Method of sizing an image on a graphic display for a numerical controller

Abstract

The present invention is to enable the locus of a tool or the like to be drawn on a display screen (25) based on an NC command program on an optimum scale and as quickly as possible. A microcomputer (10) obtains a magnification for image drawing and center coordinates of an image drawing space such that maximum and minimum coordinate values entered through a key input means (15) will be put in the display screen (25). Based upon such a magnification and center coordinates, the locus of a tool or the like is drawn on the display screen (25). In parallel with the above drawing process, the microcomputer (10) obtains maximum and minimum coordinate values of the NC command program. When a predetermined command is entered through the key input means (15) after completion of the above drawing process, the microcomputer (10) obtains such a magnification for image drawing and center coordinates of the image drawing space that the maximum and minimum coordinate values of the NC command program obtained in parallel with the above drawing process will be contained in the display screen (25). Based upon the thus obtained magnification and center coordinates, the locus of a tool or the like is drawn on the display screen (25). Accordingly, when the maximum and minimum coordinate values input from the key input means (15) are appropriate, a satisfactory image can be drawn by the first drawing process. Even if the image by the first drawing process is not satisfactory, the locus of a tool or the like can be drawn in its entirety on the display screen (25) through second drawing process.

Dependencies are inferred from the claim text.