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ボロノイ図 - 最近傍探索
Raw
.block
license: gpl-3.0
Raw
README.md

ボロノイ図を使って、クリックした位置から最短距離の施設を見つけるサンプル(D3 ver4版)。

Built with blockbuilder.org

Raw
index.html
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge"/>
<title>ボロノイ図 - 最近傍探索</title>
<link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/leaflet/0.7.7/leaflet.css"/>
<style>
html, body{
padding: 0px;
margin: 0px;
width:100%;
height: 100%;
}
#map {
width:100%;
height: 488px;
}
</style>
</head>
<body>
Click on the map
<input name="volonoi_togle" type="radio" value="true">show
<input name="volonoi_togle" type="radio" value="false" checked="checked">hidden
<div id="map"></div>
<script src="//unpkg.com/babel-standalone@6.26.0/babel.min.js"></script>
<script src="//unpkg.com/d3@4.12.2/build/d3.min.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/leaflet/0.7.7/leaflet-src.js"></script>
<script type="text/babel">
const map = L.map("map")
let markers
L.tileLayer('http://cyberjapandata.gsi.go.jp/xyz/pale/{z}/{x}/{y}.png', {
attribution: "<a href='http://maps.gsi.go.jp/development/ichiran.html' target='_blank'>地理院タイル</a>"
}).addTo(map);
map.setView([36.322356, 139.013057], 14)
map._initPathRoot()
const svg = d3.select("#map").select("svg")
const voloLayer = svg.append("g")
.attr("class", "leaflet-zoom-hide")
.attr("id", "voloLayer")
d3.json("point.geojson", main)
function main(data) {
const positions = getPositions(data)
addMakers(positions)
drawVolonoi(positions)
setEvent(data)
}
function getPositions(data) {
const result = []
//位置情報→座標変換
data.features.forEach(d => {
const latlng = new L.LatLng(d.geometry.coordinates[1], d.geometry.coordinates[0])
result.push({
"id": d.id,
latlng: latlng
})
})
return result
}
function addMakers(positions) {
positions.forEach(d => {
L.marker(d.latlng).addTo(map)
})
}
function setEvent(data) {
map.on("viewreset moveend", function(){
d3.selectAll(".saitan").remove()
const positions = getPositions(data)
drawVolonoi(positions)
})
const volonoi_toggle = function(){
if(this.value === "true"){
d3.selectAll(".volonoi").attr("stroke-opacity", 1)
}else{
d3.selectAll(".volonoi").attr("stroke-opacity", 0)
}
}
const elm = d3.selectAll("input[name=volonoi_togle]")
elm.on("change", volonoi_toggle)
}
function drawVolonoi(data){
data.forEach(d => {
d.x = map.latLngToLayerPoint(d.latlng).x
d.y = map.latLngToLayerPoint(d.latlng).y
})
const voronoi = d3.voronoi()
.x(d => d.x )
.y(d => d.y )
const polygons = voronoi(data).polygons()
voloLayer.selectAll(".volonoi").remove()
voloLayer.selectAll("path")
.data(polygons)
.enter()
.append("svg:path")
.attr("class", "volonoi")
.attr("id", (d, i) => `volo${i}` )
.attr("d", d => {
if(!d) return null
return "M" + d.filter( df => df != null ).join("L") + "Z"
})
.attr("stroke", "black")
.attr("fill", "white")
.attr("fill-opacity", 0)
.on("click", function(d){
voloLayer.selectAll(".saitan").remove()
addCircle(d.data.x, d.data.y, 20)
const mouseXY = d3.mouse(this)
addLine(d.data.x, d.data.y, mouseXY[0], mouseXY[1])
addCircle(mouseXY[0], mouseXY[1], 4)
})
const elm = document.querySelector("input[name=volonoi_togle]:checked")
if(elm.value === "true"){
d3.selectAll(".volonoi").attr("stroke-opacity", 1)
}else{
d3.selectAll(".volonoi").attr("stroke-opacity", 0)
}
}
function addCircle(x, y, r){
voloLayer.append("circle")
.attr("class", "saitan")
.attr("cx", x)
.attr("cy", y)
.attr("r", 0)
.transition()
.attr("cx", x)
.attr("cy", y)
.attr("r", r)
.attr("fill", "none")
.attr("stroke", "red")
.attr("stroke-width", 5)
}
function addLine(x1, y1, x2, y2){
voloLayer.append("line")
.attr("class", "saitan")
.attr("x1", x2)
.attr("y1", y2)
.attr("x2", x2)
.attr("y2", y2)
.transition()
.attr("x1", x1)
.attr("y1", y1)
.attr("x2", x2)
.attr("y2", y2)
.attr("stroke", "red")
.attr("stroke-width", 5)
}
</script>
</body>
</html>
Display the source blob
Display the rendered blob
Raw
point.geojson
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