ELECTRONIC FUNCTION GRAPH DISPLAY DEVICE, COORDINATE ACQUISITION DEVICE, ELECTRONIC FUNCTION GRAPH DISPLAY METHOD, COORDINATE ACQUISITION METHOD, AND PROGRAM

摘要

Disclosed is an electronic function graph display device that obtains coordinates corresponding to points on a displayed graph. The device is provided with: coordinate system image data, the coordinate system of which has an x-axis and a y-axis; and image data storage unit (11) in which graph image data of a function y = f(x) are stored; a position specification receiving unit (12) that receives the specification of a position on the coordinate system; a numerical value acquisition unit (13) that acquires an x-axis numerical value "a" that corresponds to the received position; a computation unit (14) that uses "a" to compute a y-axis numerical value "f(a)"; an image generation unit (15) that generates x-axis numerical value image data, y-axis numerical value image data and point diagram image data which represent positions on the coordinate system corresponding to x-axis numerical values and y-axis numerical values; and an image display unit (16) that displays the stored image data and the generated image data. The position specification receiving unit (12) receives via a GUI specifications of positions on the coordinate system of the coordinate system image data displayed by the image display unit (16).