XChangePointerControl(3X11) MIT X11R4 XChangePointerControl(3X11)
Name
XChangePointerControl, XGetPointerControl - 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 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. Accelera-
tion 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 for the
pointer values to be set, or the parameters are unchanged. Negative values (other than -1) generate a error, as does a zero value for the
accel_denominator argument.
can generate a error.
The function returns the pointer's current acceleration multiplier and acceleration threshold.
Diagnostics
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
X Window System: The Complete Reference, Second Edition, Robert W. Scheifler and James Gettys
XChangePointerControl(3X11)