graphics 参数是代表绘图表面的对象。

The graphics argument is the object that represents the drawing surface.

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图像组件复制到可绘图表面之前，其位置已有记录，能够保证绘制顺序正确。

Before the image components are copied to the drawable surface, their locations are recorded to ensure that they are drawn in the correct order.

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实际上一旦确定了精确的像素值，就可以很容易地在绘图表面上呈现像素。

Actually rendering the pixels to the drawable surface is simple once the precise pixel values have been determined.

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