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XChangePointerControl,
XGetPointerControl - control pointer
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;
- 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.
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.
- 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.
Xlib - C Language
X Interface
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