Bitmap(3) User Contributed Perl Documentation Bitmap(3)NAMETk::Bitmap - Images that display two colors
SYNOPSIS
$image = $widget->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
Bitmaps are created using $widget->Bitmap. Bitmaps support the follow‐
ing 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 bitmap, ignoring any -mask‐
data 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 speci‐
fied, the -data option takes precedence.
-file => name
name gives the name of a file whose contents define the source bit‐
map. 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 bitmap format (e.g., as generated by the bitmap pro‐
gram). 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 METHODS
When a bitmap image is created, Tk also creates a new object. This
object supports the configure and cget methods described in Tk::options
which can be used to enquire and modify the options described above.
SEE ALSO
Tk::Image Tk::Pixmap Tk::Photo
KEYWORDS
bitmap, image
perl v5.8.8 2004-02-28 Bitmap(3)
