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Moon, Hwan Pyo; Kim, Soo Hyun; Kwon, Song-Hwa
Applied mathematics and computation, 08/2023, Letnik: 451Journal Article
•We propose the Gauss–Legendre polynomials.•We also propose the Gauss–Legendre curve as the barycentric combination of the control points with the weights given by the Gauss–Legendre polynomials.•We discuss the shape control of polynomial curves using the Gauss–Legendre curves and analyze basic properties of the Gauss–Legendre polynomials. The Gauss–Legendre (GL) polygon was recently introduced for the shape control of Pythagorean hodograph curves. In this paper, we consider the GL polygon of general polynomial curves. The GL polygon with n+1 control points determines a polynomial curve of degree n as a barycentric combination of the control points. We identify the weight functions of this barycentric combination and define the GL polynomials, which form a basis of the polynomial space like the Bernstein polynomial basis. We investigate various properties of the GL polynomials such as the partition of unity property, symmetry, endpoint interpolation, and the critical values in comparison with the Bernstein polynomials. We also present the definite integral and higher derivatives of the GL polynomials. We then discuss the shape control of polynomial curves using the GL polygon. We claim that the design process of high degree polynomial curves using the GL polygon is much easier and more predictable than if the curve is given in the Bernstein–Bézier form. This is supported by some neat illustrative examples.
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