I have a .net program that lets the user select a chart from a dropdown and a data range then queries sql for the data to display the chart, everything is fine unless they pick a date range that would only return 1 value for that particular chart.
When this happens since there is only 1 point on the graph it does not display anything for line or area charts (it does work on bar and column).
i have thought about forcing the graph type to column if there is only 1 data point but was wondering if there was a setting i am missing that would allow a straight line on a line graph if there was only 1 datapoint.
well based on the idea of faking a 2nd point i came up with this that technically does what i want it to do.
this is called when there is only 1 point
foreach (Series ser in mainChart.Series)
{
ser.Points.AddY(ser.Points[0].YValues[0]);
}
I thought i might should add in case anyone else needs this that the code above needs to be after the chart has been DataBound (had .DataBind() called).
The definition of a line is basically the space between two points. You can't make a line out of one point without it being completely arbitrary.
Once you decide which angle the line should be oriented, just make a 2nd data point that fakes the line however you want it to look. But it actually sounds like you'd prefer a scatter plot, not a line chart. I would suggest changing the chart you use. You will most likely be able to draw lines on the scatter plot as well if needed.
I put this in my question but since it is the answer thought i would put it here also
this is called when there is only 1 point
foreach (Series ser in mainChart.Series)
{
ser.Points.AddY(ser.Points[0].YValues[0]);
}
I had the same problem and I solved it by placing another datapoint with the same values, so it is only to duplicate the same value, when there is only one, and you will place the point. So it would be something similar to this:
this.g.Series[serieID].Points.AddXY(x, y); // <-- Duplicate this line if you only have one value
Related
I have generated a chart in asp.net c#, which gets user data from the database and display it. Now I want to add a line to it which can indicate the baseline set by the user. I think it might be a new series which will be drawn from start to end. It will be ideal if the user is able to change it and on changing the line is redrawn. I have dates on x-axis and activity time on y axis. In the following picture I want line like Goal. Any suggestions?
There are two ways I know which can be used to achieve this line.
One is by adding the tag but the line will appear under the bars.
If you want the line to appear above the bars then you need to add another series of type line chart. Make its x axis secondary and specify the values so that it appears as a straight line. Hide the lengends and labels etc for line chart.
Been struggling with this through out the day. I have three series on a chart that look like this. NOTE: I am using the winforms control.
The values are being added based on calculations from input. I am using this code to add the values to each series.
this.chart1.Series["green"].Points.AddY(greenvalue);
this.chart1.Series["totalsaving"].Points.AddY(totalsavingvalue);
this.chart1.Series["blue"].Points.AddY(bluevalue);
The series properties I have set like this. Green and totalsaving are both set to StackedColumn, blue is set to Column for chart type.
I then have a button to start over which brings the user back to the input area and I am then using this code to clear the series values on the start over click.
chart1.Series["totalsaving"].Points.Clear();
chart1.Series["green"].Points.Clear();
chart1.Series["blue"].Points.Clear();
The same calculation click is being used as above to calculate and populate the series data. The problem is when I click the calculate button to calculate the values after I have cleared them, the total savings, and the green are missing. Just the blue is shown.
Am I doing something wrong with the way I am trying to clear the values so I can re calculate?
OK, from the edits, comments, our chat and the joim.me session enough data has accumulated to answer the question.
You have twisted the display by adding an extra data point to the blue series in the designer.
This point occupies slot 1 but remains invisible as its value = 0.
This pushes the next point in the series to slot 2
After clearing the points it is gone and the display doesn't work anymore.
The disappearing of the two columns probably was caused by hard coded widths.
You have several paths you can follow:
recreating the extra point with value = 0 before adding the real data (not recommended)
not adding the extra point in the first place but forcing each point into its slot by using Points.AddXY instead of Points.AddY with X being the slot.
not clearing the points but updating their values by using the SetValueY method. After all three data points have beend assigned their new values you need to call chart1.Invalidate() to make it show.
Fore easiest styling of all those properties, some of which are deeply burried inside of property strings(!), you may even decide to add and style&polish all three points in the designer and only update their y-values like this:
chart1.Series["green"].SetValueY(greenvalue);
chart1.Series["totalsaving"].SetValueY(totalsavingvalue);
chart1.Series["blue"].SetValueY(bluevalue);
chart1.Invalidate();
The choice is yours, but in any case I recommend setting the proper X values, be it in code or in the desginer..
As always I am going to get chastised for not providing enough code but I think I can describe this with minimal code and am hoping for a one line answer if it exists. If not I know how to code it myself with a small amount of effort.
I have a chart with a single series and chart area. In my code I add points dynamically like so:
Chart1.Series[0].Points.AddXY(1,1)
Chart1.Series[0].Points.AddXY(2,2)
Chart1.Series[0].Points.AddXY(3,3)
I am wondering if theres any way with a single function call or something easy and painless to rotate the points around the Y axis aka the furthest point on the right would appear on the left and vice versa
To put it another way it would be a function call that would basically act as if i had added the points in the opposite order aka:
Chart1.Series[0].Points.AddXY(3,3)
Chart1.Series[0].Points.AddXY(2,2)
Chart1.Series[0].Points.AddXY(1,1)
thanks!
Go through a for or foreach loop and push each point onto a stack. Then pop them back off the stack and add them back. You could also use a List.Reverse() method if your items are in a list.
I set up a draw rectangle to draw simple formatted text first aligned to the left as
*item 1
[1]Something
content
[2]Something else
<a> subsomething else
content
<b> another subsomething else
content
*item 2
The end.
and I would also like it to automatically create a new column (after checking for the longest string in the first column [drawn stuff on the left hand side]) to draw the rest into it.
In order to keep track of the paddings and itemized sections and subsections, I think of using a stack which I can push and pop the current and next positions needed to draw a text line each time I leave a content. Yet, I can't figure out how to jump back to a certain subsection position because stack doesn't offer an inline sub-scripting method.
Then I look into a hash-map (in C# I have tried Dictionary) to keep track of it and to access the value via specific key. For that I also use a external global variable to maintain the number of subsections the user may have entered and increase one each time a new subsection is created; and the float value is used to store the x-coordinate value for the drawstring to be done. This is complicated to me at least at present when I don't really have a nerve to go into it anymore. I can only receive false simulated outcomes.
So I am asking for an easier approach to tackle this problem, which I think is simple to many of you sure experiencing the same situation. I am desperately looking forward to seeing a short easy method to do this.
Draw formatted text using ..
..whatever works. I suggest a JLabel, which will render (simple) HTML/CSS formatted content.
See LabelRenderTest.java for an example.
Is it possible to force the display of grid lines on the chart with the dates for the extreme data points?
I've tried almost every configuration of following Chart DateTimeAxis properties: IntervalType, Interval, Minimum and Maximum but I wasn't satisfied with the result.
Setting properties Minimum and Maximum didn't solve the problem.
For instance (IntervalType="Days" , Interval="4" , Minimum="1/1/2010" , Maximum="1/31/2010"):
If I'm lucky I will generate some random data where only one extreme point will have the date with grid line.
Does somebody have an idea how to solve the problem mentioned above?
Edited to add
I added a bounty to this question since I really need a fast solution for this issue.
I am binding a series of specific pairs to my chart and I'd like to display excactly those given DateTime values on the x-axis.
Since these are usually dates like 6/30/11, 6/30/12 and so on, I can't use the Interval/IntervalType properties because adding 1 year or 365 days to 6/30/11 doesn't necessarily result in 6/30/12.
So what I need to do is either disable the "automatic axis label generation" of the DateTime axis or use another axis type.
LinearAxis doesn't work because it expects double values and CategoryAxis is not an option because it displays the axis labels between two tickmarks instead of underneath them.
I am very grateful for any help!
To be perfectly clear, here is what axis labels I need (taken from another chart component):
This is what I get so far with the Silverlight 4 Toolkit:
€: I also opened a thread in the official Silverlight Toolkit Support Forums.
The vertical lines are set where you specify an interval.
There is no vertical line for the data for 1/31/2010 as it does not fall on an interval.