实现MapObject放大，缩小，平移，全图常用功能

在axMap1的MouseDownEvent事件里加入下面代码

代码

          MapObjects2.Rectangle rect;      // 范围
             switch  (axMap1.MousePointer)
            {

                 // 放大
                 case  MapObjects2.MousePointerConstants.moZoomIn:
                    {                        
                        rect  =  axMap1.TrackRectangle(); //得到鼠标拖动范围
                         if  (rect  ==   null   ||  rect.Width  <   0.00005   ||  rect.Height  <   0.00005 )   // 如果选择区域很小，可以认为是 单击、点选
                        {
                            rect  =  axMap1.Extent;
                            rect.ScaleRectangle( 0.5 );   //设置放大比例
                        }
                        axMap1.Extent  =  rect;
                         break ;
                    }

                 // 缩小 
                 case  MapObjects2.MousePointerConstants.moZoomOut:
                    {
                        MapObjects2.Rectangle Tempr;
                        Tempr  =  axMap1.Extent;
                        rect  =  axMap1.TrackRectangle();
                         double  NewSR;
                         if  (rect  ==   null   ||  rect.Width  <   0.00005   ||  rect.Height  <   0.00005 )
                        {
                             if  (axMap1.Extent.Width  /  rect.Width  >  axMap1.Extent.Height  /  rect.Height)
                            {
                                NewSR  =  axMap1.Extent.Height  /  rect.Height;
                            }
                             else
                            {
                                NewSR  =  axMap1.Extent.Width  /  rect.Width;
                            }
                            Tempr.ScaleRectangle(NewSR);
                        }
                         else
                        {
                            Tempr.ScaleRectangle( 2.0 );   //设置缩小比率
                        }
                        axMap1.Extent  =  Tempr;
                         break ;
                    }
                 // 漫游 
                 case  MapObjects2.MousePointerConstants.moPan:
                    {
                        axMap1.Pan();
                         break ;
                    }
           .
           .
           .

 

这里要设置下鼠标的状态，比如在放大按钮的单击事件下加入：

axMap1.MousePointer = MapObjects2.MousePointerConstants.moZoomIn;   //放大，改变鼠标状态

 

全图：

axMap1.Extent = axMap1.FullExtent;