bitmap man page on DigitalUNIX

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bitmap(n)		     Tk Built-In Commands		     bitmap(n)

______________________________________________________________________________

NAME
       bitmap - Images that display two colors

SYNOPSIS
       image create bitmap ?name? ?options?
_________________________________________________________________

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	 back‐
       ground  color,  a  foreground color, and two bitmaps, called the source
       and the mask.  Each of the bitmaps specifies 0/1 values for a rectangu‐
       lar array of pixels, and the two bitmaps must have the same dimensions.
       For pixels where the mask is zero, the image displays nothing,  produc‐
       ing  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	 stan‐
	      dard  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 stan‐
	      dard ways accepted by Tk.

       -maskdata string
	      Specifies the contents of the mask as a string.  The string must
	      adhere  to  X11  bitmap format (e.g., as generated by the bitmap
	      program).	 If both the -maskdata and -maskfile options are spec‐
	      ified, 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 var‐
       ious 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 specified, returns a list describing all of the avail‐
	      able options for imageName (see Tk_ConfigureInfo for information
	      on  the  format  of  this list).	If option is specified 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)
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