Equipment and curve drawing method

摘要

PURPOSE:To execute the plotting processing at a high speed. CONSTITUTION:In a control point position detecting means 6, the position for a display area of a control point for controlling a shape of a cubic B spline curve is detected, and thereaftrer, a curve area discriminating means 19 discriciminates whether the cubic B spline curve is outside of the display area or not, and in the case it is discriminated that the curve is outside of the display area, it is excluded from a subject of a curve processing executed by a curve processing means 22.