CODEWITHSUNDEEP
c#winformscharts
Adrian
Adrian

Reputation: 1149

Setting X axis start to first value in first series, Chart control

I have a chart control on a windows form and recently changed the data I'm adding for the x axis from a string representing the date to a datetime type.

before changing I set the minimum X axis to 1 one so that the line starts at the Y axis now I'm using a date I can't do the same!

Is there a simple way to always start a line on a chart control at the Y axis?

Here is what I was doing and what I'm now trying:

chart2.ChartAreas[0].AxisX.Minimum = 1;

And was adding data to the chart thus:

seriesAve.Points.AddXY(strDate, average); //StrDate is a string, average is a double.

I now do it this way:

seriesAve.Points.AddXY(dt.Date, average);
DateTime tpdate = dateTimePicker1.Value;

// results in cannot convert datetime to double. 
chart2.ChartAreas[0].AxisX.Minimum = tpdate.Date;

Upvotes: 0

Views: 2420

Answers (1)

TaW
TaW

Reputation: 54463

All X- and Y-Values in a Chart are stored as doubles.

When adding a Value as as DateTime it gets converted to double implicitly with the ToOADate conversion function.

So when you need to set a value like the Minimum, Maximum etc you need to call this function in your code:

chart2.ChartAreas[0].AxisX.Minimum = tpdate.Date.ToOADate();

To convert it back to a DateTime use the DateTime.FromOADate function:

 DateTime tpdate = DateTime.FromOADate( chart2.ChartAreas[0].AxisX.Minimum);

Upvotes: 2

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