I get different function behavior when using F8 or

Question

I created a specific function to format my charts. The main Sub and the Function code:

Private Sub UserForm_Initialize()

Dim mychart         As Chart
Dim ChartData       As Range
Dim ChartName       As String
Dim thiswb          As Workbook
Dim imageName       As String
Dim nColunas        As Long
Dim i, j, k         As Integer

Set thiswb = ThisWorkbook

k = 0

With thiswb.Sheets(4)
   MultiPage1.Pages.Add
   MultiPage1.Pages(k - 1).Controls.Copy
   MultiPage1.Pages(k).Paste
   Set ChartData = .Range("B2:B97")
   Set mychart = .Shapes.AddChart(xlXYScatterLines).Chart
     For j = mychart.SeriesCollection.Count To 1 Step -1
        If j = 1 Then
            Exit For
        End If
        mychart.SeriesCollection(j).Delete
     Next j
   mychart.SeriesCollection(1).Values = ChartData
   mychart.SeriesCollection(1).XValues = .Range(.Cells(2, 1), .Cells(97, 1))

   formatchart mychart

   With .Shapes(1).Chart.Axes(xlCategory)
     .MinimumScale = 0
     .MaximumScale = 1
   End With
   imageName = Application.DefaultFilePath & Application.PathSeparator & "GraficoTemp.gif"
   mychart.Export Filename:=imageName, FilterName:="GIF"
   .Shapes(1).Delete
   UserForm2.MultiPage1.Pages(k).Caption = "Total"
   UserForm2.Controls("Image" & k + 1).Picture = LoadPicture(imageName)

   Kill imageName

   With Controls("Listbox" & k + 1)
     .RowSource = "Total!B2:B97"
   End With
End With
End Sub

Function formatchart(mychart As Chart)
 With mychart
    .HasTitle = False
    .Legend.LegendEntries(1).Delete
    .Axes(xlCategory, xlPrimary).HasTitle = True
    .Axes(xlCategory, xlPrimary).AxisTitle.Caption = "Horas"
    .Axes(xlValue, xlPrimary).HasTitle = True
    .Axes(xlValue, xlPrimary).AxisTitle.Characters.Text = "Potência (W)"
 End With
 With mychart.Parent
    .Height = 295 
    .Width = 470 
    .Top = 100    
    .Left = 100  
 End With
End Function

As you can see, the first thing the "formatchart" function does is remove the chart title. What happens is, when I run the complete Sub by pressing F5, the title is not removed. But when I debug it by pressing F8, I follow all the steps of the Sub till the end and the title ends up being removed!

What could be happening?

Answer 1

Having reconstructed the scenario on my computer with the complete code the following two things made your code work for me:

(1) Change the function into a sub and (2) pass the ChartObject to the sub instead of Chart.

So, following this you'll have to

Dim mychart as ChartObject

and the initial setup will slightly change to

   Set mychart = .ChartObjects.Add(295, 470, 100, 100)
   mychart.Chart.ChartType = xlXYScatterLines

Instead of

formatchart mychart

you'll have to call the procedure like so

Call formatchart(mychart)

while changing the function to a procedure

Sub formatchart(mychart As ChartObject)

With mychart.Chart
   .HasTitle = False
   .Legend.LegendEntries(1).Delete
   .Axes(xlCategory, xlPrimary).HasTitle = True
   .Axes(xlCategory, xlPrimary).AxisTitle.Caption = "Horas"
   .Axes(xlValue, xlPrimary).HasTitle = True
   .Axes(xlValue, xlPrimary).AxisTitle.Characters.Text = "Potência (W)"
End With

With mychart
   .Height = 295
   .Width = 470
   .Top = 100
   .Left = 100
End With

End Sub

I believe the problem is that you are adding a Chart according to your variable declaration but a Shape when looking at your original code above:

Set mychart = .Shapes.AddChart(xlXYScatterLines).Chart

I am not sure yet why the function didn't work and had to be a procedure instead. So, since I don't fully comprehend the problem yet I can only offer what seems to work here. If this doesn't help then let's hope that someone else comes up with a more conclusive solution.