本文介绍了使用D3.js创建物流地图的示例代码,分享给大家,具体如下:
示例图
制作思路
开始撸码
1.创建网页模板
加载D3JS,为了方便调试,直接下载d3.js文件在本地,实际使用的时候,可以换成加载路径。注意,使用的是V4版的D3,和V3版有差异。
创建一个DIV块,准备绘图。
<!DOCTYPE html> <html lang="en"> <head> <meta charset="utf8"> <script type="text/javascript" src="../../static/d3/d3.js"></script> <title>地图</title> </head> <body> <div class="fxmap"> </div> </body> <script type="text/javascript"></script> </html>
创建SVG,以下所有代码放在<script></script>中
var width=1000 , height=800; // 定义SVG宽高 var svg = d3.select("body div.fxmap") .append("svg") .attr("width", "width) .attr("height", height) .style("background","#000"); //
创建SVG图形分组,以备调用
gmap = svg.append("g").attr("id", "map").attr("stroke", "white").attr("stroke-width",1); mline = svg.append("g").attr("id", "moveto").attr("stroke", "#FFF").attr("stroke-width", 1.5).attr("fill","#FFF"); button = svg.append("g").attr("id", "button").attr("stroke", "white").attr("stroke-width", 1).attr("fill", "white");
创建投影函数
var projection = d3.geoEquirectangular() .center([465,395]) // 指定投影中心,注意[]中的是经纬度 .scale(height) .translate([width / 2, height / 2]); var path = d3.geoPath().projection(projection);
创建marker标记,以便多个连线终点调用
marker = svg.append("defs") .append("marker") .append("marker") .attr("id", "pointer") .attr("viewBox","0 0 12 12") // 可见范围 .attr("markerWidth","12") // 标记宽度 .attr("markerHeight","12") // 标记高度 .attr("orient", "auto") // .attr("markerUnits", "strokeWidth") // 随连接线宽度进行缩放 .attr("refX", "6") // 连接点坐标 .attr("refY", "6") // 绘制标记中心圆 marker.append("circle") .attr("cx", "6") .attr("cy", "6") .attr("r", "3") .attr("fill", "white"); // 绘制标记外圆,之后在timer()中添加闪烁效果 marker.append("circle") .attr("id", "markerC") .attr("cx", "6") .attr("cy", "6") .attr("r", "5") .attr("fill-opacity", "0") .attr("stroke-width", "1") .attr("stroke", "white");
绘制中国地图,并标记起点(长沙)
地图使用的经纬集为china.json,这个文件网上有很多
// 记录长沙坐标 var changsha = projection([112.59,28.12]); // 读取地图数据,并绘制中国地图 mapdata = []; d3.json('china.json', function(error, data){ if (error) console.log(error); // 读取地图数据 mapdata = data.features; // 绘制地图 gmap.selectAll("path") .data(mapdata) .enter() .append("path") .attr("d", path); // 标记长沙 gmap.append("circle").attr("id","changsha") .attr("cx", changsha[0]) .attr("cy", changsha[1]) .attr("r", "6") .attr("fill", "yellow") gmap.append("circle").attr("id","changshaC") .attr("cx", changsha[0]) .attr("cy", changsha[1]) .attr("r", "10") .attr("stroke-width", "2") .attr("fill-opacity", "0"); });
创建方法,绘制一条从指定起点到终点的连线,并在络点绘制marker标记。
// 创建对象,保存每个城市的物流记录数量 var citylist = new Object(); // 创建方法,输入data坐标,绘制发射线 var moveto = function(city, data){ var pf = {x:projection([112.59,28.12])[0], y:projection([112.59,28.12])[1]}; var pt = {x:projection(data)[0], y:projection(data)[1]}; var distance = Math.sqrt((pt.x - pf.x)**2 + (pt.y - pf.y)**2); if (city in citylist){ citylist[city]++; }else{ mline.append("line") .attr("x1", pf.x) .attr("y1", pf.y) .attr("x2", pt.x) .attr("y2", pt.y) .attr("marker-end","url(#pointer)") .style("stroke-dasharray", " "+distance+", "+distance+" ") .transition() .duration(distance*30) .styleTween("stroke-dashoffset", function(){ return d3.interpolateNumber(distance, 0); }); citylist[city] = 1; }; mline.append("circle") .attr("cx", pf.x) .attr("cy", pf.y) .attr("r", 3) .transition() .duration(distance*30) .attr("transform", "translate("+(pt.x-pf.x)+","+(pt.y-pf.y)+")") .remove(); };
创建动画队例,实现标记外圈的闪烁效果
var scale = d3.scaleLinear(); scale.domain([0, 1000, 2000]) .range([0, 1, 0]); var start = Date.now(); d3.timer(function(){ var s1 = scale((Date.now() - start)%2000); // console.log(s1); gmap.select("circle#changshaC") .attr("stroke-opacity", s1); marker.select("circle#markerC") .attr("stroke-opacity", s1); });
创建测试按钮和测试的目标城市数据
var cityordinate = { '哈尔滨':[126.5416150000,45.8088260000], '石家庄':[116.46,39.92], '北京':[116.39564503787867,39.92998577808024], '上海':[121.480539,31.235929], '广州':[113.271431,23.135336], '重庆':[106.558434,29.568996], '青岛':[120.38442818368189,36.10521490127382], '福州':[119.30347,26.080429], '兰州':[103.840521,36.067235], '贵阳':[106.636577,26.653325], '成都':[104.081534,30.655822], '西安':[108.946466,34.347269], '长春':[125.3306020000,43.8219540000], '台湾':[120.961454,23.80406], '呼和浩特':[111.7555090000,40.8484230000], '澳门':[113.5494640000,22.1929190000], '武汉':[114.3115820000,30.5984670000], '昆明':[102.71460113878045,25.049153100453159], '乌鲁木齐':[87.56498774111579,43.84038034721766], '益阳':[112.36654664522563,28.58808777988717], '南京':[118.77807440802562,32.05723550180587], '武昌':[114.35362228468498,30.56486029278519], }; // 随机获得目标城市 var cityname = [], total = 0; for (var key in cityordinate){ cityname[total++] = key; }; // 创建操作按钮,每次点击发射一条物流线 button.append("circle") .attr("cx", width*0.9) .attr("cy", height*0.8) .attr("r", width/20) .attr("text","click") .attr("fill", "grey"); button.append("text") .attr("x", width*0.87) .attr("y", height*0.81) .style("font-size", "30px") .text("click"); button.on("click", function(){ var _index = ~~(Math.random() * total); moveto(cityname[_index], cityordinate[cityname[_index]]); });
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持亿速云。
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