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check-position
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<!DOCTYPE html> | |
<html lang="en"> | |
<head> | |
<meta charset="UTF-8"> | |
<meta name="viewport" content="width=device-width, initial-scale=1.0"> | |
<meta http-equiv="X-UA-Compatible" content="ie=edge"> | |
<title>+ position</title> | |
<script src="main.js" defer></script> | |
<style> | |
body { | |
margin: 0; | |
} | |
* { | |
box-sizing: border-box; | |
} | |
.box { | |
position: relative; | |
display: flex; | |
height: 90vh; | |
align-items: center; | |
justify-content: center; | |
overflow: hidden; | |
box-shadow: inset 0 0 0 10px; | |
} | |
.box::after { | |
content: 'update: ' attr(data-update); | |
position: absolute; | |
right: 1em; | |
bottom: 1em; | |
} | |
.img { | |
position: relative; | |
font-size: 256px; | |
width: 1em; | |
height: 1em; | |
margin: 0 auto; | |
background-position: 50% 50%; | |
background-repeat: no-repeat; | |
background-image: url('./lyrs=m&x=54899&y=28054&z=16.png'); | |
} | |
.img[data-checking] { | |
box-shadow: 0 0 0 3px; | |
} | |
.img[data-checking]::after { | |
content: 'checking...'; | |
position: absolute; | |
top: 0; | |
font-size: 1rem; | |
} | |
.img::before { | |
content: ''; | |
position: absolute; | |
top: var(--yp, 90%); | |
left: var(--xp, 70%); | |
width: var(--size, .5em); | |
height: var(--size, .5em); | |
transform: translate(-50%, -50%); | |
box-shadow: inset 0 0 .25em 2px; | |
border-radius: 50%; | |
color: #999; | |
pointer-events: none; | |
background-image: | |
linear-gradient(currentColor, currentColor), | |
linear-gradient(currentColor, currentColor); | |
background-size: 50% 3px, 3px 50%; | |
background-position: 50% 50%; | |
background-repeat: no-repeat; | |
} | |
</style> | |
</head> | |
<body> | |
<div class="box"> | |
<div class="img"></div> | |
</div> | |
</body> | |
</html> |
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let checkPosition = () => { | |
console.log('checkPosition'); | |
navigator.geolocation.getCurrentPosition((e) => { | |
setPosition(e.coords); | |
img.checker = setTimeout(() => { | |
checkPosition(); | |
}, (e.coords.accuracy < 100 ) ? 500 : 30000 ); | |
}); | |
}; | |
let p1 = [25.055554, 121.569250]; | |
let p2 = [25.050949, 121.574685]; | |
let imgW = 550; | |
let box = document.querySelector('.box'); | |
let img = document.querySelector('.img'); | |
let setPosition = (coords) => { | |
console.log('accuracy', coords.accuracy); | |
let xp = (coords.latitude - p1[0]) / (p2[0] - p1[0]); | |
let yp = (coords.longitude - p1[1]) / (p2[1] - p1[1]); | |
console.log({xp, yp}); | |
img.style.setProperty('--xp', `${xp * 100}%`); | |
img.style.setProperty('--yp', `${yp * 100}%`); | |
img.style.setProperty('--size', `${(coords.accuracy / imgW)}em`); | |
box.dataset.update = new Date().toLocaleTimeString(); | |
}; | |
img.addEventListener('click', () => { | |
if (!img.dataset.checking) { | |
img.dataset.checking = true; | |
checkPosition(); | |
} else { | |
delete img.dataset.checking; | |
clearTimeout(img.checker); | |
} | |
}); |
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