地图定位实现，地图平移自动

问题1：当点击某一条数据时将实现地图定位功能，但要如何才能控制定位的缩放呢，按几何对象的大小缩放不是很好，今天特意去观察了下百度，发现百度地图中不管几何对象都大，定位时都是控制了地图的缩放的，故本人实现如下

 1  /// <summary>
 2         /// 使用矩形对象获取定位矩形对象
 3         /// </summary>
 4         /// <param name="enveLope">矩形实例</param>
 5         /// <param name="dScale">定位时,定位信息X、Y最大最小值所占屏幕宽度比例,取值范围为0-1（不包含0包含1,否则将返回原矩形对象） </param>
 6         /// <param name="mindistance">如果矩形实例中xy的最大差值小于这个值,定位将采用这个默认的xy差值进行缩放，默认值为60.0</param>
 7         /// <returns></returns>
 8         public static Geometry GetZoomToGeometry(Envelope enveLope, double dScale, double mindistance)
 9         {
10             if (mindistance <= 0.0) mindistance = 60.0;
11             if (dScale <= 0.0 || dScale > 1.0) return enveLope;
12             double widthX = enveLope.XMax - enveLope.XMin, hightY = enveLope.YMax - enveLope.YMin;
13             if (widthX < mindistance && hightY < mindistance)
14             {
15                 MapPoint minPoint = new MapPoint(enveLope.GetCenter().X - mindistance, enveLope.GetCenter().Y - mindistance);
16                 MapPoint maxPoint = new MapPoint(enveLope.GetCenter().X + mindistance, enveLope.GetCenter().Y + mindistance);
17                 return new Envelope(minPoint, maxPoint);
18             }
19             else
20             {
21                 double xVaue = (widthX / 2.0) / dScale; double yValue = (hightY / 2.0) /dScale;
22                 MapPoint minPoint = new MapPoint(enveLope.GetCenter().X - xVaue, enveLope.GetCenter().Y - yValue);
23                 MapPoint maxPoint = new MapPoint(enveLope.GetCenter().X + xVaue, enveLope.GetCenter().Y + yValue);
24                 return new Envelope(minPoint, maxPoint);
25             }
26         }

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