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- XGetDeviceMotionEvents(3X11)X FUNCTIONSXGetDeviceMotionEvents(3X11)
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- NNAAMMEE
- XGetDeviceMotionEvents, XDeviceTimeCoord - get device
- motion history
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- SSYYNNTTAAXX
- XDeviceTimeCoord *XGetDeviceMotionEvents(_d_i_s_p_l_a_y, _d_e_v_i_c_e,
- _s_t_a_r_t, _s_t_o_p,
- _n_e_v_e_n_t_s___r_e_t_u_r_n, _m_o_d_e___r_e_t_u_r_n, _a_x_i_s___c_o_u_n_t___r_e_t_u_r_n)
- Display *_d_i_s_p_l_a_y;
- XDevice *_d_e_v_i_c_e;
- Time _s_t_a_r_t, _s_t_o_p;
- int *_n_e_v_e_n_t_s___r_e_t_u_r_n;
- int *_m_o_d_e___r_e_t_u_r_n;
- int *_a_x_i_s___c_o_u_n_t___r_e_t_u_r_n;
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- AARRGGUUMMEENNTTSS
- _d_i_s_p_l_a_y Specifies the connection to the X server.
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- _d_e_v_i_c_e Specifies the device whose motion history is
- to be queried.
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- _s_t_a_r_t
- _s_t_o_p Specify the time interval in which the events
- are returned from the motion history buffer.
- You can pass a timestamp or _C_u_r_r_e_n_t_T_i_m_e.
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- _n_e_v_e_n_t_s___r_e_t_u_r_n
- Returns the number of events from the motion
- history buffer.
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- _m_o_d_e___r_e_t_u_r_n Returns the mode of the device (_A_b_s_o_l_u_t_e or
- _R_e_l_a_t_i_v_e).
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- _a_x_i_s___c_o_u_n_t___r_e_t_u_r_n
- Returns the count of axes being reported.
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- DDEESSCCRRIIPPTTIIOONN
- The server may retain the recent history of the device
- motion and do so to a finer granularity than is reported
- by _D_e_v_i_c_e_M_o_t_i_o_n_N_o_t_i_f_y events. The _X_G_e_t_D_e_v_i_c_e_M_o_t_i_o_n_E_v_e_n_t_s
- request makes this history available.
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- The _X_G_e_t_D_e_v_i_c_e_M_o_t_i_o_n_E_v_e_n_t_s request returns all events in
- the motion history buffer that fall between the specified
- start and stop times, inclusive. If the start time is
- later than the stop time or if the start time is in the
- future, no events are returned. If the stop time is in
- the future, it is equivalent to specifying _C_u_r_r_e_n_t_T_i_m_e.
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- The _m_o_d_e indicates whether the device is reporting abso-
- lute positional data (mode=_A_b_s_o_l_u_t_e) or relative motion
- data (mode=_R_e_l_a_t_i_v_e). Some devices allow their mode to be
- changed via the _X_S_e_t_D_e_v_i_c_e_M_o_d_e request. These constants
- are defined in the file XI.h. The _a_x_i_s___c_o_u_n_t returns the
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- XGetDeviceMotionEvents(3X11)X FUNCTIONSXGetDeviceMotionEvents(3X11)
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- number of axes or valuators being reported by the device.
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- _X_G_e_t_D_e_v_i_c_e_M_o_t_i_o_n_E_v_e_n_t_s can generate a _B_a_d_D_e_v_i_c_e, or _B_a_d_-
- _M_a_t_c_h error.
-
- SSTTRRUUCCTTUURREESS
- The _X_D_e_v_i_c_e_T_i_m_e_C_o_o_r_d structure contains:
-
- typedef struct {
- Time time;
- int *data;
- } XDeviceTimeCoord;
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- The time member is set to the time, in milliseconds. The
- data member is a pointer to an array of integers. These
- integers are set to the values of each valuator or axis
- reported by the device. There is one element in the array
- per axis of motion reported by the device. The value of
- the array elements depends on the mode of the device. If
- the mode is _A_b_s_o_l_u_t_e, the values are the raw values gener-
- ated by the device. These may be scaled by client pro-
- grams using the maximum values that the device can gener-
- ate. The maximum value for each axis of the device is
- reported in the max_val field of the _X_A_x_i_s_I_n_f_o returned by
- the _X_L_i_s_t_I_n_p_u_t_D_e_v_i_c_e_s request. If the mode is _R_e_l_a_t_i_v_e,
- the data values are the relative values generated by the
- device.
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- You should use _X_F_r_e_e_D_e_v_i_c_e_M_o_t_i_o_n_E_v_e_n_t_s to free the data
- returned by this request.
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- Errors returned by this request: _B_a_d_D_e_v_i_c_e, _B_a_d_M_a_t_c_h.
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- DDIIAAGGNNOOSSTTIICCSS
- _B_a_d_D_e_v_i_c_e An invalid device was specified. The speci-
- fied device does not exist or has not been
- opened by this client via _X_O_p_e_n_I_n_p_u_t_D_e_v_i_c_e.
- This error may also occur if the specified
- device is the X keyboard or X pointer device.
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- _B_a_d_M_a_t_c_h This error may occur if an _X_G_e_t_D_e_v_i_c_e_M_o_t_i_o_n_-
- _E_v_e_n_t_s request is made specifying a device
- that has no valuators and reports no axes of
- motion.
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- SSEEEE AALLSSOO
- _P_r_o_g_r_a_m_m_i_n_g _w_i_t_h _X_l_i_b
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- X Version 11 Release 6.1 2
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