ArcEngine (3) zoom in and zoom out through the MapControl control to achieve full-image roaming

放大

private void 放大ToolStripMenuItem_Click(object sender, EventArgs e)
        {
    
            IEnvelope envelope = new EnvelopeClass();
            envelope = MapControl.Extent;//Set the current map extent
            envelope.Expand(0.5, 0.5,true);//make the rectangle smaller
            MapControl.Extent = envelope;//Set the rectangle to the reduced rectangle
            MapControl.Refresh();//刷新地图
        }

缩小

private void 缩小ToolStripMenuItem_Click(object sender, EventArgs e)
        {
    
            IEnvelope envelope = new EnvelopeClass();
            envelope = MapControl.Extent;//Set the current map extent
            envelope.Expand(2, 2, true);//Make the rectangle box bigger
            MapControl.Extent = envelope;//Set the rectangle to the enlarged rectangle
            MapControl.Refresh();//刷新地图
        }

全图

private void 全图ToolStripMenuItem_Click(object sender, EventArgs e)
        {
    
            MapControl.Extent = MapControl.FullExtent;
        }

漫游

private void 漫游ToolStripMenuItem_Click(object sender, EventArgs e)
        {
    
            MapControl.Pan();
        }