放大 缩小

概述case "放大": MyDrawObject.IsEnabled = true; _toolMode = "zoomin"; break; case "缩小": MyDrawObject.IsEnabled

 case "放大":                    MyDrawObject.IsEnabled = true;                    _toolMode = "zoomin";                    break;                case "缩小":                    MyDrawObject.IsEnabled = true;                    _toolMode = "zoomout";                    break;

 voID MyDrawObject_DrawComplete(object sender,DrawEventArgs e)        {            if (_toolMode == "zoomin")            {                MyMap.ZoomTo(e.Geometry as ESRI.ArcGIS.ClIEnt.Geometry.Envelope);            }            else if (_toolMode == "zoomout")            {                Envelope currentExtent = MyMap.Extent;                Envelope zoomBoxExtent = e.Geometry as Envelope;                MapPoint zoomBoxCenter = zoomBoxExtent.GetCenter();                double whRatioCurrent = currentExtent.WIDth / currentExtent.Height;                double whRatioZoomBox = zoomBoxExtent.WIDth / zoomBoxExtent.Height;                Envelope newEnv = null;                if (whRatioZoomBox > whRatioCurrent)                // use wIDth                {                    double mapWIDthPixels = MyMap.WIDth;                    double multiplIEr = currentExtent.WIDth / zoomBoxExtent.WIDth;                    double newWIDthMapUnits = currentExtent.WIDth * multiplIEr;                    newEnv = new Envelope(new MapPoint(zoomBoxCenter.X - (newWIDthMapUnits / 2),zoomBoxCenter.Y),new MapPoint(zoomBoxCenter.X + (newWIDthMapUnits / 2),zoomBoxCenter.Y));                }                else                // use height                {                    double mapHeightPixels = MyMap.Height;                    double multiplIEr = currentExtent.Height / zoomBoxExtent.Height;                    double newHeightmapUnits = currentExtent.Height * multiplIEr;                    newEnv = new Envelope(new MapPoint(zoomBoxCenter.X,zoomBoxCenter.Y - (newHeightmapUnits / 2)),new MapPoint(zoomBoxCenter.X,zoomBoxCenter.Y + (newHeightmapUnits / 2)));                }                if (newEnv != null)                    MyMap.ZoomTo(newEnv);            }        }

  MyDrawObject = new Draw(MyMap)            {                FillSymbol = LayoutRoot.Resources["DefaultFillSymbol"] as ESRI.ArcGIS.ClIEnt.Symbols.FillSymbol,DrawMode = DrawMode.Rectangle            };            MyDrawObject.DrawComplete += new EventHandler<DrawEventArgs>(MyDrawObject_DrawComplete);

总结

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