Examples of ptolemy.plot.Histogram

ptolemy.plot.Histogram
A histogram plotter. The plot can be configured and data can be provided either through a file with commands or through direct invocation of the public methods of the class. To read a file or a URL, use the read() method.
When calling the public methods, in most cases the changes will not be visible until paint() has been called. To request that this be done, call repaint(). One exception is addPoint(), which makes the affect of the new point visible immediately (or nearly immediately) if the plot is visible on the screen.
The ASCII format for the file file contains any number commands, one per line. Unrecognized commands and commands with syntax errors are ignored. Comments are denoted by a line starting with a pound sign "#". The recognized commands include those supported by the base class, plus a few more. The commands are case insensitive, but are usually capitalized. The number of data sets to be plotted does not need to be specified. Data sets are added as needed. Each dataset is identified with a color (see the base class).
The appearance of the histogram can be altered by the following commands:
```
 Bars: width Bars: width, offset 
```
The width is a real number specifying the width of the bars as a fraction of the bin width. It usually has a value less than or equal to one, and defaults to 0.5. The offset is a real number specifying how much the bar of the i ^th data set is offset from the previous one. This allows bars to "peek out" from behind the ones in front. It defaults to 0.15. Note that the frontmost data set will be the first one.
The width of each bin of the histogram can be specified using:
```
 BinWidth: width 
```
This is given in whatever units the data has. By default, each bin is centered at x = nw, where w is the width of the bin and n is an integer. That bin represents values in the range (x - w/2, x + w/2). The alignment of the bins can be changed with the following command:
```
 BinOffset: offset 
```
If this method is used with argument o, then each bin is centered at x = nw + o, and represents values in the range (x - w/2 + o, x + w/2 + o). So for example, if o = w/2, then each bin represents values from nw to (n + 1)w for some integer n. The default offset is 0.5, half the default bin width.
To specify data to be plotted, start a data set with the following command:
```
 DataSet: string 
```
Here, string is a label that will appear in the legend. It is not necessary to enclose the string in quotation marks. To start a new dataset without giving it a name, use:
```
 DataSet: 
```
In this case, no item will appear in the legend. New datasets are plotted behind the previous ones. The data itself is given by a sequence of numbers, one per line. The numbers are specified as strings that can be parsed by the Double parser in Java. It is also possible to specify the numbers using all the formats accepted by the Plot class, so that the same data may be plotted by both classes. The x data is ignored, and only the y data is used to calculate the histogram. @author Edward A. Lee @version $Id: Histogram.java,v 1.50 2007/12/06 18:23:52 cxh Exp $ @since Ptolemy II 0.3 @Pt.ProposedRating Yellow (cxh) @Pt.AcceptedRating Yellow (cxh)


    /** Create a new Histogram plot.
     *  @return A new plot object.
     */
    protected PlotBox _newPlot() {
        return new Histogram();
    }

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                    ((Histogram) _plot).setBars(width, offset);
                }
            } else if (elementName.equals("bin")) {
                // Ignore if plot is not an instance of Histogram.
                if (_plot instanceof Histogram) {
                    Histogram histogram = (Histogram) _plot;
                    String widthSpec = (String) _attributes.get("width");
                    String offsetSpec = (String) _attributes.get("offset");


                    // NOTE: If only one of these is given, then the other
                    // is ignored.
                    if ((widthSpec != null) && (offsetSpec != null)) {
                        double width = (Double.valueOf(widthSpec))
                                .doubleValue();
                        histogram.setBinWidth(width);


                        double offset = (Double.valueOf(offsetSpec))
                                .doubleValue();
                        histogram.setBinOffset(offset);
                    }
                }
            } else if (elementName.equals("dataset")) {
                // Override the base class to ignore things irrelevant
                // to histograms...

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    /** Create a new Plot object for the applet.  Derived classes can
     *  redefine this method to return a different type of plot object.
     */
    public PlotBox newPlot() {
        return new Histogram();
    }

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    /** Construct a plot with the specified command-line arguments.
     *  @param args The command-line arguments.
     *  @exception Exception If command line arguments have problems.
     */
    public HistogramMLApplication(String[] args) throws Exception {
        this(new Histogram(), args);
    }

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    public static void main(final String[] args) {
        try {
            Runnable doActions = new Runnable() {
                public void run() {
                    try {
                        new HistogramMLApplication(new Histogram(), args);
                    } catch (Exception ex) {
                        System.err.println(ex.toString());
                        ex.printStackTrace();
                    }
                }

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Related Classes of ptolemy.plot.Histogram

ptolemy.actor.lib.gui.HistogramPlotter

ptolemy.plot.plotml.HistogramMLApplet

ptolemy.plot.plotml.HistogramMLApplication

ptolemy.plot.plotml.HistogramMLParser

java.util.Random

java.awt.Graphics

java.io.BufferedWriter

java.io.PrintWriter

java.util.Enumeration

java.util.Hashtable

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