MapX创建线图元

 

void   CLmtestView::DrawLine(CMapXLayer* layer, Position startPoint, Position endPoint)//画轨迹线
{
    CMapXStyle lineSty;   //线图元

    COleVariant vt;
    vt.vt=VT_DISPATCH;

    CMapXFeature newFeature;    //新建图元

    CMapXPoint pt;               //点图元
    CMapXPoints pts;             //点集合
    pt.CreateDispatch(pt.GetClsid());
    pts.CreateDispatch(pts.GetClsid());


    pts.RemoveAll();
    pt.Set(startPoint.m_longtidude, startPoint.m_latitude);   //线的起点
    pts.Add(pt);
    pt.Set(endPoint.m_longtidude,endPoint.m_latitude);        //线的终点
    pts.Add(pt);

    vt.pdispVal=pts.m_lpDispatch;
    vt.pdispVal->AddRef();//此句不可缺

    CMapXFeature sidefeature=m_map.GetFeatureFactory().CreateLine(vt);  //创建线图元

    lineSty=sidefeature.GetStyle();  //设置线图元的风格
    lineSty.SetLineColor(miColorBlue);
    lineSty.SetLineStyle(36);
    sidefeature.SetStyle(lineSty.m_lpDispatch);
    sidefeature=(*layer).AddFeature(sidefeature);  //将创建的图元加入到图层中
    sidefeature.Update();
    long sid=sidefeature.GetFeatureID();//过去图元的ID号，此ID号只能读，不能写
    m_sidearray.Add(sid);  //该数组保存着线图元的ID号
    m_map.Refresh();
}

 

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