gii_val_event(3) GGI gii_val_event(3)NAME
gii_val_event - LibGII valuator events
SYNOPSIS
#include <ggi/events.h>
typedef struct {
COMMON_DATA;
uint32_t first; /* first valuator reported */
uint32_t count; /* number reported */
int32_t value[32]; /* absolute/relative values */
} gii_val_event;
DESCRIPTION
A valuator is a representation of the state of an input device in terms of a physical quantity such as length. A valuator event, of type
gii_val_event, reports a change in any of those quantities.
GENERATED EVENTS
This structure is used for the evValRelative and evValAbsolute events.
STRUCTURE MEMBERS
A valuator may be either absolute or relative, like pointer motion events.
To interpret the numbers, query valuator device info with the GII_CMDCODE_GETVALINFO command code.
SEE ALSO gii_event(3), gii_cmddata_getvalinfo(3)libgii-1.0.x 2006-12-30 gii_val_event(3)
Check Out this Related Man Page
gii_cmddata_getvalinfo(3) GGI gii_cmddata_getvalinfo(3)NAME
gii_cmddata_getvalinfo, gii_phystype, gii_valrange - GII valuators description
SYNOPSIS
#include <ggi/events.h>
typedef struct gii_valrange {
int32_t min, center, max;
} gii_valrange;
typedef struct {
uint32_t number;
char longname[75];
char shortname[5];
gii_valrange range;
gii_phystype phystype;
int32_t SI_add,SI_mul,SI_div,SI_shift;
} gii_cmddata_getvalinfo;
DESCRIPTION
This structure is used to describe the values reported by a specific valuator.
STRUCTURE MEMBERS
gii_cmddata_getvalinfo fields are defined as follow:
number Number of the queried valuator.
longname
A human-redable NULL terminated string identifying the valuator.
shortname
A NULL terminated abbreviated name for this valuator.
range Contains the minimum, center and maximum values for this valuator. Note that this range may change on some devices due to calibra-
tion, but it is usually not expected that a device recalibrates while in use. You should react gracefully to values received from
the valuator that are outside the specified range, though.
phystype
Gives the physical quantity the device measures. The idea is to report the thing the user actually controls. I.e. a Joystick actu-
ally measures resistance, but should report GII_PT_ANGLE or GII_PT_FORCE, as that is what the user does to the stick and what
results in the changed resistance.
SI_add, SI_mul, SI_div, SI_shift
Using these values, it is possible to give calibration data to the application or to compute the actual floating point value (in the
unit expressed in phystype) reported by the valuator with the following formula:
(float)(SI_add + value) * (float)SI_mul / (float)SI_div * pow(2.0, SI_shift);
PHYSICAL UNITS
The following physical units are defined for gii_phystype:
o GII_PT_UNKNOWN : unknown
o GII_PT_TIME : base unit s (second)
o GII_PT_FREQUENCY : base unit 1/s (Hz)
o GII_PT_LENGTH : base unit m (meter)
o GII_PT_VELOCITY : base unit m/s
o GII_PT_ACCELERATION : base unit m/s^2
o GII_PT_ANGLE : base unit radian
o GII_PT_ANGVELOCITY : base unit radian/s
o GII_PT_ANGACCELERATION : base unit radian/s^2
o GII_PT_AREA : base unit m^2
o GII_PT_VOLUME : base unit m^3
o GII_PT_MASS : base unit kg
o GII_PT_FORCE : base unit N (kg*m/s^2)
o GII_PT_PRESSURE : base unit N/m^2 (Pa)
o GII_PT_TORQUE : base unit Nm
o GII_PT_ENERGY : base unit Nm, VAs, J
o GII_PT_POWER : base unit Nm/s, VA, W
o GII_PT_TEMPERATURE : base unit K
o GII_PT_CURRENT : base unit A
o GII_PT_VOLTAGE : base unit V (kg*m^2/(As^3))
o GII_PT_RESISTANCE : base unit V/A (Ohm)
o GII_PT_CAPACITY : base unit As/V (Farad)
o GII_PT_INDUCTIVITY : base unit Vs/A (Henry)
SEE ALSO giiQueryValInfo(3)libgii-1.0.x 2006-12-30 gii_cmddata_getvalinfo(3)