我试图根据'd.lon'值有条件地为这些voronoi分段着色。如果它是正面的,我希望它是绿色的,如果它是负面的,我希望它是红色的。然而,目前它将每个细分都归为绿色。voronoi分段的条件填充/颜色
即使我将我的<操作数替换为>,它仍会返回绿色。
活生生的例子在这里:https://allaffects.com/world/
谢谢:)
JS
// Stating variables
var margin = {top: 20, right: 40, bottom: 30, left: 45},
width = parseInt(window.innerWidth) - margin.left - margin.right;
height = (width * .5) - 10;
var projection = d3.geo.mercator()
.center([0, 5 ])
.scale(200)
.rotate([0,0]);
var svg = d3.select("body").append("svg")
.attr("width", width)
.attr("height", height);
var path = d3.geo.path()
.projection(projection);
var voronoi = d3.geom.voronoi()
.x(function(d) { return d.x; })
.y(function(d) { return d.y; })
.clipExtent([[0, 0], [width, height]]);
var g = svg.append("g");
// Map data
d3.json("/world-110m2.json", function(error, topology) {
// Cities data
d3.csv("/cities.csv", function(error, data) {
g.selectAll("circle")
.data(data)
.enter()
.append("a")
.attr("xlink:href", function(d) {
return "https://www.google.com/search?q="+d.city;}
)
.append("circle")
.attr("cx", function(d) {
return projection([d.lon, d.lat])[0];
})
.attr("cy", function(d) {
return projection([d.lon, d.lat])[1];
})
.attr("r", 5)
.style("fill", "red");
});
g.selectAll("path")
.data(topojson.object(topology, topology.objects.countries)
.geometries)
.enter()
.append("path")
.attr("d", path)
});
var voronoi = d3.geom.voronoi()
.clipExtent([[0, 0], [width, height]]);
d3.csv("/cities.csv", function(d) {
return [projection([+d.lon, +d.lat])[0], projection([+d.lon, +d.lat]) [1]];
}, function(error, rows) {
vertices = rows;
console.log(vertices);
drawV(vertices);
}
);
function polygon(d) {
return "M" + d.join("L") + "Z";
}
function drawV(d) {
svg.append("g")
.selectAll("path")
.data(voronoi(d), polygon)
.enter().append("path")
.attr("class", "test")
.attr("d", polygon)
// This is the line I'm trying to get to conditionally fill the segment.
.style("fill", function(d) { return (d.lon < 0 ? "red" : "green" );})
.style('opacity', .7)
.style('stroke', "pink")
.style("stroke-width", 3);
}
JS编辑
d3.csv("/static/cities.csv", function(data) {
var rows = [];
data.forEach(function(d){
//Added third item into my array to test against for color
rows.push([projection([+d.lon, +d.lat])[0], projection([+d.lon, +d.lat]) [1], [+d.lon]])
});
console.log(rows); // data for polygons and lon value
console.log(data); // data containing raw csv info (both successfully log)
svg.append("g")
.selectAll("path")
.data(voronoi(rows), polygon)
.enter().append("path")
.attr("d", polygon)
//Trying to access the third item in array for each polygon which contains the lon value to test
.style("fill", function(data) { return (rows[2] < 0 ? "red" : "green");})
.style('opacity', .7)
.style('stroke', "pink")
.style("stroke-width", 3)
});
谢谢Gerado :)我已经更新了我的示例代码和链接示例与您的建议。你会看到我可以成功记录数据和行数组。我试图实现你的第二个建议,即将所有内容保存在一个数组中,我无法遍历行数据并访问我的条件.style填充语句中的.lon值。 – William
正如我所说,唯一的方法来帮助你的第二个建议是,如果你提供了一个工作代码(把你的代码链接在Plunker/Fiddle?CodePen/Whatever,所以我们可以修改它)。关于第一个建议,你做错了。试试这个:'.style(“fill”,function(d,i){return data [i] .lon <0?“red”:“green”;})'。 –
非常感谢:D这正是我想要做的。标记为正确。 – William