| 摘要 |
PROBLEM TO BE SOLVED: To make it possible to generate vertex coordinates values for representing graphics such as n-th order Bezir curve and Bezier curved surface with hardware. SOLUTION: When four control points are given in u and v directions in a grid shape and the vertex coordinates values for representing an n-th order cured surface are generated from the grid-like control points, this graphic information generating device is provided with a linear interpolator 1 which sequentially operates A×(1-t)+B×t about the coordinates values of a new control point that internally divides a line between control points on the basis of the coordinates values A and B of the control points of prescribed bit width and an interpolation coefficient t having 0<=t<=1 with the prescribed bit width. For instance, the coordinates values of a vertex P0 of a 3rd order curved surface graphic is calculated by respectively and sequentially operating A×(1-t)+B×t about a part between two respective control points adjoining in the u and v directions to calculate the coordinates values of 3×4 pieces, 2×4 pieces and 2×3 pieces of new control points and finally calculating the coordinates values of 2×2 pieces of new control points.
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