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NAME
dtscreen - the Common Desktop Environment animated screen
savers
SYNOPSIS
dtscreen [ -display dsp ] [ -delay usecs ]
[ -batchcount num ] [ -saturation value ]
[ -nice nicelevel ] [ -mode mode ]
[ -create ] [ -resources ] [ -help ]
DESCRIPTION
The dtscreen client supports the following key tasks.
- Draws an animated image on a provided window id(s).
- Does not assume the size of the provided window(s).
- Provides a set of selectable animated images.
- Animation parameters such as nice, speed, number and
saturation may be specified.
The dtscreen client provides the default screen saver anima-
tions for the desktop. When launched, it will query the
desktop using the API for the set for window ids on which to
draw. These window ids could be the cover windows created by
the session manager for session lock, or a window imbedded
in the style manager's session lock customization dialog.
Once obtained, the dtscreen client will proceed to draw in
these windows using the specified options. If dtscreen can-
not obtain the set of window ids or if it is given the
-create option, it will create its own. Normally, the
dtscreen client will be invoked directly by the session
manager, or by the style manager.
Note that the Session Manager, dtsession, is responsible for
locking the session and prompting for a password to unlock.
The session manager may launch the dtscreen client to pro-
vide screen saver animations during session lock. Refer to
the session manager specification for resources controlling
the launching of screen savers by the session manager.
The style manager may launch the dtscreen client to provide
a preview of a screen saver animation during customization.
Refer to the style manager specification for information on
how to integrate a screen saver client such as dtscreen into
the desktop.
The dtsession client provides a selectable set of anima-
tions. These are:
hop Hopalong iterated fractals.
life Conway's game of life.
qix Spinning lines.
image Random bouncing image.
swarm Swarm of bees.
rotor Rotor
pyro Fireworks.
flame Cosmic Flame Fractals.
worm Wiggly Worms.
random Random mode.
The dtscreen client animations are based on xlock(1).
OPTIONS
-display dsp
The display on which animations will be drawn.
-delay usecs
The delay option sets the speed at which a mode will
operate. It simply sets the number of microseconds to
delay between batches of "hopalong pixels", "qix
lines", "life generations", "image blits", and "swarm
motions".
-batchcount num
The batchcount option sets the number of things to do
per batch to num. In qix mode this refers to the number
of lines rendered in the same color. In hop mode this
refers to the number of pixels rendered in the same
color. In image mode this refers to the number of X
logos on the screen at once. in swarm mode this refers
to the number of bees. In life mode it means nothing.
-saturation value
The saturation option sets the saturation of the color
ramp used to value. 0 is grayscale, 1 is very rich
color and 0.4 is a nice pastel.
-nice nicelevel
The nice option sets the system nicelevel of the
dtscreen process to nicelevel.
-create
The create option ensures dtscreen will create it's own
window even if window ids are provided.
-help
The help option displays a one-line description for
each option and a list of supported animation modes.
-resources
The resources option prints the default values of the
main resources for customising dtscreen.
-mode mode
The mode option specifies which animation should be
displayed. Values are:
hop Hopalong iterated fractals.
life Conway's game of life.
qix Spinning lines.
image Random bouncing image.
swarm Swarm of bees.
rotor Rotor
pyro Fireworks.
flame Cosmic Flame Fractals.
worm Wiggly Worms.
random Random mode.
RETURN VALUE
Exit values are:
0 Successful completion.
>0 Error condition occurred.
EXAMPLES
dtscreen -mode swarm
Display the swarm animation.
RESOURCES
center; cf3 cf3 cf3 cf3 l l l l . Name ClassClass Type
Default _ mode Mode String swarm nice Nice Int 16
delay Delay Int 1000
batchcount Batchcount Int 100
saturation Saturation Float 1.0
hop.delay Delay Int 0
hop.batchcount Batchcount Int 1000
hop.saturation Saturation Float 1
image.delay Delay Int 2000000
image.batchcount Batchcount Int 8
image.saturation Saturation Float 0.2
qix.delay Delay Int 30000
qix.batchcount Batchcount Int 64
qix.saturation Saturation Float 1
life.delay Delay Int 1000000
life.batchcount Batchcount Int 1
life.saturation Saturation Float 1
swarm.delay Delay Int 10000
swarm.batchcount Batchcount Int 100
swarm.saturation Saturation Float 1
rotor.delay Delay Int 10000
rotor.batchcount Batchcount Int 4
rotor.saturation Saturation Float 0.4
pyro.delay Delay Int 15000
pyro.batchcount Batchcount Int 40
pyro.saturation Saturation Float 1.0
flame.delay Delay Int 10000
flame.batchcount Batchcount Int 20
flame.saturation Saturation Float 1.0
worm.delay Delay Int 10000
worm.batchcount Batchcount Int 20
worm.saturation Saturation Float 1.0
delay
The delay option sets the speed at which a mode will
operate. It simply sets the number of microseconds to delay
between batches of "hopalong pixels", "qix lines", "life
generations", "image blits", and "swarm motions".
batchcount
The batchcount option sets the number of things to do per
batch to num. In qix mode this refers to the number of lines
rendered in the same color. In hop mode this refers to the
number of pixels rendered in the same color. In image mode
this refers to the number of X logos on the screen at once.
in swarm mode this refers to the number of bees. In life
mode it means nothing.
saturation
The saturation option sets the saturation of the color ramp
used to value. 0 is grayscale, 1 is very rich color and 0.4
is a nice pastel.
nice
The nice option sets the system nicelevel of the dtscreen
process to nicelevel.
mode
The mode option specifies which animation should be
displayed. Values are:
hop Hopalong iterated fractals.
life Conway's game of life.
qix Spinning lines.
image Random bouncing image.
swarm Swarm of bees.
rotor Rotor
pyro Fireworks.
flame Cosmic Flame Fractals.
worm Wiggly Worms.
random Random mode.
SEE ALSO
dtsession Launches the dtscreen client during session
lock. Provides resources that can be used to
control this event. Locks and unlocks a ses-
sion.
dtstyle Launched the dtscreen client during session
lock customization. Provides the methods by
which additional screen saver clients may be
integrated into the desktop.
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