... Line-Output Functions：画线操作 Simple Drawing Functions：简单绘图操作，如：绘制矩形框 Text Functions：文字输出操作 ...
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在用cairo进行绘图时，最简单的操作就像手工绘画时一样：选择绘图介质，选择画笔，选择颜色，考虑线条的布局，然后进行实际绘制。
When drawing with Cairo, the simplest operations are akin to choosing your medium, selecting a brush, choosing a color, thinking about the line placement, then actually drawing the lines.
实际上，简单的线条笔画只是cairo中的5种基本绘图操作之一。
In fact, simple line stroking is only one of the 5 essential drawing operations in Cairo. The 5 operations are.
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