Javascript 正确访问d3地图标签的指定json坐标
提供具有以下结构的外部json文件us-states.json:Javascript 正确访问d3地图标签的指定json坐标,javascript,json,d3.js,Javascript,Json,D3.js,提供具有以下结构的外部json文件us-states.json: { "type": "FeatureCollection", "features": [ { "type": "Feature", "properties": { "GEO_ID": "0400000US23", "STATE": "23", "NAME": "Maine", "LSAD": "", "CENSUSAREA": 30842.923000 }, "geometry": { "type": "MultiPolygon"
{
"type": "FeatureCollection",
"features": [
{ "type": "Feature", "properties": { "GEO_ID": "0400000US23", "STATE": "23", "NAME": "Maine", "LSAD": "", "CENSUSAREA": 30842.923000 }, "geometry": { "type": "MultiPolygon", "coordinates": [ [ [ [ -67.619761, 44.519754 ], [ -67.615410, 44.521973 ], [ -67.587738, 44.516196 ] ... ] ] ] } } ...
我能够渲染贴图并使用data.csv中的值对其进行着色,但无法附加贴图标签并使其显示在脚本末尾的底部
<script type="text/javascript">
var width = 800;
var height = 460;
var projection = d3.geo.albersUsa()
.translate([width/2, height/2])
.scale([1000]);
var path = d3.geo.path()
.projection(projection);
var color = d3.scale.linear()
.range(["rgb(255,90,95)","rgb(84,36,55)","rgb(0,80,160)"]);
var svg = d3.select("body")
.append("svg")
.attr("class","map")
.attr("width", width)
.attr("height", height)
.attr("align","center");
d3.csv("data.csv", function(data) {
color.domain([1,2,3]);
d3.json("us-states.json", function(json) {
for (var i = 0; i < data.length; i++) {
var dataState = data[i].state;
var dataValue = data[i].value;
var dataLink = data[i].link;
for (var j = 0; j < json.features.length; j++) {
var jsonState = json.features[j].properties.NAME;
var jsonStateCoords = json.features[j].geometry.coordinates
if (dataState == jsonState) {
json.features[j].properties.value = dataValue;
json.features[j].properties.link = dataLink;
json.features[j].properties.coordinates = jsonStateCoords;
break;
}
}
};
svg.selectAll("path")
.data(json.features)
.enter()
.append("path")
.attr("d", path)
.style("stroke", "#fff")
.style("stroke-width", "1")
.style("fill", function(d) {
var value = d.properties.value;
if (value) {
return color(value);
} else {
return "rgb(213,222,217)";
}
})
// part of the script that isn't working
svg.selectAll("text")
.data(json.features)
.enter()
.append("svg:text")
.attr("d", path)
.text(function(d){return d.properties.state; })
.attr("x", function(d){ return d.properties.coordinates[0] })
.attr("y", function(d){ return d.properties.coordinates[1] })
.attr("text-anchor","middle")
.attr('font-size', '13px')
.attr('color', 'white');
});
</script>
我可以console.logjsonStateCoords并查看它们。为什么我无法访问返回d.properties.coords.x或d.properties.coords.y的字段值?取而代之的是未定义获取d.properties.coords。谢谢在状态上添加标签时,您要查找的是状态边界路径的质心。d3有一个计算质心的方法
svg.selectAll("text")
.data(json.features)
.enter()
.append("svg:text")
.attr("text-anchor","middle")
.attr('font-size', '13px')
.attr('fill', 'blue')
.text(function(d) {
return d.properties.NAME;
})
.attr("x", function(d) {
return path.centroid(d)[0];
})
.attr("y", function(d) {
return path.centroid(d)[1];
})
相关问题:
区块:
此处的测试代码:
var宽度=800;
var高度=460;
var投影=d3.geo.Albersua
.平移[宽度/2,高度/2]
.比例尺[1000];
var path=d3.geo.path
.投射投射;
var color=d3.scale.linear
.范围[rgb255,90,95,rgb84,36,55,rgb0,80160];
var svg=d3.selectbody
.appendsvg
类,地图
.宽度,宽度
.身高,身高
.对齐,居中;
d3。csvhttps://cors-anywhere.herokuapp.com/https://gist.githubusercontent.com/radaatyr/313875565a6af5832473625157bd8d40/raw/bc0edee1910034bcc72aac82de659883e6a91f45/postus.json,函数数据{
色域[1,2,3];
d3。jsonhttps://gist.githubusercontent.com/radaatyr/0e5fcda67ff33afb92b505c5af16d779/raw/bce351a66607ae2c9215a7919981b840c9bb4ddf/us-states.json,functionjson{
对于变量i=0;i