digital_electricity/components/AndGate.qml

0001 /* GCompris - AndGate.qml
0002  *
0003  * SPDX-FileCopyrightText: 2016 Pulkit Gupta <pulkitnsit@gmail.com>
0004  *
0005  * Authors:
0006  *   Bruno Coudoin <bruno.coudoin@gcompris.net> (GTK+ version)
0007  *   Pulkit Gupta <pulkitnsit@gmail.com> (Qt Quick port)
0008  *
0009  *   SPDX-License-Identifier: GPL-3.0-or-later
0010  */
0011 import QtQuick 2.12
0012 import GCompris 1.0
0013
0014 ElectricalComponent {
0015     id: andGate
0016     terminalSize: 0.50
0017     noOfInputs: 2
0018     noOfOutputs: 1
0019     property var inputTerminalPosY: [0.2, 0.8]
0020
0021     information: qsTr("An AND gate outputs 1 only if all its inputs are equal to 1. " +
0022                       "As soon as one input is equal to 0 the result is 0. The output for a 2 inputs AND gate is:")
0023
0024     truthTable: [['A','B',qsTr("A AND B")],
0025                  ['0','0','0'],
0026                  ['0','1','0'],
0027                  ['1','0','0'],
0028                  ['1','1','1']]
0029
0030     property alias inputTerminals: inputTerminals
0031     property alias outputTerminals: outputTerminals
0032
0033     Repeater {
0034         id: inputTerminals
0035         model: 2
0036         delegate: inputTerminal
0037         Component {
0038             id: inputTerminal
0039             TerminalPoint {
0040                 posX: 0.04
0041                 posY: inputTerminalPosY[index]
0042                 type: "In"
0043             }
0044         }
0045     }
0046
0047     Repeater {
0048         id: outputTerminals
0049         model: 1
0050         delegate: outputTerminal
0051         Component {
0052             id: outputTerminal
0053             TerminalPoint {
0054                 posX: 0.96
0055                 posY: 0.5
0056                 type: "Out"
0057             }
0058         }
0059     }
0060
0061     function updateOutput(wireVisited) {
0062         var terminal = outputTerminals.itemAt(0)
0063         /* Keep the output value == 0 if only one of the input terminals is connected */
0064         terminal.value = (inputTerminals.itemAt(0).wires.length != 0 && inputTerminals.itemAt(1).wires.length != 0) ? (inputTerminals.itemAt(0).value & inputTerminals.itemAt(1).value) : 0
0065         for(var i = 0 ; i < terminal.wires.length ; ++i)
0066             terminal.wires[i].to.value = terminal.value
0067
0068         var componentVisited = []
0069         for(var i = 0 ; i < terminal.wires.length ; ++i) {
0070             var wire = terminal.wires[i]
0071             var component = wire.to.parent
0072             componentVisited[component] = true
0073             wireVisited[wire] = true
0074             component.updateOutput(wireVisited)
0075         }
0076     }
0077 }