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Method and apparatus for enlarging a trend graph
Method and apparatus for enlarging a trend graph
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机译：放大趋势图的方法和装置
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摘要
In an enlarged trend graph displaying method, a portion of an overall trend graph is enlarged so as to be displayed on a display screen subdivided into upper and lower reduced display sections and a middle enlarged display section. This enlarged trend graph displaying method comprises the steps of: calculating both a display area ratio of the middle enlarged display section to an overall display area of the screen for displaying the overall trend graph, and an enlargement ratio thereof, and also for calculating a reduction ratio of each of the upper and lower reduced display sections based upon the display area ratio and enlargement ratio of the middle enlarged display section; setting first data on the overall trend graph which has been enlarged by the enlargement ratio as a first virtual screen image indicative of the middle enlarged display section; setting second and third data on upper and lower portions of the overall trend graph which each has been reduced by the same reduction ratio as second and third virtual screen images representative of the upper and lower reduced display sections; scrolling a display position designating window for the first virtual screen image indicative of the middle enlarged display section, and simultaneously moving a viewport for the enlarged display section within the display screen in conjunction with the scrolling operation, whereby the overall trend graph is displayed on the display screen subdivided into the upper and lower reduced display sections and middle enlarged display section, and also the middle enlarged display section is moved within the display screen and displayed with having top priority with respect to displays for the upper and lower reduced display sections.
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