Chart Control - xtpChartScaleDateTime with Zoom

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xtpChartScaleDateTime with Zoom

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Category: Codejock Products
Forum Name: Chart Control
Forum Description: Topics Related to Codejock Chart Control
URL: http://forum.codejock.com/forum_posts.asp?TID=18159
Printed Date: 21 November 2024 at 2:18pm
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Topic: xtpChartScaleDateTime with Zoom

Posted By: Andrew666
Subject: xtpChartScaleDateTime with Zoom
Date Posted: 03 April 2011 at 3:27pm

If the ArgumentScaleType = xtpChartScaleDateTime and the chart zoom is applied, dates are always displayed and never times. This means that when you zoom to less than one day in axis range, you just get the date repeated multiple times at the major tick points. Not much use.

Is there a way to display time as well as date in these circumstances? Thanks.

Here's a screen shot illustrating the issue:

Replies:

Posted By: mimue
Date Posted: 04 April 2011 at 2:54am

I have done this with a workaround. I use the CustomLabels. The sample sets the timelabels every 15 minutes.

Dim DateTimeMin As Date, DateTimeMax As Date, DateTimeAkt As Date

DateTimeMin = [Min-DateTime of ChartSeries]
DateTimeMax = [Max-DateTime of ChartSeries]

DateTimeAkt = CDate(Int((CDbl(DateTimeMin) * 96) + 0.5) / 96)
Diagram.AxisX.CustomLabels.Add Format(DateTimeAkt, "h:nn"), DateTimeAkt
Do Until DateTimeAkt > DateTimeMax
DateTimeAkt = DateTimeAkt + TimeSerial(0, 15, 0)
Diagram.AxisX.CustomLabels.Add Format(DateTimeAkt, "h:nn"), DateTimeAkt
Loop

-------------
Product: Xtreme SuitePro (ActiveX) version 15.0.1
Platform: Windows 7 (x64)
Language: Visual Basic 6.0

Posted By: Andrew666
Date Posted: 04 April 2011 at 4:31am

Thanks for that - but it appears that every time the zoom changes I'd have to re-calculate this for the label periods to fit properly? Looks like your solution would be fine on a fixed (no zoom allowed) axis though - thanks.

Posted By: mimue
Date Posted: 04 April 2011 at 4:58am

I use the zoom too, it works. Perhaps the rest of the code helps:

Dim DateTimeMin As Date, DateTimeMax As Date, DateTimeAkt As Date
Dim Style As New ChartLineSeriesStyle
Dim Series As ChartSeries

If ChartControl.Content.Series.count > 0 Then
     ChartControl.Content.Series.DeleteAll
End If

Set Series = ChartControl.Content.Series.Add("")
Series.ArgumentScaleType = xtpChartScaleDateTime

Set Series = ChartControl.Content.Series.Add("")
Series.ArgumentScaleType = xtpChartScaleDateTime

'Fill Series
DateTimeMin = [Min-DateTime of ChartSeries]
DateTimeMax = [Max-DateTime of ChartSeries]

'----> Do
'---->    Series.Points.Add CDate(chartArgument), chartValue
'----> Loop

'Set Style and some settings
Set Series.Style = Style

Style.Label.visible = False
Style.Marker.Size = 5
Style.Marker.visible = True

Set Diagram = ChartControl.Content.Diagrams(0)
With Diagram
       .AllowScroll = True
       .AllowZoom = True
       With .AxisX
            With .Range
                 .AutoRange = True
                 .ViewAutoRange = True
            End With
       End With
       With .AxisY
            .AllowZoom = False
            With .Range
                 .AutoRange = True
                 .ViewAutoRange = True
            End With
       End With
End With

'CustomLabels
DateTimeAkt = CDate(Int((CDbl(DateTimeMin) * 96) + 0.5) / 96)
Diagram.AxisX.CustomLabels.Add Format(DateTimeAkt, "h:nn"), DateTimeAkt
Do Until DateTimeAkt > DateTimeMax
     DateTimeAkt = DateTimeAkt + TimeSerial(0, 15, 0)
     Diagram.AxisX.CustomLabels.Add Format(DateTimeAkt, "h:nn"), DateTimeAkt
Loop

-------------
Product: Xtreme SuitePro (ActiveX) version 15.0.1
Platform: Windows 7 (x64)
Language: Visual Basic 6.0

Posted By: Andrew666
Date Posted: 04 April 2011 at 5:20am

Interesting - I'll give that a try - thanks for taking the time to do the complete post.

Posted By: Andrew666
Date Posted: 04 April 2011 at 9:30am

That appears to give me a fixed set of X-axis labels, 15 minutes apart. This means that if the period is over a number of days I get hundreds of labels, which are increasingly removed as I zoom in, until eventually I can read them.

Unfortunately the Chart control has no Zoom-related events, so I can't dynamically change this