Duplicate the portion of a wave displayed in a graph

// Usage:  Right click on a trace and choose Partial duplicate -> Visible portion
// And the part of the wave that is currently within the x range of the graph
// window will be duplicated into a new wave.
Menu "TracePopup"
    SubMenu "Partial duplicate"
        "Visible portion", /Q, DuplicateVisiblePortion()
    End
End
 
Function DuplicateVisiblePortion()
    // Determine which trace the user selected.
    GetLastUserMenuInfo
    String graphName = S_graphName
    String traceName = S_traceName
    
    // Call function to get the range to duplicate.
    Variable xMinPnt, xMaxPnt
    GetXRangeOfTracesXAxis(graphName, traceName, xMinPnt, xMaxPnt)
    
    WAVE targetWave = TraceNameToWaveRef(graphName, traceName)
    
    // Duplicate the wave.
    WAVE/Z destWave
    String destWaveFullPath = DuplicateSpecifiedPortionOfWave(targetWave, xMinPnt, xMaxPnt)
    
    // Print a summary of what was done to the history window.
    printf  "Duplicated %s[%d,%d] into %s\r", GetWavesDataFolder(targetWave, 2), xMinPnt, xMaxPnt, destWaveFullPath
End
 
Function/S DuplicateSpecifiedPortionOfWave(targetWave, xMinPnt, xMaxPnt)
    WAVE targetWave
    Variable xMinPnt
    Variable xMaxPnt
    
    // Create a name for the destination wave.
    String destWaveName = GetWavesDataFolder(targetWave, 1) + PossiblyQuoteName(UniqueName(CleanupName(NameOfWave(targetWave) + "Copy", 1), 1, 0))
    
    Duplicate/R=[xMinPnt, xMaxPnt] targetWave, $(destWaveName)
    WAVE destWave = $(destWaveName)
 
    return GetWavesDataFolder(destWave, 2)      // Return the full path to the new wave.
End
 
Function GetXRangeOfTracesXAxis(graphName, traceName, xMinPnt, xMaxPnt)
    String graphName, traceName
    Variable &xMinPnt, &xMaxPnt     // Both passed by reference
 
    WAVE targetWave = TraceNameToWaveRef(graphName, traceName)
    
    // Determine X limits of trace that is visible in graph window.
    String info = TraceInfo(graphName, traceName, 0)
    String xAxis = StringByKey("XAXIS", info, ":", ";") 
 
    GetAxis/W=$(graphName)/Q $(xAxis)
    if (V_flag == 0)        // xAxis is actually used in the graph--this should always be true
        // Convert axis values into point values
        xMinPnt = x2pnt(targetWave, V_min)
        xMaxPnt = x2pnt(targetWave, V_max)
    endif
End