Perl/Tk Pocket Reference

78 Perl/Tk Pocket Reference

$image->write(pathName ?, -option => value ... ?);

Writes image data from image into file pathName.

-format => format-name

Specifies image format for the file.

-from => x1, y1, x2, y2

Specifies a rectangular region of the image to copy

from.

13. Window Information

$widget->atom(name);

Returns integer identifier for atom given by name on

$widget’s display.

$widget->atomname(id);

Returns textual name of atom given by integer id on

$widget’s display.

$widget->cells;

Returns number of cells in the colormap for

$widget.

$widget->children;

Returns a list containing widget references of all the chil-

dren of

$widget.

$widget->class;

Returns the class name of

$widget.

$widget->colormapfull;

Returns 1 if the colormap for

$widget is full, 0 otherwise.

$widget->containing(rootX, rootY);

Returns the widget reference of window containing the

point rootX rootY on

$widget’s display.

$widget->depth;

Returns the depth (bits per pixel) of

$widget.

Exists(

$widget);

Returns 1 if there exists a window for $widget, ‘ ’ (false) if

no such window exists.

13. Window Information 79

$widget->fpixels(number);

Returns floating-point value giving the number of pixels

in

$widget corresponding to the distance given by

number.

$widget->geometry;

Returns the pixel geometry for

$widget, in the form

widthxheight+x+y.

$widget->height;

Returns ...