landform classification with fill-pattern
Created
June 16, 2021 08:02
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landform classification with fill-pattern
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<!DOCTYPE html> | |
<html> | |
<head> | |
<meta charset="UTF-8"> | |
<title>landform classification with fill-pattern</title> | |
<meta name="viewport" content="initial-scale=1.0, maximum-scale=1.0" /> | |
<link rel="stylesheet" href="https://unpkg.com/maplibre-gl@1.14.0/dist/maplibre-gl.css" /> | |
<script src="https://unpkg.com/maplibre-gl@1.14.0/dist/maplibre-gl.js"></script> | |
</head> | |
<body> | |
<div id="map" style="position:absolute;top:0;left:0;bottom:0;right:0;"></div> | |
<script> | |
const createImageData = function(size, color, letter) { | |
const canvas = document.createElement("canvas"); | |
canvas.width = canvas.height = size; | |
const context = canvas.getContext("2d"); | |
context.fillStyle = color; | |
context.fillRect(0, 0, size, size); | |
context.font = `${size-1}px sans-serif`; | |
context.fillStyle = "rgba(0,0,0,0.8)"; | |
context.fillText(letter, 0, size - 1.0); | |
context.fillStyle = "rgba(255,255,255,0.8)"; | |
context.fillText(letter, 1, size - 0); | |
context.fillStyle = color; | |
context.fillText(letter, 0.5, size - 0.5); | |
return context.getImageData(0, 0, size, size); | |
}; | |
const definition = { | |
"山地": "#d9cbae", | |
"崖・段丘崖": "#9466ab", | |
"地すべり地形": "#cc99ff", | |
"台地・段丘": "#ffaa00", | |
"山麓堆積地形": "#99804d", | |
"扇状地": "#cacc60", | |
"堤:自然堤防": "#ffff33", | |
"天井川": "#fbe09d", | |
"砂州・砂丘": "#ffff99", | |
"凹地・浅い谷": "#a3cc7e", | |
"氾濫平野": "#bbff99", | |
"後背低地・湿地": "#00d1a4", | |
"旧河道": "#6699ff", | |
"落堀": "#1f9999", | |
"河川敷・浜": "#9f9fc4", | |
"水部": "#e5ffff", | |
"旧水部": "#779999" | |
}; | |
fetch("https://gsi-cyberjapan.github.io/gsivectortile-mapbox-gl-js/std.json").then(res => res.json()).then(style => { | |
style.sources.v = { | |
"type": "vector", | |
"tiles": [ | |
"https://optgeo.github.io/unite-one/zxy/{z}/{x}/{y}.pbf" | |
], | |
"attribution": "国土地理院ベクトルタイル提供実験", | |
"minzoom": 10, | |
"maxzoom": 12 | |
}; | |
style.layers = style.layers.filter(a => a["source-layer"] !== "building"); | |
const map = new maplibregl.Map({ | |
"container": "map", | |
"center": [139.766168,35.704822], | |
"zoom": 16.5, | |
"pitch": 60, | |
"bearing": -30, | |
"hash": true, | |
"style": style | |
}); | |
map.on("load", function() { | |
Object.keys(definition).map((key, i) => { | |
const letter = key.substring(0, 1); | |
map.addImage(key, createImageData(16, definition[key], letter)); | |
map.addLayer({ | |
"id": `one${i}`, | |
"source": "v", | |
"source-layer": "one", | |
"type": "fill", | |
"filter": ["==", key, ["get", "code"]], | |
"paint": { | |
"fill-pattern": key | |
} | |
}, style.layers[0].id); | |
}) | |
}); | |
}); | |
</script> | |
</body> | |
</html> |
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