I have a question about the barHeight when render the wave?

[Idletalk]

The code is here https://github.com/katspaugh/wavesurfer.js/blob/main/src/renderer.ts#L287.
I'm curious why the barHeight isn't the sum of the minimum and maximum values of topChannel[0], but the sum of the maximum value of Math.abs(topChannel[i]) and Math.abs(bottomChannel[i])

[katspaugh]

Because the top half of the waveform is the left channel and the bottom part is the right channel. It takes the maximum value per sample for both.

[Idletalk]

Thank you for your answer, I am new to this direction. Is there any theory behind this statement about “the top half of the waveform is the left channel and the bottom part is the right channel” or What articles can I know

[katspaugh]

User name checks out...
Feel free to read this article: https://best-actress-dd7.notion.site/What-is-a-waveform-2643c77db21d4fa8bf11fbd3f29667db

[Idletalk]

I read this article, but it didn't answer my questions. My puzzle is why the bottom part of the waveform diagram needs to be represented by the data of the right channel instead of the minimum negative value of the left channel

[katspaugh]

Because most audio files, especially music tracks, are in stereo, and you hear the two channels separately, not as a sum of their volumes.

[Idletalk]

Got it. Thank you