在第10行中定义白色对于确保各个绘制命令按预期完成是十分重要的。

File. Defining the color white on line 10 is important to ensure that the various drawing commands complete as expected.

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对于本示例，只有dots文件中的第一组坐标对将用于构建各种绘制命令。

For this example, only the first coordinate pair from the dots file is used to build the various drawing commands.

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注意，我们使用了两个命令替代来为绘制操作生成单独的线条规范。

Notice that we use two command substitutions to generate the individual line specifications for the draw operation.

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