Question

主要用到函数说明：

函数名：IMxDrawSelectionSet::SelectByPolygon

在多个点组合的闭合区域里，构造选择集。详细说明如下：

参数	说明
[in] IMxDrawPoints* points	组成闭合区域的点集合
[in,defaultvalue(NULL)] IMxDrawResbuf* filterData	过滤条件
Mode	构造选择集方式

c#中使用如下：

private void SelectByPolygon()
{
    MxDrawPoint pt1 = (MxDrawPoint)axMxDrawX1.NewPoint();
    pt1.x = -200;
    pt1.y = -200;
    MxDrawPoint pt2 = (MxDrawPoint)axMxDrawX1.NewPoint();
    pt2.x = 200;
    pt2.y = 200;
    MxDrawPoint pt3 = (MxDrawPoint)axMxDrawX1.NewPoint();
    pt3.x = 200;
    pt3.y = -200;
    MxDrawPoint pt4 = (MxDrawPoint)axMxDrawX1.NewPoint();
    pt4.x = -200;
    pt4.y = 200;
    MxDrawPoints points = new MxDrawPoints();
    points.Add2(pt1);
    points.Add2(pt2);
    points.Add2(pt3);
    points.Add2(pt4);
    //创建选择集
    MxDrawSelectionSet ss = new MxDrawSelectionSet();
    //创建过滤对象
    MxDrawResbuf spFilte = new MxDrawResbuf();
    //在多个点组合的闭合区域里，构造选择集
    ss.SelectByPolygon(MCAD_McSelect.mcSelectionSetCrossingPolygon, points, spFilte);
    for (int i = 0; i < ss.Count; i++)
    {
        MxDrawEntity ent = ss.Item(i);
        MessageBox.Show(ent.ObjectName);
    }
}