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切り取ったポリゴンを生成するメモ2。




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script.js

// MIERUNE MONO読み込み
var map = new mapboxgl.Map({
container: "map",
style: {
version: 8,
sources: {
m_mono: {
type: "raster",
tiles: ["https://tile.mierune.co.jp/mierune_mono/{z}/{x}/{y}.png"],
tileSize: 256
}
},
layers: [{
id: "m_mono",
type: "raster",
source: "m_mono",
minzoom: 0,
maxzoom: 18
}]
},
center: [139.770, 35.676],
zoom: 13
});


map.on("load", function () {
// ポリゴンを取得
var polygon1 = turf.polygon([[
[139.76793766021726, 35.687452668555544],
[139.77004051208496, 35.683060650398176],
[139.77875232696533, 35.6796793288464],
[139.78068351745605, 35.685361261493114],
[139.76793766021726, 35.687452668555544]
]]);

// ポリゴン表示
map.addSource("PolygonSample", {
type: "geojson",
data: polygon1
});
map.addLayer({
id: "PolygonSample",
type: "fill",
source: "PolygonSample",
layout: {},
paint: {
"fill-color": "#FFD464",
"fill-opacity": 0.5
}
});
map.addLayer({
id: "PolygonLineSample",
type: "line",
source: "PolygonSample",
layout: {
"line-join": "round",
"line-cap": "round"
},
paint: {
"line-color": "#FFD464",
"line-width": 10,
"line-opacity": 0.8
}
});

// ポリゴンを取得
var polygon2 = turf.polygon([[
[139.7661, 35.6759],
[139.7718, 35.6741],
[139.7722, 35.6745],
[139.7786, 35.6837],
[139.7734, 35.6843],
[139.7709, 35.6846],
[139.7687, 35.6799],
[139.7661, 35.6759]
]]);

// ポリゴン表示
map.addSource("PolygonSample2", {
type: "geojson",
data: polygon2
});
map.addLayer({
id: "PolygonSample2",
type: "fill",
source: "PolygonSample2",
layout: {},
paint: {
"fill-color": "#1253A4",
"fill-opacity": 0.5
}
});
map.addLayer({
id: "PolygonLineSample2",
type: "line",
source: "PolygonSample2",
layout: {
"line-join": "round",
"line-cap": "round"
},
paint: {
"line-color": "#1253A4",
"line-width": 10,
"line-opacity": 0.8
}
});

// 切り取ったポリゴン生成(1番目ポリゴンと2番目ポリゴンの重なった部分を切り取り)
var intersection = turf.intersect(polygon1, polygon2);

// ポリゴン表示
map.addSource("PolygonSample3", {
type: "geojson",
data: intersection
});
map.addLayer({
id: "PolygonSample3",
type: "fill",
source: "PolygonSample3",
layout: {},
paint: {
"fill-color": "#58BE89",
"fill-opacity": 0.5
}
});
map.addLayer({
id: "PolygonLineSample3",
type: "line",
source: "PolygonSample3",
layout: {
"line-join": "round",
"line-cap": "round"
},
paint: {
"line-color": "#58BE89",
"line-width": 5,
"line-opacity": 0.8
}
});

});

// コントロール関係表示
map.addControl(new mapboxgl.NavigationControl());






Turf.jsを手軽に始めるビルド環境公開しています。
turfjs-starter




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