eps

graph(BLT 2.4)                                                  graph(BLT 2.4)



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NAME
       eps -  Encapsulated PostScript canvas item.

SYNOPSIS
       canvas create eps x y ?option value?...
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DESCRIPTION
       The eps canvas item lets you place encapulated PostScript (EPS) on a
       canvas, controlling its size and placement.  The EPS item is displayed
       either as a solid rectangle or a preview image.  The preview image is
       designated in one of two ways: 1) the EPS file contains an ASCII
       hexidecimal preview, or 2) a Tk photo image.  When the canvas generates
       PostScript output, the EPS will be inserted with the proper translation
       and scaling to match that of the EPS item. So can use the canvas widget
       as a page layout tool.

EXAMPLE
       Let's say you have for PostScript files of four graphs which you want
       to tile two-by-two on a single page.  Maybe you'd like to annotate the
       graphs by putting a caption at the bottom of each graph.

       Normally, you would have to resort to an external tool or write your
       own PostScript program.  The eps canvas item lets you do this through
       Tk's canvas widget.  An eps item displays an image (or rectangle)
       representing the encapsulated PostScript file.  It also scales and
       translates the EPS file when the canvas is printed.


SYNTAX
       canvas create eps x y ?option value?...  The eps item creates a new
       canvas item. Canvas is the name of a canvas widget.  You must supply
       the X-Y coordinate of the new eps item.  How the coordinate is exactly
       interpretered is controlled by the -anchor option (see below).

       Additional options may be specified on the command line to configure
       aspects of the eps item such as its color, stipple, and font.  The
       following option and value pairs are valid.

       -anchor anchor
              Tells how to position the EPS item relative to its X-Y
              coordinate.  The default is center.

       -background color
              Sets the background color of the EPS rectangle.

       -borderwidth pixels
              Sets the width of the 3-D border around the outside edge of the
              item.  The -relief option determines if the border is to be
              drawn.  The default is 0.

       -file fileName
              Specifies the name of the EPS file.  The first line of an EPS
              file must start with "%!PS" and contain a "EPS" version
              specification.  The other requirement is that there be a
              "%%BoundingBox:" entry which contains four integers representing
              the lower-left and upper-right coordinates of the area bounding
              the EPS.  The default is "".

       -font fontName
              Specifies the font of the title. The default is *-Helvetica-
              Bold-R-Normal-*-18-180-*.

       -foreground color
              Specifies the foreground color of the EPS rectangle.  The option
              matters only when the -stipple option is set.  The default is
              white.

       -height pixels
              Specifies the height EPS item.  If pixels is 0, then the height
              is determined from the PostScript "BoundingBox:" entry in the
              EPS file.  The default is 0.

       -image photo
              Specifies the name of a Tk photo image to be displayed as in the
              item as a preview image.  This option overrides any preview
              specification found in the EPS file.  The default is "".

       -justify justify
              Specifies how the title should be justified.  This matters only
              when the title contains more than one line of text. Justify must
              be left, right, or center.  The default is center.

       -relief relief
              Specifies the 3-D effect for the EPS item.  Relief specifies how
              the item should appear relative to canvas; for example, raised
              means the item should appear to protrude.  The default is flat.

       -shadowcolor color
              Specifies the color of the drop shadow used for the title.  The
              option with the -shadowoffset option control how the title's
              drop shadow appears.  The default is grey.

       -shadowoffset pixels
              Specifies the offset of the drop shadow from the title's text.
              If pixels is 0, no shadow will be seen.  The default is 0.

       -showimage boolean
              Indicates whether to display the image preview (if one exists),
              or a simple rectangle.  The default is yes.

       -stipple bitmap
              Specifies a bitmap to used to stipple the rectangle representing
              the EPS item.  The default is "".

       -title string
              Sets the title of the EPS item.  If string is "", then the title
              specified by the PostScript "Title:" entry is used.  You can set
              the string a single space to display no title.  The default is
              "".

       -titleanchor anchor
              Tells how to position the title within EPS item.  The default is
              n.

       -titlecolor color
              Specifies the color of the title.  The default is white.

       -titlerotate degrees
              Sets the rotation of the title.  Degrees is a real number
              representing the angle of rotation.  The title is first rotated
              in space and then placed according to the -titleanchor position.
              The default rotation is 0.0.

       -width pixels
              Specifies the width EPS item.  If pixels is 0, then the width is
              determined from the PostScript "BoundingBox:" entry in the EPS
              file.  The default is 0.  5i.

EXAMPLE
       The graph command creates a new graph.  # Create a new graph.  Plotting
       area is black.  graph .g -plotbackground black A new Tcl command .g is
       also created.  This command can be used to query and modify the graph.
       For example, to change the title of the graph to "My Plot", you use the
       new command and the graph's configure operation.  # Change the title.
       .g configure -title "My Plot" A graph has several components. To access
       a particular component you use the component's name. For example, to
       add data elements, you use the new command and the element component.
       # Create a new element named "line1" .g element create line1 \
            -xdata { 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 } \      -ydata {
       26.18 50.46 72.85 93.31 111.86 128.47 143.14           155.85 166.60
       175.38 } The element's X and Y coordinates are specified using lists of
       numbers.  Alternately, BLT vectors could be used to hold the X-Y
       coordinates.  # Create two vectors and add them to the graph.  vector
       xVec yVec xVec set { 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 } yVec set
       { 26.18 50.46 72.85 93.31 111.86 128.47 143.14 155.85      166.60
       175.38 } .g element create line1 -xdata xVec -ydata yVec The advantage
       of using vectors is that when you modify one, the graph is
       automatically redrawn to display the new values.  # Change the X-Y
       coordinates of the first point.  set xVec(0) 0.18 set yVec(0) 25.18 An
       element named line1 is now created in .g.  By default, the element's
       label in the legend will be also line1.  You can change the label, or
       specify no legend entry, again using the element's configure operation.
       # Don't display "line1" in the legend.  .g element configure line1
       -label "" You can configure more than just the element's label.  An
       element has many attributes such as symbol type and size, dashed or
       solid lines, colors, line width, etc.  .g element configure line1
       -symbol square -color red \      -dashes { 2 4 2 } -linewidth 2 -pixels
       2c Four coordinate axes are automatically created: x, x2, y, and y2.
       And by default, elements are mapped onto the axes x and y.  This can be
       changed with the -mapx and -mapy options.  # Map "line1" on the
       alternate Y-axis "y2".  .g element configure line1 -mapy y2 Axes can be
       configured in many ways too.  For example, you change the scale of the
       Y-axis from linear to log using the axis component.  # Y-axis is log
       scale.  .g axis configure y -logscale yes One important way axes are
       used is to zoom in on a particular data region.  Zooming is done by
       simply specifying new axis limits using the -min and -max configuration
       options.  .g axis configure x -min 1.0 -max 1.5 .g axis configure y
       -min 12.0 -max 55.15 To zoom interactively, you link the axis configure
       operations with some user interaction (such as pressing the mouse
       button), using the bind command.  To convert between screen and graph
       coordinates, use the invtransform operation.  # Click the button to set
       a new minimum bind .g <ButtonPress-1> {
           %W axis configure x -min [%W axis invtransform x %x]
           %W axis configure x -min [%W axis invtransform x %y] } By default,
       the limits of the axis are determined from data values.  To reset back
       to the default limits, set the -min and -max options to the empty
       value.  # Reset the axes to autoscale again.  .g axis configure x -min
       {} -max {} .g axis configure y -min {} -max {} By default, the legend
       is drawn in the right margin.  You can change this or any legend
       configuration options using the legend component.  # Configure the
       legend font, color, and relief .g legend configure -position left
       -relief raised \      -font fixed -fg blue To prevent the legend from
       being displayed, turn on the -hide option.  # Don't display the legend.
       .g legend configure -hide yes The graph widget has simple drawing
       procedures called markers.  They can be used to highlight or annotate
       data in the graph. The types of markers available are bitmaps, images,
       polygons, lines, or windows.  Markers can be used, for example, to mark
       or brush points.  In this example, is a text marker that labels the
       data first point.  Markers are created using the marker component.  #
       Create a label for the first data point of "line1".  .g marker create
       text -name first_marker -coords { 0.2 26.18 } \      -text "start"
       -anchor se -xoffset -10 -yoffset -10 This creates a text marker named
       first_marker.  It will display the text "start" near the coordinates of
       the first data point.  The -anchor, -xoffset, and -yoffset options are
       used to display the marker above and to the left of the data point, so
       that the data point isn't covered by the marker.  By default, markers
       are drawn last, on top of data.  You can change this with the -under
       option.  # Draw the label before elements are drawn.  .g marker
       configure first_marker -under yes You can add cross hairs or grid lines
       using the crosshairs and grid components.  # Display both cross hairs
       and grid lines.  .g crosshairs configure -hide no -color red .g grid
       configure -hide no -dashes { 2 2 } Finally, to get hardcopy of the
       graph, use the postscript component.  # Print the graph into file
       "file.ps" .g postscript output file.ps -maxpect yes -decorations no
       This generates a file file.ps containing the encapsulated PostScript of
       the graph.  The option -maxpect says to scale the plot to the size of
       the page.  Turning off the -decorations option denotes that no borders
       or color backgrounds should be drawn (i.e. the background of the
       margins, legend, and plotting area will be white).

GRAPH OPERATIONS
       pathName axis operation ?arg?...
              See the AXIS COMPONENTS section.

       pathName bar elemName ?option value?...
              Creates a new barchart element elemName.  It's an error if an
              element elemName already exists.  See the manual for barchart
              for details about what option and value pairs are valid.

       pathName cget option
              Returns the current value of the configuration option given by
              option.  Option may be any option described below for the
              configure operation.

       pathName configure ?option value?...
              Queries or modifies the configuration options of the graph.  If
              option isn't specified, a list describing the current options
              for pathName is returned.  If option is specified, but not
              value, then a list describing option is returned.  If one or
              more option and value pairs are specified, then for each pair,
              the option option is set to value.  The following options are
              valid.

              -background color
                     Sets the background color. This includes the margins and
                     legend, but not the plotting area.

              -borderwidth pixels
                     Sets the width of the 3-D border around the outside edge
                     of the widget.  The -relief option determines if the
                     border is to be drawn.  The default is 2.

              -bottommargin pixels
                     Specifies the size of the margin below the X-coordinate
                     axis.  If pixels is 0, the size of the margin is selected
                     automatically.  The default is 0.

              -bufferelements boolean
                     Indicates whether an internal pixmap to buffer the
                     display of data elements should be used.  If boolean is
                     true, data elements are drawn to an internal pixmap.
                     This option is especially useful when the graph is
                     redrawn frequently while the remains data unchanged (for
                     example, moving a marker across the plot).  See the SPEED
                     TIPS section.  The default is 1.

              -cursor cursor
                     Specifies the widget's cursor.  The default cursor is
                     crosshair.

              -font fontName
                     Specifies the font of the graph title. The default is
                     *-Helvetica-Bold-R-Normal-*-18-180-*.

              -halo pixels
                     Specifies a maximum distance to consider when searching
                     for the closest data point (see the element's closest
                     operation below).  Data points further than pixels away
                     are ignored.  The default is 0.5i.

              -height pixels
                     Specifies the requested height of widget.  The default is
                     4i.

              -invertxy boolean
                     Indicates whether the placement X-axis and Y-axis should
                     be inverted.  If boolean is true, the X and Y axes are
                     swapped.  The default is 0.

              -justify justify
                     Specifies how the title should be justified.  This
                     matters only when the title contains more than one line
                     of text. Justify must be left, right, or center.  The
                     default is center.

              -leftmargin pixels
                     Sets the size of the margin from the left edge of the
                     window to the Y-coordinate axis.  If pixels is 0, the
                     size is calculated automatically.  The default is 0.

              -plotbackground color
                     Specifies the background color of the plotting area.  The
                     default is white.

              -plotborderwidth pixels
                     Sets the width of the 3-D border around the plotting
                     area.  The -plotrelief option determines if a border is
                     drawn.  The default is 2.

              -plotpadx pad
                     Sets the amount of padding to be added to the left and
                     right sides of the plotting area.  Pad can be a list of
                     one or two screen distances.  If pad has two elements,
                     the left side of the plotting area entry is padded by the
                     first distance and the right side by the second.  If pad
                     is just one distance, both the left and right sides are
                     padded evenly.  The default is 8.

              -plotpady pad
                     Sets the amount of padding to be added to the top and
                     bottom of the plotting area.  Pad can be a list of one or
                     two screen distances.  If pad has two elements, the top
                     of the plotting area is padded by the first distance and
                     the bottom by the second.  If pad is just one distance,
                     both the top and bottom are padded evenly.  The default
                     is 8.

              -plotrelief relief
                     Specifies the 3-D effect for the plotting area.  Relief
                     specifies how the interior of the plotting area should
                     appear relative to rest of the graph; for example, raised
                     means the plot should appear to protrude from the graph,
                     relative to the surface of the graph.  The default is
                     sunken.

              -relief relief
                     Specifies the 3-D effect for the graph widget.  Relief
                     specifies how the graph should appear relative to widget
                     it is packed into; for example, raised means the graph
                     should appear to protrude.  The default is flat.

              -rightmargin pixels
                     Sets the size of margin from the plotting area to the
                     right edge of the window.  By default, the legend is
                     drawn in this margin.  If pixels is than 1, the margin
                     size is selected automatically.

              -takefocus focus
                     Provides information used when moving the focus from
                     window to window via keyboard traversal (e.g., Tab and
                     Shift-Tab).  If focus is 0, this means that this window
                     should be skipped entirely during keyboard traversal.  1
                     means that the this window should always receive the
                     input focus.  An empty value means that the traversal
                     scripts make the decision whether to focus on the window.
                     The default is "".

              -tile image
                     Specifies a tiled background for the widget.  If image
                     isn't "", the background is tiled using image.
                     Otherwise, the normal background color is drawn (see the
                     -background option).  Image must be an image created
                     using the Tk image command.  The default is "".

              -title text
                     Sets the title to text. If text is "", no title will be
                     displayed.

              -topmargin pixels
                     Specifies the size of the margin above the x2 axis.  If
                     pixels is 0, the margin size is calculated automatically.

              -width pixels
                     Specifies the requested width of the widget.  The default
                     is 5i.

       pathName crosshairs operation ?arg?
              See the CROSSHAIRS COMPONENT section.

       pathName element operation ?arg?...
              See the ELEMENT COMPONENTS section.

       pathName extents item
              Reports the size of a particular items in the graph.  Item must
              be either leftmargin, rightmargin, topmargin, bottommargin,
              plotwidth, or plotheight.

       pathName grid operation ?arg?...
              See the GRID COMPONENT section.

       pathName invtransform winX winY
              Performs an inverse coordinate transformation, mapping window
              coordinates back to graph coordinates, using the standard X-axis
              and Y-axis.  Returns a list of containing the X-Y y graph
              coordinates.

       pathName inside x y
              Returns 1 is the designated screen coordinate (x and y) is
              inside the plotting area and 0 otherwise.

       pathName legend operation ?arg?...
              See the LEGEND COMPONENT section.

       pathName line operation arg...
              The operation is the same as element.

       pathName marker operation ?arg?...
              See the MARKER COMPONENTS section.

       pathName postscript operation ?arg?...
              See the POSTSCRIPT COMPONENT section.

       pathName snap photoName
              Takes a snapshot of the graph and stores the contents in the
              photo image photoName.  PhotoName is the name of a Tk photo
              image that must already exist.

       pathName transform x y
              Performs a coordinate transformation, mapping graph coordinates
              to window coordinates, using the standard X-axis and Y-axis.
              Returns a list containing the X-Y screen coordinates.

       pathName xaxis operation ?arg?...

       pathName x2axis operation ?arg?...

       pathName yaxis operation ?arg?...

       pathName y2axis operation ?arg?...
              See the AXIS COMPONENTS section.

GRAPH COMPONENTS
       A graph is composed of several components: coordinate axes, data
       elements, legend, grid, cross hairs, postscript, and annotation
       markers. Instead of one big set of configuration options and
       operations, the graph is partitioned, where each component has its own
       configuration options and operations that specifically control that
       aspect or part of the graph.

   AXIS COMPONENTS
       Four coordinate axes are automatically created: two X-coordinate axes
       (x and x2) and two Y-coordinate axes (y, and y2).  By default, the axis
       x is located in the bottom margin, y in the left margin, x2 in the top
       margin, and y2 in the right margin.

       An axis consists of the axis line, title, major and minor ticks, and
       tick labels.  Major ticks are drawn at uniform intervals along the
       axis.  Each tick is labeled with its coordinate value.  Minor ticks are
       drawn at uniform intervals within major ticks.

       The range of the axis controls what region of data is plotted.  Data
       points outside the minimum and maximum limits of the axis are not
       plotted.  By default, the minimum and maximum limits are determined
       from the data, but you can reset either limit.

       You can create and use several axes. To create an axis, invoke the axis
       component and its create operation.  # Create a new axis called
       "tempAxis" .g axis create tempAxis You map data elements to an axis
       using the element's -mapy and -mapx configuration options. They specify
       the coordinate axes an element is mapped onto.  # Now map the tempAxis
       data to this axis.  .g element create "e1" -xdata $x -ydata $y -mapy
       tempAxis While you can create many axes, only four can be displayed
       simultaneously. They are drawn in each of the margins surrounding the
       plotting area.  The axes x and y are drawn in the bottom and left
       margins. The axes x2 and y2 are drawn in top and right margins.  Only x
       and y are shown by default. Note that the axes can have different
       scales.

       To display a different axis, you invoke one of the following
       components: xaxis, yaxis, x2axis, and y2axis.  The use operation
       designates the axis to be drawn in the corresponding margin: xaxis in
       the bottom, yaxis in the left, x2axis in the top, and y2axis in the
       right.  # Display the axis tempAxis in the left margin.  .g yaxis use
       tempAxis

       You can configure axes in many ways. The axis scale can be linear or
       logarithmic.  The values along the axis can either monotonically
       increase or decrease.  If you need custom tick labels, you can specify
       a Tcl procedure to format the label any way you wish.  You can control
       how ticks are drawn, by changing the major tick interval or the number
       of minor ticks.  You can define non-uniform tick intervals, such as for
       time-series plots.

       pathName axis cget axisName option
              Returns the current value of the option given by option for
              axisName.  Option may be any option described below for the axis
              configure operation.

       pathName axis configure axisName ?axisName?... ?option value?...
              Queries or modifies the configuration options of axisName.
              Several axes can be changed.  If option isn't specified, a list
              describing all the current options for axisName is returned.  If
              option is specified, but not value, then a list describing
              option is returned.  If one or more option and value pairs are
              specified, then for each pair, the axis option option is set to
              value.  The following options are valid for axes.

              -color color
                     Sets the color of the axis and tick labels.  The default
                     is black.

              -command prefix
                     Specifies a Tcl command to be invoked when formatting the
                     axis tick labels. Prefix is a string containing the name
                     of a Tcl proc and any extra arguments for the procedure.
                     This command is invoked for each major tick on the axis.
                     Two additional arguments are passed to the procedure: the
                     pathname of the widget and the current the numeric value
                     of the tick.  The procedure returns the formatted tick
                     label.  If "" is returned, no label will appear next to
                     the tick.  You can get the standard tick labels again by
                     setting prefix to "".  The default is "".

                     Please note that this procedure is invoked while the
                     graph is redrawn.  You may query configuration options.
                     But do not them, because this can have unexpected
                     results.

              -descending boolean
                     Indicates whether the values along the axis are
                     monotonically increasing or decreasing.  If boolean is
                     true, the axis values will be decreasing.  The default is
                     0.

              -hide boolean
                     Indicates whether the axis is displayed.

              -justify justify
                     Specifies how the axis title should be justified.  This
                     matters only when the axis title contains more than one
                     line of text. Justify must be left, right, or center.
                     The default is center.

              -limits formatStr
                     Specifies a printf-like description to format the minimum
                     and maximum limits of the axis.  The limits are displayed
                     at the top/bottom or left/right sides of the plotting
                     area.  FormatStr is a list of one or two format
                     descriptions.  If one description is supplied, both the
                     minimum and maximum limits are formatted in the same way.
                     If two, the first designates the format for the minimum
                     limit, the second for the maximum.  If "" is given as
                     either description, then the that limit will not be
                     displayed.  The default is "".

              -linewidth pixels
                     Sets the width of the axis and tick lines.  The default
                     is 1 pixel.

              -logscale boolean
                     Indicates whether the scale of the axis is logarithmic or
                     linear.  If boolean is true, the axis is logarithmic.
                     The default scale is linear.

              -loose boolean
                     Indicates whether the limits of the axis should fit the
                     data points tightly, at the outermost data points, or
                     loosely, at the outer tick intervals.  This is relevant
                     only when the axis limit is automatically calculated.  If
                     boolean is true, the axis range is "loose".  The default
                     is 0.

              -majorticks majorList
                     Specifies where to display major axis ticks.  You can use
                     this option to display ticks at non-uniform intervals.
                     MajorList is a list of axis coordinates designating the
                     location of major ticks.  No minor ticks are drawn.  If
                     majorList is "", major ticks will be automatically
                     computed. The default is "".

              -max value
                     Sets the maximum limit of axisName.  Any data point
                     greater than value is not displayed.  If value is "", the
                     maximum limit is calculated using the largest data value.
                     The default is "".

              -min value
                     Sets the minimum limit of axisName. Any data point less
                     than value is not displayed.  If value is "", the minimum
                     limit is calculated using the smallest data value.  The
                     default is "".

              -minorticks minorList
                     Specifies where to display minor axis ticks.  You can use
                     this option to display minor ticks at non-uniform
                     intervals. MinorList is a list of real values, ranging
                     from 0.0 to 1.0, designating the placement of a minor
                     tick.  No minor ticks are drawn if the -majortick option
                     is also set.  If minorList is "", minor ticks will be
                     automatically computed. The default is "".

              -rotate theta
                     Specifies the how many degrees to rotate the axis tick
                     labels.  Theta is a real value representing the number of
                     degrees to rotate the tick labels.  The default is 0.0
                     degrees.

              -showticks boolean
                     Indicates whether axis ticks should be drawn. If boolean
                     is true, ticks are drawn.  If false, only the axis line
                     is drawn. The default is 1.

              -stepsize value
                     Specifies the interval between major axis ticks.  If
                     value isn't a valid interval (must be less than the axis
                     range), the request is ignored and the step size is
                     automatically calculated.

              -subdivisions number
                     Indicates how many minor axis ticks are to be drawn.  For
                     example, if number is two, only one minor tick is drawn.
                     If number is one, no minor ticks are displayed.  The
                     default is 2.

              -tickfont fontName
                     Specifies the font for axis tick labels. The default is
                     *-Courier-Bold-R-Normal-*-100-*.

              -ticklength pixels
                     Sets the length of major and minor ticks (minor ticks are
                     half the length of major ticks). If pixels is less than
                     zero, the axis will be inverted with ticks drawn pointing
                     towards the plot.  The default is 0.1i.

              -title text
                     Sets the title of the axis. If text is "", no axis title
                     will be displayed.

              -titlecolor color
                     Sets the color of the axis title. The default is black.

              -titlefont fontName
                     Specifies the font for axis title. The default is
                     *-Helvetica-Bold-R-Normal-*-14-140-*.

              Axis configuration options may be also be set by the option
              command.  The resource class is Axis.  The resource names are
              the names of the axes (such as x or x2).  option add
              *Graph.Axis.Color  blue option add *Graph.x.LogScale  true
              option add *Graph.x2.LogScale false

       pathName axis create axisName ?option value?...
              Creates a new axis by the name axisName.  No axis by the same
              name can already exist. Option and value are described in above
              in the axis configure operation.

       pathName axis delete ?axisName?...
              Deletes the named axes. An axis is not really deleted until it
              is not longer in use, so it's safe to delete axes mapped to
              elements.

       pathName axis invtransform axisName value
              Performs the inverse transformation, changing the screen
              coordinate value to a graph coordinate, mapping the value mapped
              to axisName.  Returns the graph coordinate.

       pathName axis limits axisName
              Returns a list of the minimum and maximum limits for axisName.
              The order of the list is min max.

       pathName axis names ?pattern?...
              Returns a list of axes matching zero or more patterns.  If no
              pattern argument is give, the names of all axes are returned.

       pathName axis transform axisName value
              Transforms the coordinate value to a screen coordinate by
              mapping the it to axisName.  Returns the transformed screen
              coordinate.

       Only four axes can be displayed simultaneously.  By default, they are
       x, y, x2, and y2.  You can swap in a different axis with use operation
       of the special axis components: xaxis, x2axis, yaxis, and y2axis.  .g
       create axis temp .g create axis time ...  .g xaxis use temp .g yaxis
       use time Only the axes specified for use are displayed on the screen.

       The xaxis, x2axis, yaxis, and y2axis components operate on an axis
       location rather than a specific axis like the more general axis
       component does.  The xaxis component manages the X-axis located in the
       bottom margin (whatever axis that happens to be).  Likewise, yaxis uses
       the Y-axis in the left margin, x2axis the top X-axis, and y2axis the
       right Y-axis.

       They implicitly control the axis that is currently using to that
       location.  By default, xaxis uses the x axis, yaxis uses y, x2axis uses
       x2, and y2axis uses y2.  These components can be more convenient to use
       than always determining what axes are current being displayed by the
       graph.

       The following operations are available for axes. They mirror exactly
       the operations of the axis component.  The axis argument must be xaxis,
       x2axis, yaxis, or y2axis.

       pathName axis cget option

       pathName axis configure ?option value?...

       pathName axis invtransform value

       pathName axis limits

       pathName axis transform value

       pathName axis use ?axisName?
              Designates the axis axisName is to be displayed at this
              location.  AxisName can not be already in use at another
              location.  This command returns the name of the axis currently
              using this location.

   CROSSHAIRS COMPONENT
       Cross hairs consist of two intersecting lines (one vertical and one
       horizontal) drawn completely across the plotting area.  They are used
       to position the mouse in relation to the coordinate axes.  Cross hairs
       differ from line markers in that they are implemented using XOR drawing
       primitives.  This means that they can be quickly drawn and erased
       without redrawing the entire graph.

       The following operations are available for cross hairs:

       pathName crosshairs cget option
              Returns the current value of the cross hairs configuration
              option given by option.  Option may be any option described
              below for the cross hairs configure operation.

       pathName crosshairs configure ?option value?...
              Queries or modifies the configuration options of the cross
              hairs.  If option isn't specified, a list describing all the
              current options for the cross hairs is returned.  If option is
              specified, but not value, then a list describing option is
              returned.  If one or more option and value pairs are specified,
              then for each pair, the cross hairs option option is set to
              value.  The following options are available for cross hairs.

              -color color
                     Sets the color of the cross hairs.  The default is black.

              -dashes dashList
                     Sets the dash style of the cross hairs. DashList is a
                     list of up to 11 numbers that alternately represent the
                     lengths of the dashes and gaps on the cross hair lines.
                     Each number must be between 1 and 255.  If dashList is
                     "", the cross hairs will be solid lines.

              -hide boolean
                     Indicates whether cross hairs are drawn. If boolean is
                     true, cross hairs are not drawn.  The default is yes.

              -linewidth pixels
                     Set the width of the cross hair lines.  The default is 1.

              -position pos
                     Specifies the screen position where the cross hairs
                     intersect.  Pos must be in the form "@x,y", where x and y
                     are the window coordinates of the intersection.

              Cross hairs configuration options may be also be set by the
              option command.  The resource name and class are crosshairs and
              Crosshairs respectively.  option add *Graph.Crosshairs.LineWidth
              2 option add *Graph.Crosshairs.Color     red

       pathName crosshairs off
              Turns off the cross hairs.

       pathName crosshairs on
              Turns on the display of the cross hairs.

       pathName crosshairs toggle
              Toggles the current state of the cross hairs, alternately
              mapping and unmapping the cross hairs.

   ELEMENT COMPONENTS
       A data element represents a set of data.  It contains x and y vectors
       containing the coordinates of the data points.  Elements can be
       displayed with a symbol at each data point and lines connecting the
       points.  Elements also control the appearance of the data, such as the
       symbol type, line width, color etc.

       When new data elements are created, they are automatically added to a
       list of displayed elements.   The display list controls what elements
       are drawn and in what order.

       The following operations are available for elements.

       pathName element activate elemName ?index?...
              Specifies the data points of element elemName to be drawn using
              active foreground and background colors.  ElemName is the name
              of the element and index is a number representing the index of
              the data point. If no indices are present then all data points
              become active.

       pathName element cget elemName option
              Returns the current value of the element configuration option
              given by option.  Option may be any of the options described
              below for the element configure operation.

       pathName element closest x y varName ?option value?... ?elemName?...
              Finds the data point closest to the window coordinates x and y
              in the element elemName.  ElemName is the name of an element,
              that must not be hidden.  If no elements are specified, then all
              visible elements are searched.  It returns via the array
              variable varName the name of the closest element, the index of
              its closest point, and the graph coordinates of the point.
              Returns 0, if no data point within the threshold distance can be
              found, otherwise 1 is returned.  The following option-value
              pairs are available.

              -halo pixels
                     Specifies a threshold distance where selected data points
                     are ignored.  Pixels is a valid screen distance, such as
                     2 or 1.2i.  If this option isn't specified, then it
                     defaults to the value of the graph's -halo option.

              -interpolate boolean
                     Indicates that both the data points and interpolated
                     points along the line segment formed should be
                     considered.  If boolean is true, the closest line segment
                     will be selected instead of the closest point. If this
                     option isn't specified, boolean defaults to 0.

       pathName element configure elemName ?elemName... ?option value?...
              Queries or modifies the configuration options for elements.
              Several elements can be modified at the same time. If option
              isn't specified, a list describing all the current options for
              elemName is returned.  If option is specified, but not value,
              then a list describing the option option is returned.  If one or
              more option and value pairs are specified, then for each pair,
              the element option option is set to value.  The following
              options are valid for elements.

              -activepen penName
                     Specifies pen to use to draw active element.  If penName
                     is "", no active elements will be drawn.  The default is
                     activeLine.

              -color color
                     Sets the color of the traces connecting the data points.

              -dashes dashList
                     Sets the dash style of element line. DashList is a list
                     of up to 11 numbers that alternately represent the
                     lengths of the dashes and gaps on the element line.  Each
                     number must be between 1 and 255.  If dashList is "", the
                     lines will be solid.

              -data coordList
                     Specifies the X-Y coordinates of the data.  CoordList is
                     a list of numeric expressions representing the X-Y
                     coordinate pairs of each data point.

              -fill color
                     Sets the interior color of symbols.  If color is "", then
                     the interior of the symbol is transparent.  If color is
                     defcolor, then the color will be the same as the -color
                     option.  The default is defcolor.

              -hide boolean
                     Indicates whether the element is displayed.  The default
                     is no.

              -label text
                     Sets the element's label in the legend.  If text is "",
                     the element will have no entry in the legend.  The
                     default label is the element's name.

              -linewidth pixels
                     Sets the width of the connecting lines between data
                     points.  If pixels is 0, no connecting lines will be
                     drawn between symbols.  The default is 0.

              -mapx xAxis
                     Selects the X-axis to map the element's X-coordinates
                     onto.  XAxis must be the name of an axis.  The default is
                     x.

              -mapy yAxis
                     Selects the Y-axis to map the element's Y-coordinates
                     onto.  YAxis must be the name of an axis. The default is
                     y.

              -offdash color
                     Sets the color of the stripes when traces are dashed (see
                     the -dashes option).  If color is "", then the "off"
                     pixels will represent gaps instead of stripes.  If color
                     is defcolor, then the color will be the same as the
                     -color option.  The default is defcolor.

              -outline color
                     Sets the color or the outline around each symbol.  If
                     color is "", then no outline is drawn. If color is
                     defcolor, then the color will be the same as the -color
                     option.  The default is defcolor.

              -outlinewidth pixels
                     Sets the width of the outline bordering each symbol.  If
                     pixels is 0, no outline will be drawn. The default is 1.

              -pixels pixels
                     Sets the size of symbols.  If pixels is 0, no symbols
                     will be drawn.  The default is 0.125i.

              -scalesymbols boolean
                     If boolean is true, the size of the symbols drawn for
                     elemName will change with scale of the X-axis and Y-axis.
                     At the time this option is set, the current ranges of the
                     axes are saved as the normalized scales (i.e scale factor
                     is 1.0) and the element is drawn at its designated size
                     (see the -pixels option).  As the scale of the axes
                     change, the symbol will be scaled according to the
                     smaller of the X-axis and Y-axis scales.  If boolean is
                     false, the element's symbols are drawn at the designated
                     size, regardless of axis scales.  The default is 0.

              -smooth smooth
                     Specifies how connecting line segments are drawn between
                     data points.  Smooth can be either linear, step, natural,
                     or quadratic.  If smooth is linear, a single line segment
                     is drawn, connecting both data points. When smooth is
                     step, two line segments are drawn. The first is a
                     horizontal line segment that steps the next X-coordinate.
                     The second is a vertical line, moving to the next
                     Y-coordinate.  Both natural and quadratic generate
                     multiple segments between data points.  If natural, the
                     segments are generated using a cubic spline.  If
                     quadratic, a quadratic spline is used.  The default is
                     linear.

              -styles styleList
                     Specifies what pen to use based on the range of weights
                     given.  StyleList is a list of style specifications. Each
                     style specification, in turn, is a list consisting of a
                     pen name, and optionally a minimum and maximum range.
                     Data points whose weight (see the -weight option) falls
                     in this range, are drawn with this pen.  If no range is
                     specified it defaults to the index of the pen in the
                     list.  Note that this affects only symbol attributes.
                     Line attributes, such as line width, dashes, etc. are
                     ignored.

              -symbol symbol
                     Specifies the symbol for data points.  Symbol can be
                     either square, circle, diamond, plus, cross, splus,
                     scross, triangle, "" (where no symbol is drawn), or a
                     bitmap.  Bitmaps are specified as "source ?mask?", where
                     source is the name of the bitmap, and mask is the
                     bitmap's optional mask.  The default is circle.

              -trace direction
                     Indicates whether connecting lines between data points
                     (whose X-coordinate values are either increasing or
                     decreasing) are drawn.  Direction must be increasing,
                     decreasing, or both.  For example, if direction is
                     increasing, connecting lines will be drawn only between
                     those data points where X-coordinate values are
                     monotonically increasing.  If direction is both,
                     connecting lines will be draw between all data points.
                     The default is both.

              -weights wVec
                     Specifies the weights of the individual data points.
                     This, with the list pen styles (see the -styles option),
                     controls how data points are drawn.  WVec is the name of
                     a BLT vector or a list of numeric expressions
                     representing the weights for each data point.

              -xdata xVec
                     Specifies the X-coordinates of the data.  XVec is the
                     name of a BLT vector or a list of numeric expressions.

              -ydata yVec
                     Specifies the Y-coordinates of the data.  YVec is the
                     name of a BLT vector or a list of numeric expressions.

              Element configuration options may also be set by the option
              command.  The resource class is Element. The resource name is
              the name of the element.  option add *Graph.Element.symbol line
              option add *Graph.e1.symbol line

       pathName element create elemName ?option value?...
              Creates a new element elemName.  It's an error is an element
              elemName already exists.  If additional arguments are present,
              they specify options valid for the element configure operation.

       pathName element deactivate elemName ?elemName?...
              Deactivates all the elements matching pattern.  Elements whose
              names match any of the patterns given are redrawn using their
              normal colors.

       pathName element delete ?elemName?...
              Deletes all the named elements.  The graph is automatically
              redrawn.

       pathName element exists elemName
              Returns 1 if an element elemName currently exists and 0
              otherwise.

       pathName element names ?pattern?...
              Returns the elements matching one or more pattern.  If no
              pattern is given, the names of all elements is returned.

       pathName element show ?nameList?
              Queries or modifies the element display list.  The element
              display list designates the elements drawn and in what order.
              NameList is a list of elements to be displayed in the order they
              are named.  If there is no nameList argument, the current
              display list is returned.

       pathName element type elemName
              Returns the type of elemName.  If the element is a bar element,
              the commands returns the string "bar", otherwise it returns
              "line".

   GRID COMPONENT
       Grid lines extend from the major and minor ticks of each axis
       horizontally or vertically across the plotting area.  The following
       operations are available for grid lines.

       pathName grid cget option
              Returns the current value of the grid line configuration option
              given by option.  Option may be any option described below for
              the grid configure operation.

       pathName grid configure ?option value?...
              Queries or modifies the configuration options for grid lines.
              If option isn't specified, a list describing all the current
              grid options for pathName is returned.  If option is specified,
              but not value, then a list describing option is returned.  If
              one or more option and value pairs are specified, then for each
              pair, the grid line option option is set to value.  The
              following options are valid for grid lines.

              -color color
                     Sets the color of the grid lines.  The default is black.

              -dashes dashList
                     Sets the dash style of the grid lines. DashList is a list
                     of up to 11 numbers that alternately represent the
                     lengths of the dashes and gaps on the grid lines.  Each
                     number must be between 1 and 255.  If dashList is "", the
                     grid will be solid lines.

              -hide boolean
                     Indicates whether the grid should be drawn. If boolean is
                     true, grid lines are not shown. The default is yes.

              -linewidth pixels
                     Sets the width of grid lines.  The default width is 1.

              -mapx xAxis
                     Specifies the X-axis to display grid lines.  XAxis must
                     be the name of an axis.  The default is x.

              -mapy yAxis
                     Specifies the Y-axis to display grid lines.  YAxis must
                     be the name of an axis. The default is y.

              -minor boolean
                     Indicates whether the grid lines should be drawn for
                     minor ticks.  If boolean is true, the lines will appear
                     at minor tick intervals.  The default is 1.

SPEED TIPS
       There may be cases where the graph needs to be drawn and updated as
       quickly as possible.  If drawing speed becomes a big problem, here are
       a few tips to speed up displays.

       · Try to minimize the number of data points.  The more data points the
         looked at, the more work the graph must do.

       · If your data is generated as floating point values, the time required
         to convert the data values to and from ASCII strings can be
         significant, especially when there any many data points.  You can
         avoid the redundant string-to-decimal conversions using the C API to
         BLT vectors.

       · Data elements without symbols are drawn faster than with symbols.
         Set the data element's -symbol option to none.  If you need to draw
         symbols, try using the simple symbols such as splus and scross.

       · Don't stipple or dash the element.  Solid lines are much faster.

       · If you update data elements frequently, try turning off the widget's
         -bufferelements option.  When the graph is first displayed, it draws
         data elements into an internal pixmap.  The pixmap acts as a cache,
         so that when the graph needs to be redrawn again, and the data
         elements or coordinate axes haven't changed, the pixmap is simply
         copied to the screen.  This is especially useful when you are using
         markers to highlight points and regions on the graph.  But if the
         graph is updated frequently, changing either the element data or
         coordinate axes, the buffering becomes redundant.

LIMITATIONS
       Auto-scale routines do not use requested min/max limits as boundaries
       when the axis is logarithmically scaled.

       The PostScript output generated for polygons with more than 1500 points
       may exceed the limits of some printers (See PostScript Language
       Reference Manual, page 568).  The work-around is to break the polygon
       into separate pieces.

FUTURE INCOMPATIBILITY
       The -mapped options are obsoleted and will be removed.  You can achieve
       the same results using the -hide option instead.  # Works for now.  .g
       legend configure -mapped no

       # Instead use this.  .g legend configure -hide yes

KEYWORDS
       graph, widget



                                                                graph(BLT 2.4)