multiple times .AddBar (ZedGraph)

[Suriv]

I use this code to add a bar to a graph:

Private Sub UpdateGraph(ByVal YValue As Double)
        Static PPList As New ZedGraph.PointPairList
        Dim PPDrawList As New ZedGraph.PointPairList
        Dim X As Double

        If PPList.Count <> 0 Then
            X = PPList.Item(PPList.Count - 1).X
        Else
            X = -1
        End If

        PPList.Add(X + 1, YValue)
        PPDrawList.Add(X + 1, YValue)

        zgcGraph.GraphPane.AddBar("", PPDrawList, Color.DarkRed)
        zgcGraph.Refresh()
End Sub

It works almost: the only problem I have is that every time I call the sub, the existing bar becomes thinner:
1st call:

2nd call:

3th call:

Any help would be appreciated .

 

[JohnH]

Bar becomes thinner means scale is changed.

 

[Suriv]

In some examples (site ZedGraph) they use .AxisChange.
But whether I place .AxisChange after "zgcGraph.Refresh()" or not, nothing changes.

 

[JohnH]

You have to call AxisChange before asking for a repaint (refresh).

 

[Suriv]

I still doesn't work with this:

zgcNetwork.GraphPane.AddBar("", PPDrawList, Color.DarkRed)
zgcNetwork.AxisChange()
zgcNetwork.Refresh()

 

[JohnH]

What doesn't work?

 

[Suriv]

The bars still become thinner if I add one.

 

[JohnH]

Of course they do, X-axis expands within same view.

 

[Suriv]

But that's the problem: they should not become thinner.

 

[JohnH]

Setting a fixed scale that fit what's needed should have solved it:

zgcGraph.GraphPane.XAxis.Scale.Max = 20

but it don't, so you have to explore the objects and properties to see if there is a setting for the fixed width BarItem, I can't find it. Btw, each BarItem instance is returned from the AddBar method call.

 

[Suriv]

OK, I've searched a lot, and found the solution here:
In Form_Load place this:

With zgcNetwork.GraphPane
            '... other Graph init code
            .BarSettings.Type = ZedGraph.BarType.Overlay
        End With

Seems to work .

 

[JohnH]

Great! There are many objects to explore here, I noticed the BarType before but don't find the description of any of them to fit what you asked for. I also did try a couple of them but not this one, the description didn't even sound vaguely related to getting fixed width bars.