231 lines
5.3 KiB
Groff
231 lines
5.3 KiB
Groff
'\" t
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.\" Title: xgetdevicemotionevents
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.\" Author: [FIXME: author] [see http://docbook.sf.net/el/author]
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.\" Generator: DocBook XSL Stylesheets v1.79.1 <http://docbook.sf.net/>
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.\" Date: 06/19/2019
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.\" Manual: \ \&
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.\" Source: \ \&
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.\" Language: English
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.\"
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.TH "XGETDEVICEMOTIONEVEN" "libmansuffix" "06/19/2019" "\ \&" "\ \&"
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.\" -----------------------------------------------------------------
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.\" * Define some portability stuff
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.\" -----------------------------------------------------------------
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.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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.\" http://bugs.debian.org/507673
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.\" http://lists.gnu.org/archive/html/groff/2009-02/msg00013.html
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.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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.ie \n(.g .ds Aq \(aq
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.el .ds Aq '
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.\" -----------------------------------------------------------------
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.\" * set default formatting
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.\" -----------------------------------------------------------------
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.\" disable hyphenation
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.nh
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.\" disable justification (adjust text to left margin only)
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.ad l
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.\" -----------------------------------------------------------------
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.\" * MAIN CONTENT STARTS HERE *
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.\" -----------------------------------------------------------------
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.SH "NAME"
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XGetDeviceMotionEvents, XDeviceTimeCoord \- get device motion history
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.SH "SYNOPSIS"
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.sp
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.nf
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#include <X11/extensions/XInput\&.h>
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.fi
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.sp
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.nf
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XDeviceTimeCoord *XGetDeviceMotionEvents( Display *display,
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XDevice *device,
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Time start,
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Time stop,
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int *nevents_return,
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int *mode_return,
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int *axis_count_return);
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.fi
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.sp
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.nf
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display
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Specifies the connection to the X server\&.
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.fi
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.sp
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.nf
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device
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Specifies the device whose motion history is to be
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queried\&.
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.fi
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.sp
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.nf
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start, stop
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Specify the time interval in which the events are
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returned from the motion history buffer\&. You can pass a
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timestamp or CurrentTime\&.
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.fi
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.sp
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.nf
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nevents_return
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Returns the number of events from the motion history
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buffer\&.
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.fi
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.sp
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.nf
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mode_return
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Returns the mode of the device (Absolute or Relative)\&.
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.fi
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.sp
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.nf
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axis_count_return
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Returns the count of axes being reported\&.
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.fi
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.SH "DESCRIPTION"
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.sp
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.if n \{\
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.RS 4
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.\}
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.nf
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The server may retain the recent history of the device motion
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and do so to a finer granularity than is reported by
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DeviceMotionNotify events\&. The XGetDeviceMotionEvents request
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makes this history available\&.
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.fi
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.if n \{\
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.RE
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.\}
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.sp
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.if n \{\
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.RS 4
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.\}
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.nf
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The XGetDeviceMotionEvents request returns all events in the
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motion history buffer that fall between the specified start and
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stop times, inclusive\&. If the start time is later than the stop
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time or if the start time is in the future, no events are
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returned\&. If the stop time is in the future, it is equivalent
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to specifying CurrentTime\&.
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.fi
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.if n \{\
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.RE
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.\}
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.sp
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.if n \{\
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.RS 4
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.\}
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.nf
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The mode indicates whether the device is reporting absolute
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positional data (mode = Absolute ) or relative motion data
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(mode = Relative )\&. Some devices allow their mode to be changed
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via the XSetDeviceMode request\&. These constants are defined in
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the file XI\&.h\&. The axis_count returns the number of axes or
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valuators being reported by the device\&.
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.fi
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.if n \{\
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.RE
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.\}
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.sp
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.if n \{\
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.RS 4
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.\}
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.nf
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XGetDeviceMotionEvents can generate a BadDevice, or BadMatch
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error\&.
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.fi
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.if n \{\
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.RE
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.\}
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.sp
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Structures
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.sp
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.if n \{\
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.RS 4
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.\}
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.nf
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The XDeviceTimeCoord structure contains:
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.fi
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.if n \{\
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.RE
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.\}
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.sp
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.if n \{\
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.RS 4
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.\}
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.nf
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typedef struct {
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Time time;
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int *data;
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} XDeviceTimeCoord;
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.fi
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.if n \{\
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.RE
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.\}
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.sp
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.if n \{\
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.RS 4
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.\}
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.nf
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The time member is set to the time, in milliseconds\&. The data
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member is a pointer to an array of integers\&. These integers are
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set to the values of each valuator or axis reported by the
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device\&. There is one element in the array per axis of motion
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reported by the device\&. The value of the array elements depends
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on the mode of the device\&. If the mode is Absolute, the values
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are the raw values generated by the device\&. These may be scaled
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by client programs using the maximum values that the device can
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generate\&. The maximum value for each axis of the device is
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reported in the max_val field of the XAxisInfo returned by the
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XListInputDevices request\&. If the mode is Relative, the data
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values are the relative values generated by the device\&.
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.fi
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.if n \{\
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.RE
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.\}
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.sp
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.if n \{\
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.RS 4
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.\}
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.nf
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You should use XFreeDeviceMotionEvents to free the data
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returned by this request\&.
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.fi
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.if n \{\
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.RE
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.\}
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.sp
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.if n \{\
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.RS 4
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.\}
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.nf
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Errors returned by this request: BadDevice, BadMatch\&.
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.fi
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.if n \{\
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.RE
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.\}
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.SH "DIAGNOSTICS"
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.sp
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.if n \{\
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.RS 4
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.\}
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.nf
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BadDevice
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An invalid device was specified\&. The specified device
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does not exist or has not been opened by this client via
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XOpenInputDevice\&. This error may also occur if the
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specified device is the X keyboard or X pointer device\&.
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.fi
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.if n \{\
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.RE
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.\}
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.sp
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.if n \{\
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.RS 4
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.\}
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.nf
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BadMatch
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This error may occur if an XGetDeviceMotionEvents
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request is made specifying a device that has no
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valuators and reports no axes of motion\&.
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.fi
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.if n \{\
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.RE
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.\}
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