ptolemy.plot
Class PlotBox

java.lang.Object
  |
  +--java.awt.Component
        |
        +--java.awt.Container
              |
              +--java.awt.Panel
                    |
                    +--ptolemy.plot.PlotBox

Direct Known Subclasses:

Histogram, Plot

public class PlotBox

extends java.awt.Panel

This class provides a labeled box within which to place a data plot. A title, X and Y axis labels, tick marks, and a legend are all supported. Zooming in and out is supported. To zoom in, drag the mouse downwards to draw a box. To zoom out, drag the mouse upward.

The box can be configured either through a file with commands or through direct invocation of the public methods of the class.

When calling the methods, in most cases the changes will not be visible until paint() has been called. To request that this be done, call repaint().

A small set of key bindings are provided for convenience. They are:

• Cntr-c: Export the plot to the clipboard (in PlotML).
• D: Dump the plot to standard output (in PlotML).
• E: Export the plot to standard output in EPS format.
• F: Fill the plot.
• H or ?: Display a simple help message.
• Cntr-D or Q: quit

These commands are provided in a menu by the PlotFrame class.

At this time, the two export commands produce encapsulated postscript tuned for black-and-white printers. In the future, more formats may supported. Also at this time (jdk 1.2), Java's interface the clipboard does not work, so Cntr-c might not accomplish anything. Exporting to the clipboard and to standard output, in theory, is allowed for applets, unlike writing to a file. Thus, these key bindings provide a simple mechanism to obtain a high-resolution image of the plot from an applet, suitable for incorporation in a document. However, in some browsers, exporting to standard out triggers a security violation. You can use Sun's appletviewer instead.

To read commands from a file or URL, the preferred technique is to use one of the classes in the plotml package. That package supports both PlotML, an XML extension for plots, and a historical file format specific to ptplot. The historical file format is understood by the read() method in this class. The syntax of the historical format, documented below, is rudimentary, and will probably not be extended as ptplot evolves. Nonetheless, we document it here since it is directly supported by this class.

The historical format for the file allows 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:

 TitleText: string
 XLabel: string
 YLabel: string
 

These commands provide a title and labels for the X (horizontal) and Y (vertical) axes. A string is simply a sequence of characters, possibly including spaces. There is no need here to surround them with quotation marks, and in fact, if you do, the quotation marks will be included in the labels.

The ranges of the X and Y axes can be optionally given by commands like:

 XRange: min, max
 YRange: min, max
 

The arguments min and max are numbers, possibly including a sign and a decimal point. If they are not specified, then the ranges are computed automatically from the data and padded slightly so that datapoints are not plotted on the axes.

The tick marks for the axes are usually computed automatically from the ranges. Every attempt is made to choose reasonable positions for the tick marks regardless of the data ranges (powers of ten multiplied by 1, 2, or 5 are used). However, they can also be specified explicitly using commands like:

 XTicks: label position, label position, ...
 YTicks: label position, label position, ...
 

A label is a string that must be surrounded by quotation marks if it contains any spaces. A position is a number giving the location of the tick mark along the axis. For example, a horizontal axis for a frequency domain plot might have tick marks as follows:

 XTicks: -PI -3.14159, -PI/2 -1.570795, 0 0, PI/2 1.570795, PI 3.14159
 

Tick marks could also denote years, months, days of the week, etc.

The X and Y axes can use a logarithmic scale with the following commands:

 XLog: on
 YLog: on
 

The grid labels represent powers of 10. Note that if a logarithmic scale is used, then the values must be positive. Non-positive values will be silently dropped.

By default, tick marks are connected by a light grey background grid. This grid can be turned off with the following command:

 Grid: off
 

It can be turned back on with

 Grid: on
 

Also, by default, the first ten data sets are shown each in a unique color. The use of color can be turned off with the command:

 Color: off
 

It can be turned back on with

 Color: on
 

Finally, the rather specialized command

 Wrap: on
 

enables wrapping of the X (horizontal) axis, which means that if a point is added with X out of range, its X value will be modified modulo the range so that it lies in range. This command only has an effect if the X range has been set explicitly. It is designed specifically to support oscilloscope-like behavior, where the X value of points is increasing, but the display wraps it around to left. A point that lands on the right edge of the X range is repeated on the left edge to give a better sense of continuity. The feature works best when points do land precisely on the edge, and are plotted from left to right, increasing in X.

All of the above commands can also be invoked directly by calling the the corresponding public methods from some Java procedure.

This class uses features of JDK 1.1, and hence if used in an applet, it can only be viewed by a browser that supports JDK 1.1.

Version:

$Id: PlotBox.java,v 1.161 1999/08/19 15:34:12 cxh Exp $

Author:

Edward A. Lee, Christopher Hylands

See Also:

Serialized Form

Inner Class Summary

class	PlotBox.DragListener
class	PlotBox.ZoomListener

Field Summary

protected java.awt.Color	_background
protected int	_bottomPadding
protected static java.awt.Color[]	_colors
java.net.URL	_documentBase
protected java.awt.Color	_foreground
protected boolean	_grid
protected int	_height
protected int	_leftPadding
protected static double	_LOG10SCALE
protected int	_lrx
protected int	_lry
protected static double	_PADDING
protected boolean	_rangesGivenByZooming
protected int	_rightPadding
protected int	_topPadding
protected int	_ulx
protected int	_uly
protected boolean	_usecolor
protected int	_width
protected boolean	_wrap
protected double	_xBottom
protected double	_xhighgiven
protected boolean	_xlog
protected double	_xlowgiven
protected double	_xMax
protected double	_xMin
protected boolean	_xRangeGiven
protected double	_xscale
protected double	_xTop
protected double	_yBottom
protected double	_yhighgiven
protected boolean	_ylog
protected double	_ylowgiven
protected double	_yMax
protected double	_yMin
protected boolean	_yRangeGiven
protected double	_yscale
protected double	_yTop

Fields inherited from class java.awt.Component

BOTTOM_ALIGNMENT, CENTER_ALIGNMENT, LEFT_ALIGNMENT, RIGHT_ALIGNMENT, TOP_ALIGNMENT

Constructor Summary

PlotBox()
Construct a plot box with a default configuration.

Method Summary

protected void	_drawPlot(java.awt.Graphics graphics, boolean clearfirst) Draw the axes using the current range, label, and title information.
protected void	_drawPoint(java.awt.Graphics graphics, int dataset, long xpos, long ypos, boolean clip) Put a mark corresponding to the specified dataset at the specified x and y position.
protected void	_help() Display basic information in its own window.
protected boolean	_parseLine(java.lang.String line) Parse a line that gives plotting information.
protected void	_setButtonsVisibility(boolean vis) Deprecated.
protected void	_write(java.io.PrintWriter output) Write plot information to the specified output stream in PlotML.
protected void	_writeOldSyntax(java.io.PrintWriter output) Deprecated.
void	addLegend(int dataset, java.lang.String legend) Add a legend (displayed at the upper right) for the specified data set with the specified string.
void	addXTick(java.lang.String label, double position) Specify a tick mark for the X axis.
void	addYTick(java.lang.String label, double position) Specify a tick mark for the Y axis.
void	clear(boolean axes) If the argument is true, clear the axes.
void	export(java.io.OutputStream out) Export a description of the plot.
void	fillPlot() Rescale so that the data that is currently plotted just fits.
boolean	getColor() Return whether the plot uses color.
static java.awt.Color	getColorByName(java.lang.String name) Convert a color name into a Color.
java.lang.String	getDataurl() Deprecated.
java.net.URL	getDocumentBase() Deprecated.
boolean	getGrid() Return whether the grid is drawn.
java.lang.String	getLegend(int dataset) Get the legend for a dataset, or null if there is none.
java.awt.Dimension	getMinimumSize() Get the minimum size of this component.
java.awt.Dimension	getPreferredSize() Get the preferred size of this component.
java.lang.String	getTitle() Get the title of the graph, or an empty string if there is none.
java.lang.String	getXLabel() Get the label for the X (horizontal) axis, or null if none has been set.
boolean	getXLog() Return whether the X axis is drawn with a logarithmic scale.
double[]	getXRange() Get the X range.
java.util.Vector[]	getXTicks() Get the X ticks that have been specified, or null if none.
java.lang.String	getYLabel() Get the label for the Y (vertical) axis, or null if none has been set.
boolean	getYLog() Return whether the Y axis is drawn with a logarithmic scale.
double[]	getYRange() Get the Y range.
java.util.Vector[]	getYTicks() Get the Y ticks that have been specified, or null if none.
void	init() Deprecated.
void	paint(java.awt.Graphics graphics) Paint the component contents, which in this base class is only the axes.
void	parseFile(java.lang.String filespec) Deprecated.
void	parseFile(java.lang.String filespec, java.net.URL documentBase) Deprecated. This method is deprecated. Use read() instead.
void	read(java.io.InputStream in) Read commands and/or plot data from an input stream in the old (non-XML) file syntax.
void	read(java.lang.String command) Read a single line command provided as a string.
void	samplePlot() Do nothing in this base class.
void	setBackground(java.awt.Color background) Set the background color.
void	setBounds(int x, int y, int width, int height) Move and resize this component.
void	setButtons(boolean visible) If the argument is true, make a fill button visible at the upper right.
void	setColor(boolean useColor) If the argument is false, draw the plot without using color (in black and white).
void	setDataurl(java.lang.String filespec) Deprecated.
void	setDocumentBase(java.net.URL documentBase) Deprecated.
void	setForeground(java.awt.Color foreground) Set the foreground color.
void	setGrid(boolean grid) Control whether the grid is drawn.
void	setLabelFont(java.lang.String name) Set the label font, which is used for axis labels and legend labels.
void	setSize(int width, int height) Set the size of the plot.
void	setTitle(java.lang.String title) Set the title of the graph.
void	setTitleFont(java.lang.String name) Set the title font.
void	setWrap(boolean wrap) Control whether the X axis is wrapped.
void	setXLabel(java.lang.String label) Set the label for the X (horizontal) axis.
void	setXLog(boolean xlog) Specify whether the X axis is drawn with a logarithmic scale.
void	setXRange(double min, double max) Set the X (horizontal) range of the plot.
void	setYLabel(java.lang.String label) Set the label for the Y (vertical) axis.
void	setYLog(boolean ylog) Specify whether the Y axis is drawn with a logarithmic scale.
void	setYRange(double min, double max) Set the Y (vertical) range of the plot.
void	update(java.awt.Graphics g) Override update so that it doesn't clear the plot.
void	write(java.io.OutputStream out) Write the current data and plot configuration to the specified stream in PlotML syntax.
void	write(java.io.OutputStream out, java.lang.String dtd) Write the current data and plot configuration to the specified stream in PlotML syntax.
void	writeOldSyntax(java.io.OutputStream out) Deprecated.
void	zoom(double lowx, double lowy, double highx, double highy) Zoom in or out to the specified rectangle.

Methods inherited from class java.awt.Panel

addNotify

Methods inherited from class java.awt.Container

add, add, add, add, add, addContainerListener, addImpl, countComponents, deliverEvent, doLayout, findComponentAt, findComponentAt, getAlignmentX, getAlignmentY, getComponent, getComponentAt, getComponentAt, getComponentCount, getComponents, getInsets, getLayout, getMaximumSize, insets, invalidate, isAncestorOf, layout, list, list, locate, minimumSize, paintComponents, paramString, preferredSize, print, printComponents, processContainerEvent, processEvent, remove, remove, removeAll, removeContainerListener, removeNotify, setCursor, setFont, setLayout, validate, validateTree

Methods inherited from class java.awt.Component

action, add, addComponentListener, addFocusListener, addInputMethodListener, addKeyListener, addMouseListener, addMouseMotionListener, addPropertyChangeListener, addPropertyChangeListener, bounds, checkImage, checkImage, coalesceEvents, contains, contains, createImage, createImage, disable, disableEvents, dispatchEvent, enable, enable, enableEvents, enableInputMethods, firePropertyChange, getBackground, getBounds, getBounds, getColorModel, getComponentOrientation, getCursor, getDropTarget, getFont, getFontMetrics, getForeground, getGraphics, getHeight, getInputContext, getInputMethodRequests, getLocale, getLocation, getLocation, getLocationOnScreen, getName, getParent, getPeer, getSize, getSize, getToolkit, getTreeLock, getWidth, getX, getY, gotFocus, handleEvent, hasFocus, hide, imageUpdate, inside, isDisplayable, isDoubleBuffered, isEnabled, isFocusTraversable, isLightweight, isOpaque, isShowing, isValid, isVisible, keyDown, keyUp, list, list, list, location, lostFocus, mouseDown, mouseDrag, mouseEnter, mouseExit, mouseMove, mouseUp, move, nextFocus, paintAll, postEvent, prepareImage, prepareImage, printAll, processComponentEvent, processFocusEvent, processInputMethodEvent, processKeyEvent, processMouseEvent, processMouseMotionEvent, remove, removeComponentListener, removeFocusListener, removeInputMethodListener, removeKeyListener, removeMouseListener, removeMouseMotionListener, removePropertyChangeListener, removePropertyChangeListener, repaint, repaint, repaint, repaint, requestFocus, reshape, resize, resize, setBounds, setComponentOrientation, setDropTarget, setEnabled, setLocale, setLocation, setLocation, setName, setSize, setVisible, show, show, size, toString, transferFocus

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

_yMax

protected transient double _yMax

_yMin

protected transient double _yMin

_xMax

protected transient double _xMax

_xMin

protected transient double _xMin

_PADDING

protected static final transient double _PADDING

_xRangeGiven

protected transient boolean _xRangeGiven

_yRangeGiven

protected transient boolean _yRangeGiven

_rangesGivenByZooming

protected transient boolean _rangesGivenByZooming

_xlowgiven

protected double _xlowgiven

_xhighgiven

protected double _xhighgiven

_ylowgiven

protected double _ylowgiven

_yhighgiven

protected double _yhighgiven

_xBottom

protected double _xBottom

_xTop

protected double _xTop

_yBottom

protected double _yBottom

_yTop

protected double _yTop

_xlog

protected boolean _xlog

_ylog

protected boolean _ylog

_LOG10SCALE

protected static final double _LOG10SCALE

_grid

protected boolean _grid

_wrap

protected boolean _wrap

_background

protected java.awt.Color _background

_foreground

protected java.awt.Color _foreground

_topPadding

protected int _topPadding

_bottomPadding

protected int _bottomPadding

_rightPadding

protected int _rightPadding

_leftPadding

protected int _leftPadding

_ulx

protected int _ulx

_uly

protected int _uly

_lrx

protected int _lrx

_lry

protected int _lry

_yscale

protected double _yscale

_xscale

protected double _xscale

_usecolor

protected boolean _usecolor

_colors

protected static java.awt.Color[] _colors

_width

protected int _width

_height

protected int _height

_documentBase

public java.net.URL _documentBase

Constructor Detail

PlotBox

public PlotBox()

Construct a plot box with a default configuration.

Method Detail

addLegend

public void addLegend(int dataset,
                      java.lang.String legend)

Add a legend (displayed at the upper right) for the specified data set with the specified string. Short strings generally fit better than long strings. If the string is empty, or the argument is null, then no legend is added.

Parameters:

dataset - The dataset index.

legend - The label for the dataset.

addXTick

public void addXTick(java.lang.String label,
                     double position)

Specify a tick mark for the X axis. The label given is placed on the axis at the position given by position. If this is called once or more, automatic generation of tick marks is disabled. The tick mark will appear only if it is within the X range.

Parameters:

label - The label for the tick mark.

position - The position on the X axis.

addYTick

public void addYTick(java.lang.String label,
                     double position)

Specify a tick mark for the Y axis. The label given is placed on the axis at the position given by position. If this is called once or more, automatic generation of tick marks is disabled. The tick mark will appear only if it is within the Y range.

Parameters:

label - The label for the tick mark.

position - The position on the Y axis.

clear

public void clear(boolean axes)

If the argument is true, clear the axes. I.e., set all parameters controlling the axes to their initial conditions. For the change to take effect, call repaint(). If the argument is false, do nothing.

Parameters:

axes - If true, clear the axes parameters.

export

public void export(java.io.OutputStream out)

Export a description of the plot. Currently, only EPS is supported. But in the future, this may cause a dialog box to open to allow the user to select a format. If the argument is null, then the description goes to the clipboard. Otherwise, it goes to the specified file. To send it to standard output, use System.out as an argument.

Parameters:

file - A file writer to which to send the description.

fillPlot

public void fillPlot()

Rescale so that the data that is currently plotted just fits. This is done based on the protected variables _xBottom, _xTop, _yBottom, and _yTop. It is up to derived classes to ensure that variables are valid. This method calls repaint(), which eventually causes the display to be updated.

getColor

public boolean getColor()

Return whether the plot uses color.

Returns:

True if the plot uses color.

getColorByName

public static java.awt.Color getColorByName(java.lang.String name)

Convert a color name into a Color. Currently, only a very limited set of color names is supported: black, white, red, green, and blue.

Parameters:

name - A color name, or null if not found.

Returns:

An instance of Color.

getDataurl

public java.lang.String getDataurl()

Deprecated.

Get the file specification that was given by setDataurl. This method is deprecated. Use read() instead.

getDocumentBase

public java.net.URL getDocumentBase()

Deprecated.

Get the document base that was set by setDocumentBase. This method is deprecated. Use read() instead.

getGrid

public boolean getGrid()

Return whether the grid is drawn.

Returns:

True if a grid is drawn.

getLegend

public java.lang.String getLegend(int dataset)

Get the legend for a dataset, or null if there is none. The legend would have been set by addLegend().

Parameters:

dataset - The dataset index.

Returns:

The legend label, or null if there is none.

getMinimumSize

public java.awt.Dimension getMinimumSize()

Get the minimum size of this component. This is simply the dimensions specified by setBounds() or setSize().

Overrides:

getMinimumSize in class java.awt.Container

Returns:

The minimum size.

getPreferredSize

public java.awt.Dimension getPreferredSize()

Get the preferred size of this component. This is simply the dimensions specified by setBounds() or setSize().

Overrides:

getPreferredSize in class java.awt.Container

Returns:

The preferred size.

getTitle

public java.lang.String getTitle()

Get the title of the graph, or an empty string if there is none.

Returns:

The title.

getXLabel

public java.lang.String getXLabel()

Get the label for the X (horizontal) axis, or null if none has been set.

Returns:

The X label.

getXLog

public boolean getXLog()

Return whether the X axis is drawn with a logarithmic scale.

Returns:

True if the X axis is logarithmic.

getXRange

public double[] getXRange()

Get the X range. The returned value is an array where the first element is the minimum and the second element is the maximum. return The current X range.

getXTicks

public java.util.Vector[] getXTicks()

Get the X ticks that have been specified, or null if none. The return value is an array with two vectors, the first of which specifies the X tick locations (as instances of Double), and the second of which specifies the corresponding labels.

Returns:

The X ticks.

getYLabel

public java.lang.String getYLabel()

Get the label for the Y (vertical) axis, or null if none has been set.

Returns:

The Y label.

getYLog

public boolean getYLog()

Return whether the Y axis is drawn with a logarithmic scale.

Returns:

True if the Y axis is logarithmic.

getYRange

public double[] getYRange()

Get the Y range. The returned value is an array where the first element is the minimum and the second element is the maximum. return The current Y range.

getYTicks

public java.util.Vector[] getYTicks()

Get the Y ticks that have been specified, or null if none. The return value is an array with two vectors, the first of which specifies the Y tick locations (as instances of Double), and the second of which specifies the corresponding labels.

Returns:

The Y ticks.

init

public void init()

Deprecated.

Initialize the component, creating the fill button and parsing an input file, if one has been specified. This is deprecated. Call setButtons() and read() instead.

paint

public void paint(java.awt.Graphics graphics)

Paint the component contents, which in this base class is only the axes.

Overrides:

paint in class java.awt.Container

Parameters:

graphics - The graphics context.

parseFile

public void parseFile(java.lang.String filespec)

Deprecated.

Syntactic sugar for parseFile(filespec, documentBase). This method is deprecated. Use read() to read the old file format, or use one of the classes in the plotml package to read the XML-based file format.

parseFile

public void parseFile(java.lang.String filespec,
                      java.net.URL documentBase)

Deprecated. This method is deprecated. Use read() instead.

Open up the input file, which could be stdin, a URL, or a file.

read

public void read(java.io.InputStream in)
          throws java.io.IOException

Read commands and/or plot data from an input stream in the old (non-XML) file syntax. To update the display, call repaint(), or make the plot visible with setVisible(true).

To read from standard input, use:

     read(System.in);
  

To read from a url, use:

     read(url.openStream());
  

To read a URL from within an applet, use:

     URL url = new URL(getDocumentBase(), urlSpec);
     read(url.openStream());
  

Within an application, if you have an absolute URL, use:

     URL url = new URL(urlSpec);
     read(url.openStream());
  

To read from a file, use:

     read(new FileInputStream(filename));
  

Parameters:

in - The input stream.

Throws:

java.io.IOException - If the stream cannot be read.

read

public void read(java.lang.String command)

Read a single line command provided as a string. The commands can be any of those in the ASCII file format.

Parameters:

command - A command.

samplePlot

public void samplePlot()

Do nothing in this base class. Derived classes might want to override this class to give an example of their use.

setBackground

public void setBackground(java.awt.Color background)

Set the background color.

Overrides:

setBackground in class java.awt.Component

Parameters:

background - The background color.

setBounds

public void setBounds(int x,
                      int y,
                      int width,
                      int height)

Move and resize this component. The new location of the top-left corner is specified by x and y, and the new size is specified by width and height. This overrides the base class method to make a record of the new size.

Overrides:

setBounds in class java.awt.Component

Parameters:

x - The new x-coordinate of this component.

y - The new y-coordinate of this component.

width - The new width of this component.

height - The new height of this component.

setButtons

public void setButtons(boolean visible)

If the argument is true, make a fill button visible at the upper right. This button auto-scales the plot. NOTE: The button may infringe on the title space, if the title is long. In an application, it is preferable to provide a menu with the fill command. This way, when printing the plot, the printed plot will not have a spurious button. Thus, this method should be used only by applets, which normally do not have menus.

setColor

public void setColor(boolean useColor)

If the argument is false, draw the plot without using color (in black and white). Otherwise, draw it in color (the default).

Parameters:

useColor - False to draw in back and white.

setDataurl

public void setDataurl(java.lang.String filespec)

Deprecated.

Set the file to read when init() is called. This method is deprecated. Use read() instead.

setDocumentBase

public void setDocumentBase(java.net.URL documentBase)

Deprecated.

Set the document base to used when init() is called to read a URL. This method is deprecated. Use read() instead.

setForeground

public void setForeground(java.awt.Color foreground)

Set the foreground color.

Overrides:

setForeground in class java.awt.Component

Parameters:

foreground - The foreground color.

setGrid

public void setGrid(boolean grid)

Control whether the grid is drawn.

Parameters:

grid - If true, a grid is drawn.

setLabelFont

public void setLabelFont(java.lang.String name)

Set the label font, which is used for axis labels and legend labels. The font names understood are those understood by java.awt.Font.decode().

Parameters:

name - A font name.

setSize

public void setSize(int width,
                    int height)

Set the size of the plot.

Overrides:

setSize in class java.awt.Component

Parameters:

width - The width, in pixels.

height - The height, in pixels.

setTitle

public void setTitle(java.lang.String title)

Set the title of the graph.

Parameters:

title - The title.

setTitleFont

public void setTitleFont(java.lang.String name)

Set the title font. The font names understood are those understood by java.awt.Font.decode().

Parameters:

name - A font name.

setWrap

public void setWrap(boolean wrap)

Control whether the X axis is wrapped. If it is, then X values that are out of range are remapped to be in range using modulo arithmetic.

Parameters:

wrap - If true, wrapping of the X axis is enabled.

setXLabel

public void setXLabel(java.lang.String label)

Set the label for the X (horizontal) axis.

Parameters:

label - The label.

setXLog

public void setXLog(boolean xlog)

Specify whether the X axis is drawn with a logarithmic scale.

Parameters:

xlog - If true, logarithmic axis is used.

setXRange

public void setXRange(double min,
                      double max)

Set the X (horizontal) range of the plot. If this is not done explicitly, then the range is computed automatically from data available when the plot is drawn. If min and max are identical, then the range is arbitrarily spread by 1.

Parameters:

min - The left extent of the range.

max - The right extent of the range.

setYLabel

public void setYLabel(java.lang.String label)

Set the label for the Y (vertical) axis.

Parameters:

label - The label.

setYLog

public void setYLog(boolean ylog)

Specify whether the Y axis is drawn with a logarithmic scale.

Parameters:

ylog - If true, logarithmic axis is used.

setYRange

public void setYRange(double min,
                      double max)

Set the Y (vertical) range of the plot. If this is not done explicitly, then the range is computed automatically from data available when the plot is drawn. If min and max are identical, then the range is arbitrarily spread by 0.1.

Parameters:

min - The bottom extent of the range.

max - The top extent of the range.

update

public void update(java.awt.Graphics g)

Override update so that it doesn't clear the plot. This prevents flashing of dynamic plots. Note that this means that calls to update are not passed to lightweight components. But currently we have no lightweight components, so this is not a problem.

Overrides:

update in class java.awt.Container

write

public void write(java.io.OutputStream out)

Write the current data and plot configuration to the specified stream in PlotML syntax. PlotML is an XML extension for plot data. The written information is standalone, in that it includes the DTD (document type definition). This makes is somewhat verbose. To get smaller files, use the two argument version of write(). The output is buffered, and is flushed and closed before exiting. Derived classes should override _write() rather than this method.

Parameters:

out - An output stream.

write

public void write(java.io.OutputStream out,
                  java.lang.String dtd)

Write the current data and plot configuration to the specified stream in PlotML syntax. PlotML is an XML extension for plot data. The written information is not standalone, in that it refers to an external DTD (document type definition). The URL (relative or absolute) for the DTD is given as the second argument. If that argument is null, then standalone file is written, which includes the DTD. The output is buffered, and is flushed and closed before exiting. Derived classes should override _write() rather than this method.

Parameters:

out - An output stream.

dtd - The reference (URL) for the DTD.

writeOldSyntax

public void writeOldSyntax(java.io.OutputStream out)

Deprecated.

Write the current data and plot configuration to the specified stream in the old PtPlot syntax. The output is buffered, and is flushed and closed before exiting. Derived classes should override _writeOldSyntax() rather than this method.

Parameters:

out - An output stream.

zoom

public void zoom(double lowx,
                 double lowy,
                 double highx,
                 double highy)

Zoom in or out to the specified rectangle. This method calls repaint().

Parameters:

lowx - The low end of the new X range.

lowy - The low end of the new Y range.

highx - The high end of the new X range.

highy - The high end of the new Y range.

_drawPlot

protected void _drawPlot(java.awt.Graphics graphics,
                         boolean clearfirst)

Draw the axes using the current range, label, and title information. If the second argument is true, clear the display before redrawing. This method is called by paint(). To cause it to be called you would normally call repaint(), which eventually causes paint() to be called.

Parameters:

graphics - The graphics context.

clearfirst - If true, clear the plot before proceeding.

_drawPoint

protected void _drawPoint(java.awt.Graphics graphics,
                          int dataset,
                          long xpos,
                          long ypos,
                          boolean clip)

Put a mark corresponding to the specified dataset at the specified x and y position. The mark is drawn in the current color. In this base class, a point is a filled rectangle 6 pixels across. Note that marks greater than about 6 pixels in size will not look very good since they will overlap axis labels and may not fit well in the legend. The clip argument, if true, states that the point should not be drawn if it is out of range.

Parameters:

graphics - The graphics context.

dataset - The index of the data set.

xpos - The X position.

ypos - The Y position.

clip - If true, do not draw if out of range.

_help

protected void _help()

Display basic information in its own window.

_parseLine

protected boolean _parseLine(java.lang.String line)

Parse a line that gives plotting information. In this base class, only lines pertaining to the title and labels are processed. Everything else is ignored. Return true if the line is recognized.

Parameters:

line - A line of text.

_setButtonsVisibility

protected void _setButtonsVisibility(boolean vis)

Deprecated.

Set the visibility of the Fill button. This is deprecated. Use setButtons().

_write

protected void _write(java.io.PrintWriter output)

Write plot information to the specified output stream in PlotML. Derived classes should override this method to first call the parent class method, then add whatever additional information they wish to add to the stream.

Parameters:

output - A buffered print writer.

_writeOldSyntax

protected void _writeOldSyntax(java.io.PrintWriter output)

Deprecated.

Write plot information to the specified output stream in the old PtPlot syntax. Derived classes should override this method to first call the parent class method, then add whatever additional information they wish to add to the stream.

Parameters:

output - A buffered print writer.