[linux-audio-dev] Algorithm for displaying waveforms

For a small application I am developing, I need to display waveforms (read-only) from audio data loaded into my application using libsndfile. My question is about displaying a waveform in a GUI window -- I have searched around the net looking for general algorithms but haven't seen anything that describes this. I haven't tried coding this yet, so I am asking if someone can describe the basic algorithm or point me in the right direction to a book, web site, the source file in Ardour or whatever. Even just a high-level description of the basic algorithm would be good -- I am thinking somewhere along the lines that I am taking the values of samples and drawing line segments from point to point. Thanks in advance! -- Brett