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Wind Direction Xbasic

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  • Wind Direction Xbasic

    Don't laugh at my code if you can easily see how it could be more efficiently written!
    I did my best.

    So here's the scenario. I am using an openweathermap.org API to pull in the weather data, specifically the wind direction and speed. The wind direction comes back from them as the degrees of a circle, so 360 is the same as zero which would be North (N) as well as the first 11.25 degrees, 180 would be due south, 45 degrees NE, and 90 degrees E. I wanted to use the appropriate abbreviation based on the degree so I did some research and I think I got it!
    It took me all evening as I have never used an array, and not real familiar with math functions.

    I took some javascript i found and figured out how to make it work in xbasic...
    Again, what this does is display the right abbreviation based on the returned json data in the api call to openweathermaps.org.
    I thought I might share...and if you do see a way to make it better let me know - it was my first stab at this!
    The variable "purl" is a concatenated field to include the required URL with the lat & lon fields and my appid as required by the API


    Code:
    function weathercall as c (e as p)
        'debug(1)
        dim weathercall as c
    dim myresponse as p
    dim purl as c
    purl = e._currentRowDataNew.concat_coordinates
    myresponse = http_get(purl)
    dim pp as p
    pp = json_parse(myresponse.body,.t.)
    e.control.wind_speed = pp.wind.speed
    e.control.deg = pp.wind.deg
    dim num as n
    dim val as n
    dim mydir as c
    dim mydir2 as c
    dim numoff as n
    num = pp.wind.deg
    numoff = (num - 11.25)/22.5
        val= round(numoff,0)
        mydir = abs(val)
    
    dim arr[16] as p
        arr[1].0="N"
        arr[1].1="NNE"
        arr[1].2="NE"
        arr[1].3="ENE"
        arr[1].4="E"
        arr[1].5="ESE"
        arr[1].6="SE" 
        arr[1].7="SSE"
        arr[1].8="S"
        arr[1].9="SSW"
        arr[1].10="SW"
        arr[1].11="WSW"
        arr[1].12="W"
        arr[1].13="WNW"
        arr[1].14="NW"
        arr[1].15="NNW"
    
    mydir2 = arr.dump_properties(mydir)
    e.control.wind_direction = mydir2
    end function
    Screenshot shows the test UXweather.JPG made to build it
    NWCOPRO: Nuisance Wildlife Control Software My Application: http://www.nwcopro.com "Without forgetting, we would have no memory at all...now what was I saying?"

  • #2
    Re: Wind Direction Xbasic

    Very nice result. Well done.
    Insanity: doing the same thing over and over again and expecting different results.
    Albert Einstein, (attributed)
    US (German-born) physicist (1879 - 1955)

    Comment


    • #3
      Re: Wind Direction Xbasic

      Hi Paul,

      Any time you get things working the way you want, you've done a good job.
      With that said, you could just dim arr as p. No need for the [16].
      Gregg
      https://paiza.io is a great site to test and share sql code

      Comment


      • #4
        Re: Wind Direction Xbasic

        dim arr[0..15] as c
        arr.initialize( comma_to_crlf("N,NNE,NE,ENE,E,ESE,SE,SSE,S,SSW,SW,WSW,W,WNW,NW,NNW"))

        Comment


        • #5
          Re: Wind Direction Xbasic

          Very cool .. nicely done Charles.
          Alpha Anywhere v12.4.6.4.0 Build 8000-5628 IIS v10.0 on Windows Server 2019 Std in Hyper-V

          Comment


          • #6
            I know it's always easier when someone else leads the way, but here's my little xbasic function.
            Then 2nd box of code works (tested) with a mysql select statement.

            Code:
            function dirtext as C (heading as N)
            dirtext = case( heading < 12,"N",heading < 34,"NNE",heading < 57,"NE",heading<79,"ENE",heading<102,"E",heading<124,"ESE",heading<147,"SE",heading<169,"SSE",heading<192,"S",heading<214,"SSW",heading<237,"SW",heading<237,"SW",heading<259,"WSW",heading<282,"W",heading<304,"WNW",heading<327,"NW",heading<349,"NNW",heading>=349,"N")
            end function'dirtext
            Code:
            (
            case
            when fl.heading = 0 then 'STOPPED' when fl.heading < 12 then 'N' when fl.heading < 34 then 'NNE'
            when fl.heading < 57 then 'NE' when fl.heading < 79 then 'ENE' when fl.heading < 102 then 'E'
            when fl.heading < 124 then 'ESE' when fl.heading < 147 then 'SE' when fl.heading < 169 then 'SSE'
            when fl.heading < 192 then 'S' when fl.heading < 214 then 'SSW' when fl.heading < 237 then 'SW'
            when fl.heading < 259 then 'WSW' when fl.heading < 282 then 'W' when fl.heading < 304 then 'WNW'
            when fl.heading < 327 then 'NW' when fl.heading < 349 then 'NNW' when fl.heading >=349 then 'N'
            end )
            Gregg
            https://paiza.io is a great site to test and share sql code

            Comment


            • #7
              Have not tested this, but if you are really interested in speed, then tyy
              dim dir_list as C = "N,NNE,NE,ENE,E, ..."
              dim degs as N = return value
              dir_num = int(degs/15)
              dir_display = word(dir_list,dir_num,",").
              Pat Bremkamp
              MindKicks Consulting

              Comment


              • #8
                I tested this and have some modifications First, since the direction is only for display, add another N on the end. of the list of directions. You don't need an array.
                dim dir_list as C = "N,NNE,NE,ENE,E,ESE,SE,SSE,S,SSW,SW,WSW,W,WNW,NW,NNW,N"

                then add your 11.25 degrees to the number of degrees returned to rotate the left side of north to the top of the circle
                dim degs as N = return value + 11.25

                since word is 1 based, add 1 to the dir num
                dir_num = 1 + int(degs/22.5)

                One of the Alpha guys told me that the word function is a very fast function unlike the case function that looks at every option,
                dir_display = word(dir_list,dir_num,",").




                Pat Bremkamp
                MindKicks Consulting

                Comment


                • #9
                  I wonder how much faster it is ?
                  In the example shown I use 355 to ensure it would have to check each possibility.
                  As a sidenote, the 22.5 comes from dividing 360 by 16.

                  Code:
                  function dirtext as P (heading as N)
                  dirtext.beg = now()
                  dirtext.begd = time("yyyy-MM-dd 0h:0m:0s.3",dirtext.beg)
                  ' debug(1)
                  dirtext.result = case( heading < 12,"N",heading < 34,"NNE",heading < 57,"NE",heading<79,"ENE",heading<102,"E",heading<124,"ESE",heading<147,"SE",heading<169,"SSE",heading<192,"S",heading<214,"SSW",heading<237,"SW",heading<237,"SW",heading<259,"WSW",heading<282,"W",heading<304,"WNW",heading<327,"NW",heading<349,"NNW",heading>=349,"N")
                  dirtext.fin = now()
                  dirtext.find = time("yyyy-MM-dd 0h:0m:0s.3",dirtext.fin)
                  dirtext.elapsed = dirtext.fin-dirtext.beg
                  end function'dirtext
                  
                  ?dirtext(355)
                  = beg = 04/30/2022 09:05:26 35 am
                  begd = "2022-04-30 09:05:26.354"
                  elapsed = 0
                  fin = 04/30/2022 09:05:26 35 am
                  find = "2022-04-30 09:05:26.354"
                  result = "N"
                  Gregg
                  https://paiza.io is a great site to test and share sql code

                  Comment


                  • #10
                    Thanks for that excellent demonstration. Yes, the difference is very small in this case (no pun intended) so it really doesn't matter which way you do it. Charles' question was can it be "more efficiently written" which I took to mean amount of code to write and speed of the calculation. I can see that I might have offended those who suggested the case statement, but that was not intended. I meant to show that the word function is a good technique that often doesn't come to mind in cases like these.
                    Pat Bremkamp
                    MindKicks Consulting

                    Comment


                    • #11
                      Pat,

                      I don't take offense at anything you say.
                      I chipped in with this because I just put it into play at the office.
                      Samsara sends the heading, but not the text display. I chose to let mySQL do the conversion.
                      Gregg
                      https://paiza.io is a great site to test and share sql code

                      Comment


                      • #12
                        over all its a great debate - It is always interesting to see the many different ways code can be written to achieve a desired result. Thanks!
                        NWCOPRO: Nuisance Wildlife Control Software My Application: http://www.nwcopro.com "Without forgetting, we would have no memory at all...now what was I saying?"

                        Comment

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