| XChangePointerControl(3) | Library Functions Manual | XChangePointerControl(3) | 
NAME
 XChangePointerControl, XGetPointerControl - control pointer
SYNTAX
int XChangePointerControl(Display *display, Bool do_accel, Bool  do_threshold, int accel_numerator, int  accel_denominator, int threshold);
int XGetPointerControl(Display *display, int * accel_numerator_return, int *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