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Method and apparatus for enlarging a trend graph

  • US 5,261,031 A
  • Filed: 04/09/1990
  • Issued: 11/09/1993
  • Est. Priority Date: 04/10/1989
  • Status: Expired due to Fees
First Claim
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1. A method for enlarging a portion of an overall trend graph to be displayed on a display screen, said display screen being subdivided into upper and lower reduced display sections and a middle enlarged display section, said middle enlarged display section displaying an enlarged portion of said overall trend graph, said method comprising the steps of:

  • calculating a reduction ratio of said upper and lower reduced display sections using a display area ratio of said middle enlarged display section to an overall display area of said display screen for displaying said overall trend graph and an enlargement ratio of said middle enlarged display section;

    setting, as a first virtual screen image, a first data representative of said overall trend graph which has been enlarged by said enlargement ratio;

    setting second and third data representative of upper and lower portions of said overall trend graph, each of which has been reduced by said calculated reduction ratio, as second and third virtual screen images representative of said upper and lower reduced display sections;

    scrolling a display-position designating window within said first virtual screen image, said designating window indicating said enlarged portion, and simultaneously moving said middle enlarged display section within said display screen in conjunction with said scrolling; and

    displaying said overall trend graph on said display screen subdivided into said upper and lower reduced display sections and said middle enlarged display section, wherein said middle enlarged display section is displayed in priority over displays for said upper and lower reduced display sections such that said enlarged portion of said trend graph is visible in said middle enlarged display section of said display screen.

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