Morning all!
I'm trying to get past two of my many programming hurdles and would
appreciate your help. Pointers to documentation are fine, my goal is to
learn, not just get the question answered.
I'm writing a small application to plan scuba dives. The planning takes
in lots of user input and checks it against safety margins, recommends
gas requirements based on time, etc.
There are two topics I'm working on and three issues within those
topics. First, I'm trying to build my Object skills so am using an
object and some methods. The other topics, and two issues are on forms.
I prefer to stay with straight PHP while I learn, before going to a
Forms tool or framework. So I'm thing to set things up so that a user
could do a quick query or a full dive profile using the same object and
methods.
Here are some use cases, hopefully they make sense.
You want to dive to 114 feet to see a certain wreck. What's the best
Nitrox mix for a 1.6 PPO2 at 114? What's the mix for 1.4 PPO2?
You just want to go dive and your tanks have 36% in them. What's the MOD?
You and a buddy want to go to 65 feet FFW and penetrate 500' into
Jackson Blue. What are your gas requirements individually and for
matching to meet the rule of thirds? What mixes can you use?
You expect to need 27 minutes on task at 130 feet to survey the first
part of the wreck. What mix can you use, how much deco gas will you
need, and where's your CNS clock at the end?
From a PHP perspective the math is pretty simple. What I am less
skilled at is designing the form flow and logic to retain inputs while
error checking and incrementally entering form data. For example, you
can't compute gas used without SAC, ATA, and Time.
A simple, non-functional view is at:
http://reuel.net/dive/demo_dive_planner.php
What I would like to have is a form that lets them compute parts of the
dive or all of it, depending on what option they pick and what data they
fill in. That is:
Fill in Depth and click "Compute ATA". Which is doable.
Fill in Depth, Time, and SAC and click "Gas Required". Which is doable.
If you forget one return the form with the data you already provided and
error mark the parts you forgot.
Make sense?
Leam
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