[英]Voronoi cells fill function with D3 (v4)
我正在嘗試改寫Voronoi圖與地圖疊加的示例。
我有一個包含緯度,經度和一些我想使用的信息的csv(例如,對顏色圖的細胞和細菌進行着色)
這是csv的第一行:
name,value,latitude,longitude
station1,18921,48.8286765,7.742563499999999
station2,73187,48.905260999999996,7.6535345
station3,146444,48.9310582,7.658132000000001
station4,61442,48.8334661,8.029873799999999
station5,107423,48.665965899999996,7.717782400000001
station6,14808,49.0559404,7.1410655
station7,1137493,48.744460600000004,7.362080199999999
station8,5684,48.934732700000005,8.1615803
然后,HTML(其中包含CSS和JSS):
<!DOCTYPE html>
<html>
<style>
.train_station {
fill:#4e7d92;
}
.cell {
stroke: #000;
fill-opacity: 0.6;
stroke-opacity: 0.3;
cursor: pointer;
}
.cell :hover {
fill:#000;
stroke: #000;
fill-opacity: 0.7;
stroke-opacity: 0.3;
cursor: pointer;
}
</style>
<head>
<meta charset="utf-8">
</head>
<body>
<div id="map"></div>
<script src="http://d3js.org/d3.v4.min.js"></script>
<script src="http://d3js.org/topojson.v2.min.js"></script>
<script type="text/javascript">
// first, dimensions, projection and others basic variables
var width = 700,
height = width*0.85;
var proj = d3.geoMercator()
.center([5.8287, 48.8320])
.scale(width * 11.5)
.translate([width / 2, height / 2]);
var path = d3.geoPath()
.projection(proj)
.pointRadius(width*0.0019);
var radius = d3.scaleSqrt()
.domain([0, 100])
.range([0, 14]);
var voronoi = d3.voronoi()
.extent([[-1, -1], [width + 1, height + 1]]);
var svg = d3.select("#map").append("svg")
.attr("width", width)
.attr("height", height);
d3.queue()
.defer(d3.csv,"my_csv.csv", typeStation)
.await(ready)
// the typeStation function is very important
function ready(err, stations) {
// first selection
var station = svg.selectAll(".station")
.data(stations)
.enter()
.append("g")
.attr("class", "station");
// Voronoi's transformation with previous selection
station.append("path")
.data(voronoi.polygons(stations.map(proj)))
.attr("class", "cell")
.attr("d", function(d) { return d ? "M" + d.join("L") + "Z" : null; })
.attr("fill", function(d){
// Probleme is here
console.log(d)
});
svg.append("path")
.datum({type: "MultiPoint", coordinates: stations})
.attr("class", "train_station")
.attr("d", path);
};
// and the function to parse latitude and longitude of csv
function typeStation(d) {
d[0] = +d.longitude;
d[1] = +d.latitude;
return d;
}
</script>
</body>
但是控制台登錄單元格的填充功能未發送任何內容:d不可用。 我在StakOverflow上找到了上一篇文章 ,我認為我的問題已經非常接近了,但是我不知道如何使用新的D3 V4進行修復。
如果我沒記錯的話,typeStation函數將緯度和經度轉換為數組中的csv數據(因為它是voronoi.polygons()理解的數據類型)。 所以我試圖這樣改變它:
function typeStation(d) {
d[0] = +d.longitude;
d[1] = +d.latitude;
d[2] = +d.name;
d[3] = +d.value;
return d;
}
目的是直接在數組中添加名稱(用於工具提示)和值(用於條件填充)。 但是問題還是一樣的...
還是要提前謝謝!
長話短說 :
因此,這里是完整的typeStation:
function typeStation(d) {
d[0] = +d.longitude;
d[1] = +d.latitude;
d[2] = d.name; // = + can't work with a String
d[3] = +d.value;
return d;
}
然后,在這種情況下,我們想用值的值填充Voronoi單元:
station.append("path")
.data(voronoi.polygons(stations.map(proj)))
.attr("class", "cell")
.attr("d", function(d) { return d ? "M" + d.join("L") + "Z" : null; })
.attr("fill", function(d){
if (d[3] < 60000) {
return "#c0c0c0";
}
// other cases, etc...
else {
return "#fff";
}
});
而且效果很好!
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