| 摘要 |
PURPOSE:To facilitate preparatory operation for data by generating a B spline curve of (n)th order passing an initial and a final control points with data as many as required to generate a tertiary B spline curve passing neither the initial nor final control point as to the control point data processor, which processes control point data so that the tertiary B spline curve can be displayed. CONSTITUTION:When the initial and final control point data on the tertiary B spline curve are inputted to a control point data input means 6, those initial and final control point data are stored in a control point data storage means 7 and supplied three times successively from the control point data control means 7 to a tertiary B spline curve generating means 9 through a selecting means, but in other cases, control point data inputted to the control point data input means 6 are supplied successively to an (n)th-order B spline curve generating means 9 through the selecting means 8. |
