AutoRange Questions

[Marty]

Hey Guy's

First of all thanks for all the help In my previous questions really help!!

I have finally gotten a plot to show up in my application but have some questions about setting up the axis. I want the x axis to show the hours of a specfied day but right now it only shows the hours for which there is data. I think it is autoranging but not sure. So what I want is static x axis range from 00:00-23:00. Can I also make the Y axis to some static range?

My last question relates to plotting a series. As the code stands now I am manually giving in random data for testing. I have a file that has the real times and y value saved in the following form.

25/09/2002 11:42:45:796 50
...
..
.

Reading the data out to stings is no problem but how can I modify
Fun.add(new Hour(1,new Day()),12);
to take 11:42:45:796 as the time stamp (I was thinking I could possibly work in milliseconds but maybe there may better way)

I posted my code bellow for reference

private void MakeGraph(){
//Function to Setup The Data Graph
BasicTimeSeries Data;
BasicTimeSeries Fun = new BasicTimeSeries("Quarterly Data",Hour.class);
Fun.add(new Hour(1,new Day()),12);
Fun.add(new Hour(3,new Day()),1);
Fun.add(new Hour(12,new Day()),4);



TimeSeriesCollection dataset = new TimeSeriesCollection();
dataset.addSeries(Fun);
JFreeChart chart = ChartFactory.createTimeSeriesChart("New Plot","Time","FlowRate",dataset,false);
//CategoryPlot plot = chart.getCategoryPlot();

chart.setBackgroundPaint(new Color( 212,208,200));
XYPlot plot = chart.getXYPlot();

HorizontalDateAxis axis = (HorizontalDateAxis)plot.getDomainAxis();
axis.setTickUnit(new DateUnit(Calendar.HOUR_OF_DAY, 1));
axis.getTickLabelFormatter().applyPattern("hh:mm");



ChartPanel chartPanel = new ChartPanel(chart);
jPanel16.add(chartPanel,BorderLayout.CENTER);


};

[David Gilbert]

Hi Marty,

(1) The axis range is calculated automatically by default. But you can easily set the axis range manually using the setRange(...) method in the ValueAxis class.

For example:

XYPlot plot = myChart.getXYPlot();
ValueAxis axis = plot.getRangeAxis();
axis.setRange(0.0, 5.0);

There is also a setRange method that accepts a Range object as the argument. DateRange, a subclass of Range, can make it a bit easier to set the range for a date axis:

DateRange range = new DateRange(date1, date2);
ValueAxis domainAxis = plot.getDomainAxis();
domainAxis.setRange(range);

(2) For your real time data, I would recommend using the Millisecond class.

Regards,

DG.

[Marty]

Thanks the axis stuff works!!
But I think something is still wrong
I made a date range from 0 to 86400000 to span a whole day.
But now my axis starts off with a blank then 02:00, 03:00, 04:00.......23:00, 00:00, blank, This does not seem right should it not start at 00:00 and go to 23:00,blank? How can I do This ?

[David Gilbert]

That will give you one day starting at midnight GMT on 1 Jan 1970. I'm pretty sure the axis will then display this in local time (but I can't remember without digging out the code).

You probably want to create two java.util.Date instances (using a Calendar for your locale) and set the axis range using these.

Regards,

DG.

[Marty]

It worked but the It still won't label 00:00 at the start of the axis any ideas