设计人员大都需要调用最基本的绘制命令来完成。

So, these basic drawing commands are used by designer to do.

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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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