ArcEngine中使用上下左右键移动地图

转自愿文ArcEngine中使用上下左右键移动地图

因项目需要，需对mapcontrol控件响应上下左右键，从网上找的方法都一样，都值提到了需要设置axMapControl1的KeyIntercept属性为1，但这样做的结果是，除了自己在onkeydown中设置的平移1/10个屏幕大小外，系统还会有一个默认的平移操作。经研究发现，设置axMapControl1的autokeyboardscrolling属性为false即可屏蔽系统默认的对上下左右键的相应方法。

axMapControl1.AutoKeyBoardScrolling=false;  
axMapControl1.KeyIntercept = 1;  
private void axMapControl1_OnKeyDown(object sender, ESRI.ArcGIS.MapControl.IMapControlEvents2_OnKeyDownEvent e)  
{  
    switch (e.keyCode)  
    {  
        case (int)System.Windows.Forms.Keys.Up:  
            PanMap(0d, 0.5d);  
            break;  
        case (int)System.Windows.Forms.Keys.Down:  
            PanMap(0d, -0.5d);  
            break;  
        case (int)System.Windows.Forms.Keys.Left:  
            PanMap(-0.5d, 0d);  
            break;  
        case (int)System.Windows.Forms.Keys.Right:  
            PanMap(0.5d, 0d);  
            break;  
    }  
}  
  
private void PanMap(double ratioX, double ratioY)  
{  
    //Pans map by amount specified given in a fraction of the extent e.g. rationX=0.5, pan right by half a screen   
    IEnvelope envelope = axMapControl1.Extent;  
    double h = envelope.Width;  
    double w = envelope.Height;  
    envelope.Offset(h * ratioX, w * ratioY);  
    axMapControl1.Extent = envelope;  
}