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+.\"
+.\" Copyright ([\d,\s]*) by Hewlett-Packard Company, Ardent Computer, 
+.\" 
+.\" Permission to use, copy, modify, distribute, and sell this documentation 
+.\" for any purpose and without fee is hereby granted, provided that the above
+.\" copyright notice and this permission notice appear in all copies.
+.\" Ardent, and Hewlett-Packard make no representations about the 
+.\" suitability for any purpose of the information in this document.  It is 
+.\" provided \`\`as is'' without express or implied warranty.
+.\" 
+.\" $Xorg: XGetDvMo.man,v 1.4 2001/03/16 17:51:13 pookie Exp $
+.ds xL Programming with Xlib
+.TH XGetDeviceMotionEvents 3X11 "Release 6.6" "X Version 11" "X FUNCTIONS"
+.SH NAME
+XGetDeviceMotionEvents, XDeviceTimeCoord \- get device motion history 
+.SH SYNTAX
+XDeviceTimeCoord *XGetDeviceMotionEvents\^(\fIdisplay\fP\^, \fIdevice\fP\^,
+\fIstart\fP\^, \fIstop\fP\^,
+.br
+\fInevents_return\fP\^, \fImode_return\fP\^, \fIaxis_count_return\fP\^)
+.br
+      Display *\fIdisplay\fP\^;
+.br
+      XDevice *\fIdevice\fP\^;
+.br
+      Time \fIstart\fP\^, \fIstop\fP\^;	
+.br
+      int *\fInevents_return\fP\^;
+.br
+      int *\fImode_return\fP\^;
+.br
+      int *\fIaxis_count_return\fP\^;
+.SH ARGUMENTS
+.TP 12
+.I display
+Specifies the connection to the X server.
+.TP 12
+.I device
+Specifies the device whose motion history is to be queried.
+.TP 12
+.I start
+.br
+.ns
+.TP 12
+.I stop
+Specify the time interval in which the events are returned from the motion
+history buffer.
+You can pass a timestamp or \fICurrentTime\fP.
+.TP 12
+.I nevents_return
+Returns the number of events from the motion history buffer.
+.TP 12
+.I mode_return
+Returns the mode of the device (\fIAbsolute\fP or \fIRelative\fP).
+.TP 12
+.I axis_count_return
+Returns the count of axes being reported.
+.SH DESCRIPTION
+The server may retain the recent history of the device motion
+and do so to a finer granularity than is reported by
+\fIDeviceMotionNotify\fP
+events.
+The \fIXGetDeviceMotionEvents\fP request makes this history available.
+.LP
+The
+\fIXGetDeviceMotionEvents\fP
+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
+\fICurrentTime\fP.
+.LP
+The \fImode\fP indicates whether the device is reporting absolute positional
+data (mode=\fIAbsolute\fP) or relative motion data (mode=\fIRelative\fP).
+Some devices allow their mode to be changed via the \fIXSetDeviceMode\fP
+request.
+These constants are defined in the file XI.h.  The \fIaxis_count\fP
+returns the number of axes or valuators being reported by the device.
+.LP
+\fIXGetDeviceMotionEvents\fP can generate a \fIBadDevice\fP, or \fIBadMatch\fP
+error.
+.SH STRUCTURES
+The
+\fIXDeviceTimeCoord\fP
+structure contains:
+.LP
+.nf
+typedef struct {
+	Time time;
+	int *data;
+} XDeviceTimeCoord;
+.fi
+.LP
+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 \fIAbsolute\fP, 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 \fIXAxisInfo\fP returned by the \fIXListInputDevices\fP 
+request.  If the mode is \fIRelative\fP, the data values are the relative
+values generated by the device.
+.LP
+You should use \fIXFreeDeviceMotionEvents\fP to free the data returned by
+this request.
+.LP
+Errors returned by this request: \fIBadDevice\fP, \fIBadMatch\fP.
+.SH DIAGNOSTICS
+.TP 12
+\fIBadDevice\fP
+An invalid device was specified.  The specified device does not exist or has 
+not been opened by this client via \fIXOpenInputDevice\fP.  This error may
+also occur if the specified device is the X keyboard or X pointer device.
+.TP 12
+\fIBadMatch\fP
+This error may occur if an \fIXGetDeviceMotionEvents\fP request is made 
+specifying
+a device that has no valuators and reports no axes of motion.
+.SH "SEE ALSO"
+.br
+\fI\*(xL\fP