DOKK / manpages / debian 12 / tklib / controlwidget.3tk.en
controlwidget(3tk) controlwidget controlwidget(3tk) 







controlwidget - Collection of widgets for displaying and
    controlling numerical values








package require Tcl ?8.5?


package require Tk ?8.5?


package require snit ?2.0?


package require controlwidget ?0.1?


::controlwidget::meter w args


::controlwidget::slider w args


::controlwidget::equalizerBar w args


::controlwidget::thermometer w args


::controlwidget::voltmeter w args


::controlwidget::tachometer w args


::controlwidget::rdial w args


$widget get


$widget set value


::controlwidget::led w args


::controlwidget::radioMatrix w args


$led on


$led off


$led setstate state


$matrix get


$matrix set index












The controlwidget package focuses on the display and interactive
    control of numerical values. It mimicks several of the meters and controls
    found in laboratory settings but also daily life: volt meters, equalizers
    and tachometers to name a few. They can be seen as alternatives for the
    scale widget.


Note: The package has not sofar been tested extensively,
    and that may result in an unexpected appearance if you use sizes that are
    different than the defaults. Also not all options for the coloring of the
    various parts and fonts and so on have been tested, so that may be another
    source of bugs.


A last note: some parts have not been included in any option, most
    notably the colors of parts that require lighter and darker shades to
    cooperate.








The package distinguishes several typed of widgets:


    
  
  • Vertical meters: the value of the variable is translated into a vertical
      position, like with the coloured bars you find on your stereo
      installation.
    • 
  
  • Angle displays: the value of the variable is related to the angle of a
      needle, like with tachometers.
    • 
  
  • Interactive widgets: most widgets allow you to change the value of the
      variable by pressing the mouse button on the needle and shifting it up and
      down or left and right.
    • 
  
  • Non-interactive widgets: some widgets, like the thermometer widget, do not
      allow such interaction.
    • 
  
  • Logical or choice widgets: some widgets display the values as either
      on/off (or true/false) or as one of a set of discrete choices.
    • 



All widgets have in common, however, that you can connect them to
    a variable and that changing the variable changes the display. Forthermore,
    all widgets have the set and get methods to interact with the value that the
    widget displays (whether that is stored in a global variable or not).


They also have in common that their appearance and behaviour is
    determined by one or more options that you can set at creation time and
    often later on as well. The widgets are all based on the snit
    package, so that the methods configure and cget are available
    to set and get these options.








Currently the package contains these widgets of the vertical
    meter type:



  
::controlwidget::meter w args

  
Create a vertical meter consisting of an axis and a moveable arrow.







  

  
Name of the widget to be created.

  

  
List of key-value pairs, controlling the appearance and behaviour of the
      widget:







  

  
Name of the variable to be associated with the meter

  

  
Background color for the widget

  

  
Height of the widget

  

  
Width of the widget

  

  
Thickness of the displayed arrow in pixels

  

  
Color of the displayed arrow

  

  
Whether the arrow can be moved interactively or not









  
::controlwidget::slider w args

  
Create a widget containing one or more vertical sliders and an axis. You
      can shift the slider handles interactively via the mouse.







  

  
Name of the widget to be created.

  

  
List of key-value pairs, controlling the appearance and behaviour of the
      widget:







  

  
Name of the (list) variable to be associated with the widget

  

  
Number of sliders in the widget

  

  
Background color for the widget

  

  
Height of the widget

  

  
Width of the widget

  

  
Thickness of the slider handles

  

  
Width of the slider handles

  

  
Width of the troughs holding the sliders









  
::controlwidget::equalizerBar w args

  
Create a widget containing one or more vertical bars resembling those
      found on hifi graphical equalizers. Note that it is a read-only
    widget.







  

  
Name of the widget to be created.

  

  
List of key-value pairs, controlling the appearance and behaviour of the
      widget:







  

  
Name of the (list) variable to be associated with the widget

  

  
Number of bars in the widget

  

  
Background color for the widget

  

  
Height of the widget

  

  
Width of the widget

  

  
Width of the bars

  

  
Number of segments the bars are divided in

  

  
Color for values lower than the warning level

  

  
Color for values greater than the warning level

  

  
Threshold value, determines at what level the color changes









  
::controlwidget::thermometer w args

  
Create a thermometer widget (read-only)







  

  
Name of the widget to be created.

  

  
List of key-value pairs, controlling the appearance and behaviour of the
      widget:







  

  
Name of the (list) variable to be associated with the widget

  

  
Background color for the widget

  

  
Height of the widget

  

  
Width of the widget

  

  
Thickness of the line representing the "temperature"

  

  
Color of the line








These widgets all use a vertical axis and have the following
    options in common for configuring the axis:



  

  
Format string for formatting the numbers along the axis

  

  
Name of the font to be used for the numbers

  

  
Color of the axis (including the numbers)

  

  
Lower value for the axis

  

  
Upper value for the axis

  

  
Number of major tickmarks to draw (each is labelled)

  

  
Number of minor tickmarks to draw between two major tickmarks

  

  
Use a logarithmic axis (true) or a linear axis (false)




The package contains the following widget based on angle
  displays:



  
::controlwidget::voltmeter w args

  
Create a voltmeter-like widget.







  

  
Name of the widget to be created.

  

  
List of key-value pairs, controlling the appearance and behaviour of the
      widget:







  

  
Name of the variable to be associated with the meter

  

  
Value for the meter (if not associated with a variable)

  

  
The minimum value for data in the display

  

  
The maximum value for data in the display

  

  
The labels to be shown along the scale. (These are simply considered
      texts, so no relation with the minimum and maximum perse)

  

  
String to be shown below the dial

  

  
The width of the widget

  

  
The height of the widget

  

  
The width of the border surrounding the entire widget

  

  
The relief of the border surrounding the entire widget

  

  
The width of the border to indicate the widget has keyboard focus

  

  
Font of the labels to the scale

  

  
Font of the title below the dial

  

  
Color of the dial holding the needle

  

  
Color of the needle

  

  
Color of the scale (arc and tickmarks)

  

  
Color of the labels to the scale

  

  
Color of the title below the dial









  
::controlwidget::tachometer w args

  
Create a tachometer-like widget.







  

  
Name of the widget to be created.

  

  
List of key-value pairs, controlling the appearance and behaviour of the
      widget. In addition to the ones given for the voltmeter widget:







  

  
Name of the variable to be associated with the meter

  

  
Value for the meter (if not associated with a variable)

  

  
Level above which values are indicated with a different color

  

  
Color for the values above the "danger level"

  

  
Width for the colored band indicating the "danger level"

  

  
Color for the needle and the pin









  
::controlwidget::rdial w args

  
Create a rotating dial. You can drag the dial to change the value. With
      the shift button depressed the value changes slowly, with the control
      button depressed it changes fast. Similarly, you can control the dial via
      the mouse wheel, with the shift and control button working in the same way
      as with the mouse pointer. Note: The shift and control buttons
      currently have no effect on Windows.







  

  
Name of the widget to be created.

  

  
List of key-value pairs, controlling the appearance and behaviour of the
      widget:







  

  
Name of the variable to be associated with the dial

  

  
Value for the dial (if not associated with a variable)

  

  
Whether a horizontal disk/dial is required ("horizontal") or a
      vertical one ("vertical")

  

  
Initial step for incrementing or decrementing the value

  

  
Step size for controlling the dial's value via the mouse wheel

  

  
Factor on the step size for incrementing or decrementing the value
    slowly

  

  
Factor on the step size for incrementing or decrementing the value
    fast

  

  
Scale value to be applied to the actual value

  

  
Command to be called when the value changes

  

  
The width of the widget

  

  
The height of the widget

  

  
The background color of the widget (coloring of the disk/dial)

  

  
The foreground color of the widget (the marker lines)








All these widgets have the following methods:



  
$widget get

  
Return the current value or values shown in the widget

  
$widget set value

  
Reset the value or values shown in the widget. If the widget is associated
      with a variable, that variable is set as well.







  

  
New value or values for the widget






Two further widgets are available, meant to display logical
    values:



  
::controlwidget::led w args

  
Create a LED-like widget.







  

  
Name of the widget to be created.

  

  
List of key-value pairs, controlling the appearance and behaviour of the
      widget. In addition to the ones given for the voltmeter widget:







  

  
Name of the variable to be associated with the LED

  

  
Diameter of the LED widget

  

  
Color to use for the "on" state

  

  
Color to use for the "off" state









  
::controlwidget::radioMatrix w args

  
Create a matrix of radio buttons that behaves as a single widget.







  

  
Name of the widget to be created.

  

  
List of key-value pairs, controlling the appearance and behaviour of the
      widget. In addition to the ones given for the voltmeter widget:







  

  
Name of the variable to be associated with the matrix

  

  
The way the radio buttons are to be arranged (horizontal or vertical
      first)

  

  
Number of rows in the matrix

  

  
Number of columns in the matrix

  

  
Command associated with the radio buttons. Invoked when the active radio
      button changes.








The LED widget has the following public methods:



  
$led on

  
Set the state to "on"

  
$led off

  
Set the state to "off"

  
$led setstate state

  
Set the state according to the value of "state"







  

  
New state for the LED widget






The radioMatrix widget has two public methods:



  
$matrix get

  
Return the index of the currently selected radio button

  
$matrix set index

  
Select the radio button with index "index"







  

  
Index of the radio button to be set












The code for most of these widgets first appeared on the Wiki. In
    many cases, Arjen Markus merely refactored the code a bit and
    "snitified" some of them. The original code was developed by the
    following people:


    
  
  • Vertical meter, LED display, radio matrix: Ron Fox
    • 
  
  • Rotating dials: Gerhard Reithofer
    • 
  
  • Voltmeter and tachometer: Marco Maggi
    • 
  
  • Code for moving the needle: ?
    • 









This document, and the package it describes, will undoubtedly
    contain bugs and other problems. Please report such in the category
    controlwidget of the Tklib Trackers
    [http://core.tcl.tk/tklib/reportlist]. Please also report any ideas for
    enhancements you may have for either package and/or documentation.








controlling, displaying, numerical values, scale widget








Copyright (c) 2010 Ron Fox <rfox@...>
Copyright (c) 2010 Gerhard Reithofer <...@...>
Copyright (c) 2010 Marco Maggi <...@...>
Copyright (c) 2010 Arjen Markus <arjenmarkus@users.sourceforge.net>








  

    0.1
    tklib