.TH SCALE 9.SH NAMEscale \- Create and manipulate scale widgets.SH SYNOPSIS\f5scale\fI \fIpathName \fR?\fIoptions\fR?.SH STANDARD OPTIONS.EX-activebackground -font               -orient-background       -foreground         -relief-borderwidth      -highlightcolor     -takefocus-disabledcolor    -highlightthickness.EE.SH "WIDGET-SPECIFIC OPTIONS".TP.B -bigincrement \fIdist\fRSome interactions with the scale cause its value to change by``large'' increments;  this option specifies the size of thelarge increments.  If specified as 0, the large increments defaultto 1/10 the range of the scale..TP.B -command \fIcommand\fRSpecifies the prefix of a Tk command to invoke whenever the scale'svalue is changed via a widget command.The actual command consistsof this option followed by a space and a real number indicating thenew value of the scale..TP.B -from \fIfrac\fRA real value corresponding to the left or top end of the scale..TP.B -height \fIdist\fPSpecifies a desired height for the scale.If this option isn't specified, the scale is given a default height..TP.B -label \fIstring\fRA string to display as a label for the scale. If the option is specifiedas an empty string, no label is displayed..TP.B -resolution \fIfrac\fRA real value specifying the resolution for the scale.If this value is greater than zero then the scale's value will always berounded to an even multiple of this value, as will tick marks andthe endpoints of the scale.  If the value is less than zero then norounding occurs.  Defaults to 1 (i.e., the value will be integral)..TP.B -showvalue \fIboolean\fRSpecifies a boolean value indicating whether or not the currentvalue of the scale is to be displayed..TP.B -sliderlength \fIdist\fRSpecfies the size of the slider along the slider'slong dimension...TP.B -sliderrelief \fIrelief\fISpecifies the relief to use when drawing the slider..TP.B -state \fIstate\fRSpecifies one of three states for the scale:  \f5normal\fR,\f5active\fR, or \f5disabled\fR.If the scale is disabled then the value may not be changed and the scalewon't activate.If the scale is active, the slider is displayed using the colourspecified by the \f5activebackground\fR option..TP.B -tickinterval \fIfrac\fRMust be a real value.Determines the spacing between numericaltick marks displayed below or to the left of the slider.If 0, no tick marks will be displayed..TP.B -to \fIfrac\fRSpecifies a real value correspondingto the right or bottom end of the scale.This value may be either less than or greater than the \f5from\fR option..TP.B -width \fIdist\fPSpecifies a desired width for the scale.If this option isn't specified, the scale is given a default width..SH DESCRIPTIONThe \f5scale\fR command creates a new window (given by the\fIpathName\fR argument) and makes it into a scale widget.Additionaloptions, described above, may be specified on the command lineto configure aspects of the scale such as its colours, orientation,and relief.  The \f5scale\fR command returns its\fIpathName\fR argument.  At the time this command is invoked,there must not exist a window named \fIpathName\fR..PPA scale is a widget that displays a rectangular \fItrough\fR and asmall \fIslider\fR.  The trough corresponds to a rangeof real values (determined by the \f5from\fR, \f5to\fR, and\f5resolution\fR options),and the position of the slider selects a particular real value.The slider's position (and hence the scale's value) may be adjustedwith the mouse or keyboard as described in the BINDINGSsection below.  Whenever the scale's value is changed, a Tkcommand is invoked (using the \f5command\fR option) to notifyother interested widgets of the change..PPThree annotations may be displayed in a scale widget:  a labelappearing at the top right of the widget (top left for horizontalscales), a number displayed just to the left of the slider(just above the slider for horizontal scales), and a collectionof numerical tick marks just to the right of the trough(just below the trough for horizontal scales).  Each of these threeannotations may be enabled or disabled using theconfiguration options. .SH "WIDGET COMMAND"The \f5scale\fR command creates a new Tk command whosename is \fIpathName\fR.  Thiscommand may be used to invoke variousoperations on the widget.  It has the following general form:.RS.EX\fIpathName option \fR?\fIarg arg ...\fR?.EE.RE\fIOption\fR and the \fIarg\fRsdetermine the exact behaviour of the command.  The followingcommands are possible for scale widgets:.TP\fIpathName \f5cget\fR \fIoption\fRReturns the current value of the configuration option givenby \fIoption\fR.\fIOption\fR may have any of the values accepted by the \f5scale\fRcommand..TP\fIpathName \f5configure\fR ?\fIoption\fR? ?\fIvalue option value ...\fR?Query or modify the configuration options of the widget.If no \fIoption\fR is specified, returns a list of all ofthe available options for \fIpathName\fR.  Ifone or more \fIoption-value\fR pairs are specified, then the commandmodifies the given widget option(s) to have the given value(s);  inthis case the command returns an empty string.\fIOption\fR may have any of the values accepted by the \f5scale\fRcommand..TP\fIpathName \f5coords \fR?\fIvalue\fR?Returns a list whose elements are the x and y coordinates ofthe point along the centreline of the trough that correspondsto \fIvalue\fR.If \fIvalue\fR is omitted then the scale's current value is used..TP\fIpathName \f5get\fR ?\fIx y\fR?If \fIx\fR and \fIy\fR are omitted, returns the current valueof the scale.  If \fIx\fR and \fIy\fR are specified, they givepixel coordinates within the widget;  the command returnsthe scale value corresponding to the given pixel.Only one of \fIx\fR or \fIy\fR is used:  for horizontal scales\fIy\fR is ignored, and for vertical scales \fIx\fR is ignored..TP\fIpathName \f5identify\fR \fIx y\fRReturns a string indicating what part of the scale lies underthe coordinates given by \fIx\fR and \fIy\fR.A return value of \f5slider\fR means that the point is overthe slider;  \f5trough1\fR means that the point is over theportion of the slider above  or to the left of the slider;and \f5trough2\fR means that the point is over the portionof the slider below or to the right of the slider.If the point isn't over one of these elements, an empty stringis returned..TP\fIpathName \f5set\fR \fIvalue\fRThis command is invoked to change the current value of the scale,and hence the position at which the slider is displayed.  \fIValue\fRgives the new value for the scale.The command has no effect if the scale is disabled..SH BINDINGSTk automatically creates bindings for scales that give themthe following default behaviour.Where the behaviour is different for vertical and horizontal scales,the horizontal behaviour is described in parentheses..IP [1]If button 1 is pressed in the trough, the scale's value willbe incremented or decremented by the value of the \f5bigincrement\fRoption so that the slider moves in the direction of the cursor. If the button is held down, the action auto-repeats..IP [2]If button 1 is pressed over the slider, the slider can be draggedwith the mouse..IP [3]If the widget receives Up-arrow or Left-arrow key events, the scale's valuewill be incremented or decremented so as to adjust the value towards the.BR from value ..IP [4]If the widget receives Down-arrow or Right-arrow key events, the scale's valuewill be incremented or decremented so as to adjust the value towards the.BR to value ..PPIf the scale is disabled using the \f5state\fR option thennone of the above bindings have any effect..PPThe behaviour of scales can be changed by defining new bindings forindividual widgets..SH SEE ALSO.IR options (9),.IR types (9)