I have a chart with 4 series. Each series is added at different times, depending on what is switched on/off of the app features. All series have on the x axis:
DateTime.Now.ToString("mm:ss")
so I thought that at any time the series data are available, they will be added to the chart at that time that happens on x axis. Looks like is not like that. This chart shows a blue line and a red line. The blue line started first then after few seconds I checked checkBox2 which activate the red line, that happened exactly at 27:38 (where you can see a small drop on the blue line). I do not understand why the red line starts at the far left of the chart and not at the time that was triggered (27:38).
This is my code:
string reqTemp = textBox9.Text;
textBox2.Text = avTemp.ToString("F");
this.chart1.Series["Actual Temperature"].Points.AddXY(DateTime.Now.ToString("mm:ss"), avTemp);
if (checkBox2.Checked == true)
{
this.chart1.Series["Requested Temperature"].Points.AddXY(DateTime.Now.ToString("mm:ss"), reqTemp);
}
How can I have the series added after the first one was already running starting at the time they are switched on? Basically all series sharing the same x axis.
All series have on the x axis:
DateTime.Now.ToString("mm:ss")
I read this as: All your X-Values are added as formatted strings; this is usually a bad thing, as by doing so the X-Values have become all 0s, read: meaningless.
If you want to preserve the DateTime values you need to add the DataPoints with valid X-Values!
So you should add them as AddXY(yourDateTimeXValue, yourYValue); and set the Format as
chart1.ChartAreas[0].AxisX.LabelStyle.Format = "mm:ss";
Related
I have two columns in my datagridview and I want my first column to be the X axis while the second column to be the Y axis in my chart.
it is suppose to create a line graph.
Usually there is no difference between line, point or bar charttypes; simply loop over the rows to add the DataPoints!
But in your case the x-values (timestampdata) are all the same! For Line and Points charttypes this will mean that all Points get lumped onto the same spot. Bar charts indeed wouldn't do that.
If you can't (or don't want to) get good data you need to set :
yourSeries1.IsXValueIndexed = true;
Then all DataPoints will be lined up, ignoring the x-values.
I'm creating a C# WinForms app that displays nearly real-time, time-based (~5s refresh rate) data from a SQL server using the WinForms Line Chart control. The fetching and inserting of data on the chart works just fine, it is just the formatting I'm having issues with. The X-Axis contains the DateTime of each point and is set to display the date on the X-Axis.
The problem I'm encountering is the X-Axis labels not being displayed evenly across the chart. I'm able to get the number of axis labels that I want, but they are not consistently in the same position on the axis.
Ideally I'd like to be able to set the number of x-axis labels, have a label at each ends of the chart, then the remaining labels evenly split across the rest of the chart. Then every time new data is added to the chart the labels stay in the exact same spot, just the label text is updated.
Here are two pictures that should make it clear what I'm after.
The first picture is data from the range 16:10:00 to 16:11:00.
This is what I would like for any start/end date:
The second picture shows what happens when I add 5 seconds of new data and remove 5 seconds of old data.
Chart after refreshing with new data:
Here is the snippet of code that I use for my x-axis formatting.
chart.ChartAreas[0].AxisX.IntervalType = DateTimeIntervalType.Seconds;
chart.ChartAreas[0].AxisX.Interval = timeDiff.TotalSeconds / numXTicks;
chart.ChartAreas[0].AxisX.Minimum = timeMin.ToOADate();
chart.ChartAreas[0].AxisX.Maximum = timeMax.ToOADate();
chart.ChartAreas[0].AxisX.LabelStyle.Format = "yyyy-MM-dd" + Environment.NewLine + "HH:mm:ss";
chart.ChartAreas[0].AxisX.LabelStyle.IsEndLabelVisible = true;
chart.ChartAreas[0].AxisX.IsMarginVisible = true;
Thanks for any help. Long time lurker and first time poster.
For anyone that may be curious I found a reasonable workaround by setting the IntervalType to MilliSeconds.
chart.ChartAreas[0].AxisX.IntervalType = DateTimeIntervalType.Milliseconds;
chart.ChartAreas[0].AxisX.Interval = unixDiff.TotalMilliseconds / numXTicks;
While this doesn't necessarily fix the x-axis labels in place, by having an Interval will multiply evenly across the chart and not result in a fraction of an interval the labels will be neatly labeled across the entire chart.
I am creating a chart in WinForms in C# and the X-axis is indexed.
I have 10000 points in the chart series
For some reason, the X-axis labels are labeled From 1 to 10001. Which means when I set the X-value (time) for any point, it does not get displayed for the 10001th label.
I tried setting the following parameters, none of which helped
chart1.ChartAreas[0].AxisX.MajorTickMark.IntervalOffset = -1;
chart1.ChartAreas[0].AxisX.LabelStyle.IntervalOffset = -1;
chart1.ChartAreas[0].AxisX.IsStartedFromZero = true;
chart1.ChartAreas[0].AxisX.IsLabelAutoFit = false;
None of this did anything to help, my chart labels are still reading from 1 to 10001, and no matter how much I zoom in (with added zoom controls) the labels still read on every interval ending with 1. Like 1001, 2001, 3001, .. etc.
How can I change this to read from 0 to 10000? And only show lines and labels on intervals ending with 0
Thanks
EDIT:
The minimum and the maximum were already set, in the screenshot you see below, all the X values are correctly indexed, but for some reason the chart display value 10001
And I do not wish to set the value to the Maximum to 10000 in this case, it will prevent the label from showing up but it will also prevent the ability to scroll the axis past the last measurement.
Apologies for not able to find a more suitable title for my issue here. I am using MS Chart control in my project to plot real-time values from a source that generates 4 values per second. X axis is time at which the value is generated and the Y axis the value itself. I am dynamically adding a new series for each variable. All the variables are manually added by the user one-by-one and then a series will be created for it.
Basic part seems to be working except the chart is plotting values from different series at different time even though the values are generated at same time. Following image shows the exact issue:
As you can see, the list in bottom is a list of values I am plotting. It shows values and the time they are generated at (hh:mm:ss.ms)
When I plot these values, which is shown in the chart area, this is what I get. See the location of the latest values (marked by red arrows) for all the series. The latest value is at different time even though they all are generated at the same time. Every series seem to have a separate X axis. I expected the latest Y values should be plotted at the same X value and that should be shown at the extreme right of the chart. More like the bottom most series is being shown. That is the very first series created. Every time only the series that is created first works fine and the following series lags for some reason.
Chart, share X axis between different series looks like similar issue to mine but is not answered.
Chart Multiple series different length generate duplicate x axis seems to be the exact issue I am having but the difference is - I am plotting a real-time graph. I can't loop through every series after adding a new data point to mark whether a point is empty or not. That will be a lot of overhead. Some Googling suggested use of InsertEmptyPoints() to every series to match all the X axis. MS Chart sample code also explains using this method but I am not sure where/when to use this method. If I use it after creating a series but before adding a data point - the code crashes. I have tried something like this:
_chart.Series.Add(series);
_chart.DataManipulator.InsertEmptyPoints(250, IntervalType.Milliseconds, name);
Am I doing something wrong here? Thanks for any help offered.
I got this working by adding empty points. I filled every series with max possible data points to begin with. Say I want to show 100 data points in every series before I start deleting the oldest (Points[0]) data point so that my chart will look like it's moving from right to left. In that case I will add 100 empty points while creating every series using:
for (int i = 0; i < 100; i++)
{
series.Points.AddXY(i.ToString(), double.NaN);
series.Points[i].AxisLabel = " ";
}
Then, while adding real data just do it normal way:
_chart.Series[index].Points.AddXY(time, YValue);
// delete more than max. points.
if (_chart.Series[index].Points.Count > MaxTrendPoints - 10) // -10 is adjustment. Got it by trial and error.
_chart.Series[index].Points.RemoveAt(0);
Basically my C# chart control has a datetime type x axis.
I am plotting 2 different time period, but do not want the empty points to even show up in the x axis.
Is it possible to change a certain property of the chart control to hide the period of time which does not have point.
I implemented something similar to your problem, here is what I used (C#), it may help:
Chart4.DataManipulator.InsertEmptyPoints(1, System.Web.UI.DataVisualization.Charting.IntervalType.Number, Chart4.Series["s3"]);
Chart4.DataManipulator.InsertEmptyPoints(1, System.Web.UI.DataVisualization.Charting.IntervalType.Number, Chart4.Series["s2"]);
Chart4.Series["s3"].EmptyPointStyle.Color = System.Drawing.Color.Transparent;
Chart4.Series["s2"].EmptyPointStyle.Color = System.Drawing.Color.DarkGreen;
You can specify the intervalType.Days in place of number..
datamanipulator.ignoreemptypoints = true;
from this article on grouping:
http://msdn.microsoft.com/en-us/library/dd489213.aspx
If you don't want the x-axis to be scaled to the x-values simply set the/all series to be indexed:
foreach (Series s in chart1.Series) s.IsXValueIndexed = true;
Now each DataPoint will sit at its index position instead of its x-value position. Note that this also mean that you need to make sure all Series aligned, read all have a DataPoint at the same indices, be it a real one or an Empty one or else the will shift..!