function  MxCADDrawLineWorldDraw(pt1)
 {
    var _pt1 = pt1;
    this.worldDraw = function(currentPoint)
    {
        this.drawLine(currentPoint,_pt1);
    }
    
    this.setPoint1 = function(pt)
    {
        _pt1 = pt;
    }
};


mxModule.regist(()=>{
    MxFun.addCommand("Mx_Line",()=>{
        var getPoint = new MrxDbgUiPrPoint();
        getPoint.setMessage("\n指定第一点:");
        getPoint.go((status)=>{
            if(status != 0)
            {
                return;
            }

            MxCADDrawLineWorldDraw.prototype = new McEdGetPointWorldDraw();
            var pt1 = getPoint.value();
            var worldDrawComment = new MxCADDrawLineWorldDraw(pt1);
            getPoint.setUserDraw(worldDrawComment);
            getPoint.setMessage("\n指定下一点:");

            var iCount = 0;
            var lastPt = pt1;
            getPoint.goWhile((status)=>{
                if(status == 0)
                {
                    var pt2 = getPoint.value();
                    var param =  
                    {
                        x1:lastPt.x,
                        y1:lastPt.y,
                        x2:pt2.x,
                        y2:pt2.y,
                    };

                    //getPoint.drawReserve();

                    MxFun.call('mxcad_drawLine', param, function (ret) {
                    //console.log(ret);
                    });
                    lastPt = pt2;
                    worldDrawComment.setPoint1(pt2);
                    iCount++;

                    if(iCount >= 2 )
                    {
                        getPoint.setMessage("\n指定下一点:");
                        getPoint.setKeyWords("[闭合(C)/放弃(U)]");
                    }
                    else if(iCount > 0)
                    {
                        getPoint.setMessage("\n指定下一点:");
                        getPoint.setKeyWords("[放弃(U)]");
                    }
                    else
                    {
                        getPoint.setMessage("\n指定第一点:");
                        getPoint.setKeyWords("");
                    }
                }
                else if(status == 1)
                {
                    // 输入关键字.
                    if(getPoint.isKeyWordPicked("C") )
                    {
                        // 闭合
                        var param =  
                        {
                            x1:pt1.x,
                            y1:pt1.y,
                            x2:lastPt.x,
                            y2:lastPt.y,
                        };
    
                        MxFun.call('mxcad_drawLine', param, function (ret) {
                        //console.log(ret);
                        });

                        return {exit:true};
                    }
                    else if(getPoint.isKeyWordPicked("U") )
                    {
                        // 回退
                        console.log("mxcad_drawLine undo....");
                    }
                }
                
            });


        });

    });

})