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- # Copyright (c) 1994 The Regents of the University of California.
- # Copyright (c) 1994-1996 Sun Microsystems, Inc.
- # See the file "license.terms" for information on usage and redistribution
- # of this file, and for a DISCLAIMER OF ALL WARRANTIES.
- #
- #
-
- =head1 NAME
-
- Tk::Image - Create and manipulate images
-
- =for category Tk Image Classes
-
- =head1 SYNOPSIS
-
- I<$image> = I<$widget>-E<gt>I<type>(?I<arg arg ...>?)
-
- I<$image>-E<gt>I<method>(?I<arg arg ...>?)
-
- =head1 DESCRIPTION
-
- The B<image> constructors and methods are used to create, delete, and query images.
- It can take several different forms, depending on the
- I<type>.
-
- The constructors require a I<$widget> to invoke them, this is used
- to locate a B<MainWindow>. (This is because the underlying Tk code
- registers the images in the data structure for the B<MainWindow>.)
-
- The legal forms are:
-
- =over 4
-
- =item I<$widget>-E<gt>I<type>?(?I<name>?,?I<option>=E<gt>I<value ...>)?
-
- Creates a new image and returns an object.
- I<type> specifies the type of the image, which must be one of
- the types currently defined (e.g., B<Bitmap>).
- I<name> specifies the name for the image; if it is omitted then
- Tk picks a name of the form B<image>I<x>, where I<x> is
- an integer.
- There may be any number of I<option>=E<gt>I<value> pairs,
- which provide configuration options for the new image.
- The legal set of options is defined separately for each image
- type; see below for details on the options for built-in image types.
- If an image already exists by the given name then it is replaced
- with the new image and any instances of that image will redisplay
- with the new contents.
-
- =item I<$image>-E<gt>B<delete>
-
- Deletes the image I<$image> and returns an empty string.
- If there are instances of the image displayed in widgets,
- the image won't actually be deleted until all of the instances
- are released.
- However, the association between the instances and the image
- manager will be dropped.
- Existing instances will retain their sizes but redisplay as
- empty areas.
- If a deleted image is recreated (with the same I<name>)
- the existing instances will use the new image.
-
- =item I<$image>-E<gt>B<height>
-
- Returns a decimal string giving the height of image I<name>
- in pixels.
-
- =item I<$widget>-E<gt>B<imageInuse>( 'name' );
-
- Returns a boolean value indicating whether or not the image
- given by I<name> is in use by any widgets.
-
- =item I<$widget>-E<gt>B<imageNames>
-
- Returns a list containing all existing images for I<$widget>'s
- B<MainWindow>.
-
- =item I<$image>-E<gt>B<type>
-
- Returns the type of I<$image> (the value of the I<type>
- method when the image was created).
-
- =item I<$widget>-E<gt>B<imageTypes>
-
- Returns a list whose elements are all of the valid image types
- (i.e., all of the values that may be supplied for the I<type>
- to create an image).
-
- =item I<$image>-E<gt>B<width>
-
- Returns a decimal string giving the width of image I<name>
- in pixels.
-
- =back
-
- =head1 BUILT-IN IMAGE TYPES
-
- The following image types are defined by Tk so they will be available
- in any Tk application.
- Individual applications or extensions may define additional types.
-
- =over 4
-
- =item B<Bitmap>
-
- Each pixel in the image displays a foreground color, a background
- color, or nothing.
- See L<Tk::Bitmap> for more information.
-
- =item B<Pixmap>
-
- B<Pixmap> is slightly more general than B<Bitmap>, each pixel can
- be any available color or "transparent" (rendered as background color of the
- widget image is displayed in). B<Pixmap> is best used for icons and other
- simple graphics with only a few colors.
-
- B<Pixmap> is derived from Tix. See L<Tk::Pixmap> for more information.
-
- =item B<Photo>
-
- Displays a variety of full-color images, using dithering to
- approximate colors on displays with limited color capabilities.
- See L<Tk::Photo> documentation for more information.
-
- =back
-
- =head1 SEE ALSO
-
- L<Tk::Bitmap|Tk::Bitmap>
- L<Tk::Pixmap|Tk::Pixmap>
- L<Tk::Photo|Tk::Photo>
-
- =head1 KEYWORDS
-
- height, image, types of images, width
-
- =cut
-
-