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  1. Help-Desk
  2. HELP-4449

FIWARE.Request.Tech.Data.CEP.Function Distance

        Details

        • Type: extRequest
        • Status: Closed
        • Priority: Major
        • Resolution: Done
        • Fix Version/s: 2021
        • Component/s: FIWARE-TECH-HELP
        • Labels:
          None

          Description

          Thomas Cristanis sent a message using the contact form at
          http://catalogue.fiware.org/.

          Hi Dear,

          I wanted to know more details not provided by documentation relative the
          function distance. If you can use directly in the field condition of my
          Event?
          What kind of value returned? (meters, kilometers)?

          _______________________________________________
          Fiware-tech-help mailing list
          Fiware-tech-help@lists.fiware.org
          https://lists.fiware.org/listinfo/fiware-tech-help-new

          [Created via e-mail received from: thomascristanis@gmail.com]

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            TALI Fabiana Fournier added a comment -

            Dear Thomas,

            Distance:
            You need to provide 4 parameters, 2 for the first point and 2 for the second. These parameters are used as the (X,Y) coordinates of the 2 points you want to measure the distance between.
            The function calculate a geometric distance, sqrt((y2-y1)^2 + (x2-x1)^2), so the result will be in the same units as the input.
            To refer to attribute of an event use the following: <EventName>.<EventAttributeName> for example attribute x of event a: a.x
            So if event a has attributes x,y and event b has attributes x,y , you can refer to the distance between those two points by writing:
            distance(a.x,a.y,b.x,b.y)

            You can use this function directly in the condition of an input event assuming this event has the attributes of the two points.

            Best regards,
            Itai

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            TALI Fabiana Fournier added a comment - Dear Thomas, Distance: You need to provide 4 parameters, 2 for the first point and 2 for the second. These parameters are used as the (X,Y) coordinates of the 2 points you want to measure the distance between. The function calculate a geometric distance, sqrt((y2-y1)^2 + (x2-x1)^2), so the result will be in the same units as the input. To refer to attribute of an event use the following: <EventName>.<EventAttributeName> for example attribute x of event a: a.x So if event a has attributes x,y and event b has attributes x,y , you can refer to the distance between those two points by writing: distance(a.x,a.y,b.x,b.y) You can use this function directly in the condition of an input event assuming this event has the attributes of the two points. Best regards, Itai

              People

              • Assignee:
                TALI Fabiana Fournier
                Reporter:
                fw.ext.user FW External User
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                • Created:
                  Updated:
                  Resolved: