Industry controlled configuration software has become the mainstream of computer supervisory control system at present and its visualization embodies the quality of software. For further enhancing the visualization of the configuration software

the paper puts forward "online display of the vernier" scheme. The vernier

a rod capable of sliding freely on the curve graph

is designed in a bid to realize data's dynamic online display

thus replacing the monotonous data tables

Lets this special control element to act as the verniers rod that moves about

and make its the length automatically adjustment on the basis of the graph control element of length (width of this special control element has only one or two pixels). This kind of online display method is direct

convenient and easy to be operated with regard to data inquiry and trend analysis. Therefore

the vernier is a reasonable

applicable and original design. "The button overlapping technology" adopted in the course of designing has produced favorable results. The method aims to solve the problem of verniers' display of various length by overlapping a special control element with a graphic one transparently. Besides

the design of size handle and the principle of dynamic data exchanges are also discussed in the paper with suggested methods on their realization.