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filtering - D3过滤数据点

转载 作者:行者123 更新时间:2023-12-02 07:05:48 25 4
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我正在实现经典墨卡托示例 (https://github.com/mbostock/d3/blob/master/examples/mercator/mercator.html),我已将其更改为放大到阿富汗并仅使用一个自定义 slider 。我正在读取发生爆炸的地点的 GeoJSON 数据,图表在加载时将它们全部映射。我想使用 slider 一次只查看一个月的爆炸点,但无法过滤结果。我已经根据 Google 组中的帖子尝试了几种方法,但无法理解如何过滤之前从“explosions.json”读取的数据。感谢您的帮助!

    <!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html;charset=utf-8">
<title>IED Attacks in Afghanistan (2004-2009)</title>
<script type="text/javascript" src="../d3.v2.js"></script>
<script type="text/javascript" src="../lib/jquery/jquery.min.js"></script>
<script type="text/javascript" src="../lib/jquery-ui/jquery-ui.min.js"></script>
<style type="text/css">

@import url("../lib/jquery-ui/jquery-ui.css");

body, .ui-widget {
font: 14px Helvetica Neue;
}

svg {
width: 960px;
height: 600px;
border: solid 1px #ccc;
background: #eee;
}

line {
stroke: brown;
stroke-dasharray: 4,2;
}

path {
fill: #ccc;
stroke: #fff;
}

div {
width: 960px;
}

</style>
</head>
<body>
<h3>IED Attacks in Afghanistan (2004-2009)</h3>
<script type="text/javascript">

// Create the Mercator Projection (Map)
var xy = d3.geo.mercator(),
path = d3.geo.path().projection(xy);


// Create the states variable
var states = d3.select("body")
.append("svg")
.append("g")
.attr("id", "states");
// Create the equator variable
var equator = d3.select("svg")
.append("line")
.attr("x1", "0%")
.attr("x2", "100%");
// Create the explosions variable
var explosions = d3.select("svg")
.append("g")
.attr("id","explosions");

// Load in the states & equator data from the file 'world-countries.json'
d3.json("world-countries.json", function(collection) {
states
.selectAll("path")
.data(collection.features)
.enter().append("path")
.attr("d", path)
.append("title")
.text(function(d) { return d.properties.name; });
equator
.attr("y1", xy([0, 0])[1])
.attr("y2", xy([0, 0])[1]);
});

// the variable that holds our translate, center on Afghanistan
var translate = xy.translate(); //create translation to center gride in different area
translate[0] = -1741;
translate[1] = 1487;
xy.translate(translate); // center

xy.scale(12000); //zoom in

// Load in the explosions data from the file 'explosions.json'
d3.json("explosions.json", function(collection) {
explosions
.selectAll("path") //make a path and attach data
.data(collection.features)
.enter().append("path")
.attr("d", path)
.style("stroke","red") //color the path points
.style("stroke-width",2) //size of point stroke
.attr("class","explosionpoint")
.append("title") //title is the 'name' field in the json file
.text(function(d) { return d.properties.name; });
});



</script>

<p></p>
<!-- Slider -->
<div id="scale"></div><p></p>
<script type="text/javascript">

$("#scale").slider({
min: 20040101, //min : 1/1/04
max: 20100101, //max: 1/1/10
value: 20060601, //default slider value
step: 100, // step is the allow increments the slider can move. 100 = one month
slide: function(event, ui) {


/* REMOVE ALL EXPLOSION PATHS EXCEPT FOR A PARTICULAR MONTH OR RELOAD WITH FILTERED RESULTS */
}
});

</script>

最佳答案

您需要发布部分或全部 explosions.json 对象以获得具体答案。但是,如果 JSON 的结构类似于 {explosion1:{data1:true, data2:true}, explosion2:{data1:true, data2:false}}:

function filterJSON(json, key, value) {
var result = {};
for (var explosionIndex in json) {
if (json[explosionIndex][key] === value) {
result[explosionIndex] = json[explosionIndex];
}
}
return result;
}

(例如 filterJSON(myjson, "data1", true) 将给出所有带有 data1:true 的爆炸)

这不是 d3 特有的。

然后你可以在 d3 端使用类似这样的东西:

explosions.data(myFilteredData).exit().remove(); // remove ones you don't want
explosions.enter().append("path")... // add back ones you do want

如果我了解您的应用程序,实际上最好只切换 SVG 元素的 visiblity 属性。

var sliderrange = [20040101, 20040201]; //replace with code based on your slider
explosions.selectAll(".explosionpoint").attr("visibility", function(d) {
//Replace with the correct date comparison logic
return d.date < sliderrange[1] && d.date > sliderrange[0] ? "visible" : "hidden";
});

关于filtering - D3过滤数据点,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/12186220/

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