Operation instructing device, image forming apparatus including the same and operation instructing method

摘要

An operation instructing device includes a display unit that displays an image and a detecting unit that detects a touched position and thereby specifies a corresponding position of an image displayed on the display unit. While an image is displayed on the display unit, if the detecting unit detects that at least two points A and B are touched in a portion of the detecting unit corresponding to the image, assuming that the image is formed on a sheet of recording paper, a distance between two points of the image formed on the sheet of recording paper corresponding to the two touched points is calculated and displayed on a display panel. Thus, an error in operation instruction such as enlargement and reduction can be reduced, and hence, wasteful consumption of ink and recording paper can be reduced.

主权项

1. An operation instructing device, comprising:
a display unit that displays an image; and a detecting unit that detects a touched position and thereby specifies a corresponding position of the image displayed on said display unit; wherein while an image is displayed on said display unit, if said detecting unit detects at least two points touched in a partial area of said detecting unit corresponding to the image, assuming that the image is formed on recording paper, a distance between the two points of the image formed on said recording paper corresponding to said two touched points is calculated and displayed as a target distance on said display unit; a key for increasing/decreasing value of said target distance is displayed on said display unit when a touch is detected by said detecting unit; if an instruction to increase/decrease said value of said target distance, by a change in touched positions while the touch of said two points detected by said detecting unit is maintained, is detected by said detecting unit, said target distance is updated to the distance between said two points after the change in touched positions; if an instruction to said key to increase/decrease said value of said target distance is detected by said detecting unit, said target distance displayed on said display unit is updated by increasing/decreasing said target distance in accordance with said instruction to increase/decrease to said key; and a ratio of changed target distance to the target distance initially calculated by said detecting unit is determined to be a magnification when said image is formed on the recording paper.