Passing a dynamic range to charts - excel

Question

I want to check the status of a sheet and when changed automatically run some calculations. I also wish refresh a graph with the new data from that sheet.
I used the Worksheet_Change function. It calls the sub with the calculations and calls the sub that contains the chart modification code. They run as planned with one exception. The range that gets passed to the Chrt1 sub (responsible for the chart functionality) does not get updated on the graph once it has been called out for the first time.
I'm aware that this can be overcome with Excel built-in tables function but I'd like to code this simple routine in anyways.
The Worksheet_Change function:
Sub Worksheet_Change(ByVal Target As Range)
Application.EnableEvents = False
AutoChangeTest
Application.EnableEvents = True
End Sub
The main module code:
Sub AutoChangeTest()
Dim s1 As Worksheet, s2 As Worksheet
Dim i As Integer, j As Integer, lrow As Integer, lrow2 As Integer
Set s1 = Sheets("Arkusz3")
On Error GoTo Err1
lrow = s1.Cells(s1.Rows.Count, 1).End(xlUp).Row
For i = 1 To lrow
s1.Cells(i, 2) = s1.Cells(i, 1) * 2
Next
Call Chrt1(Range(s1.Cells(1, 1), s1.Cells(lrow, 2)), s1)
Err1:
If Not IsNumeric(s1.Cells(i, 1)) Then
s1.Cells(i, 1).Activate
End If
End Sub
Sub Chrt1(r1 As Range, s1 As Worksheet)
Dim c1 As Shape
Dim s As Worksheet
Dim cht As ChartObject
Dim i As Integer
i = 0
Set r = r1
Set s = s1
For Each cht In s.ChartObjects
i = i + 1
Next
If i = 0 Then
Set c1 = s.Shapes.AddChart
End If
c1.Chart.SetSourceData (r)
End Sub

Answer 1

Some suggestions in the code below:
Sub AutoChangeTest()
Dim ws As Worksheet 'avoid variable names with 1/l - too unclear
Dim i As Long, lrow As Long 'always use long over integer
Set ws = ThisWorkbook.Worksheets("Arkusz3")
lrow = ws.Cells(ws.Rows.Count, 1).End(xlUp).row
On Error GoTo exitHere
Application.EnableEvents = False 'don't re-trigger this sub...
For i = 1 To lrow
With ws.Cells(i, 1)
'easier to test than to trap an error if non-numeric
If IsNumeric(.Value) Then
ws.Cells(i, 2) = .Value * 2
Else
ws.Select
.Select
MsgBox "Non-numeric value found!"
GoTo exitHere 'acceptable use of Goto I think
End If
End With
Next
'don't think you need a separate method for this...
If ws.ChartObjects.Count = 0 Then ws.Shapes.AddChart 'no need to loop for a count
'assuming there will only be one chart...
ws.ChartObjects(1).Chart.SetSourceData ws.Range(ws.Cells(1, 1), ws.Cells(lrow, 2))
exitHere:
If Err.Number <> 0 Then Debug.Print Err.Description
Application.EnableEvents = True
End Sub

Answer 2

In your Chrt1 procedure, this bit
For Each cht In s.ChartObjects
i = i + 1
Next
If i = 0 Then
Set c1 = s.Shapes.AddChart
End If
can be replaced by the following:
If s.ChartObjects.Count = 0 Then
Set c1 = s.Shapes.AddChart
End If
But what is c1 if you don't have to add a chart? You haven't defined it, and the On Error means you never find out that it's broken.
Assuming you want the last chart object to be the one that is changed:
If s.ChartObjects.Count = 0 Then
Set c1 = s.Shapes.AddChart
Else
Set c1 = s.ChartObjects(s.ChartObjects.Count)
End If
And you should declare c1 as a ChartObject.
Finally, remove the parentheses around r in this line:
c1.Chart.SetSourceData r

Answer 3

Thank you all for support. The basic code that works is shown below. It isn't the best looking but it does the job.
Sub Chrt1(r1 As Range, s1 As Worksheet)
Dim c1 As Shape
Dim s As Worksheet
Dim cht As ChartObject
Dim i As Integer
i = 0
Set r = r1
Set s = s1
For Each cht In s.ChartObjects
i = i + 1
Next
If i = 0 Then
Set c1 = s.Shapes.AddChart
End If
Set cht = s.ChartObjects(1)
cht.Chart.SetSourceData Source:=r
End Sub