二次曲面的正轴测投影解析式

Analytical equations of normal axonometric projection of quadratic surfaces

从二次曲面素线族的解析式入手，作出曲线族的包络线．用解析方法建立了二次曲面轴测投影外形线和曲面素线的曲线方程，并由计算机绘出图形．所得解析式适用于任意方向的正轴测投影．

This paper starts from the analytical equations of generator of quadrics,works outthe envelope line of family of curves,and sets up the curve equations of conicoid visible line innormal axonometric projection and generators of quadrics by analytic method,and also draws outthe figures by computer.These analytical equations are applicable to all orthographic axonometricprojection in any direction.