Step 4: Discover the algorithm by which we use the formula to judge.
第四步：发掘出使用公式进行判断的算法。
Adding kerning to the basic text rendering algorithm is easy: When a kerning pair is found, simply add the scaled kerning distance to the pen position before step 4.
在基本文本渲染算法上增加字距调整非常简单，当一个字距调整对发现了，简单地在第4步前，将缩放后的调整距离增加到笔位置即可。
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