How to print signal tap graphics?

Unfortunately, there isn't a direct way to do this within the SignalTap window. What you can do as an alternative, is to save the captured data and export it out as either a Vector Waveform File (.vwf) or a graphic file (.jpg or a .bmp). (See http://www.altera.com/literature/hb/qts/qts_qii53009.pdf (http://www.altera.com/literature/hb/qts/qts_qii53009.pdf) - page 54). If you've saved it as a graphic, you can use a graphics editor to crop the region of interest and print to fit to page.

Alternatively, if you've saved it as a *.vwf, open the file with Quartus II. In the waveform editor, you can choose a specific zoom level clicking to View -> Zoom... -> Show range to scale to the samples of interest. From there, you can do a screen caputure of the waveform editor and crop out the waveform using a graphics editor.

Best,

FQ