.Color = pColor;
            ITextBackground pTextBackground;
            pTextBackground = (ITextBackground)pBalloonCallout;
            pTextSymbol.Background = pTextBackground;
            ((ITextElement)pTElement).Symbol = pTextSymbol;
            ((ITextElement)pTElement).Text = "测试";
            pPoint.X = x + 42;
            pPoint.Y = y + 42;
            pTElement.Geometry = pPoint;
            pGraphicsContainer.AddElement(pTElement, 1);
            pActiveView.PartialRefresh(esriViewDrawPhase.esriViewGraphics, null, null);
        }
       
        public IBalloonCallout CreateBalloonCallout(double x, double y)
        {
            IRgbColor pRgbClr = new RgbColorClass();
            pRgbClr.Red = 255;
            pRgbClr.Blue = 255;
            pRgbClr.Green = 255;
            ISimpleFillSymbol pSmplFill = new SimpleFillSymbolClass();
            pSmplFill.Color = pRgbClr;
            pSmplFill.Style. = esriSimpleFillStyle.esriSFSSolid;
            IBalloonCallout pBllnCallout = new BalloonCalloutClass();
            pBllnCallout.Style. = esriBalloonCalloutStyle.esriBCSRectangle;
            pBllnCallout.Symbol = pSmplFill;
            pBllnCallout.LeaderTolerance = 1;
            IPoint pPoint = new ESRI.ArcGIS.Geometry.PointClass();
            pPoint.X = x;
            pPoint.Y = y;
            pBllnCallout.AnchorPoint = pPoint;
            return pBllnCallout;
        }