<!DOCTYPE html>
<html lang="ja">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<link rel="stylesheet" href="leaflet.css" />
<script src="leaflet.js"></script>
<script src="https://unpkg.com/leaflet-geometryutil@0.10.1/src/leaflet.geometryutil.js"></script>
<title>酒田市面積計算ゲーム</title>
<style>
body {
margin: 0;
font-family: Arial, sans-serif;
display: flex;
flex-direction: column;
height: 100vh;
}
#map {
flex-grow: 1;
}
#controls {
background: #f8f9fa;
padding: 10px;
box-shadow: 0 2px 5px rgba(0,0,0,0.1);
z-index: 1000;
}
#info, #count {
margin-bottom: 10px;
font-size: 16px;
}
#calculateButton {
padding: 10px 20px;
background-color: #007bff;
color: white;
border: none;
border-radius: 5px;
cursor: pointer;
font-size: 16px;
}
#calculateButton:hover {
background-color: #0056b3;
}
</style>
</head>
<body>
<div id="controls">
<div id="info">現在の面積: 0 平方メートル</div>
<div id="count">計算回数: 0</div>
<button id="calculateButton">面積を計算</button>
</div>
<div id="map"></div>
<script>
const map = L.map('map').setView([38.25, 139.83], 8);
L.tileLayer('https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png', {
maxZoom: 19,
attribution: '© OpenStreetMap'
}).addTo(map);
const markers = [];
let polyline;
let polygon;
let calculationCount = 0;
map.on('click', function(e) {
const marker = L.marker(e.latlng).addTo(map);
markers.push(e.latlng);
if (markers.length > 1) {
updatePolygon();
}
marker.on('click', function() {
map.removeLayer(marker);
markers.splice(markers.indexOf(e.latlng), 1);
updatePolygon();
});
});
document.getElementById('calculateButton').addEventListener('click', calculateArea);
function updatePolygon() {
if (polyline) map.removeLayer(polyline);
if (polygon) map.removeLayer(polygon);
const latlngs = markers.map(latlng => [latlng.lat, latlng.lng]);
if (markers.length > 1) {
polyline = L.polyline(latlngs.concat([latlngs[0]]), { color: 'blue' }).addTo(map);
}
if (markers.length > 2) {
polygon = L.polygon(latlngs, { color: 'blue', fillColor: 'rgba(0, 0, 255, 0.3)', fillOpacity: 0.5 }).addTo(map);
}
}
function calculateArea() {
if (markers.length < 3) {
alert("3つ以上のポイントが必要です。");
return;
}
const latlngs = markers.map(latlng => [latlng.lat, latlng.lng]);
const area = L.GeometryUtil.geodesicArea(latlngs);
const areaInSquareMeters = Math.round(area);
document.getElementById('info').innerText = `現在の面積: ${areaInSquareMeters} 平方メートル`;
calculationCount++;
document.getElementById('count').innerText = `計算回数: ${calculationCount}`;
if (areaInSquareMeters >= 602980000) {
alert("クリア! 酒田市の面積に到達しました！");
resetMap();
}
}
function resetMap() {
markers.forEach(marker => map.removeLayer(marker));
markers.length = 0;
if (polyline) map.removeLayer(polyline);
if (polygon) map.removeLayer(polygon);
document.getElementById('info').innerText = "現在の面積: 0 平方メートル";
calculationCount = 0;
document.getElementById('count').innerText = "計算回数: 0";
}
</script>
</body>
</html>
