Graph display apparatus, recording medium on which program is recorded, and graph display method

A graph display apparatus comprising:

• a display range storage unit which stores a display range including an upper-limit value and a lower-limit value in a horizontal axis direction and a vertical axis direction of a graph;
• an image file specifying unit which specifies image data of an image file as a background, wherein the image data of the image file includes a specified image of a reference point, and the image file includes additional data including a display range, the display range being set so that when an image of the image data is displayed superposed on a coordinate axis, the specified image of the reference point matches with an origin of the coordinate axis;
• a display range setting unit which sets the display range of the additional data of the image file in the display range storage unit;
• and
• a graph display control unit which displays a graph so that the specified image of the reference point is matched with the origin of the coordinate axis of the set display range.

A non-transitory computer-readable storage medium storing a computer-executable control program which controls a computer in a graph display apparatus, which comprises a display range storage unit which stores a display range including an upper-limit value and a lower-limit value in a horizontal axis direction and a vertical axis direction of a graph, to perform functions comprising:

• an image file specifying function which specifies image data of an image file as a background, wherein the image data of the image file includes a reference line of a horizontal position, and the image file includes additional data including a display range, the display range being set so that when an image of the image data is displayed superposed on a coordinate axis, the reference line matches with the coordinate axis in the horizontal axis direction;
• a display range setting function which sets the display range of the additional data of the image file in the display range storage unit;
• and
• a graph display control function which displays a graph so that the reference line is matched with the coordinate axis in the horizontal axis direction of the set display range.

A non-transitory computer-readable storage medium storing a computer-executable control program which controls a computer in a graph display apparatus, which comprises a display range storage unit which stores a display range including an upper-limit value and a lower-limit value in a horizontal axis direction and a vertical axis direction of a graph, to perform functions comprising:

• an image file specifying function which specifies image data of an image file as a background, wherein the image data of the image file includes a specified image of a reference point, and the image file includes additional data including a display range, the display range being set so that when an image of the image data is displayed superposed on a coordinate axis, the specified image of the reference point matches with an origin of the coordinate axis;
• a display range setting function which sets the display range of the additional data of the image file in the display range storage unit;
• and
• a graph display control function which displays a graph so that the specified image of the reference point is matched with the origin of the coordinates axis of the set display range.