X Version 11 (Release 5)
XChangePointerControl(XS)
XChangePointerControl --
control pointer
Syntax
XChangePointerControl(display, do_accel, do_threshold, accel_numerator,
accel_denominator, threshold)
Display *display;
Bool do_accel, do_threshold;
int accel_numerator, accel_denominator;
int threshold;
XGetPointerControl(display, accel_numerator_return,
accel_denominator_return, threshold_return)
Display *display;
int *accel_numerator_return, *accel_denominator_return;
int *threshold_return;
Arguments
accel_denominator-
Specifies the denominator for the acceleration multiplier.
accel_denominator_return-
Returns the denominator for the acceleration multiplier.
accel_numerator-
Specifies the numerator for the acceleration multiplier.
accel_numerator_return-
Returns the numerator for the acceleration multiplier.
display-
Specifies the connection to the X server.
do_accel-
Specifies a Boolean value that controls whether the values for
the accel_numerator or accel_denominator are used.
do_threshold-
Specifies a Boolean value that controls whether
the value for the threshold is used.
threshold-
Specifies the acceleration threshold.
threshold_return-
Returns the acceleration threshold.
Description
The XChangePointerControl
function defines how the pointing device moves.
The acceleration, expressed as a fraction, is a multiplier for movement.
For example, specifying 3/1 means the pointer
moves three times as fast as normal.
The fraction may be rounded arbitrarily by the X server.
Acceleration only takes effect if the pointer moves
more than threshold pixels at once and only applies
to the amount beyond the value in the threshold argument.
Setting a value to -1 restores the default.
The values of the do_accel and do_threshold
arguments must be True for the pointer values
to be set, or the parameters are unchanged.
Negative values (other than -1) generate a
``BadValue'' error, as does a zero value
for the accel_denominator argument.
XChangePointerControl can generate a
``BadValue'' error.
The XGetPointerControl function returns the pointer's
current acceleration multiplier and acceleration threshold.
Diagnostics
``BadValue''-
Some numeric value falls outside the range of values accepted by the request.
Unless a specific range is specified for an argument, the full range defined
by the argument's type is accepted. Any argument defined as a set of
alternatives can generate this error.
See also
Xlib - C Language X Interface
© 2003 X Lib Library (XS)
SCO OpenServer Release 5.0.7 -- 11 February 2003