Graphical User Interface Manipulation Method
An input apparatus includes an input unit via which a user can point specific coordinates on a screen, and a display unit for displaying a graphical user interface (GUI). A menu for selecting an arbitrary item from a plurality of items is displayed on the GUI. When the user conducts manipulation to move a location of coordinates pointed by the user on the screen so as to draw a circle, center coordinates of a circle locus of the manipulation are presumed regardless of the location of the coordinates. An item selected in the menu is moved so as to be associated with a rotation angle of the manipulation with respect to the center coordinates. The user can conduct selection manipulation of consecutive menu items without depending upon the location of coordinates pointed by the user on the screen.
1 . A manipulation method performed by a computer comprising the steps of:
inputting specific coordinates on a screen pointed by a user using an input device;
displaying a graphical user interface on a screen of a display device;
displaying selection item having a form which allows the user to select an arbitrary item from among a plurality of items on the graphical user interface; and
determining center coordinates of a circle locus of the manipulation, when the user conducts a manipulation to move a location of coordinates pointed by the user on the screen so as to draw a circle, and rotating the selection item so as to be associated with a rotation angle of the manipulation with respect to the center coordinates.
2 . The manipulation method according to claim 1 , wherein when determining the center coordinates of the circle locus, an average location of coordinates pointed by the user on the screen over a definite time period is regarded as the center coordinates.
3 . The manipulation method according to claim 2 , wherein when determining the center coordinates of the circle locus, the center coordinates are disposed in a place which is a predetermined distance from the average location of coordinates pointed by the user on the screen over a definite time period, provided that coordinates pointed by the user on the screen are located at the same coordinates over a definite time period.
4 . The manipulation method according to claim 1 , wherein when determining the center coordinates of the circle locus, coordinates pointed by the user on the screen are acquired at intervals of a definite time period and a center of a circle which passes through coordinates of three latest points is regarded as the center coordinates.
5 . The manipulation method according to claim 1 , wherein if the center of the circle which passes through the coordinates of the three latest points is at least a definite distance from the previously calculated location of the center coordinates, then the center coordinates are not replaced by coordinates of the center of the circle which passes through the coordinates of the three latest points.