js代码实现如下：
function DrawPolyline()
{
var mxOcx = document.all.item("MxDrawXCtrl");
mxOcx.focus();
var point1 = mxOcx.GetPoint(false,0,0,"\n 点取开始点:");
if(point1 == null)
{
return;
}
//mxOcx.PathMoveToEx(point1.x,point1.y,10,10,0.0);
mxOcx.PathMoveTo(point1.x,point1.y);
var point2 = mxOcx.GetPoint(true,point1.x,point1.y,"\n 点取下一个:");
if(point2 == null)
{
return;
}
var tmpobj = new Array();
//mxOcx.PathLineToEx(point2.x,point2.y,10,10,0.0);
mxOcx.PathLineTo(point2.x,point2.y);
var iCount = 0;
var id = mxOcx.DrawLine(point1.x,point1.y,point2.x,point2.y);
tmpobj[iCount] = id;
iCount = iCount + 1;
point1 = point2;
while(true)
{
var point2 = mxOcx.GetPoint(true,point1.x,point1.y,"\n 点取下一个:");
if(point2 == null)
{
break;
}
mxOcx.PathLineTo(point2.x,point2.y);
var id = mxOcx.DrawLine(point1.x,point1.y,point2.x,point2.y);
tmpobj[iCount] = id;
iCount = iCount + 1;
point1 = point2;
}
var i = 0;
for(;i < iCount;i++)
{
mxOcx.Erase(tmpobj[i] );
}
var lId = mxOcx.DrawPathToPolyline();
// 把新绘的pl线变成双线。
var param = mxOcx.Call("Mx_NewResbuf","");
param.AddLong(lId);
// 双线的宽度。
var lineWidth = 2;
param.AddDouble(lineWidth);
// 调用变双线函数。
var ret = mxOcx.CallEx("ExApp_MakeDoubleLine",param);
if(ret.AtString(0) == "Ok")
{
// 返回的绘制的双线对象id.
alert(ret.AtLong(1));
}
// 删除旧的pl线。
mxOcx.Erase(lId);
}
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