Warning, /education/gcompris/src/activities/digital_electricity/components/BCDToSevenSegment.qml is written in an unsupported language. File is not indexed.

 /* GCompris - BCDToSevenSegment.qml
  *
  * SPDX-FileCopyrightText: 2016 Pulkit Gupta <pulkitnsit@gmail.com>
  *
  * Authors:
  *   Bruno Coudoin <bruno.coudoin@gcompris.net> (GTK+ version)
  *   Pulkit Gupta <pulkitnsit@gmail.com> (Qt Quick port)
  *
  *   SPDX-License-Identifier: GPL-3.0-or-later
  */
 import QtQuick 2.12
 import "../digital_electricity.js" as Activity
 
 import GCompris 1.0
 
 ElectricalComponent {
     id: bcdTo7Segment
     terminalSize: 0.125
     noOfInputs: 4
     noOfOutputs: 7
 
     property var inputTerminalPosY: [0.125, 0.375, 0.625, 0.875]
     property var outputTerminalPosY: [0.066, 0.211, 0.355, 0.5, 0.645, 0.789, 0.934]
 
     property var redChar: ["BCDTo7SegmentA_on.svg","BCDTo7SegmentB_on.svg","BCDTo7SegmentC_on.svg",
                                "BCDTo7SegmentD_on.svg","BCDTo7SegmentE_on.svg","BCDTo7SegmentF_on.svg",
                                "BCDTo7SegmentG_on.svg"]
 
     information: qsTr("A BCD to 7 segment converter takes 4 binary inputs " +
                       "and gives 7 binary outputs which allow to light BCD number segments (binary-coded decimal) " +
                       "to display numbers between 0 and 9. The output for a BCD To 7 Segment converter is:")
 
     truthTable: [['D','C','B','A','a','b','c','d','e','f','g'],
                  ['0','0','0','0','1','1','1','1','1','1','0'],
                  ['0','0','0','1','0','1','1','0','0','0','0'],
                  ['0','0','1','0','1','1','0','1','1','0','1'],
                  ['0','0','1','1','1','1','1','1','0','0','1'],
                  ['0','1','0','0','0','1','1','0','0','1','1'],
                  ['0','1','0','1','1','0','1','1','0','1','1'],
                  ['0','1','1','0','1','0','1','1','1','1','1'],
                  ['0','1','1','1','1','1','1','0','0','0','0'],
                  ['1','0','0','0','1','1','1','1','1','1','1'],
                  ['1','0','0','1','1','1','1','1','0','1','1']]
 
     property alias inputTerminals: inputTerminals
     property alias outputTerminals: outputTerminals
 
     Repeater {
         id: inputTerminals
         model: 4
         delegate: inputTerminal
         Component {
             id: inputTerminal
             TerminalPoint {
                 posX: 0.05
                 posY: inputTerminalPosY[index]
                 type: "In"
             }
         }
     }
 
     Repeater {
         id: outputTerminals
         model: 7
         delegate: outputTerminal
         Component {
             id: outputTerminal
             TerminalPoint {
                 posX: 0.95
                 posY: outputTerminalPosY[index]
                 type: "Out"
             }
         }
     }
 
     function updateOutput(wireVisited) {
         var i
         for(i = 1 ; i < truthTable.length ; ++i) {
             var j
             for(j = 0 ; j < noOfInputs; ++j) {
                 if(inputTerminals.itemAt(j).value != truthTable[i][j])
                     break
             }
             if(j == noOfInputs)
                 break
         }
         if(i == truthTable.length) {
             for(var j = 0 ; j < noOfOutputs ; ++j) {
                 outputTerminals.itemAt(j).value = 0
                 outputChar.itemAt(j).source = "qrc:/gcompris/src/core/resource/empty.svg"
             }
         }
         else {
             for(var j = 0 ; j < noOfOutputs ; ++j) {
                 var terminal = outputTerminals.itemAt(j)
                 terminal.value = truthTable[i][j + noOfInputs]
                 outputChar.itemAt(j).source = (terminal.value == 0 ? "qrc:/gcompris/src/core/resource/empty.svg" : Activity.url + redChar[j])
             }
         }
 
         for(var i = 0 ; i < noOfOutputs ; ++i) {
             var terminal = outputTerminals.itemAt(i)
             for(var j = 0 ; j < terminal.wires.length ; ++j)
                 terminal.wires[j].to.value = terminal.value
         }
 
         var componentVisited = []
         for(var i = 0 ; i < noOfOutputs ; ++i) {
             var terminal = outputTerminals.itemAt(i)
             for(var j = 0 ; j < terminal.wires.length ; ++j) {
                 var wire = terminal.wires[j]
                 var component = wire.to.parent
                 if(componentVisited[component] != true && wireVisited[wire] != true) {
                     componentVisited[component] = true
                     wireVisited[wire] = true
                     component.updateOutput(wireVisited)
                 }
             }
         }
     }
 
     Repeater {
         id: outputChar
         model: 7
         delegate: outputCharImages
         Component {
             id: outputCharImages
             Image {
                 source: ""
                 anchors.centerIn: parent
                 height: parent.height
                 width: parent.width
                 fillMode: Image.PreserveAspectFit
                 mipmap: true
                 antialiasing: true
             }
         }
     }
 }