.\" $Xorg: StripChart,v 1.3 2000/08/17 19:42:28 cpqbld Exp $
.NH 2
StripChart Widget
.XS
	StripChart Widget
.XE
.IN "StripChart widget" "" "@DEF@"
.Ds 0
.TA 2.0i
.ta 2.0i
.sp
Application Header file	<Xaw/StripChart.h>
.IN "StripChart.h" ""
Class Header file	<Xaw/StripCharP.h>
.IN "StripCharP.h" ""
Class		stripChartWidgetClass
.IN "stripChartWidgetClass" "" 
Class Name	StripChart
.IN "StripChart widget" "class name"
Superclass	Simple
.sp
.De
.LP
The StripChart widget is used to provide a roughly real
time graphical chart of a single value.  For example,
it is used by the common client program \fBxload\fP
to provide a graph of processor load.  The StripChart
reads data from an application, and updates the chart
at the \fBupdate\fP interval specified.
.NH 3
Resources
.LP
When creating a StripChart widget instance, the following resources are
retrieved from the argument list or from the resource database:
.LP
.IN "StripChart widget" "resources"
.TS H
expand;
lw(1i) lw(1i) lw(1i) lw(.5i) lw(2i).
_
.sp 3p
.TB
Name	Class	Type	Notes	Default Value
.sp 3p
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.TH
.R
.sp 3p
accelerators	Accelerators	AcceleratorTable		NULL
ancestorSensitive	AncestorSensitive	Boolean	D	True
background	Background	Pixel		XtDefaultBackground
backgroundPixmap	Pixmap	Pixmap		XtUnspecifiedPixmap
borderColor	BorderColor	Pixel		XtDefaultForeground
borderPixmap	Pixmap	Pixmap		XtUnspecifiedPixmap
borderWidth	BorderWidth	Dimension		1
colormap	Colormap	Colormap		Parent's Colormap
cursor	Cursor	Cursor		None
cursorName	Cursor	String		NULL
depth	Depth	int	C	Parent's Depth
destroyCallback	Callback	XtCallbackList		NULL
foreground	Foreground	Pixel		XtDefaultForeground
getValue	Callback	XtCallbackList		NULL
height	Height	Dimension		120
highlight	Foreground	Pixel		XtDefaultForeground
insensitiveBorder	Insensitive	Pixmap		GreyPixmap
international	International	Boolean	C	False
jumpScroll	JumpScroll	int	A	half the width of the widget
mappedWhenManaged	MappedWhenManaged	Boolean		True
minScale	Scale	int		1
pointerColor	Foreground	Pixel		XtDefaultForeground
pointerColorBackground	Background	Pixel		XtDefaultBackground
screen	Screen	Pointer	R	Parent's Screen
sensitive	Sensitive	Boolean		True
translations	Translations	TranslationTable		NULL
update	Interval	int		10
width	Width	Dimension		120
x	Position	Position		0
y	Position	Position		0
.sp 3p
_
.TE
.Ac
.As
.Bg
.Gp
.Bc
.Bp
.Bw
.Cm
.Cu
.Cn
.Dp
.Dc
.IP \fBforeground\fP 1.5i
A pixel value which indexes the widget's colormap to derive the color
that will be used to draw the graph.
.IP \fBgetValue\fP 1.5i
A list of callback functions to call every \fBupdate\fP seconds. 
This list should contain one function, which returns the
value to be graphed by the StripChart widget.  The following
section describes the procedural interface.  Behavior when this list has
more than one function is undefined.
.Hw
.IP \fBhighlight\fP 1.5i
A pixel value which indexes the widget's colormap to derive the color
that will be used to draw the scale lines on the graph.
.Ib
.Ix
.IP \fBjumpScroll\fP 1.5i
When the graph reaches the right edge of the window it must be
scrolled to the left.  This resource specifies the number of pixels
it will jump.  Smooth scrolling can be achieved by setting this resource
to 1.
.Mm
.IP \fBminScale\fP 1.5i
The minimum scale for the graph.  The number of divisions on the graph
will always be greater than or equal to this value.
.Pf
.Pb
.Sc
.Se
.Tr
.IP \fBupdate\fP
The number of seconds between graph updates.  Each update is
represented on the graph as a 1 pixel wide line.  Every \fBupdate\fP seconds
the \fBgetValue\fP procedure will be used to get a new graph point,
and this point will be added to the right end of the StripChart.
.Xy
.NH 3
Getting the StripChart Value
.IN "StripChart widget" "getting the value"
.LP
The StripChart widget will call the application routine passed to it
as the \fBgetValue\fP callback function every \fBupdate\fP seconds to
obtain another point for the StripChart graph.  
.LP
The calling interface for the \fBgetValue\fP callback is:
.IN "StripChart widget" "getValue callback" "@DEF@"
.FD 0
void (*\fIgetValueProc\fP)(\fIw\fP, \fIclient_data\fP, \fIvalue\fP)
.br
     Widget \fIw\fP;
.br
     XtPointer \fIclient_data\fP;
.br
     XtPointer \fIvalue\fP;    /* double * */
.FN
.IP \fIw\fP 1i
Specifies the StripChart widget.
.IP \fIclient_data\fP 1i
Specifies the client data.
.IP \fIvalue\fP 1i
Returns a pointer to a double.  The application should set the address
pointed to by this argument to a double containing the value to be
graphed on the StripChart. 
.LP
This function is used by the StripChart to call an application routine.
The routine will pass the value to be graphed back to the the StripChart
in the \fBvalue\fP field of this routine.

