Smalltalk/X Webserver

Documentation of class 'DigitalLedDisplay':

Class: DigitalLedDisplay

Inheritance
Description
Class protocol
Instance protocol
Examples

Inheritance:

   Object
   |
   +--GraphicsMedium
      |
      +--DisplaySurface
         |
         +--SimpleView
            |
            +--View
               |
               +--DigitalLedDisplay

Package:: stx:libwidg3

Category:: Views-Misc

Version:: rev: 1.45 date: 2024/04/22 17:08:53; user: stefan; file: DigitalLedDisplay.st directory: libwidg3; module: stx stc-classLibrary: libwidg3

Description:

a simple fun-view, displaying a numeric value as a 7-Segment LED-line.
The model is a simple ValueHolder, holding a number.
This widget can be used as a component in calculator-like applications.

copyrightCOPYRIGHT (c) 1997 by eXept Software AG
             All Rights Reserved

This software is furnished under a license and may be used
only in accordance with the terms of that license and with the
inclusion of the above copyright notice.   This software may not
be provided or otherwise made available to, or used by, any
other person.  No title to or ownership of the software is
hereby transferred.

Class protocol:

image specs

constructFromSegments: segmentList

(self constructFromSegments:#(A B C)) inspect

Usage example(s):

     |v|
     v := TopView new extent:100@100.
     v openAndWaitUntilVisible.
     View drawingOnClosedDrawableSignal catch:[
         [true] whileTrue:[
            3 timesRepeat:[    
                #(A B C D E F) do:[:seg |
                    (self constructFromSegments:{seg}) displayOn:v at:0@0.
                    Delay waitForSeconds:0.1.
                ].
            ].    
            (self constructFromSegments:#(A B C D E F G)) displayOn:v at:0@0.
            Delay waitForSeconds:0.5.
            self ledOff displayOn:v at:0@0.
            Delay waitForSeconds:0.5.
            (self constructFromSegments:#(A B C D E F G)) displayOn:v at:0@0.
            Delay waitForSeconds:0.5.
            self ledOff displayOn:v at:0@0.
         ].
     ].

led0

Icon flushCachedIcons
self led0

led1

Icon flushCachedIcons.
self led1

led2

Icon flushCachedIcons.
self led2

led3

Icon flushCachedIcons.
self led3

led4

Icon flushCachedIcons.
self led4

led5

Icon flushCachedIcons.
self led5

led6

Icon flushCachedIcons.
self led6

led7

Icon flushCachedIcons.
self led7

led8

Icon flushCachedIcons.
self led8

led9

Icon flushCachedIcons.
self led9

ledA

Icon flushCachedIcons.
self ledA

ledC

Icon flushCachedIcons.
self ledC

ledCol

This resource specification was automatically generated
by the ImageEditor of ST/X.

Usage example(s):

     self ledCol inspect
     ImageEditor openOnClass:self andSelector:#ledCol
     Icon flushCachedIcons

ledConstructFromSegments: segments named: name

Icon flushCachedIcons

ledE

Icon flushCachedIcons
self ledE

ledF

Icon flushCachedIcons
self ledF

ledG

Icon flushCachedIcons
self ledG

ledH

Icon flushCachedIcons
self ledH

ledI

Icon flushCachedIcons
self ledI

ledJ

Icon flushCachedIcons
self ledJ

ledL

Icon flushCachedIcons
self ledL

ledMinus

Icon flushCachedIcons.
self ledMinus

ledO

Bitmaps := nil
Icon flushCachedIcons
self ledO

ledOff

This resource specification was automatically generated
by the ImageEditor of ST/X.

Usage example(s):

     self ledOff inspect
     ImageEditor openOnClass:self andSelector:#ledOff
     Icon flushCachedIcons

ledOffForConstruction

KEEP colormap and depth. Used to construct other bitmaps

ledP

Icon flushCachedIcons
self ledP

ledPeriod

This resource specification was automatically generated
by the ImageEditor of ST/X.

Usage example(s):

     self ledPeriod inspect
     ImageEditor openOnClass:self andSelector:#ledPeriod
     Icon flushCachedIcons

ledS

Icon flushCachedIcons
self ledS

ledZ

Icon flushCachedIcons
self ledZ

ledb

Icon flushCachedIcons.
self ledb

ledd

Icon flushCachedIcons.
self ledd

ledh

Icon flushCachedIcons
self ledh

ledm

Icon flushCachedIcons.
self ledm

ledn

Icon flushCachedIcons
self ledn

ledo

Icon flushCachedIcons.
self ledo

ledq

Icon flushCachedIcons.
self ledq

ledr

Icon flushCachedIcons.
self ledr

ledt

Icon flushCachedIcons
self ledt

ledu

Icon flushCachedIcons
self ledu

ledv

Icon flushCachedIcons
self ledv

ledw

Icon flushCachedIcons.
self ledw

ledy

Icon flushCachedIcons
self ledy

segmentA

KEEP colormap and depth. Used to construct other bitmaps

segmentB

KEEP colormap and depth. Used to construct other bitmaps

segmentC

KEEP colormap and depth. Used to construct other bitmaps

segmentD

KEEP colormap and depth. Used to construct other bitmaps

segmentE

KEEP colormap and depth. Used to construct other bitmaps

segmentF

KEEP colormap and depth. Used to construct other bitmaps

segmentG

KEEP colormap and depth. Used to construct other bitmaps

initialization

bitmapFor: aCharacter: Bitmaps := nil
self bitmapFor:$a
self bitmapFor:$Y
self bitmapFor:$y
bitmaps: marked as obsolete by demo at 03-04-2023

** This is an obsolete interface - do not use it (it may vanish in future versions) **
initBitmap: symbol

queries - plugin

aspectSelectors

Instance protocol:

accessing

numberOfDigits: return the number of digits to display
numberOfDigits: n: specify the number of digits to display
numberScale: return the number of post-decimal-point digits
numberScale: n: define the number of post-decimal-point digits
radix: return the number radix;
2..16 are supported; 10 is the default
radix: tenOrSixteen: set the number radix;
2..16 are supported; 10 is the default
showLeadingZeros: return true if leading zeros are shown
showLeadingZeros: aBoolean: controls if leading zeros are shown

accessing channels

ledColorChannel
ledColorChannel: aValueHolder

accessing-color & font

foregroundColor: aColor: change the led's color

change & update

update: something with: aParameter from: changedObject: redraw myself, when the model changes

drawing

redrawX: rx y: ry width: rw height: rh: update my view

events

sizeChanged: how from: oldExtentOrNil: my view has changed the size (not the contents)

initialization

fetchDeviceResources: fetch device colors, to avoid reallocation at redraw time
initialize: (comment from inherited method)
must be called if redefined

queries

computePreferredExtent: (comment from inherited method)
return my computed preferred extent - this is the minimum size I would like to have.
If there are any components, a rectangle enclosing them
is returned. Otherwise, the actual extent is returned.

Examples:

displaying integers:

  |top leds valueHolder|

  top := StandardSystemView extent:200@200.
  leds := DigitalLedDisplay origin:0.0@0.0 corner:1.0@30 in:top.
  leds model:(valueHolder := 12345 asValue).
  top openAndWaitUntilVisible.

  [
      [top realized] whileTrue:[
          Delay waitForSeconds:1.
          valueHolder value:(valueHolder value + 1)
      ]
  ] fork

HEX display (integers only):

  |top leds valueHolder|

  top := StandardSystemView extent:200@200.
  leds := DigitalLedDisplay origin:0.0@0.0 corner:1.0@30 in:top.
  leds radix:16.
  leds model:(valueHolder := 12345 asValue).
  top openAndWaitUntilVisible.

  [
      [top realized] whileTrue:[
          Delay waitForSeconds:1.
          valueHolder value:(valueHolder value + 1)
      ]
  ] fork

binary display (integers only):

  |top leds valueHolder|

  top := StandardSystemView extent:200@200.
  leds := DigitalLedDisplay origin:0.0@0.0 corner:1.0@30 in:top.
  leds radix:2.
  leds model:(valueHolder := 345 asValue).
  top openAndWaitUntilVisible.

  [
      [top realized] whileTrue:[
          Delay waitForSeconds:1.
          valueHolder value:(valueHolder value + 1)
      ]
  ] fork

octal display (integers only):

  |top leds valueHolder|

  top := StandardSystemView extent:200@200.
  leds := DigitalLedDisplay origin:0.0@0.0 corner:1.0@30 in:top.
  leds radix:8.
  leds model:(valueHolder := 345 asValue).
  top openAndWaitUntilVisible.

  [
      [top realized] whileTrue:[
          Delay waitForSeconds:1.
          valueHolder value:(valueHolder value + 1)
      ]
  ] fork

displaying floats:

  |top leds valueHolder|

  top := StandardSystemView extent:200@200.
  leds := DigitalLedDisplay origin:0.0@0.0 corner:1.0@30 in:top.
  leds model:(valueHolder := 12345.123 asValue).
  top openAndWaitUntilVisible.

  [
      [top realized] whileTrue:[
          Delay waitForSeconds:1.
          valueHolder value:(valueHolder value + 1)
      ]
  ] fork

displaying fixedPoint numbers:

  |top leds valueHolder|

  top := StandardSystemView extent:200@200.
  leds := DigitalLedDisplay origin:0.0@0.0 corner:1.0@30 in:top.
  leds model:(valueHolder := 12345.888 asValue).
  leds numberScale:2.
  top openAndWaitUntilVisible.

  [
      [top realized] whileTrue:[
          Delay waitForSeconds:1.
          valueHolder value:(valueHolder value + 0.01)
      ]
  ] fork

scientific numbers:

  |top leds valueHolder|

  top := StandardSystemView extent:200@200.
  leds := DigitalLedDisplay origin:0.0@0.0 corner:1.0@30 in:top.
  leds model:(valueHolder := -3.1415e15 asValue).
  leds numberOfDigits:12.
  top openAndWaitUntilVisible.

  [
      [top realized] whileTrue:[
          Delay waitForSeconds:1.
          valueHolder value:(valueHolder value + 10000)
      ]
  ] fork

number too big:

  |top leds valueHolder|

  top := StandardSystemView extent:200@200.
  leds := DigitalLedDisplay origin:0.0@0.0 corner:1.0@30 in:top.
  leds model:(valueHolder := 9995 asValue).
  leds numberScale:2.
  leds numberOfDigits:4.
  top openAndWaitUntilVisible.

  [
      [top realized] whileTrue:[
          Delay waitForSeconds:1.
          valueHolder value:(valueHolder value + 1)
      ]
  ] fork

changing the color (above 100):

  |top leds valueHolder|

  top := StandardSystemView extent:200@200.
  leds := DigitalLedDisplay origin:0.0@0.0 corner:1.0@30 in:top.
  leds model:(valueHolder := 95 asValue).
  leds numberScale:2.
  leds numberOfDigits:4.
  leds foregroundColor:Color green.
  top openAndWaitUntilVisible.

  [
      [top realized] whileTrue:[
          Delay waitForSeconds:1.
          valueHolder value:(valueHolder value + 1).
          valueHolder value >= 100 ifTrue:[
              leds foregroundColor:Color red.
          ]
      ]
  ] fork

displaying strings:

  |top leds valueHolder|

  top := StandardSystemView extent:200@200.
  leds := DigitalLedDisplay origin:0.0@0.0 corner:1.0@30 in:top.
  leds model:(valueHolder := Time now printString asValue).
  top openAndWaitUntilVisible.

displaying strings:

  |top leds valueHolder|

  top := StandardSystemView extent:200@200.
  leds := DigitalLedDisplay origin:0.0@0.0 corner:1.0@30 in:top.
  leds model:(valueHolder := ' ' asValue).
  top openAndWaitUntilVisible.

  [
      [:exit |
          #('AAAAA'
            'bbbbb'
            'CCCCC'
            'ddddd'
            'EEEEE'
            'FFFFF'
            'uuuuu'
            'PPPPP'
            'rrrrr'
            'ooooo'
          ) do:[:s |
              top realized ifFalse:[exit value:nil].
              valueHolder value:s.
              Delay waitForSeconds:1.
          ]
      ] loopWithExit.
  ] fork

animated string:

  |top leds valueHolder|

  Bitmaps := nil.
  top := StandardSystemView extent:200@200.
  leds := DigitalLedDisplay origin:0.0@0.0 corner:1.0@30 in:top.
  leds model:(valueHolder := ' ' asValue).
  top openAndWaitUntilVisible.

  [
      |s d i|

      s := 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ'.
      i := 1.
      [:exit |
          d := (s, s) copyFrom:i count:(s size).
          top realized ifFalse:[exit value:nil].
          valueHolder value:d.
          Delay waitForSeconds:1.
          i := i + 1.
          i >= s size ifTrue:[ i := 1 ].
      ] loopWithExit.
  ] fork

  |top leds valueHolder text|

  text := ' Hello : open : close : play : shuffle : no disc : start : stop : run : fail : error : setup : help : on : off : yes : no : hot : cold : '.
  
  top := StandardSystemView extent:200@200.
  leds := DigitalLedDisplay origin:0.0@0.0 corner:1.0@30 in:top.
  leds numberOfDigits:10.
  leds model:(valueHolder := '' asValue).
  top openAndWaitUntilVisible.

  [
      [:exit |
          1 to:text size do:[:start |
              |subString|

              subString := (text,text) copyFrom:start to:start+9.
              top realized ifFalse:[exit value:nil].
              valueHolder value:subString.
              Delay waitForSeconds:0.25.
          ]
      ] loopWithExit.
  ] fork

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