为什么我无法使用 topojson 获取要渲染的 d3.js 地图?
Why can't I get a d3.js map to render using topojson?
我在让 d3 从 topoJson 数据渲染 geoAlbersUsa 投影时遇到一些困难。我显示的是空白屏幕,但没有返回任何错误。 geoJson 数据似乎运行良好,但由于某种原因它没有呈现路径。任何帮助将不胜感激!
相关代码如下:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title></title>
<script src="https://d3js.org/d3.v6.min.js"></script>
<script src="https://unpkg.com/topojson-client@3"></script>
</head>
<body>
<script>
const width = 1000;
const height = 600;
const projection = d3.geoAlbersUsa()
.translate([width / 2, height / 2])
.scale(800);
const path = d3.geoPath(projection);
const svg = d3.select("body")
.append("svg")
.attr("height", height)
.attr("width", width)
.style("display", "block")
.style("margin", "auto");
d3.json("https://d3js.org/us-10m.v1.json").then(data => {
svg.selectAll(".states")
.data(topojson.feature(data, data.objects.states).features)
.attr("d", path)
.style("fill", "none")
.attr("class", "states")
.style("stroke", "black")
.style("stroke-width", "2px")
});
</script>
</body>
</html>
您需要加入一个元素:
.data(topojson.feature(data, data.objects.states).features)
.join("path") // here
.attr("d", path)
.style("fill", "none")
.attr("class", "states")
.style("stroke", "black")
.style("stroke-width", "2px")
我在让 d3 从 topoJson 数据渲染 geoAlbersUsa 投影时遇到一些困难。我显示的是空白屏幕,但没有返回任何错误。 geoJson 数据似乎运行良好,但由于某种原因它没有呈现路径。任何帮助将不胜感激!
相关代码如下:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title></title>
<script src="https://d3js.org/d3.v6.min.js"></script>
<script src="https://unpkg.com/topojson-client@3"></script>
</head>
<body>
<script>
const width = 1000;
const height = 600;
const projection = d3.geoAlbersUsa()
.translate([width / 2, height / 2])
.scale(800);
const path = d3.geoPath(projection);
const svg = d3.select("body")
.append("svg")
.attr("height", height)
.attr("width", width)
.style("display", "block")
.style("margin", "auto");
d3.json("https://d3js.org/us-10m.v1.json").then(data => {
svg.selectAll(".states")
.data(topojson.feature(data, data.objects.states).features)
.attr("d", path)
.style("fill", "none")
.attr("class", "states")
.style("stroke", "black")
.style("stroke-width", "2px")
});
</script>
</body>
</html>
您需要加入一个元素:
.data(topojson.feature(data, data.objects.states).features)
.join("path") // here
.attr("d", path)
.style("fill", "none")
.attr("class", "states")
.style("stroke", "black")
.style("stroke-width", "2px")