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# EV script 010 - New EV file using template, add data, create lines

# Example Echoview COM script originally submitted to the Echoview forum by Jeremy Holden

# Downloaded from www.echoview.com

# For assistance, contact Echoview support <support@echoview.com>

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import win32com.client

import os



# Define some variables

template = 'e:/my_template.EV'

workdir = 'e:/test/'



# Write the function

def data_setup (filename):

    '''  (filename) -> str

    Applies a template, creates lines and saves the file as filename.EV



    >>> data_setup('my_filename')

    'my_filename.EV has been created'

    

    '''

    # Open EV connection

    EvApp = win32com.client.Dispatch("EchoviewCom.EvApplication")



    # Create a transect.EV file in workdir

    EvFile = EvApp.NewFile(template)

    

    # Add all dt4 files from within workdir

    ## Specify file extension

    extension = '.dt4'



    ## Get list of files to add

    myfiles = [file for file in os.listdir(workdir) if file.lower().endswith(extension)]

   

    ## Create loop to add all *.dt4 to EV file

    for file in myfiles:

        addfile ="".join([workdir,file])

        EvFile.Filesets.Item(0).Datafiles.Add(addfile)

        

    # Create Lines

    ## Surface

    EvLineSurface = EvFile.Lines.CreateFixedDepth(3.8)

    EvLineSurface.Name = 'SurfaceExclude'

    

    ## 100m line

    EvLine100m = EvFile.Lines.CreateFixedDepth(100)

    EvLine100m.Name = '100m'



    ## Bottom

    EvFile.Properties.LinePick.Algorithm = 2

    EvFile.Properties.LinePick.StartDepth = 5

    EvFile.Properties.LinePick.StopDepth = 200

    EvFile.Properties.LinePick.MinSv = -40

    EvFile.Properties.LinePick.UseBackstep = True

    EvFile.Properties.LinePick.DiscriminationLevel = -50.0

    EvFile.Properties.LinePick.BackstepRange = -0.50

    EvFile.Properties.LinePick.PeakThreshold = -50.0

    EvFile.Properties.LinePick.MaxDropouts = 2

    EvFile.Properties.LinePick.WindowRadius = 8

    EvFile.Properties.LinePick.MinPeakAsymmetry = -1.0

    myvar = EvFile.Variables.FindByName("Fileset1: Sv split beam pings (channel 1)")

    EvLineBottom = EvFile.Lines.CreateLinePick(myvar,True)

    EvLineBottom.Name = 'Bottom'

    

    # Save and close

    myname = "".join([workdir,filename,'.EV'])

    EvFile.SaveAs(myname)

    EvApp.Quit



    return "".join([filename,'.EV has been created'])



# End of Script