我对 d3.js 有疑问。我无法理解如何使用某些功能。我需要帮助。索引.html
<!DOCTYPE html>
<meta charset="utf-8">
<head>
<style>
</style>
</head>
<body>
<div id="tooltip"></div><!-- div to hold tooltip. -->
<!--<svg width="960" height="600" id="statesvg"></svg> <!– svg to hold the map. –>-->
<script src="https://d3js.org/d3.v5.min.js"></script>
<script src="https://d3js.org/d3-geo.v1.min.js"></script>
<script src="https://d3js.org/topojson.v2.min.js"></script>
<script src="uStates.js"></script> <!-- creates uStates. -->
<input type="file" id="fileUpload" onchange="a.parseExcel(event) "/>
<hr />
<div id="dvExcel"></div>
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/xlsx/0.13.5/xlsx.full.min.js"></script>
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/xlsx/0.13.5/jszip.js"></script>
<script>
const ExcelToJSON = function() {
this.parseExcel = function(file) {
const reader = new FileReader();
reader.onload = function(e) {
const data = e.target.result;
const workbook = XLSX.read(data, {
type: 'binary'
});
workbook.SheetNames.forEach(function(sheetName) {
// Here is your object
if(sheetName === 'Data')
{
const XL_row_object = XLSX.utils.sheet_to_row_object_array(workbook.Sheets[sheetName]);
const json_object = JSON.stringify(XL_row_object);
const data = json_object;
if (data) {
drawMap(data);
}
}
})
};
reader.onerror = function(ex) {
console.log(ex);
};
reader.readAsBinaryString(file.target.files[0]);
};
};
function tooltipHtml(n, d){ /* function to create html content string in tooltip div. */
return "<h4>"+n+"</h4><table>"+
"<tr><td>Low</td><td>"+(d[25])+"</td></tr>"+
"<tr><td>Average</td><td>"+(d.avg)+"</td></tr>"+
"<tr><td>High</td><td>"+(d.high)+"</td></tr>"+
"</table>";
}
let a = new ExcelToJSON();
const states = {
"AL": "Alabama",
"AK": "Alaska",
"AS": "American Samoa",
"AZ": "Arizona",
"AR": "Arkansas",
"CA": "California",
"CO": "Colorado",
"CT": "Connecticut",
"DE": "Delaware",
...............
};
var sampleData ={}; /* Sample random data. */
function drawMap(data) {
data = JSON.parse(data);
["HI", "AK", "FL", "SC", "GA", "AL", "NC", "TN", "RI", "CT", "MA",
"ME", "NH", "VT", "NY", "NJ", "PA", "DE", "MD", "WV", "KY", "OH",
"MI", "WY", "MT", "ID", "WA", "DC", "TX", "CA", "AZ", "NV", "UT",
"CO", "NM", "OR", "ND", "SD", "NE", "IA", "MS", "IN", "IL", "MN",
"WI", "MO", "AR", "OK", "KS", "LS", "VA"]
.forEach(function(d){
let newData;
newData = data.filter(item => {
return item["Age of Retirement"].trim().toUpperCase() === states[d].trim().toUpperCase();
});
const stateData = newData[0];
sampleData[d] = {};
for (let key in stateData) {
if (!isNaN(parseInt(key))) {
console.log(key);
sampleData[d][key] = stateData[key];
let a = stateData[25].replace(/[^0-9]/g, '');
sampleData[d].color = d3.interpolate("#ffffff", "#77062e")(parseInt(a)/10000000);
}
}
});
console.log(sampleData);
/* draw states on id #statesvg */
uStates.draw("#statesvg", sampleData, tooltipHtml);
d3.select(self.frameElement).style("height", "600px");
}
</script>
</body>
uStates.js
(function(){
var uStatePaths=[
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{id:"AK",n:"Alaska",d:"M158.07671,453.67502L157.75339,539.03215L159.36999,540.00211L162.44156,540.16377L163.8965,539.03215L166.48308,539.03215L166.64475,541.94205L173.59618,548.73182L174.08117,551.3184L177.47605,549.37846L178.1227,549.2168L178.44602,546.14524L179.90096,544.52863L181.0326,544.36697L182.97253,542.91201L186.04409,545.01361L186.69074,547.92352L188.63067,549.05514L189.7623,551.48006L193.64218,553.25833L197.03706,559.2398L199.78529,563.11966L202.04855,565.86791L203.50351,569.58611L208.515,571.36439L213.68817,573.46598L214.65813,577.83084L215.14311,580.9024L214.17315,584.29729L212.39487,586.56054L210.77826,585.75224L209.32331,582.68067L206.57507,581.22573L204.7968,580.09409L203.98849,580.9024L205.44344,583.65065L205.6051,587.36885L204.47347,587.85383L202.53354,585.9139L200.43195,584.62061L200.91693,586.23722L202.21021,588.0155L201.40191,588.8238C201.40191,588.8238,200.59361,588.50048,200.10863,587.85383C199.62363,587.20719,198.00703,584.45895,198.00703,584.45895L197.03706,582.19569C197.03706,582.19569,196.71374,583.48898,196.06709,583.16565C195.42044,582.84233,194.7738,581.71071,194.7738,581.71071L196.55207,579.77077L195.09712,578.31582L195.09712,573.30432L194.28882,573.30432L193.48052,576.6992L192.34888,577.1842L191.37892,573.46598L190.73227,569.74777L189.92396,569.26279L190.24729,574.92094L190.24729,576.05256L188.79233,574.75928L185.23579,568.77781L183.13419,568.29283L182.48755,564.57462L180.87094,561.66472L179.25432,560.53308L179.25432,558.26983L181.35592,556.97654L180.87094,556.65322L178.28436,557.29986L174.88947,554.87495L172.30289,551.96504L167.45306,549.37846L163.41152,546.79188L164.70482,543.55866L164.70482,541.94205L162.92654,543.55866L160.01664,544.69029L156.29843,543.55866L150.64028,541.13375L145.14381,541.13375L144.49717,541.61873L138.03072,537.73885L135.92912,537.41553L133.18088,531.59573L129.62433,531.91905L126.06778,533.374L126.55277,537.90052L127.68439,534.99062L128.65437,535.31394L127.19941,539.67879L130.43263,536.93055L131.07928,538.54716L127.19941,542.91201L125.90612,542.58869L125.42114,540.64875L124.12785,539.84045L122.83456,540.97208L120.08632,539.19381L117.01475,541.29541L115.23649,543.397L111.8416,545.4986L107.15342,545.33693L106.66844,543.23534L110.38664,542.58869L110.38664,541.29541L108.12338,540.64875L109.09336,538.22384L111.35661,534.34397L111.35661,532.5657L111.51827,531.75739L115.88313,529.49413L116.85309,530.78742L119.60134,530.78742L118.30805,528.20085L114.58983,527.87752L109.57834,530.62576L107.15342,534.02064L105.37515,536.60723L104.24352,538.87049L100.04033,540.32543L96.96876,542.91201L96.645439,544.52863L98.908696,545.4986L99.717009,547.60018L96.96876,550.83341L90.502321,555.03661L82.742574,559.2398L80.640977,560.37142L75.306159,561.50306L69.971333,563.76631L71.749608,565.0596L70.294654,566.51455L69.809672,567.64618L67.061434,566.67621L63.828214,566.83787L63.019902,569.10113L62.049939,569.10113L62.37326,566.67621L58.816709,567.96951L55.90681,568.93947L52.511924,567.64618L49.602023,569.58611L46.368799,569.58611L44.267202,570.87941L42.65059,571.68771L40.548995,571.36439L37.962415,570.23276L35.699158,570.87941L34.729191,571.84937L33.112578,570.71775L33.112578,568.77781L36.184142,567.48452L42.488929,568.13117L46.853782,566.51455L48.955378,564.41296L51.86528,563.76631L53.643553,562.958L56.391794,563.11966L58.008406,564.41296L58.978369,564.08964L61.241626,561.3414L64.313196,560.37142L67.708076,559.72478L69.00137,559.40146L69.648012,559.88644L70.456324,559.88644L71.749608,556.16823L75.791141,554.71329L77.731077,550.99508L79.994336,546.46856L81.610951,545.01361L81.934272,542.42703L80.317657,543.72032L76.922764,544.36697L76.276122,541.94205L74.982838,541.61873L74.012865,542.58869L73.851205,545.4986L72.39625,545.33693L70.941306,539.51713L69.648012,540.81041L68.516388,540.32543L68.193068,538.3855L64.151535,538.54716L62.049939,539.67879L59.463361,539.35547L60.918305,537.90052L61.403286,535.31394L60.756645,533.374L62.211599,532.40404L63.504883,532.24238L62.858241,530.4641L62.858241,526.09925L61.888278,525.12928L61.079966,526.58423L54.936843,526.58423L53.481892,525.29094L52.835247,521.41108L50.733651,517.85452L50.733651,516.88456L52.835247,516.07625L52.996908,513.97465L54.128536,512.84303L53.320231,512.35805L52.026941,512.84303L50.895313,510.09479L51.86528,505.08328L56.391794,501.85007L58.978369,500.23345L60.918305,496.51525L63.666554,495.22195L66.253132,496.35359L66.576453,498.77851L69.00137,498.45517L72.23459,496.03026L73.851205,496.67691L74.821167,497.32355L76.437782,497.32355L78.701041,496.03026L79.509354,491.6654C79.509354,491.6654,79.832675,488.75551,80.479317,488.27052C81.125959,487.78554,81.44928,487.30056,81.44928,487.30056L80.317657,485.36062L77.731077,486.16893L74.497847,486.97723L72.557911,486.49225L69.00137,484.71397L63.989875,484.55231L60.433324,480.83411L60.918305,476.95424L61.564957,474.52932L59.463361,472.75105L57.523423,469.03283L58.008406,468.22453L64.798177,467.73955L66.899773,467.73955L67.869736,468.70951L68.516388,468.70951L68.354728,467.0929L72.23459,466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.......
];
const uStates={};
const width = 960,
height = 600;
const projection = d3.geoAlbersUsa()
.scale(700)
.translate([width / 2, height / 2]);
const path = d3.geoPath()
.projection(projection);
const svg = d3.select("body").append("svg")
.attr("width", width)
.attr("height", height);
uStates.draw = function(id, data, toolTip){
function mouseOver(d){
d3.select("#tooltip").transition().duration(200).style("opacity", .9);
d3.select("#tooltip").html(toolTip(d.n, data[d.id]))
.style("left", (d3.event.pageX) + "px")
.style("top", (d3.event.pageY - 28) + "px");
}
function mouseOut(){
d3.select("#tooltip").transition().duration(500).style("opacity", 0);
}
svg.selectAll(".state")
.data(uStatePaths).enter().append("path").attr("class","state").attr("d",function(d){ return d.d;})
.style("fill",function(d){ return data[d.id].color; })
.attr("id", function(d){
return d.id;
})
.on("mouseover", mouseOver).on("mouseout", mouseOut);
svg.selectAll(".stateText")
.data(uStatePaths)
.enter().append("text")
.attr("x", function(d) {
return path.centroid(d.d)[0];
})
.attr("y", function(d) {
console.log(d, d.d)
return path.centroid(d.d)[1];
})
.attr("text-anchor", "middle")
.attr("font-size", "12px")
.text("foo")
};
this.uStates=uStates;
this.asd = uStatePaths;
})();
我通过绘制函数在 uStates.js 文件中绘制地图。我需要在他们的标签上画出每个州的标签。我找到了一些东西。但这对我不起作用。我需要给质心函数什么来找到路径的中心？