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VB chart with X axis in week numbers

Posted on 2015-01-03
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Last Modified: 2015-01-16
Dear Experts,

Is it possible to set the x axis of a vb chart to week numbers.

At the moment i set the x maximum to the current week number (as an integer) and the x minimum to the current week number minus 5 with an increment of 1.

Problem is that now we have passed year end i get negative numbers.

Eg.   -3 -2 -1 0 1
Need 50 51 52 53 1

The base data (week numbers extracted from dates) i have stored in an SQL table.

All help most welcome
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Question by:SweetingA
3 Comments
 
LVL 79

Expert Comment

by:David Johnson, CD, MVP
ID: 40529447
you have to add
if weeknumber < 0 weeknumber = weeknumber + 52
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Author Comment

by:SweetingA
ID: 40529455
I can't see how that will help when using vb charts, there are only a small number of things that i know can be set

X Axis minimum
X Axis maximum
X Axis interval

I am not sure if each interval can be set in a non sequential order

See my current code below

Dim sw as integer    
Dim ew as integer    
ew = DatePart(DateInterval.WeekOfYear, Date.Today, FirstDayOfWeek.Monday,
FirstWeekOfYear.FirstFourDays) + 1
sw = ew -6    
ChartStopsByDate.ChartAreas(0).AxisX.Minimum = sw    
ChartStopsByDate.ChartAreas(0).AxisX.Maximum = ew    
ChartStopsByDate.ChartAreas(0).AxisX.Interval = 1    
ChartStopsByDate.ChartAreas(0).AxisY.Minimum = 0    
ChartStopsByDate.ChartAreas(0).AxisY.Maximum = 60    
ChartStopsByDate.ChartAreas(0).AxisY.Interval = 10
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LVL 35

Accepted Solution

by:
Robert Schutt earned 500 total points
ID: 40535296
Try adding this to the end of your code:
        Chart1.DataBind() ' needed here (if not called already) to be able to iterate over .Points collection
        For p As Integer = 0 To Chart1.Series(0).Points.Count - 1
            Dim pt As DataPoint = Chart1.Series(0).Points(p)
            If pt.XValue >= sw And pt.XValue <= ew Then
                ' get year and week from the Thursday in each week - see http://en.wikipedia.org/wiki/ISO_week_date
                Dim datThursday As Date = Date.Today.AddYears(intTestYears).AddDays(7 * pt.XValue + DayOfWeek.Thursday - Date.Today.AddYears(intTestYears).DayOfWeek)
                pt.AxisLabel = String.Format("{0}W{1:00}", datThursday.Year, DatePart(DateInterval.WeekOfYear, datThursday, FirstDayOfWeek.Monday, FirstWeekOfYear.FirstFourDays))
            End If
        Next

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It's basically what David suggested, just a bit extended so you shouldn't have to revise this every year regarding 52/53...

Obviously for your requirement you don't need the string.format(), only
pt.AxisLabel = DatePart(DateInterval.WeekOfYear, datThursday, FirstDayOfWeek.Monday, FirstWeekOfYear.FirstFourDays)

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PS: I may be off by a week because of the increment, you may want to use 7 * (pt.XValue - 1)
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