Trying to create a signal for when intraday price crosses SMA or EMA

There seem to be plenty of examples of signals for crossovers between moving average functions but how would one go about creating a signal for when an intraday price crosses above or below a moving average? Or is there a function that even would use, for instance, the min price or max price of an equity within each day for comparison to, say, a 9 or 15 day SMA or EMA?

Start by reviewing the existing moving-average crossover signal examples and how quantstrat represents intraday prices. Clarify whether the intended change is a signal function or documentation, then define completion around detecting price crossings against 9- or 15-day SMA or EMA values using the requested intraday or daily extrema.

Written by the indexing model from the issue text.