[Guidolib-devel] Using Guido for follow-along realtime playback

[Steve M. <st...@ko...>]

I've developed a simple application that uses ARFactory to generate and typeset a score.  I'm interested in adding realtime playback functionality to this application --- so that the user can press the "play" button, causing the notes currently being played to be highlighted, and a cursor line to move across the system --- similar to the attached screenshot of Cakewalk's Score View.

Do you have any suggestions as to how I should approach this?

In other words...  Assuming I'm able to determine which AR/GRNotes are currently active, how should I go about:
	1. changing the color of those notes temporarily
	2. determining the bounding box of the affected notes (so I can rerender just that part of the display)
	3. determining the bounding box of the current measure in the system (so I can linearly-interpolate and draw the cursor)
?

Thanks,
Steve