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CentOS 7.0 - man page for xdevicetimecoord (centos section 3)


       XGetDeviceMotionEvents, XDeviceTimeCoord - get device motion history

       #include <X11/extensions/XInput.h>

       XDeviceTimeCoord *XGetDeviceMotionEvents( Display *display,
						 XDevice *device,
						 Time start,
						 Time stop,
						 int *nevents_return,
						 int *mode_return,
						 int *axis_count_return);

	      Specifies the connection to the X server.

	      Specifies the device whose motion history is to be

       start, stop
	      Specify the time interval in which the events are
	      returned from the motionhistory buffer.You can pass a
	      timestamp or CurrentTime.

	      Returns the number of events from the motion history

	      Returns the mode of the device (Absolute or Relative).

	      Returns the count of axes being reported.

	   The server may retain the recent history of the device motion
	   and do so to a finer granularity than is reported by
	   DeviceMotionNotify events. The XGetDeviceMotionEvents request
	   makes this history available.

	   The XGetDeviceMotionEvents 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 CurrentTime.

	   The mode indicates whether the device is reporting absolute
	   positional data (mode = Absolute ) or relative motion data
	   (mode = Relative ). Some devices allow their mode to be changed
	   via the XSetDeviceMode request. These constants are defined in
	   the file XI.h. The axis_count returns the number of axes or
	   valuators being reported by the device.

	   XGetDeviceMotionEvents can generate a BadDevice, or BadMatch


	   The XDeviceTimeCoord structure contains:

	   typedef struct {
	       Time time;
	       int *data;
	   } XDeviceTimeCoord;

	   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 Absolute, the values
	   are the raw values generated by the device. These may be scaled
	   by client programs using the maximum values that the device can
	   generate. The maximum value for each axis of the device is
	   reported in the max_val field of the XAxisInfo returned by the
	   XListInputDevices request. If the mode is Relative, the data
	   values are the relative values generated by the device.

	   You should use XFreeDeviceMotionEvents to free the data
	   returned by this request.

	   Errors returned by this request: BadDevice, BadMatch.

		  An invalid device was specified. The specified device
		  does not exist or has not been opened by this client via
		  XOpenInputDevice. This error may also occur if the
		  specified device is the X keyboard or X pointer device.

		  This error may occur if an XGetDeviceMotionEvents
		  request is made specifying a device that has no
		  valuators and reports no axes of motion.

					    03/09/2013			  XGETDEVICEMOTIONEVEN(3)

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