In the first grid image below, a rectangle from (2,1) to (5,5) is filled. The entire area between them (light red) falls on pixel boundaries, so the resulting filled rectangle will have crisp edges.

在第一个图中，填充了（2，1）至（5，5） 的矩形，整个区域的边界刚好落在像素边缘上，这样就可以得到的矩形有着清晰的边缘。

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In the first grid image below, a rectangle from (2,1) to (5,5) is filled. The entire area between them (light red) falls on pixel boundaries, so the resulting filled rectangle will have crisp edges.

在第一个图中，填充了（2，1）至（5，5） 的矩形，整个区域的边界刚好落在像素边缘上，这样就可以得到的矩形有着清晰的边缘。

youdao