轮廓将是一组要连接的点.
按顺序阅读您的点列表，将它们绘制出来，将它们连接到下一个，将最后一个连接到第一个.

去尝试一下，然后问您什么时候被卡住.

A contour will be a set of points that are to be joined.
Read your list of points in order, plot them out joining each to the next, join the last to the first.

Go and try this, then ask when you get stuck.