Zooming control

  There are three different ways of zooming into a portion of the signal. These are:

• Selecting a portion of the full signal plot. This will cause the signal window to zoom into the desired portion of the signal (to the nearest power of 2).
• Selecting a portion of the windowed signal plot, which has the same effect as the previous method
• Selecting a width from the widths list. This selects a window of the desired width, approximatively centered at the same point as the previous selection (unless that would cause the window to overstep the original signal, in which case it is translated to fit)

To zoom out, simply select a larger window in the full signal plot.

As you zoom, the widths list is updated to reflect the current window width.