optacon(1X)optacon(1X)NAME
optacon - An X program for the Optacon II
SYNOPSIS
optacon [options]
OPTIONS
Specifying the -dev option instructs the optacon utility to use the next argument as the file for the Optacon II device. By default, the
device is /dev/tty00. Specifying the -interval option instructs the optacon utility to use the next argument as the interval for the Opta-
con II device. The interval specifies how often (in milliseconds) the optacon utility will update the display of the Optacon II. By
default, the interval is 10 milliseconds.
DESCRIPTION
The Optacon II, a product of TeleSensory Corporation, is an optical-to-tactile conversion device meant to assist the blind in accessing
visual information. The optacon utility was made specifically to allow blind users to use an Optacon II to have more access to an X Window
System display. The optacon utility does so by mapping the pixels surrounding the on-screen pointer to the pins on the Optacon II. All
black pixels will cause the associated Optacon II pins to vibrate, and all other pixels will cause the associated Optacon II pins to remain
still.
X DEFAULTS INFORMATION
The format for a resource specification for the optacon utility is:
*resource:value
Specifies the resource. Specifies the value that is to be assigned to the resource.
For details about modifying resources, see X(1 X).
Because each X Window System toolkit-based application can consist of a combination of widgets (for example, push buttons and a scroll
bar), you can form the name string for a new resource specification by adding widget class and name identifiers to the string. For further
information about adding class and name identifiers, see X(1 X).
The following sample shows the optacon resources and their default values:
*dev: /dev/tty00 *interval: 10
TRADEMARKS
X Window System is a trademark of MIT.
The Optacon II is a product of TeleSensory Corporation,
P.O. Box 7455
Mountain View, CA 94039-7455
800-227-8418
tele@netcom.com
SEE ALSO X(1X)optacon(1X)
Check Out this Related Man Page
XtGetSubresources(3Xt) MIT X11R4 XtGetSubresources(3Xt)Name
XtGetSubresources, XtGetApplicationResources - obtain subresources or application resources
Syntax
void XtGetSubresources(w, base, name, class, resources, num_resources, args, num_args)
Widget w;
XtPointer base;
String name;
String class;
XtResourceList resources;
Cardinal num_resources;
ArgList args;
Cardinal num_args;
void XtGetApplicationResources(w, base, resources, num_resources, args, num_args)
Widget w;
XtPointer base;
XtResourceList resources;
Cardinal num_resources;
ArgList args;
Cardinal num_args;
Arguments
args Specifies the argument list to override resources obtained from the resource database.
base Specifies the base address of the subpart data structure where the resources should be written.
class Specifies the class of the subpart.
name Specifies the name of the subpart.
num_args Specifies the number of arguments in the argument list.
num_resources
Specifies the number of resources in the resource list.
resources Specifies the resource list for the subpart.
w Specifies the widget that wants resources for a subpart or that identifies the resource database to search.
Description
The function constructs a name/class list from the application name/class, the name/classes of all its ancestors, and the widget itself.
Then, it appends to this list the name/class pair passed in. The resources are fetched from the argument list, the resource database, or
the default values in the resource list. Then, they are copied into the subpart record. If args is NULL, num_args must be zero. However,
if num_args is zero, the argument list is not referenced.
The function first uses the passed widget, which is usually an application shell, to construct a resource name and class list, Then, it
retrieves the resources from the argument list, the resource database, or the resource list default values. After adding base to each
address, copies the resources into the address given in the resource list. If args is NULL, num_args must be zero. However, if num_args
is zero, the argument list is not referenced. The portable way to specify application resources is to declare them as members of a struc-
ture and pass the address of the structure as the base argument.
See AlsoXtGetResourceList(3Xt)
X Window System Toolkit: The Complete Programmer's Guide and Specification, Paul J. Asente and Ralph Swick
X Window System: The Complete Reference, Second Edition, Robert W. Scheifler and James Gettys
XtGetSubresources(3Xt)