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PGPLOT(3)		       User Contributed Perl Documentation			PGPLOT(3)

	 PDL::Graphics::PGPLOT - PGPLOT enhanced interface for PDL

	perldl> $a = pdl [1..100]
	perldl> $b = sqrt($a)
	perldl> line $b
	perldl> hold
	Graphics on HOLD
	perldl> $c = sin($a/10)*2 + 4
	perldl> line $c

       "PDL::Graphics::PGPLOT" is a convenience interface to the PGPLOT commands, implemented
       using the object oriented PGPLOT plotting package in PDL::Graphics::PGPLOT::Window. See
       the documentation for that package for in-depth information about the usage of these com-
       mands and the options they accept.

       The list of currently availably commands:

	imag	   -  Display an image (uses pgimag()/pggray() as appropriate)
	im	   -  Shorthand to display an image with aspect ratio of 1
	fits_imag  -  Display a FITS image with appropriate transforms & labels
	ctab	   -  Load an image colour table
	ctab_info  -  Get information about currently loaded colour table
	line	   -  Plot vector as connected points
	points	   -  Plot vector as points
	errb	   -  Plot error bars
	cont	   -  Display image as contour map
	bin	   -  Plot vector as histogram (e.g. bin(hist($data)) )
	hi2d	   -  Plot image as 2d histogram (not very good IMHO...)
	poly	   -  Draw a polygon
	vect	   -  Display 2 images as a vector field
	text	   -  Write text in the plot area
	label_axes -  Print axis titles
	legend	   -  Create a legend with different texts, linestyles etc.
	cursor	   -  Interactively read cursor positions.
	circle	   -  Draw a circle
	ellipse    -  Draw an ellipse.

       Device manipulation commands:

	hold	     -	Hold current plot window range - allows overlays etc.
	release      -	Release back to autoscaling of new plot window for each
	rel	     -	short alias for 'release'
	env	     -	Define a plot window, put on 'hold'
	dev	     -	Explicitly set a new PGPLOT graphics device
	new_window   -	Create a new plot window (use of dev is recommended)
	focus_window -	Change focus to a new window
	window_list  -	Get a list of currently exisiting plot windows
	close_window -	Close an open window

       The following is a list of the functions that are private to this package, for the other
       functions please read the PDL::Graphics::PGPLOT::Window documentation.


       Open PGPLOT graphics device

	Usage: dev $device, [$nx,$ny, $opt];

       $device is a PGPLOT graphics device such as "/xserve" or "/ps", if omitted defaults to
       last used device (or value of env var "PGPLOT_DEV" if first time).  $nx, $ny specify
       sub-panelling. The function returns the id of the newly created window - this can subse-
       quently be used as argument to "focus_window" to select the window.

       The result of this command can be modified using options. The options recognised are the
       same as for "new_window" - which primarily and in addition it is possible to set the
       default values for a window that are defined in PDL::PGPLOTOptions, see this for details
       but see below for a synopsis.

       In addition "dev" recognises the option "NewWindow" which allows the user to specify that
       a "dev" command is to create a new window rather than closing the previous. This allows a
       large number of output destinations to be open at the same time, which occasionally can be

       Here is a quick summary of the most useful additional options that can be given:

	   Alternative to $device.

	   The aspect ratio of the output window

	   The width of the plot window in inches

	   The axis colour to be used as default for plots in this window. In the same way it is
	   possible to set the default character size ("CharSize") and axis and box styles. See
	   PDL::Graphics::PGPLOTOptions for details.

	   The name of a window. This name can subsequently be used to refer to the window
	   instead of its ID, making interactive use somewhat more intuitive.

       To open a X-window output that will stay on screen:

	 $win = dev('/xs');

       To open two windows, one small and square, one large and wide:

	 $win1 = dev('/xs', {Aspect => 1, WindowWidth => 4});
	 $win2 = dev('/xs', {Aspect => 0.5, WindowWidth => 10});


       Open a PGPLOT graphics device

	 $win = new_window($dev, $nx, $ny, $opt);

       This function is identical to dev except that it always creates a new window. This means
       that the user is required to close all windows explicitly using close_window. All func-
       tionality is otherwise like "dev" so see the documentation for dev for details of use.


       Close a PGPLOT output device

	Usage: close_window($id)

       This function closes a PGPLOT output device created with "dev" or "new_window". It
       requires the id of the window to close. If $id is left undefined, the currently focussed
       window is deleted and focus is transferred to the lowest numbered window in existence. If
       many windows have been created and deleted this might not be what you expect, so it is
       recommended to make an explicit call to focus_window after any call to "close_window".


       Internal function to obtain the ID of a window. This allows the user to refer to a window
       with its name.


       Switch to another output window.

	Usage: focus_window($id);

       This command is used to switch output focus to another window created by dev or new_win-
       dow. The window can be referred to either by its ID or by its name.

	 $win1 = dev('/xs', {WindowName => 'X-output'});
	 $win2 = dev('test.ps/ps', {WindowName => 'PS-output'});

	 focus_window('X-output');  # Or focus_window($win1);
	 <.. Commands ..>
	 focus_window($win2);	    # Or focus_window('PS-output');
	 <.. Commands ..>


       Return a list of ID numbers and names of the windows currently opened using dev or

	Usage: ($numbers, $names)=window_list();

       $numbers and $names are anonymous arrays giving the ID numbers and names of the open win-
       dows respectively.

perl v5.8.0				    2002-06-20					PGPLOT(3)
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