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problems.html
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<!DOCTYPE html>
<html lang="en" dir="ltr">
<head>
<meta charset="utf-8">
<title></title>
<style media="screen">
:root {--bg:#fff;--fg:#000;}
@media (prefers-color-scheme:dark) {:root {--bg:#202124;--fg:#f1f3f4;}}
body, body * {background:var(--bg); color:var(--fg);}
div.input input { width:4em; }
div.error { color:red; }
svg {margin: 2em; stroke:var(--fg); border:1px solid #777}
</style>
</head>
<body>
<div class="input">
<form onsubmit="return openFromInput()">
spec/problems/<input type="text" id="pid"/><button>Open</button>
</form>
</div>
<div class="error">
<span id="err"></span>
</div>
<div class="problem">
<div id="gfx">
</div>
</div>
<script type="text/javascript" src="trig/js/svg.min.js"></script>
<script type="text/javascript">
function renderProblem(problem) {
let el = document.getElementById('err')
el.innerText = ''
document.getElementById('gfx').innerHTML = ''
let draw = SVG().addTo('#gfx').size(400, 400)
let w = Math.ceil(Math.max(...problem.hole.flat().concat(problem.figure.vertices.flat())) / 10) * 10
draw.viewbox(0, 0, w, w)
let hole = draw.group()
hole.polygon(problem.hole)
const figcolor = '#f0f'
let fig = draw.group()
let vs = problem.figure.vertices
for (const [x,y] of vs) {
let c = fig.circle(1).center(x, y)
c.fill(figcolor).stroke(figcolor)
}
for (const [a,b] of problem.figure.edges) {
let pa = vs[a]
let pb = vs[b]
let c = fig.line(...pa, ...pb)
c.stroke(figcolor)
}
}
function renderError(err) {
document.getElementById('gfx').innerHTML = ''
let el = document.getElementById('err')
el.innerText = err
}
function openFromInput() {
let pid = document.getElementById('pid').value.trim()
fetch('spec/problems/' + pid + '.json')
.then(r => r.json())
.then(data => renderProblem(data))
.catch(err => renderError(err))
return false
}
</script>
</body>
</html>