I'm also curious if the spam orders on both sides simply cancel out, what does the chart look like if you just multiply without discounting?
I mean you prefer to have both pair series or only one pair?
Nevermind that request, I made a chart for the data and "fake" orders do indeed have a large impact.
also as each filtering method will produce differernt series would it be practical to maintain all of them (thus multiplying serires) and toggle between them or just one. If one which one would be the most practical for analyzes on your opinion?
I think picking one is fine, which one to use depends on the purpose of the chart. The exponential function (a=0.1) prioritizes orders that are very close to the current price and hence should be a better indicator for short term market movement. The bandpass function (a=0.15) is closer to the "true" total volume but is more sensitive to volume changes that are very far away from the current price. The linear function is midway between the two but I'm not sure if it can match the benefit of either. I would run all three for a while and see what they look like, and then analyze the strength and weakness of each.
More UI suggestions: 1) Make the height of the chart area scale with window size, if you've got chart height scaling working it would be really nice to hide a few of the charts and have the rest be taller. 2) Move the axis labels to the right side of the charts, that's where new data is coming in so that's where people will be looking. 3) Add an option for a dark colour scheme, I think most people prefer something like
http://bitcoinity.org/markets or
http://bitcoin.clarkmoody.com/. 4) On the VWAP line there are markers for each point, but not on the other price lines. I think it looks better without markers.