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通常所说直线参数方程指的是方程这是过定点P_0(x_0,y_0),倾角为α的直线的参数方程,t为参数,t的几何意义是直线上一动点P(x,y)到定点P_0(x_0,y_0)的有向距离。对于方程(Ⅰ)的应用本刊1985年第4期《谈直线的参数方程及其应用》一文较详尽的论述过。本文将介绍直线的另一种形式的参数方程。
Generally speaking, the linear parametric equation refers to the parametric equation which is an over-fixed point P_0 (x_0, y_0) and the inclination is α, and t is the parameter. The geometrical meaning of t is a point on the straight line P(x,y) to The directed distance of the fixed point P_0 (x_0, y_0). The application of equation (I) is described in detail in the article “Parametric Equations and Application of Straight Lines”, Issue 4 of 1985. This article will introduce another form of parametric equation for a straight line.