第一项任务(也是最重要的任务)是计算图形的比例因子，就是说在绘图时每单位的值在高度上要占用多少像素。

The first (and most important) task is to calculate the scaling factor for the graph. This is simply how many pixels in height each value will be worth when it is plotted.

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第一项任务（也是最重要的任务）是计算图形的 比例因子，就是说在绘图时每单位的值在高度上要占用多少像素。

The first (and most important) task is to calculate the scaling factor for the graph. This is simply how many pixels in height each value will be worth when it is plotted.

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绘图员用铅笔、丁字尺、三角板和比例尺在绘图板上绘图。

Draughtsmen make drawing on a drawing board using a pencil and at-square set square and scale.

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