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bechbd
15 Posts |
 Posted - 04 Oct 2005 : 17:44:26
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I am having problems showing markers on a simple line graph. I am using the RT control and when a person clicks the graph a vetical line is put into the graph where the user clicked. After they are done with the realtime graph I display a standard graph(not using the RT engine just using the Chart2D engine) of the same data. My problem is that when I try to put the markers I saved from the real time graph into the standards graph nothing appears. This is the code I am using:
For i = 0 To ds.Tables("GSRMarker").Rows.Count - 1
Dim dr As DataRow = ds.Tables("GSRMarker").Rows(i)
Dim dt As Date = CDate(dr.Item("marker_time"))
Dim amarker As New Marker(thePlot1.GetChartObjScale(), DataCursor.MARKER_VLINE, dr.Item("marker_x"), dr.Item("marker_y"), 10.0, DataCursor.PHYS_POS)
amarker.SetColor(Color.Black)
amarker.SetLineWidth(10)
chartVu.AddChartObject(amarker)
'Add a text label to the line
pointLabel = New StringLabel(thePlot1.GetChartObjScale(), New Font("Microsoft Sans Serif", 8, FontStyle.Regular), dr.Item("marker_text"), dr.Item("marker_x"), dr.Item("marker_y"), DataCursor.PHYS_POS, DataCursor.JUSTIFY_CENTER, DataCursor.JUSTIFY_CENTER, 0)
' Nudge text to the right and up so that it does not write over marker
pointLabel.SetTextNudge(5, -5)
chartVu.AddChartObject(pointLabel)
Next
The data in the data set looks likt this:
marker_key marker_x marker_y
65 38629.651684768498 5.0862068965517205E-4
marker_text marker_time
Test 2005-10-04 03:38:26.483
Shouldnt this print out the markers the same as before? Also is there any way to specify a date for the marker instead of a double?
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quinncurtis
1164 Posts |
Posted - 04 Oct 2005 : 18:13:52
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The value you are using for the time data looks wrong. Most of the date values have a double value the order of magnitude 10^14, representing milliseconds.
If want to convert a ChartCalendar value to the proper double value, just use the GetCalendarMSecs method.
ChartCalendar xValue = new ChartCalendar();
double xxx = xValue.GetCalendarMsecs();
You should be working with strictly ChartCalendar objects until you can get the chart to work. Then work on converting your table values to ChartCalendar values.
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bechbd
15 Posts |
Posted - 04 Oct 2005 : 18:23:09
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| Thanks. Once I used the GetCalendarMsecs it worked fine. |
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Showing Markers
