Patent ID: 8817027
Filing Date: 2014-08-26
Classification: G06F

Abstract:
1. A graph display apparatus comprising: a display unit; a graph formula input unit for receiving input of a graph formula based on a user operation; a coordinate system setting unit for setting a display range of a coordinate system and a scale interval on a coordinate axis in the coordinate system based on the user operation; a coordinate system display controlling unit for making the display unit display the coordinate axis in the coordinate system in the display range set by the coordinate system setting unit and display scales and scale values at the scale interval set by the coordinate system setting unit on the coordinate axis, the coordinate system display controlling unit including a scale value display controlling unit for detecting overlapping of the scale values to be displayed on the coordinate axis, and, when the scale values overlap, making the display unit display only scale values of scales at both ends among the scales to be displayed on the coordinate axis; a graph display controlling unit for making the display unit display a graph of the graph formula in the set display range of the coordinate system; an image data storing unit in which at least one piece of image data is stored; an image data selecting unit for selecting any one piece of image data in the image data storing unit, as selected image data, based on the user operation; and an image data display controlling unit for making the display unit display an image of the selected image data as a background of the coordinate system, wherein additional data is added to the image data, the additional data showing the display range of the coordinate system to be displayed with the coordinate system overlaid on the image of the image data, and showing the scale interval on the coordinate axis, wherein the coordinate system setting unit sets the display range of the coordinate system and the scale interval on the coordinate axis, according to the additional data added to the selected image data, wherein the coordinate system setting unit includes a grid display setting unit for setting whether to display a grid line or grid point at positions corresponding to each position where the scales are displayed in the coordinate system, wherein the coordinate system display controlling unit makes the display unit hide the grid line or grid point when the grid display setting unit performs setting for hiding the grid line or grid point, and wherein the coordinate system display controlling unit makes the display unit display the grid line or grid point when the grid display setting unit performs setting for displaying the grid line or grid point and when, at the same time, an interval of the grid lines or grid points to be displayed at the positions corresponding to the positions where the scales are displayed is more than a predetermined value.