Question

调用控件函数：DrawCustomEntity 直接在图上，绘制自定义实体，如下js代码：

function  button2_Click()
    {
        // 调用DrawCustomEntity绘制一个自定义实体，实体类型字符串为:DrawCustEntity
        var ent = mxOcx.DrawCustomEntity("DrawCustEntity","");

        // 开始设置自定义实体的属性。
        ent.BeginSetValue();
        // 设置属性Width
        ent.SetDouble("Width", 30);
        var pt1 = mxOcx.NewPoint();
        pt1.x = 10;
        pt1.y = 10;
        var pt2 = mxOcx.NewPoint();
        pt2.x = 100;
        pt2.y = 200;
        // 设置属性Point1,Point2
        ent.SetPoint("Point1", pt1);
        ent.SetPoint("Point2", pt2);
        ent.SetLong("Count", 2);
        // 结束设置自定义实体的属性。
        ent.EntSetValue();
        // 更新显示
        mxOcx.UpdateDisplay();
    }

下面函数MyDrawMline，用来具体绘制自定义实体，将用在后面的事件中调用。

 // MyDrawMline，用来绘制我们的自定义实体
    function MyDrawMline(pWorldDraw, pCustomEntity, curPt)
    {        var mxOcx = document.getElementById("MxDrawXCtrl");
        // 取自定义实体的端点数目。
        if (!pCustomEntity.IsHave("Count"))
            return;
        var lCount = pCustomEntity.GetLong("Count");

        var tmpPl = mxOcx.NewEntity("IMxDrawPolyline");
        //var tmpPl = new MxDrawPolyline();

        for (var i = 0; i < lCount; i++)
        {
            var sName;
            sName = "Point" + (i + 1).toString();
            if (!pCustomEntity.IsHave(sName))
                break;
            // 取自定义实体的端点坐标。
            var pt = pCustomEntity.GetPoint(sName);
            // 把端点坐标，传给pl线，用于生成双线。
            tmpPl.AddVertexAt(pt);
        }
        if (curPt != null)
            tmpPl.AddVertexAt(curPt);
        if (tmpPl.NumVerts < 2)
        {
            // 端点数少于2就，不构成直线，就不需要显示。
            return;
        }
        // 求pl线，开始点的导数.
        var vecFx = tmpPl.GetFirstDeriv2(tmpPl.GetStartParam());
        if (!vecFx)
        return;

         if (vecFx.IsZeroLength())
             return;

        // 把向量旋转90度.
        vecFx.RotateByXyPlan(3.14159265 / 2.0);
        vecFx.Normalize();
        //  得到双线的宽度属性。
        var dWidth = pCustomEntity.GetDouble("Width");
        vecFx.Mult(dWidth);
        var startPt = tmpPl.GetStartPoint();
        // 向pl线，两个方向偏移，
        var offsetPt1 = mxOcx.NewPoint();
        offsetPt1.x = startPt.x;
        offsetPt1.y = startPt.y;
        offsetPt1.Add(vecFx);
        var offsetPt2 = mxOcx.NewPoint();
        offsetPt2.x = startPt.x;
        offsetPt2.y = startPt.y;
        offsetPt2.Sum(vecFx);
        var text = mxOcx.NewEntity("IMxDrawText");
        text.TextString = "Test";
        text.Height = 100;
        text.Position = startPt;
        text.AlignmentPoint = startPt;

        var pt1 = mxOcx.NewPoint();
        var pt2 = mxOcx.NewPoint();

        text.GetBoundingBox(pt1,pt2);
        var pt3 = mxOcx.NewPoint();
        pt3.x = pt1.x;
        pt3.y = pt2.y;
        var pt4 = mxOcx.NewPoint();
        pt4.x = pt2.x;
        pt4.y = pt1.y;
        var pts = mxOcx.NewComObject("IMxDrawPoints");
        pts.Add(pt1.x, pt1.y,0);
        pts.Add(pt3.x, pt3.y,0);
        pts.Add(pt2.x, pt2.y,0);
        pts.Add(pt4.x, pt4.y,0);
        var lDraworder = pWorldDraw.Draworder;
        pWorldDraw.Draworder = lDraworder + 1;
        pWorldDraw.DrawWipeout(pts);
        pWorldDraw.Draworder = lDraworder + 2;
        pWorldDraw.DrawEntity(text);
        pWorldDraw.Draworder = lDraworder;
        {
            var newobj =tmpPl.OffsetCurves2(dWidth, offsetPt1);
            if (newobj)
            {
                for (var j = 0; j < newobj.Count; j++)
                {
                    var tmpObj = newobj.AtObject(j);
                    if (tmpObj == null)
                        continue;
                    pWorldDraw.DrawEntity(tmpObj);
                }
                newobj.RemoveAll();
            }
        }
        {

            var newobj =tmpPl.OffsetCurves2(dWidth, offsetPt2);

            if (newobj)
            {
                for (var j = 0; j < newobj.Count; j++)
                {
                    var tmpObj = newobj.AtObject(j);
                    if (tmpObj == null)
                        continue;
                    pWorldDraw.DrawEntity(tmpObj);
                }
                // 这不使用newobj，需要显示调用RemoveAll函数清楚内存。
                // 不然这个可能就会程序退出时才释放，这时它会去释放控件对象指针，有可能会出错。
                newobj.RemoveAll();
            }
        }
    }