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javascript - D3 热图 - 色标仅显示一种颜色

转载 作者:行者123 更新时间:2023-11-28 17:30:26 25 4
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我正在尝试使用 ABS 中的数据和 json 地理数据制作热图。由于某种原因,当我测试它时,它只为所有段分配一种颜色,而不是为较高/较低的数字分配较浅/较深的颜色。我相信我的代码正在为 json 中的每个 map 段分配一个值,但由于某种原因,色标并未应用于这些值。

这是我的 d3 代码:

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>D3: Setting path fills dynamically to generate a choropleth</title>
<script type="text/javascript" src="d3.js"></script>
<style type="text/css">
/* No style rules here yet */
</style>
</head>
<body>
<script type="text/javascript">

//Width and height
var w = 1000;
var h = 600;

var path = d3.geoPath()
.projection(d3.geoMercator()
.center([151,-33.5])
.scale(17000)
.translate([w/2,h/2]));

//Define quantize scale to sort data values into buckets of color
var color = d3.scaleQuantize()
.range(["rgb(237,248,233)","rgb(186,228,179)","rgb(116,196,118)","rgb(49,163,84)","rgb(0,109,44)"]);
//Colors derived from ColorBrewer, by Cynthia Brewer, and included in
//https://github.com/d3/d3-scale-chromatic

//Create SVG element
var svg = d3.select("body")
.append("svg")
.attr("width", w)
.attr("height", h);

//Load in agriculture data
d3.csv("ManagerArea.csv", function(data) {

//Set input domain for color scale
color.domain([
d3.min(data, function(d) { return d.value; }),
d3.max(data, function(d) { return d.value; })
]);

//Load in GeoJSON data
d3.json("australia_adm2.json", function(json) {

//Merge the ag. data and GeoJSON
//Loop through once for each ag. data value
for (var i = 0; i < data.length; i++) {

//Grab state name
var dataState = data[i].state;

//Grab data value, and convert from string to float
var dataValue = parseFloat(data[i].value);

//Find the corresponding state inside the GeoJSON
for (var j = 0; j < json.features.length; j++) {

var jsonState = json.features[j].properties.sa4_name11;

if (dataState == jsonState) {

//Copy the data value into the JSON
json.features[j].properties.value = dataValue;

//Stop looking through the JSON
break;

}
}
}

//Bind data and create one path per GeoJSON feature
svg.selectAll("path")
.data(json.features)
.enter()
.append("path")
.attr("d", path)
.style("fill", function(d) {
//Get data value
var value = d.properties.value;

if (value) {
//If value exists…
return color(value);
} else {
//If value is undefined…
return "#ccc";
}
});

});

});

</script>
</body>
</html>

我的 json 地理数据中的命名:

{“类型”:“特征集合”,“特征”:[{“类型”:“特征”,“几何”:{“类型”:“多多边形”,“坐标”:...

..."properties":{"cartodb_id":1,"sa4_name11":"悉尼 - Baulkham Hills 和 Hawkesbury","right_dpop":38742,"right_opop":69540,"right_xcoord":150.8288053,"right_ycoord “:-33.36860558}},

我的 csv 数据:

state,value
Capital Region,15558
Central Coast,15642
Central West,13074
Coffs Harbour - Grafton,6274
Far West and Orana,7968
Hunter Valley exc Newcastle,11717
Illawarra,13278
Mid North Coast,8758
Murray,8298
New England and North West,12884
Newcastle and Lake Macquarie,15980
Richmond - Tweed,12013
Riverina,11055
Southern Highlands and Shoalhaven,7191
Sydney - Baulkham Hills and Hawkesbury,19904
Sydney - Blacktown,14710
Sydney - City and Inner South,27758
Sydney - Eastern Suburbs,24778
Sydney - Inner South West,27081
Sydney - Inner West,24055
Sydney - North Sydney and Hornsby,39796
Sydney - Northern Beaches,24080
Sydney - Outer South West,12403
Sydney - Outer West and Blue Mountains,15767
Sydney - Parramatta,20323
Sydney - Ryde,13468
Sydney - South West,15090
Sydney - Sutherland,16901

Result

最佳答案

我认为问题出在这一段:

color.domain([
d3.min(data, function(d) { return d.value; }),
d3.max(data, function(d) { return d.value; })
]);

d.value 被视为字符串而不是数字。它应该是一个数字。您可以使用 parseFloat(d.value) 将其设为数字​​,如前所述 on this post或者插入一元加号:+d.value,如 Mike Bostock's choropleth 中使用的那样.

关于javascript - D3 热图 - 色标仅显示一种颜色,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/50584686/

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