创建一个混合曲线创造轻基准线。

Create a blend curve to create the light base line.

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二次曲线的准线。

The directrix line of a conic.

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光标仅沿着曲线移动，十字准线显示指定的垂足和切线扩展到曲线的任意一点。

Crosshairs appear to indicate the perpendicular and tangent lines that extend from any point on the curve.

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从而给出了以平面上任意点为焦点、任意直线为准线，任意正数为离心率的圆锥曲线的直接作图方法。

Thus, we give a make-graph method of conic section on plane with arbitrary point as foci, arbitrary line as directrices and arbitrary positive number as eccentricity.

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从而给出了以平面上任意点为焦点、任意直线为准线，任意正数为离心率的圆锥曲线的直接作图方法。

Thus, we give a make-graph method of conic section on plane with arbitrary point as foci, arbitrary line as directrices and arbitrary positive number as eccentricity.

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