ArcEngine(三)通过MapControl控件实现放大缩小全图漫游

放大

private void 放大ToolStripMenuItem_Click(object sender, EventArgs e)
        {
    
            IEnvelope envelope = new EnvelopeClass();
            envelope = MapControl.Extent;//设置当前的地图范围
            envelope.Expand(0.5, 0.5,true);//使矩形框缩小
            MapControl.Extent = envelope;//把矩形框设置为缩小后的矩形框
            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;//设置当前的地图范围
            envelope.Expand(2, 2, true);//使矩形框变大
            MapControl.Extent = envelope;//把矩形框设置为变大后的矩形框
            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();
        }