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想画一个线段,共分 4 个步骤三个点,前面两个点定位,第三个点作为延长线。绘制第三个点时要将点的纵坐标调整到延长线上,这要涉及斜率。直接使用 timestamp 和 value 计算会有偏差,要调整成 x、y 值计算才能保证准确。
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