arcengine之基本操作

拉框放大：

            axmap1.MousePointer = esriControlsMousePointer.esriPointerZoomIn;
            IEnvelope IEnvTrc;
            IEnvTrc = axmap1.TrackRectangle();
            axmap1.Extent = IEnvTrc;    

平移：

            axmap1.MousePointer = esriControlsMousePointer.esriPointerPageZoomOut;
            axmap1.Pan();

点击放大（缩小可以更改参数）

            IEnvelope pEnvelope;
            pEnvelope = axmap1.Extent;
            pEnvelope.Expand(0.5, 0.5, true);
            axmap1.Extent = pEnvelope;
            axmap1.Refresh();