MxDrawResbuf param = new MxDrawResbuf();
            MxDrawPoint pt1 = new MxDrawPoint();
            MxDrawPoint pt2 = new MxDrawPoint();

            // 设置打印对话框默认的，打印范围 ,10,10,   100,100
            pt1.x =  10;
            pt1.y =  10;

            pt2.x =  100;
            pt2.y =  100;
            param.AddPoint(pt1);
            param.AddPoint(pt2);

            axMxDrawX1.SendStringToExecuteEx("Plot", param);