Population Density
zips = FileAttachment("bangkok district.geojson").json()
waterbodies = FileAttachment("bangkok water bodies@1.geojson").json()
housing = FileAttachment("community housing.geojson").json()
river = FileAttachment("River Outline.geojson").json()
river2 = FileAttachment("River Outline 2.geojson").json()
market = FileAttachment("Markets.geojson").json()
population3 = FileAttachment("population 3.geojson").json()
river5 = FileAttachment("river 5.geojson").json()
district = FileAttachment("district2.geojson").json()
district2 = FileAttachment("district4.geojson").json()
d3 = require("d3@6")
chart = {
const width = 960,
height = 900;
const svg = d3.create("svg")
.attr("viewBox", [-60, 0, width, height]);
// Use Mercator projection
var projection = d3
.geoMercator()
.fitSize([width - 60, height - 60], zips);
var path = d3.geoPath().projection(projection);
var path2 = d3.geoPath().projection(projection);
var path3 = d3.geoPath().projection(projection);
var path4 = d3.geoPath().projection(projection);
var g = svg.append("g").attr("id", "paths");
g.selectAll("path") //d3 geopath
//svg
//.selectAll('path')
.data(zips.features) //get data to define path
.enter() //there are more data than elements, this selects them
.append("path") //appends path to data
.attr('class','outlines')
.attr("d", path) //The d attribute defines a path to be drawn, only applies to appended elements
.style("fill", "white")
.style('fill-opacity','.25')
.style("stroke-width", "1")
.style("stroke", "black")
var g = svg.append("g").attr("id", "paths");
g.selectAll("path") //d3 geopath
//svg
//.selectAll('path')
.data(district2.features) //get data to define path
.enter() //there are more data than elements, this selects them
.append("path") //appends path to data
.attr('class','outlines')
.attr("d", path) //The d attribute defines a path to be drawn, only applies to appended elements
.attr("fill", d => color(d.properties.pop_dense))
.style('fill-opacity','0.6')
.style("stroke-width", "1")
.style("stroke", "black")
.on('mouseover', addBox2)
.on('mouseout', removeBox2)
var tooltip = svg.append("g");
//add district names tool tip
var tooltip = svg.append("g");
function addBox2(event, d) {
var centroid = path.centroid(d);
tooltip.call(
callout,
`${d.properties.dname_e}
${d.properties.num_pop}`
);
tooltip.attr("transform", "translate(" + centroid + ")");
}
function removeBox2(event, d) {
tooltip.call(callout,null)
}
g.selectAll("path3") //d3 geopath
//svg
//.selectAll('path')
.data(river5.features) //get data to define path
.enter() //there are more data than elements, this selects them
.append("path") //appends path to data
.attr('class','outlines')
.attr("d", path) //The d attribute defines a path to be drawn, only applies to appended elements
.style("fill", "rgb(0, 0, 212)")
.style('fill-opacity','.7')
.style("stroke-width", "1")
.style("stroke", "black")
//insert markets into map
g.selectAll("circle2") //d3 geopath
//svg
//.selectAll('path')
.data(market.features) //get data to define path
.enter() //there are more data than elements, this selects them
.append("circle") //appends path to data
.attr('cx',function(d) {return path.centroid(d)[0]})
.attr("cy", function(d) {return path.centroid(d)[1]})
.attr('r',3)
.attr("fill", "rgb(121, 55, 212)")
.style('fill-opacity','0.7')
//insert community housing into map
g.selectAll("circle3") //d3 geopath
//svg
//.selectAll('path')
.data(housing.features) //get data to define path
.enter() //there are more data than elements, this selects them
.append("circle") //appends path to data
.attr('cx',function(d) {return path.centroid(d)[0]})
.attr("cy", function(d) {return path.centroid(d)[1]})
.attr('r',1)
.attr("fill", "black")
.style('fill-opacity','1')
return svg.node();
}
color = d3.scaleQuantize([1, 15000], d3.schemeYlOrRd[9])
//yourData.map((element, index) => {
//})
callout = (g, value) => {
if (!value) return g.style("display", "none");
g
.style("display", null)
.style("pointer-events", "none")
.style("font", "10px sans-serif");
const path = g.selectAll("path")
.data([null])
.join("path")
.attr("fill", "white")
.attr("stroke", "black");
const text = g.selectAll("text")
.data([null])
.join("text")
.call(text => text
.selectAll("tspan")
.data((value + "").split(/\n/))
.join("tspan")
.attr("x", 0)
.attr("y", (d, i) => `${i * 1.1}em`)
.style("font-weight", (_, i) => i ? null : "bold")
.text(d => d));
const {x, y, width: w, height: h} = text.node().getBBox();
text.attr("transform", `translate(${-w / 2},${15 - y})`);
path.attr("d", `M${-w / 2 - 10},5H-5l5,-5l5,5H${w / 2 + 10}v${h + 20}h-${w + 20}z`);
}
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