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'\" -*- nroff -*-

'\"
'\" 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.

'\" 
'\" RCS: @(#) $Id: bitmap.n,v 1.3 2008/06/30 22:57:02 dkf Exp $

'\" 
.so man.macros
.TH bitmap n 4.0 Tk "Tk Built-In Commands"
.BS
'\" Note:  do not modify the .SH NAME line immediately below!

.SH NAME

bitmap \- Images that display two colors

.SH SYNOPSIS

\fBimage create bitmap \fR?\fIname\fR? ?\fIoptions\fR?

.BE

.SH DESCRIPTION

.PP

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 \fIsource\fR

and the \fImask\fR.

Each of the bitmaps specifies 0/1 values for a rectangular

array of pixels, and the two bitmaps must have the same

dimensions.

For pixels 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.

.SH "CREATING BITMAPS"

.PP

Like all images, bitmaps are created using the \fBimage create\fR

command.

Bitmaps support the following \fIoptions\fR:

.TP

\fB\-background \fIcolor\fR

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 bitmap, ignoring

any \fB\-maskdata\fR or \fB\-maskfile\fR options.

.TP

\fB\-data \fIstring\fR

Specifies the contents of the source bitmap as a string.

The string must adhere to X11 bitmap format (e.g., as generated

by the \fBbitmap\fR program).

If both the \fB\-data\fR and \fB\-file\fR options are specified,

the \fB\-data\fR option takes precedence.

.TP

\fB\-file \fIname\fR

\fIname\fR 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 \fBbitmap\fR program).

.TP

\fB\-foreground \fIcolor\fR

Specifies a foreground color for the image in any of the standard

ways accepted by Tk.

.TP

\fB\-maskdata \fIstring\fR

Specifies the contents of the mask as a string.

The string must adhere to X11 bitmap format (e.g., as generated

by the \fBbitmap\fR program).

If both the \fB\-maskdata\fR and \fB\-maskfile\fR options are specified,

the \fB\-maskdata\fR option takes precedence.

.TP

\fB\-maskfile \fIname\fR

\fIname\fR 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 \fBbitmap\fR program).

.SH "IMAGE COMMAND"

.PP

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:

.CS

\fIimageName option \fR?\fIarg arg ...\fR?

.CE

\fIOption\fR and the \fIarg\fRs

determine the exact behavior of the command.  The following

commands are possible for bitmap images:

.TP

\fIimageName \fBcget\fR \fIoption\fR

Returns the current value of the configuration option given

by \fIoption\fR.

\fIOption\fR may have any of the values accepted by the

\fBimage create bitmap\fR command.

.TP

\fIimageName \fBconfigure\fR ?\fIoption\fR? ?\fIvalue option value ...\fR?

Query or modify the configuration options for the image.

If no \fIoption\fR is specified, returns a list describing all of

the available options for \fIimageName\fR (see \fBTk_ConfigureInfo\fR for

information on the format of this list).  If \fIoption\fR is specified

with no \fIvalue\fR, 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 \fIoption\fR is specified).  If

one or more \fIoption\-value\fR 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.

\fIOption\fR may have any of the values accepted by the

\fBimage create bitmap\fR command.

.SH KEYWORDS

bitmap, image