Create a graph of a column with gaps between data - excel

Question

I'm trying to create graphs of every column of data in a worksheet. As of right now it works as long as there are no gaps in the column of data, but I need it to be robust enough that it works if there are gaps in the data. The data is entered in batches with different columns having different lengths due to different measurement requirements. Each of the rows will also have an identifier in the first column indicating what batch of data that row comes from (see attached file). Since the identifier column will be the same length as the longest data column, I compare the last row of that to the bottom row of any given data column to make sure all the data is getting graphed. However right now the it gets stuck in the loop if there's a gap in the data.
Sub GraphAllColumns()
Dim col As Range 'The cell at the top of the data column
Dim bottomRow As Range
Dim bottomData As Range
Set col = ActiveSheet.Range("B7")
Set bottomRow = Range("A7").End(xlDown)
col.Select
If Not IsEmpty(Selection) Then 'If the worksheet is empty, nothing happens
Do
Set bottomData = Selection.End(xlDown)
If bottomRow.Row <= bottomData.Row Then
'Iterate through every column, select all the data in that column
'then call the create graph subroutine
Call CreateGraph
ActiveCell.Offset(0, 1).Select
Else
If IsEmpty(Selection.End(xlDown)) Then
Call CreateGraph
ActiveCell.Offset(0, 1).Select
Else
Range(Selection, Selection.End(xlDown)).Select
End If
End If
Loop Until IsEmpty(Selection)
End If
End Sub
Here's the CreateGraph subroutine as well. I'm happy the way that it works. I know it isn't the best way, but this is my first time using VBA.
Sub CreateGraph()
Dim startCell As Range 'Starting cell (important for column selection)
Dim graphRange As Range
Set startCell = Selection
Set graphRange = Range(startCell, startCell.End(xlDown)) 'Selects all data in column
'Create chart, define chart type and source data
ActiveSheet.Shapes.AddChart.Select
ActiveChart.ChartType = xlLine
ActiveChart.SetSourceData Source:=graphRange
'Change chart location so that all charts on a sheet are stacked in top left corner
With ActiveChart.Parent
.Top = Range("A1")
.Left = Range("A1")
End With
'Change chart title and other attributes
With ActiveChart
.HasTitle = True
.ChartTitle.Text = startCell.Offset(-2, 0).Value
End With
End Sub

Answer 1

I may still be misunderstanding what you want, but this should get you started.
Sub PlotDataById()
Dim dict As Object, id, ws As Worksheet, rngId As Range
Set ws = ActiveSheet 'or whatever
Set dict = IdRanges(ws.Range("B3")) 'get the ranges for each id
For Each id In dict
Set rngId = dict(id).Offset(0, 1) 'first set of data
Debug.Print "Plotting id - " & id & ":" & rngId.Address
Do While Application.CountA(rngId) > 0
'use resize() to pass only the occupied range
CreateGraph rngId.Resize(Application.CountA(rngId)), id
Set rngId = rngId.Offset(0, 1) 'next column over
Loop
Next id
End Sub
'Capture the ranges occupied by each id in a list, starting at `startCell`
' Assumes list is sorted by id
Function IdRanges(startCell As Range) As Object
Dim c As Range, id, currId, cStart As Range, dict As Object
Set dict = CreateObject("scripting.dictionary")
currId = Chr(0) 'some non-value
Set c = startCell
Do While Len(c.Value) > 0
id = c.Value
If id <> currId Then
If Not cStart Is Nothing Then
dict.Add currId, c.Parent.Range(cStart, c.Offset(-1, 0))
End If
Set cStart = c
currId = id
End If
Set c = c.Offset(1, 0)
Loop
dict.Add currId, c.Parent.Range(cStart, c.Offset(-1, 0))
Set IdRanges = dict
End Function
'Create a plot of `rngData` with title `chtTitle`
Sub CreateGraph(rngData As Range, chtTitle)
Dim co As Shape, cht As Chart, ws As Worksheet
Set ws = rngData.Parent
Set co = ws.Shapes.AddChart
With co.Chart
.ChartType = xlLine
.SetSourceData Source:=rngData
.HasTitle = True
.ChartTitle.Text = chtTitle
End With
With co 'all charts on a sheet are stacked in top left corner
.Top = ws.Range("A1").Top
.Left = ws.Range("A1").Left
End With
End Sub
Using Select/ActiveCell is not a very robust way to structure your code, and typically you can avoid almost all uses of that approach.