How to visualize sound?

When music is playing how can i draw 开发者_如何学编程a wave?

This should help you out:

http://www.codeproject.com/KB/audio-video/SoundViewer.aspx

Here's a demo project that will allow you to visualize sound waves in C#:

http://www.codeproject.com/KB/audio-video/SoundViewer.aspx

You can draw a graph and over time vary its height based on pitch, on volume, or just about any combination you may wish. A standard is to vary the period based on frquency of the sound and height on amplitude.