ball-pointpen
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By means of the dual of Said-Ball basis, the Marsden identity is got in terms of Said-Ball basis, and a degree reduction algorithm for Said-Ball curves is presented through the transform from Bezier curves to Said-Ball curves.
利用Said-Ball基函数的对偶基，得到幂基函数在Said-Ball基下的Marsden恒等式，及从Bézier曲线到Said-Ball曲线的转换。并给出Said-Ball曲线的降阶赋值算法。
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In order to realize the transition from quartic Wang-Ball to Said-Ball curve, and the transition from quartic Said-Ball to B6zier curve, two new classes of curves with shape parameters are defined.
为了实现从四次Wang-Ball到Said-Ball曲线的过渡，以及从四次Said-Ball到B6zier曲线的过渡，定义了2种带形状参数的曲线。
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The first class of curve contains the quartic Wang-Ball and Said-Ball curve and many curves locating between them. The second class of curve contains the quartic Said-Ball and Bézier curve and many curves locating between them. By analyzing the relation between the new curves and the quartic B6zier curve, the geometric meaning of the shape parameters is obtained, and the geometrical drawing method of the new curves is given.
第一种曲线包含了四次Wang-Ball和Said-Ball曲线以及介于它们之间的无数曲线；第二种曲线包含了四次Said-Ball和Bézier曲线以及介于它们之闻的无数曲线；通过分析新曲线与四次Bézier曲线之问的关系，得出了形状参数的几何意义，并给出了它们的几何作图法。
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ball-pointpen：圆珠笔
ball-peenhammer圆头锤 | ball-pointpen圆珠笔 | Ballade叙事曲牌汽车