128 lines
3.1 KiB
JavaScript
128 lines
3.1 KiB
JavaScript
function resize() {
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let bodyWidth = window.innerWidth
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let maxWidth = Math.min(bodyWidth - 60, 800)
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let bodyHeight = window.innerHeight
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let maxHeight = Math.min(bodyHeight - 60, 480)
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let equivalentHeight = maxWidth * 0.6
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if (equivalentHeight >= maxHeight) {
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displayHeight = Math.round(maxHeight)
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displayWidth = Math.round(maxHeight * (5/3))
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} else {
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displayWidth = Math.round(maxWidth)
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displayHeight = Math.round(maxWidth * 0.6)
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}
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canvas.style.width = displayWidth + 'px'
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canvas.style.height = displayHeight + 'px'
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errorbox.style.width = displayWidth + 'px'
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errorbox.style.height = displayHeight + 'px'
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}
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function setup() {
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ws = new WebSocket(localStorage.getItem('url'))
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ws.onmessage = function(e) {
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window.m = e
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let type, pos, x, y, data, img, code, msg
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type = e.data.split('%')[0]
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if ( type == 'pic' ) {
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pos = e.data.split('%')[1]
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x = Number(pos.split('x')[0])
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y = Number(pos.split('x')[1])
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data = e.data.split('%')[2]
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img = new Image()
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img.src = data
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img.addEventListener("load", function(){
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ctx.drawImage(img,x,y)
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})
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errorbox.style.display = 'none'
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canvas.style.display = 'block'
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} else if ( type == 'err' ) {
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code = e.data.split('%')[1]
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msg = e.data.split('%')[2]
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errorbox.textContent = msg
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errorbox.style.display = 'block'
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canvas.style.display = 'none'
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console.error('Server reported error: ' + code + ': ' + msg)
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if (code[0] == '*') {
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errorbox.innerHTML = msg + '<br>Please refresh page'
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ws.onclose = function(e){}
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ws.onerror = function(e){}
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}
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} else if (type == 'ack') {
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ws.send('ack')
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}
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}
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ws.onerror = function(e){
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errorbox.innerHTML = 'Connection lost<br>Please refresh page'
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errorbox.style.display = 'block'
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canvas.style.display = 'none'
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}
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ws.onclose = function(e){
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errorbox.innerHTML = 'Connection lost<br>Please refresh page'
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errorbox.style.display = 'block'
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canvas.style.display = 'none'
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}
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ws.onopen = function(e) {
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ws.send('pass ' + localStorage.getItem('password'))
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}
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setInterval(function(){ws.send('ack')}, 3000)
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}
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function touch(e) {
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click_timeout = setTimeout(function() {
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is_short = false
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}, 1000)
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is_short = true
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}
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function release(e) {
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x = e.layerX
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y = e.layerY
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w = displayWidth
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length = is_short?false:true
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ws.send('touch ' + x + ' ' + y + ' ' + w + ' ' + length)
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clearTimeout(click_timeout)
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is_short = true
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}
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function connect(e) {
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e.preventDefault()
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holder.style.display = 'block'
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login.style.display = 'none'
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localStorage.setItem('url', url_el.value)
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localStorage.setItem('password', password_el.value)
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setup()
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}
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let canvas = document.querySelector('canvas')
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let errorbox = document.querySelector('#errorbox')
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let login = document.querySelector('#login')
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let holder = document.querySelector('#holder')
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let url_el = document.querySelector('#url')
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let password_el = document.querySelector('#password')
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let start_button = document.querySelector('#start')
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let is_short = true
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let click_timeout
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let ctx = canvas.getContext("2d")
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let displayWidth, displayHeight
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let ws
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resize()
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window.onresize = resize
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canvas.onmousedown = touch
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canvas.onmouseup = release
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start.onclick = connect
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