digital_electricity/components/Zero.qml

0001 /* GCompris - Zero.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: zero
0016     terminalSize: 0.25
0017     noOfInputs: 0
0018     noOfOutputs: 1
0019
0020     information: qsTr("Digital circuits work with only two states: 0 and 1. This allows to operate mathematical operations such as additions, subtractions... It is the basics of computer technics. In reality, 0 is often the representation of a voltage nearly equal to ground voltage and 1 is the representation of the supply voltage of a circuit.")
0021
0022     property alias outputTerminals: outputTerminals
0023
0024     Repeater {
0025         id: outputTerminals
0026         model: 1
0027         delegate: outputTerminal
0028         Component {
0029             id: outputTerminal
0030             TerminalPoint {
0031                 posX: 0.9
0032                 posY: 0.5
0033                 value: 0
0034                 type: "Out"
0035             }
0036         }
0037     }
0038
0039     function updateOutput(wireVisited) {
0040         var terminal = outputTerminals.itemAt(0)
0041         for(var i = 0 ; i < terminal.wires.length ; ++i)
0042             terminal.wires[i].to.value = terminal.value
0043
0044         var componentVisited = []
0045         for(var i = 0 ; i < terminal.wires.length ; ++i) {
0046             var wire = terminal.wires[i]
0047             var component = wire.to.parent
0048             if(componentVisited[component] != true && wireVisited[wire] != true) {
0049                 componentVisited[component] = true
0050                 wireVisited[wire] = true
0051                 component.updateOutput(wireVisited)
0052             }
0053         }
0054     }
0055 }