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Learning Perl/Tk
book

Learning Perl/Tk

by Nancy Walsh
January 1999
Beginner content levelBeginner
373 pages
9h 43m
English
O'Reilly Media, Inc.
Content preview from Learning Perl/Tk

16.10. Screen Information

The following methods all return information based on the screen (which can be a virtual desktop or a normal desktop) and the colors of the desktop.

16.10.1. Screen Name

Each screen you use has a name associated with it. To get the name, use the screen method:

$name = $widget->screen();

The name returned will be formatted as "displayName.screenIndex". My Windows 95 machine returned ":0.0" as the screen name.

16.10.2. Screen Height and Width

The screen height and width is really just the resolution of the screen. Sometimes you might need information to determine how large a window can fit on a user's display. To get the height and width of the screen in pixels, use the screenheight and screenwidthmethods:

$height = $widget->screenheight();
$width = $widget->screenwidth();

If my resolution is 768x1024, then screenheight returns 768 and screenwidth returns 1024. If you prefer to get the size of the screen in millimeters, then use screenmmheight and screenmmwidth:

$heightmm = $widget->screenmmheight();
$widthmm = $widget->screenmmwidth();

The same resolution, 768x1024, returns 203 millimeters as the height and 270 millimeters as the width for my monitor.

16.10.3. Cell Count

The number of cells in the default colormap is retrieved by using screencells:

$count = $widget->screencells();

My Windows 95 machine has 64 cells in its default colormap.

16.10.4. Screen Depth

To determine the number of bits per pixel your screen has, use the screendepth method: ...

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Publisher Resources

ISBN: 1565923146Supplemental ContentCatalog PageErrata