This post is admittedly rather late but here it is anyway.
Cardio Grapher Cardio Grapher is out of beta and has been for some time. The current version is 2.1. Almost all of the work that led to this happened in the first quarter of the year – since then I’ve not found much time for it.
All known bugs (both discovered by myself and reported by users via Google Play) have been fixed, and I’ve added a couple of enhancements on top of what was in the beta:
- Calorie burn estimation based on (aside from the obvious – heart rate): age, sex and weight.
- This is calculated using formulae from http://www.braydenwm.com/calburn.htm.
- The results are obviously not as accurate as they could be. It could be improved if I added support for configuring VO2 max – and who knows, maybe I will in a future version – but my guess is that most users (myself included) do not know their VO2 max.
- Orientation preference (so you can fix it to landscape or portrait instead of allowing the phone to rotate it based on orientation). Field testing (cycling on the wonderful roads of Cambridgeshire) revealed that with my phone approximately flat, mounted on the bars, it would oscillate between portrait and landscape when cornering – not ideal. Fixing the orientation in Cardio Grapher prevents this, without having to override the setting globally for all applications on the system.
- Can show graphing frame rate. This in itself is not of real interest – the bit that is is that I’ve heavily modified the graphing library Snowdon, without which I probably would never have found time to create Cardio Grapher – to continually render to a SurfaceView rather than continually invalidating it externally – which is more appropriate going forward for a real time application such as Cardio Grapher.
That’s it! Not very much really. But it’s stable and has a decent amount of users (given how niche it is – you do after all need to own a Zephyr HxM for it to be of any interest) who seem to be happy. Specifically 419 active and 2,532 total installs, with an average user rating of 4.1/5 from 11 reviews. And, also importantly, it does what I built it to do.
This is what the main graph looks like now (it’s a subtle change). The text alignment/lack of padding looks bad in screenshots but on real devices it’s fine:
I still have a whole bunch of ideas/features I’d like to implement – the issue is finding time with which to do so. So the next release may be in 1 month or in 12+. Hopefully somewhere in between.