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.ds f \s-2INQUIRE STROKE DEVICE STATE\s+2
.TH "INQUIRE STROKE DEVICE STATE" 3P "16 August 1991"
.SH NAME
INQUIRE STROKE DEVICE STATE \- inquire state of a stroke device
.IX "Stroke Input Devices" "INQUIRE STROKE DEVICE STATE"
.SH SYNOPSIS
.SS C Syntax
.ft B
.ta 1.25i 3i
.nf
void
pinq_stroke_st( ws, dev, type, store, err, op_mode, echo_switch, init_view_ind, init_stroke, 
    prompt_echo, echo_area, stroke_data)
Pint	ws;	\fIworkstation identifier\fP
Pint	dev;	\fIstroke device number\fP
Pinq_type	type;	\fItype of returned value\fP
Pstore	store;	\fIhandle to Store object\fP
Pint	*err;	\fIOUT error indicator\fP
Pop_mode	*op_mode	\fIOUT operating mode\fP
Pecho_switch	*echo_switch;	\fIOUT echo switch\fP
Pint	*init_view_ind;	\fIOUT initial view indicator\fP
Ppoint_list	**init_stroke;	\fIOUT initial stroke\fP
Pint	*prompt_echo;	\fIOUT prompt/echo type\fP
Plimit	*echo_area;	\fIOUT echo area\fP
Pstroke_data	**stroke_data;	\fIOUT data record\fP
.fi
.ft R
.SS Required PHIGS Operating States
(PHOP, WSOP, *, *)
.SH DESCRIPTION
.SS Purpose
Use \*f to retrieve the current state of the specified stroke device.
.SS C Input Parameters
Applications using the \s-2C\s+2 binding must create a buffer to be used by this
function as memory space for storing data associated with the device state.
This buffer is passed as the \fIstore\fP argument.
.LP 
The store buffer is a data area managed by \s-2PHIGS\s+2. While the 
application is responsible for creating the initial buffer through a call to 
\s-2CREATE STORE\s+2, \s-2PHIGS\s+2 manages this area such that there is
sufficient memory for the specific inquiry. The stroke device data record
within the store buffer is accessed via the pointer pointed to by \fIstroke_data\fR.
.IP \fIws\fP
Workstation identifier. An integer specifying the workstation with which
the specified stroke device is associated.
.IP \fIdev\fP
The device number of the stroke device.
See the \fIAvailable Devices\fP section of \s-2INITIALIZE STROKE\s+2
for a description of the available devices.
.IP \fItype\fP
An enumerated value specifying whether the values to be returned are 
those originally specified by the application (\s-2PINQ_SET\s+2), or
those resulting after \s-2PHIGS\s+2 mapped them to ones available on the
workstation (\s-2PINQ_REALIZED\s+2).  A Pinq_type structure is defined as:
.nf
.ta .5i +\w'PINQ_REALIZED     'u
.sp .4
typedef enum {
.sp .2
	PINQ_SET,
	PINQ_REALIZED
.sp .2
} Pinq_type;
.fi
.IP \fIstore\fP
The memory buffer \s-2PHIGS\s+2 is to use for storing the information
returned.  
This buffer must exist prior to calling this function (see
\s-2CREATE STORE (3P)\s+2).
.SS C Output Parameters
.IP \fIerr\fP
A pointer to the location to store the error number of any error detected by this function.
.IP \fIop_mode\fP
The operating mode. Pop_mode is an enumerated type defined in phigs.h
with the following values:
.nf
.ta .5i
.sp .4
typedef enum {
.sp .2
	POP_REQ,
	POP_SAMPLE,
	POP_EVENT
.sp .2
} Pop_mode;
.sp .4
.fi
.IP \fIecho_switch\fP
The echo state. Pecho_switch is an enumerated type defined in phigs.h
with the following values:
.nf
.ta .5i
.sp .4
typedef enum {
.sp .2
	PSWITCH_NO_ECHO,
	PSWITCH_ECHO
.sp .2
} Pecho_switch;
.sp .4
.fi
.IP \fIinit_view_ind\fP
Initial view indicator.
.IP \fIinit_stroke\fP
A pointer to the initial stroke.
Ppoint_list is defined in phigs.h as follows:
.nf
.ta .5i +1i +1i +1i
.sp .4
typdef struct {
.sp .2
	Pint	num_points;	/* number of Ppoint3s in the list */
	Ppoint	*points;	/* list of points */
.sp .2
} Ppoint_list;
.fi
.sp .4
Ppoint is defined in phigs.h as follows:
.nf
.ta .5i +1i +1i +1i
.sp .4
typdef struct {
.sp .2
	Pfloat	x;	/* x coordinate */
	Pfloat	y;	/* x coordinate */
.sp .2
} Ppoint;
.fi
.sp .4
.IP \fIprompt_echo\fP 
The prompt/echo type desired.
See the \fIAvailable Devices\fP Section of \s-2INITIALIZE STROKE\s+2
for a description of the available types.
.IP \fIecho_area\fP
A pointer to a variable of type Plimit that contains the echo area of
the device. Plimit is defined in phigs.h as follows:
.sp .4
.nf
.ta .5i  +1i  +1i   
.sp .2
typedef struct {
.sp .2
	Pfloat	x_min;	/* x min */
	Pfloat	x_max;	/* x max */
	Pfloat	y_min;	/* y min */
	Pfloat	y_max;	/* y max */
.sp .2
} Plimit;
.fi
.bp
.IP \fIstroke_data\fP
Pointer to a pointer that points to the stroke device state within \fIstore\fR.
Pstroke_data is defined in phigs.h as follows:
.nf
.ta .5i +.5ii +.5i +1i +1.25i
.sp .4
typedef struct {
	Pint	buffer_size;	/* input buffer size */
	Pint	init_pos;		/* initial editing position */       
	Pfloat	x_interval;	/* x interval */        
	Pfloat	y_interval;	/* y interval */        
	Pfloat	time_interval;	/* time interval */        
	union {
		struct {
			Pint	unused;
		} pet_r1;
		struct {
			Pint	unused;
		} pet_r2;
		struct {
			Pmarker_attrs	marker_attrs;	/* marker attributes */
		} pet_r3;
		struct {
			Pline_attrs	line_attrs;	/* line attributes */
		} pet_r4;
	} pets;
} Pstroke_data;
.fi
.SS Execution
\*f returns the current state of the
specified stroke device, which is stored in the workstation
state list of the workstation associated with the device.  The
current state includes the operating mode, echo switch, initial stroke
value, prompt/echo type, echo area, and data record.
See \s-2SET STROKE MODE\s+2 for a description of the operating mode and the
echo switch, and how to set these values.
See \s-2INITIALIZE STROKE\s+2 for a description of the initial stroke
value, prompt/echo type, echo area, and data record contents, and how to
set these values.
.LP
In the event of an error, the \fIerror indicator\fP 
indicates the error number of the error detected, and no other output data
is returned.  If no error is detected, the \fIerror indicator\fP 
is set to zero, and the inquired information will be available in the output
parameters.  Since this is an inquiry function, \s-2ERROR HANDLING\s+2 is not
invoked when an error is detected by this function.
.SH ERRORS
.IP 003
Ignoring function, function requires state (\s-2PHOP, WSOP, *, *\s+2)
.IP 054
Ignoring function, the specified workstation is not open
.IP 061
Ignoring function, specified workstation is neither of category \s-2INPUT\s+2
nor of category \s-2OUTIN\s+2
.IP 250
Ignoring function, the specified device is not available
on the specified workstation
.SH SEE ALSO
.nf
.IP
.ta 0.5i
.SM "SET STROKE MODE (3P)"
.SM "INITIALIZE STROKE (3P)"
.SM "INQUIRE STROKE DEVICE STATE 3 (3P)"
.SM "CREATE STORE (3P)"
.SM "DELETE STORE (3P)"
.fi