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bitmap(n) Tk Built-In Commands bitmap(n)
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NAME
bitmap - Images that display two colors
SYNOPSIS
image create bitmap ?name? ?options?
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DESCRIPTION
A bitmap is an image whose pixels can display either of two colors or be transparent. A
bitmap image is defined by four things: a background color, a foreground color, and two
bitmaps, called the source and the mask. Each of the bitmaps specifies 0/1 values for a
rectangular array of pixels, and the two bitmaps must have the same dimensions. For pix-
els where the mask is zero, the image displays nothing, producing a transparent effect.
For other pixels, the image displays the foreground color if the source data is one and
the background color if the source data is zero.
CREATING BITMAPS
Like all images, bitmaps are created using the image create command. Bitmaps support the
following options:
-background color
Specifies a background color for the image in any of the standard ways accepted by
Tk. If this option is set to an empty string then the background pixels will be
transparent. This effect is achieved by using the source bitmap as the mask bit-
map, ignoring any -maskdata or -maskfile options.
-data string
Specifies the contents of the source bitmap as a string. The string must adhere to
X11 bitmap format (e.g., as generated by the bitmap program). If both the -data
and -file options are specified, the -data option takes precedence.
-file name
name gives the name of a file whose contents define the source bitmap. The file
must adhere to X11 bitmap format (e.g., as generated by the bitmap program).
-foreground color
Specifies a foreground color for the image in any of the standard ways accepted by
Tk.
-maskdata string
Specifies the contents of the mask as a string. The string must adhere to X11 bit-
map format (e.g., as generated by the bitmap program). If both the -maskdata and
-maskfile options are specified, the -maskdata option takes precedence.
-maskfile name
name gives the name of a file whose contents define the mask. The file must adhere
to X11 bitmap format (e.g., as generated by the bitmap program).
IMAGE COMMAND
When a bitmap image is created, Tk also creates a new command whose name is the same as
the image. This command may be used to invoke various operations on the image. It has
the following general form:
imageName option ?arg arg ...?
Option and the args determine the exact behavior of the command. The following commands
are possible for bitmap images:
imageName cget option
Returns the current value of the configuration option given by option. Option may
have any of the values accepted by the image create bitmap command.
imageName configure ?option? ?value option value ...?
Query or modify the configuration options for the image. If no option is speci-
fied, returns a list describing all of the available options for imageName (see
Tk_ConfigureInfo for information on the format of this list). If option is speci-
fied with no value, then the command returns a list describing the one named option
(this list will be identical to the corresponding sublist of the value returned if
no option is specified). If one or more option-value pairs are specified, then the
command modifies the given option(s) to have the given value(s); in this case the
command returns an empty string. Option may have any of the values accepted by the
image create bitmap command.
KEYWORDS
bitmap, image
Tk 4.0 bitmap(n)
Generated by $Id: phpMan.php,v 4.55 2007/09/05 04:42:51 chedong Exp $ Author: Che Dong
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