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Thread: How to plot line graph using jfreechart reading from text file

  1. #1
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    Default How to plot line graph using jfreechart reading from text file

    hello,
    how to plot graph using jfreechart by extracting date format i.e yyyy-mm-dd hh:mm:ss:SS (in x-axis) and kilobyte(in y-axis) from text file.

    the following code contains code for plotting graph for double values.but how to do for date formats versus kilobyte which is mentioned above.am in trouble in this please help us .
    Thanks in advance

    import java.io.*;
    import java.util.*;//Scanner is included
    import org.jfree.chart.*;
    import org.jfree.chart.plot.PlotOrientation;
    import org.jfree.data.category.DefaultCategoryDataset;
    import org.jfree.data.general.DefaultPieDataset;
    import org.jfree.data.xy.*;
    import org.jfree.data.*;
    public class Plot_1
    {
    static Scanner scanner;
    static XYSeries series;
    //static File file;
    public static void main(String[] args)
    {
    plotResult();



    }//end of main





    //**********



    //Method that reads in an external file with numbers (doubles)

    //and plots the content in a line chart using JFreeChart





    public static void plotResult() {



    //Read in the file "calculation.txt" using Scanner and call hasNextDouble on it



    try {

    int index = 0;



    File file = new File("data.txt");

    series = new XYSeries("Pk");

    scanner = new Scanner(file);

    // Scanner scanner = new Scanner(file);

    while (scanner.hasNextDouble()) {

    series.add(index++,scanner.nextDouble());

    }

    scanner.close();

    }

    catch (FileNotFoundException e) {
    e.printStackTrace();

    }





    //Round off the doubles to two decimals - not done yet







    //Plot the line chart







    /*

    XYSeries series = new XYSeries("Pk");

    series.add(1, 0.8201791789916324 );

    series.add(2, 0.9727097916233601 );

    series.add(3, 0.9949972829175494);

    */



    XYDataset xyDataset = new XYSeriesCollection(series);





    JFreeChart chart = ChartFactory.createXYLineChart

    ("Temp = 85", "k", "Pk",xyDataset, PlotOrientation.VERTICAL, true, true, false);

    ChartFrame frame1=new ChartFrame("XYLine Chart",chart);

    frame1.setVisible(true);

    frame1.setSize(600,400);







    }//End of method





    //***************





    }//end of class

    in data.txt has following values
    0.0 0.8201791789916324 0.9727097916233601 0.9949972829175494 0.9930928370666989 0.9757838836701933 0.9610936247552858 0.9085823680551047 0.6555671891250983

    this works fine for the above values but how to plot for below values
    2012-02-13 15:14:43:038 234,567,123


  2. #2
    Super Moderator Norm's Avatar
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    Default Re: How to plot line graph using jfreechart reading from text file

    How do you want to convert a date and time to a number that can be plotted?
    If you don't understand my answer, don't ignore it, ask a question.

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    Default Re: How to plot line graph using jfreechart reading from text file

    we want it in the same format that i have mentioned above ie yyyy-mm-dd hh:mm:ss:SSS

  4. #4
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    Default Re: How to plot line graph using jfreechart reading from text file

    Can you explain how you want to plot date values?
    Given some dates like this: yyyy-mm-dd hh:mm:ss:SSS

    What do would you plot?
    If you don't understand my answer, don't ignore it, ask a question.

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    Default Re: How to plot line graph using jfreechart reading from text file

    I'm not fully clear as to what the requirement is, but if I understand correctly you might want to take a look at the DateAxis class
    DateAxis (JFreeChart Class Library (version 1.0.14))

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    Default Re: How to plot line graph using jfreechart reading from text file

    i want to plot the graph with date as x axis lyk in form of 2012-03-02 15:23:43:056 in y-axis a number..

  7. #7
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    Default Re: How to plot line graph using jfreechart reading from text file

    Does the API doc for the package you are using describe how to use dates on the x axis?
    If you don't understand my answer, don't ignore it, ask a question.

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    Default Re: How to plot line graph using jfreechart reading from text file


  9. #9
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    Default Re: How to plot line graph using jfreechart reading from text file

    we used dateaxis but it doesn't work.if thr is some sample code please let me know..its very urgent..

  10. #10
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    Default Re: How to plot line graph using jfreechart reading from text file

    What does the doc say for how to use the code?
    If you don't understand my answer, don't ignore it, ask a question.

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