mcopy/app/display.html

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<!doctype html>
<html>
<head>
<title>display</title>
<style>
body{
background: #000;
padding: 0;
margin: 0;
max-width: 100%;
max-height: 100vh;
}
body.meter {
background: rgb(117, 117, 117);
}
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body.meter #img,
body.meter #can {
display: none;
}
body.image #can{
display: none;
}
body.image #img {
display: block;
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}
#img {
position: absolute;
/*background-image: url(".../img/background.jpg");*/
background-repeat:no-repeat;
background-size: contain;
background-position: center;
top: 0;
left: 0;
right: 0;
bottom: 0;
}
#can{
margin: 0;
background: #fff;
display: none;
position: fixed;
left: 50%;
top: 50%;
transform: translate(-50%,-50%);
}
#can.show{
display: block;
}
</style>
</head>
<body>
<div id="img">
</div>
<canvas id="can">
</canvas>
<script>
'use strict';
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const { ipcRenderer } = require('electron')
const remote = require('@electron/remote')
let imgTmp;
function delay (ms) {
return new Promise((resolve) => {
return setTimeout(resolve, ms)
})
}
async function setImage (src) {
return new Promise(async (resolve, reject) => {
imgTmp = new Image()
let img = document.getElementById('img')
let body = document.querySelector('body')
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body.className = ''
body.classList.add('image')
imgTmp.onload = function () {
img.style.backgroundImage = `url('${src}')`
return resolve(src)
}
imgTmp.src = src
})
}
function setBlank () {
let img = document.getElementById('img')
img.style.background = ''
img.style.backgroundUrl = ''
img.style.backgroundColor = 'black'
}
async function onMeter () {
console.log('meter')
const body = document.querySelector('body')
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body.className = ''
body.classList.add('meter')
}
async function onFocus () {
console.log('focus')
const can = document.getElementById('can')
const dpr = window.devicePixelRatio || 1
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const body = document.querySelector('body')
let ctx;
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body.className = ''
if (!can.classList.contains('show')) {
can.classList.add('show')
}
can.width = window.innerWidth * dpr
can.height = window.innerHeight * dpr
can.style.width = `${window.innerWidth}px`
can.style.height = `${window.innerHeight}px`
ctx = can.getContext('2d')
ctx.scale(dpr, dpr)
try{
await drawFocus(can, ctx)
} catch (err) {
alert(JSON.stringify(err))
}
}
async function drawFocus (can, ctx) {
const count = 20
const half = Math.round(count / 2)
const dpr = window.devicePixelRatio || 1
const w = can.width / dpr
const h = can.height / dpr
const longest = w >= h ? w * 1.5 : h * 1.5
const opp = Math.tan(360 / (count * 32)) * longest / 10
//console.log(`l: ${longest}`)
//console.log(`${360 / (count * 8)}deg`)
//console.log(`o: ${opp}`)
for (let i = 0; i < count; i++) {
ctx.beginPath()
ctx.moveTo(w / 2, h / 2)
ctx.lineTo((w / 2) + opp, longest)
ctx.lineTo((w / 2) - opp, longest)
ctx.fill()
ctx.translate(w / 2, h / 2);
ctx.rotate((360 / count) * Math.PI / 180)
ctx.translate(- w / 2, -h / 2)
}
}
async function onField (evt, arg) {
console.log('field guide')
const can = document.getElementById('can')
const dpr = window.devicePixelRatio || 1
const screen = window.outerWidth / window.outerHeight
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const body = document.querySelector('body')
let ctx
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body.className = ''
if (!can.classList.contains('show')) {
can.classList.add('show')
}
if (arg.ratio) {
if (arg.ratio < screen) {
can.width = (window.innerHeight * arg.ratio) * dpr
can.height = window.innerHeight * dpr
} else {
can.width = window.innerWidth * dpr
can.height = (window.innerWidth / arg.ratio) * dpr
}
} else {
can.width = window.innerWidth * dpr
can.height = window.innerHeight * dpr
}
if (arg.ratio) {
if (arg.ratio < screen) {
can.style.width = `${window.innerHeight * arg.ratio}px`
can.style.height = `${window.innerHeight}px`
} else {
can.style.width = `${window.innerWidth}px`
can.style.height = `${window.innerWidth / arg.ratio}px`
}
} else {
can.style.width = `${window.innerWidth}px`
can.style.height = `${window.innerHeight}px`
}
ctx = can.getContext('2d')
ctx.scale(dpr, dpr)
try{
await drawField(can, ctx)
} catch (err) {
alert(JSON.stringify(err))
}
}
// draw a field guide
async function drawField (can, ctx) {
const count = 20
const half = Math.round(count / 2)
const dpr = window.devicePixelRatio || 1
const w = can.width / dpr
const h = can.height / dpr
const wsec = w / count
const hsec = h / count
const spacer = 12
const fontSize = 18
ctx.lineWidth = 2
ctx.moveTo(w / 2, 0)
ctx.lineTo(w / 2, h)
ctx.stroke()
ctx.moveTo(0, h / 2)
ctx.lineTo(w, h / 2)
ctx.stroke()
for (let i = 0; i < count; i++) {
ctx.moveTo(wsec * i, hsec * i)
ctx.lineTo(wsec * i, h - (hsec * i))
ctx.stroke()
ctx.moveTo(wsec * i, hsec * i)
ctx.lineTo(w - (wsec * i), hsec * i)
ctx.stroke()
}
ctx.lineWidth = 1
ctx.font = `${fontSize}px Arial`
for (let i = 0; i < half; i++) {
//left count
ctx.fillText(`${(half - i)}`, (wsec * i) + spacer, (h / 2) - spacer)
//right count
ctx.fillText(`${(half - i)}`, (w - (wsec * i)) - (spacer * 2), (h / 2) + (spacer * 2))
//up count
ctx.fillText(`${(half - i)}`, (w / 2) + spacer, (hsec * i) + spacer + (fontSize / 2) )
//down count
ctx.fillText(`${(half - i)}`, (w / 2) - (spacer * 2), (h - (hsec * i)) - spacer)
}
}
async function onDigital (event, arg) {
if (arg.src) {
if (arg.exposure) {
setBlank()
await delay(10)
}
try {
await setImage(arg.src)
} catch (err) {
console.error(err)
}
if (arg.exposure) {
await delay(arg.exposure)
setBlank()
}
ipcRenderer.send('display_load', { src : arg.src })
}
return event.returnValue = true
}
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async function onEscape (evt) {
let isEscape = false
let win
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evt = evt || window.event
if ('key' in evt) {
isEscape = (evt.key == 'Escape' || evt.key == 'Esc')
} else {
isEscape = (evt.keyCode == 27)
}
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if (isEscape) {
win = remote.getCurrentWindow()
win.close()
}
}
ipcRenderer.on('display', onDigital)
ipcRenderer.on('field', onField)
ipcRenderer.on('meter', onMeter)
ipcRenderer.on('focus', onFocus)
document.onkeydown = onEscape
</script>
</body>
</html>