方 程 x = 20 * cos ( t * 360 * 5 ) y = 20 * sin ( t * 360 * 5 ) 曲线形状 笛卡尔坐标系 z = 25 * t r = 20 * t 圆柱坐标系 theta = 60 + t * 360 *5 z=0 s = 20 * t angle = 60 + t * 360 *5 x = s * cos (angle) 笛卡尔坐标系 y = s * sin (angle) z = 0 /* 与前一个方程等价 r = 20 * t 圆柱坐标系 theta = 60 + t * 360 *5 z= 50 * t rho = 6 球坐标系 theta = t * 180 phi = t * 360 * 10 theta = t *360 圆柱坐标系 r = 30 + 10* sin(theta*20) z = 10* cos(theta*20) r = 20 /* r表示基圆半径 alpha = t * 45 /* alpha表示压力角 笛卡尔坐标系 x = r * cos (alpha) + r * sin (alpha)* alpha* pi/180 y = r * sin (alpha) - r * cos (alpha )* alpha* pi/180 z = 0 /* 圆柱齿轮渐开线方程