[Solved] manipulating zedGraph x-axis

Question

0.00/5 (No votes)

See more:

Hi,
I trying to display the most 'recent' 50 dataPoints on zedGraph. My graph is updating in real-time but I only need to show the 50 points at a time.

Posted 11-May-11 5:24am

d.allen101

Updated 11-May-11 6:21am

Olivier Levrey

v2

Add a Solution

1 solution

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Olivier Levrey · Answer 1 · 2011-05-11T05:47:00

Solution 1

Once you reached 50 points, just remove the first point of your curve before adding the new one:

C++

void UpdateGraph(double x, double y)
{
    //get your curve
    CurveItem curve = graphControl1.GraphPane.CurveList[0];
    //if the max size is reached, remove the oldest point
    if (curve.NPts == 50)
        curve.RemovePoint(0);
    //add the new point
    curve.AddPoint(x, y);
    //update the graph
    graphControl1.AxisChange();
}

Posted 11-May-11 5:47am

Olivier Levrey

Comments

d.allen101 11-May-11 11:56am

that's what i was looking for! thanks olivier, but now how do i get the graph to 'reformat'? the 50 most recent plots are being displayed in the middle of the graph...it's leaving a gap on the far right hand side of the graph.

Olivier Levrey 11-May-11 12:01pm

You should set graphControl1.GraphPane.XAxis.Scale.MinAuto and MaxAuto properties to true.

d.allen101 11-May-11 12:00pm

i think what i trying to ask you is how do get the x-axis to also only show 50 increments so it's in sync with the dataPoints

d.allen101 11-May-11 12:07pm

never mind olivier, i figured out! thanks for everything!

Olivier Levrey 11-May-11 12:08pm

Ok good. Don't forget to accept this answer or vote for it ;)

d.allen101 11-May-11 12:12pm

hey olivier this is what did: if(curve.xAxis.Scale.NPts > 50) { graph.GraphPane.XAxis.Scale.Min = graph.GraphPane.XAxis.Scale.Max - 50;}

Olivier Levrey 11-May-11 12:14pm

So you didn't remove the points. You just moved your x axis.
It is a good solution if you want to keep all points.