hcra/client.html

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2021-06-15 12:50:51 -07:00
<!DOCTYPE html>
<html>
<head>
<title>HamClock</title>
<style>
body {
background-color: black;
}
#errorbox {
color: white;
font-family: sans-serif;
font-size: 200%;
text-align: center
}
#holder {
margin: 0;
padding: 0;
width: 100vw;
height: 100vh;
text-align: center
}
#holder * {
margin: 0 auto;
position: absolute;
top: 50%;
left: 50%;
transform: translate(-50%, -50%);
}
</style>
</head>
<body>
<div id=login>
<h1>HamClock Remote Access</h1>
<form>
<label for=url>Server URL:</label><input name=url id=url><br>
<label for=password>Password:</label><input name=password id=password>
<button id=start>Start</button>
</form>
</div>
<div id=holder style="display:none">
<div id=errorbox style="width: 800px; height: 480px">Loading...</div>
<canvas id=canvas width=800 height=480 style="width: 800px; height: 480px; display: none"></canvas>
</div>
<script>
let canvas = document.querySelector('canvas')
let errorbox = document.querySelector('#errorbox')
let login = document.querySelector('#login')
let holder = document.querySelector('#holder')
let url_el = document.querySelector('#url')
let password_el = document.querySelector('#password')
let start_button = document.querySelector('#start')
let displayWidth, displayHeight
function resize() {
let bodyWidth = window.innerWidth
let maxWidth = Math.min(bodyWidth - 60, 800)
let bodyHeight = window.innerHeight
let maxHeight = Math.min(bodyHeight - 60, 480)
let equivalentHeight = maxWidth * 0.6
if (equivalentHeight >= maxHeight) {
displayHeight = Math.round(maxHeight)
displayWidth = Math.round(maxHeight * (5/3))
} else {
displayWidth = Math.round(maxWidth)
displayHeight = Math.round(maxWidth * 0.6)
}
canvas.style.width = displayWidth + 'px'
canvas.style.height = displayHeight + 'px'
//canvas.style.marginTop = '-' + displayHeight/2 + 'px'
errorbox.style.width = displayWidth + 'px'
errorbox.style.height = displayHeight + 'px'
//errorbox.style.marginTop = '-' + displayHeight/2 + 'px'
}
resize()
window.onresize = resize
let ctx = canvas.getContext("2d")
canvas.addEventListener('click', function (e) {
x = e.layerX
y = e.layerY
w = displayWidth
ws.send(localStorage.getItem('password') + ' ' + x + ' ' + y + ' ' + w)
})
let ws
function setup() {
ws = new WebSocket(localStorage.getItem('url'))
ws.onmessage = function(e) {
let type, pos, x, y, data, img, code, msg
type = e.data.split('%')[0]
if ( type == 'pic' ) {
pos = e.data.split('%')[1]
x = Number(pos.split('x')[0])
y = Number(pos.split('x')[1])
data = e.data.split('%')[2]
img = new Image()
img.src = data
img.addEventListener("load", function(){
ctx.drawImage(img,x,y)
})
errorbox.style.display = 'none'
canvas.style.display = 'block'
} else if ( type == 'err' ) {
code = e.data.split('%')[1]
msg = e.data.split('%')[2]
errorbox.textContent = msg
errorbox.style.display = 'block'
canvas.style.display = 'none'
console.error('Server reported error: ' + code + ': ' + msg)
}
}
ws.onerror = setup
ws.onclose = setup
}
start.onclick = function(e) {
e.preventDefault()
holder.style.display = 'block'
login.style.display = 'none'
localStorage.setItem('url', url_el.value)
localStorage.setItem('password', password_el.value)
setup()
}
</script>
</body>
</html>