Solved

Change X-axis label's value in TimeSeries chart (jfreechart)

Posted on 2004-04-12
13
3,715 Views
Last Modified: 2007-12-19
Sample code as below:

XYPlot plot = chart.getXYPlot();
DateAxis axis = (DateAxis) plot.getDomainAxis();
axis.setTickUnit(new DateTickUnit(DateTickUnit.HOUR, 1,new SimpleDateFormat("dd-MMM HH:mm")));

the above coding will display the dd-MMM HH:mm as my X-axis label. just wonder is there anyway to display the dd-MMM as X-axis label if the dd-MMM is enter to a new date.

thanks
0
Comment
Question by:Kennywen
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 7
  • 6
13 Comments
 
LVL 30

Expert Comment

by:Mayank S
ID: 10804340
Do you want to change the display on some specific event or automatically, after a period of time? If so, you might need a separate thread and keep a timer.
0
 

Author Comment

by:Kennywen
ID: 10804355
axis.setTickUnit(new DateTickUnit(DateTickUnit.HOUR, 1,new SimpleDateFormat("dd-MMM HH:mm")));

actually the above code will display the date and time on the X-axis label. E.g. 12-Apr 18:16, 12-Apr 19:16, 12-Apr 20:16, 12-Apr 21:16, 12-Apr 22:16 and so on. But i want to display the date only when the date is not exist recently on the X-axis label E.g. 12-Apr 18:16, 19:16, 20:16, 21:16, 22:16, 23:16, 13-Apr 00:16, 01:16 and so on. Any idea to doing above example?

thanks
0
 
LVL 30

Expert Comment

by:Mayank S
ID: 10804404
Perhaps you can display the date once and then use: new SimpleDateFormat ( "HH:mm" ) ) ) ;
0
Industry Leaders: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

 

Author Comment

by:Kennywen
ID: 10804425
can you provide more code for me?

thanks
0
 
LVL 30

Expert Comment

by:Mayank S
ID: 10804562
Just that:

>> axis.setTickUnit(new DateTickUnit(DateTickUnit.HOUR, 1,new SimpleDateFormat("dd-MMM HH:mm")));

would become:

axis.setTickUnit ( new DateTickUnit ( DateTickUnit.HOUR, 1, new SimpleDateFormat ( "HH:mm" ) ) ) ;
0
 

Author Comment

by:Kennywen
ID: 10809862
>> axis.setTickUnit ( new DateTickUnit ( DateTickUnit.HOUR, 1, new SimpleDateFormat ( "HH:mm" ) ) ) ;

this will display the HH:mm as the X-axis label. but i want to display the date also when it's a new date.
0
 
LVL 30

Expert Comment

by:Mayank S
ID: 10810502
Do you have some method/ means for reading the contents which have been displayed? If so, then it might be solved.
0
 

Author Comment

by:Kennywen
ID: 10810768
Currently i don't have any solution yet because:
>> axis.setTickUnit ( new DateTickUnit ( DateTickUnit.HOUR, 1, new SimpleDateFormat ( "HH:mm" ) ) ) ;
will set the HH:mm as the X-axis label and

>> axis.setTickUnit ( new DateTickUnit ( DateTickUnit.HOUR, 1, new SimpleDateFormat ( "dd:MMM" ) ) ) ;
will set the dd:MMM as the X-axis label

so how can i display the dd:MMM when it's a new day (E.g. 13 - Apr, 14 - Apr and so on) but display the HH:mm as the X-axis label

E.g.
12-Apr 18:16, 19:16, 20:16, 21:16, 22:16, 23:16, 13-Apr 00:16, 01:16
0
 
LVL 30

Expert Comment

by:Mayank S
ID: 10810989
Try this:

Calendar cal = Calendar.getInstance () ;
String format = ( cal.get ( Calendar.HOUR ) == 0 && cal.get ( Calendar.MINUTE ) == 0 ) ? "dd-MMM HH:mm" : "HH:mm" ;

axis.setTickUnit ( new DateTickUnit ( DateTickUnit.HOUR, 1, new SimpleDateFormat ( format ) ) ) ;
0
 

Author Comment

by:Kennywen
ID: 10811020
tested and it display the HH:mm as my X-axis label. But the date is not appear in the x-axis.
0
 
LVL 30

Expert Comment

by:Mayank S
ID: 10811711
It will display a new date when a new day will start. Set your system time to something like 23:59 and see if it prints the date when a new date starts.
0
 

Author Comment

by:Kennywen
ID: 10811726
X-axis label is depend on my database's data and one of my database column is the date.
0
 
LVL 30

Accepted Solution

by:
Mayank S earned 50 total points
ID: 10811786
Then you can try this:

Calendar cal = Calendar.getInstance () ;
cal.setTime ( theDateFromTheDatabase ) ;
String format = ( cal.get ( Calendar.HOUR ) == 0 && cal.get ( Calendar.MINUTE ) == 0 ) ? "dd-MMM HH:mm" : "HH:mm" ;
0

Featured Post

Free Tool: Site Down Detector

Helpful to verify reports of your own downtime, or to double check a downed website you are trying to access.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
How  can  i  resolve  HTTP Status 404 -? 8 59
mysql jsp example issue 32 71
Notify sent to other threads in Java 9 43
Java List 4 36
Java had always been an easily readable and understandable language.  Some relatively recent changes in the language seem to be changing this pretty fast, and anyone that had not seen any Java code for the last 5 years will possibly have issues unde…
Java functions are among the best things for programmers to work with as Java sites can be very easy to read and prepare. Java especially simplifies many processes in the coding industry as it helps integrate many forms of technology and different d…
Viewers learn about the “while” loop and how to utilize it correctly in Java. Additionally, viewers begin exploring how to include conditional statements within a while loop and avoid an endless loop. Define While Loop: Basic Example: Explanatio…
This tutorial covers a step-by-step guide to install VisualVM launcher in eclipse.

749 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question