2024-06-25 11:21:25 +02:00
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<!DOCTYPE html>
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2024-06-25 11:19:53 +02:00
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<html lang="fr">
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2024-06-25 11:21:25 +02:00
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<head>
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<meta charset="utf-8" />
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<meta name="viewport" content="width=device-width, initial-scale=1.0" />
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<title>Contrôle du robot</title>
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</head>
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<body>
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<h1>Contrôle du robot sans fils</h1>
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<p>
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Cette page permet de contrôler le robot depuis un PC portable
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connecté au WiFi du robot. Elle est destinée aux personnes n'ayant
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pas de smartphone.
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</p>
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<h2>Paramètres de contrôle</h2>
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<p>
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Ici vous pourrez paramétrer les contrôles du robot, rentrer son
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adresse IP ainsi que lui indiquer la distance à parcourir ou l'angle
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de rotation désiré.
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</p>
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<form class="settings" id="settings">
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<label>
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<span>Adresse IP du robot</span>
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<input
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type="text"
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name="ip-address"
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title="Adresse IP du robot (ex: 192.168.0.1)"
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pattern="\d+\.\d+\.\d+\.\d+"
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placeholder="192.168.0.0"
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required
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/>
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</label>
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<button>Se connecter</button>
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</form>
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<div class="controls">
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<label>
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<span>Rotation en degrés</span>
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<input
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id="rotate-input"
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type="number"
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title="Rotation en degrés (-360° à 360°)"
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min="-360"
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max="360"
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step="1"
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placeholder="90"
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/>
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</label>
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<label>
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<span>Distance en cm</span>
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<input
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id="move-input"
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type="number"
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title="Distance en cm (-2^31 à 2^31)"
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min="-2147483647"
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step="1"
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max="2147483647"
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placeholder="10"
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/>
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</label>
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</div>
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<h2>Contrôle</h2>
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<p>
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Amusez vous ! Pour contrôler le robot, utilisez les flèches
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directionnelles pour le diriger et la barre espace pour le stopper.
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</p>
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</body>
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<script type="module">
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// Input handlers
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document
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.querySelector('#move-input')
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.addEventListener('change', (event) =>
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assignCommands('backward', 'forward', event)
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)
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document
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.querySelector('#rotate-input')
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.addEventListener('change', (event) =>
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assignCommands('left', 'right', event)
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)
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// Keyboard handler
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document.addEventListener('keydown', ({ code }) => {
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if (code === 'ArrowUp') {
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return sendCommand('forward', 2)
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}
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if (code === 'ArrowDown') {
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return sendCommand('backward', 2)
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}
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if (code === 'ArrowLeft') {
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return sendCommand('left', 5)
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}
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if (code === 'ArrowRight') {
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return sendCommand('right', 5)
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}
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if (code === 'Space') {
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return sendCommand('stop', 0)
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}
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})
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// Settings handler
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document
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.querySelector('#settings')
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.addEventListener('submit', async (event) => {
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// Don't interrupt event if not form submitting
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if (!(event instanceof SubmitEvent)) return true
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if (event.target === null) return true
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// Disable form sending
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event.preventDefault()
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const form = new FormData(event.target)
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const ipAddress = form.get('ip-address')
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if (ipAddress === null) return
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const endpoint = `http://${ipAddress}`
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await testEndpoint(endpoint)
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setEndpoint(endpoint)
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})
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2024-06-25 12:27:16 +02:00
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/**
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* A command string.
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* @typedef {('forward' | 'backward' | 'left' | 'right' | 'stop')} Command
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*/
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/**
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* Send command to the robot.
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*
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* @param {Command} command Command to send.
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* @param {number} value Value of the command if needed.
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*
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* @returns {Promise<void>}
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*/
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async function sendCommand(command, value) {
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const endpoint = getEndpoint()
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const url = new URL(
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`/get?command=${command}&value=${value}`,
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endpoint
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)
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const response = await fetch(url)
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const text = await response.text()
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console.log(text)
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}
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2024-06-25 12:46:11 +02:00
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/**
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* Get robot endpoint address.
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*
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* @returns {string}
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*/
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function getEndpoint() {
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const endpoint = sessionStorage.getItem('robot-endpoint')
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if (endpoint === null) {
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alert("Aucune adresse IP n'a été renseignée !")
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throw new Error('no given ip address')
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}
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return endpoint
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}
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/**
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* Set robot endpoint address.
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*
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* @param {string} ip Robot ip.
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*
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* @returns void
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*/
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function setEndpoint(ip) {
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sessionStorage.setItem('robot-endpoint', ip)
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}
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2024-06-25 12:58:11 +02:00
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/**
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* Test connection to endpoint.
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*
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* @param {string} endpoint Endpoint to test for.
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*
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* @returns {void}
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* @throws {Error} Endpoint unreachable.
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*/
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async function testEndpoint(endpoint) {
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try {
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const response = await fetch(endpoint)
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if (response.ok) return
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} catch (cause) {
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alert(`Impossible de joindre l'adresse "${endpoint}"`)
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throw new Error(`unable to connect to robot at ${endpoint}`, {
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cause,
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})
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}
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}
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/**
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* Assign a command to an input.
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* Do negative command if value < 0 else do positive command.
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*
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* @param {Command} negativeCommand Command if value < 0.
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* @param {Command} positiveCommand Command if value >= 0.
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* @param {event} event Event of the input.
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*
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* @returns {Promise<void>}
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*/
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function assignCommands(negativeCommand, positiveCommand, event) {
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if (event.target === null) return
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/** @type {HTMLInputElement} */
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const target = event.target
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const value = target.valueAsNumber
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if (value < 0) {
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return sendCommand(negativeCommand, Math.abs(value))
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}
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return sendCommand(positiveCommand, value)
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}
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</script>
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</html>
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