摘要:因為地圖數(shù)據(jù)過于龐大,例子中刪除了除北京外其他的地市信息。所以,請點擊北京查看效果,其他省沒效果。最終效果點擊北京市查看效果,其他區(qū)域切換效果,空白區(qū)域返回全國。
使用d3.js實現(xiàn)中國地圖及中國地圖下鉆到省市區(qū)
在可視化開發(fā)中,地圖是很重要的一個環(huán)節(jié),很多時候需要展現(xiàn)的不僅是國家地圖,還需要能從國家進入到省市,看到區(qū)這樣的下鉆過程,今天我們就來實現(xiàn)這個效果。
最終效果因為地圖數(shù)據(jù)過于龐大,例子中刪除了除北京外其他的地市信息。所以,請點擊北京查看效果,其他省沒效果。
點擊北京市查看效果,其他區(qū)域切換效果,空白區(qū)域返回全國。
http://en.jsrun.net/mviKp/show
這里只展示部分數(shù)據(jù),文章末尾會有完整數(shù)據(jù)
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格式化后,可以看出這個json文件比其他地圖json中,多了兩個屬性。
scale,這個區(qū)域的縮放系數(shù)。
childNum,下級包含的個數(shù)。
var height = 600; var width = 600; var texts,centered; var color = { lineColor:"#4AFFFE", pointColor:"#fbcd2c", lightColor:"#4affff", areaColor:["#09373a","#11545c","#0b6c79","#769398"], locationBgColor:"#0e403f", pointTextColor:"#fff", haveSelectColor:"#1c2b2b" }; var scale = 1; var projection = d3.geo.mercator() .center([100, 36]) .scale(800) .translate([width / 2, height / 2]); var path = d3.geo.path() .projection(projection); var svg = d3.select("#map").append("svg") .attr("id","mapSvg") .attr("width",width) .attr("height",height); svg.append("rect") .attr("class", "background") .attr("width", width) .attr("height", height) .on("click", clicked); var mapG = svg.append("g") .attr("id","mapG"); mapG.selectAll("path") .data(chinajson.features) .enter() .append("path") .attr("stroke",color.lineColor) .attr("stroke-width", 1) .attr("fill","#000") .attr("id", function(d) { return "path" + d.properties.id; }) .attr("style","display:block") .attr("class", function(d) { if (d.properties.id.length > 2) { return "location" }else{ return "distribution" } }) .attr("style","cursor:pointer;") .attr("d", path) .on("mouseover", function(d){ d3.select(this).attr("stroke-width",5/self.scale + "px"); d3.select(this).attr("stroke",color.pointColor); }) .on("mouseout",function(d){ if(d3.select(this).attr("active") == "false" || d.properties.id.length<=2 || !d3.select(this).attr("active")) { d3.select(this) .attr("stroke", color.lineColor) .attr("stroke-width",1/scale + "px"); } }) .on("click",function(d){ if(d.properties.id.length<=2){ clicked(d) }; if(d.properties.id.length>2){ d3.select(".point-info").attr("style","display:block;"); mapG.selectAll("path") .attr("stroke",color.lineColor) .attr("stroke-width",1/scale + "px") .attr("active","false"); d3.select(this) .attr("stroke",self.color.pointColor) .attr("stroke-width",5/scale + "px") .attr("active","true"); } }); texts = mapG.append("g") .attr("class", "texts") .selectAll("text") .data(chinajson.features) .enter().append("text") .attr("class", function(d) { if (d.properties.id.length > 2) { return "location" }else{ return "distribution" } }) .text(function(d) { return d.properties.name; }) .attr("id", function(d) { return "text" + d.properties.id; }) .attr("transform", function(d) { var centroid = path.centroid(d), x = centroid[0], y = centroid[1]; return "translate(" + x + ", " + y + ")"; }) .attr("fill", "#1E9AAD") .attr("font-size", "14px") .attr("style","cursor:pointer;"); d3.selectAll(".location").attr("style","display:none");
和普通的繪制沒太大區(qū)別,區(qū)別在于利用每一塊的properties屬性中id的長度分辨其層級,比如北京的id長度是2,海淀區(qū)的id長度是6.
實現(xiàn)點擊縮放function clicked(d) { var x, y, k; if (d && centered !== d) { var centroid = path.centroid(d); x = centroid[0]; y = centroid[1]; if(d.properties.id == "46"){ y = y+10; } if(d.properties.scale){ k = d.properties.scale; }else{ k=scale } scale = k; centered = d; $(".re-show").css("display","block"); mapChange("open",d); } else { x = width / 2; y = height / 2; k = 1; scale = 1; centered = null; $(".re-show").css("display","none"); mapChange("close"); } mapG.selectAll("path") .classed("active", centered && function(d) { return d === centered; }); mapG.transition() .duration(750) .attr("transform", "translate(" + width / 2 + "," + height / 2 + ")scale(" + k + ")translate(" + -x + "," + -y + ")") .style("stroke-width", 1.5 / k + "px"); }
這個縮放看起來復雜其實很簡單,就是放大整個地圖,并把地圖的中心位置改為當前點擊省市的中心,這樣看起來就會有點哪里哪里放大的效果。因為不同省市的區(qū)域面積不相同,所以不同的省市放大的倍數(shù)也不相同,這時就要根據(jù)json中的scale來確定放大的倍數(shù)。
地圖縮放變化所帶來的其他改變function mapChange(flag, d) { if (flag == "open") { var disId = d.properties.id; if (disId.length < 3) { chinajson.features.forEach(function(n) { if (n.properties.id.length > 2 && n.properties.id.substr(0, 2) === disId) { d3.select("#path" + n.properties.id) .attr("style", "display:block") .attr("stroke-width", 1 / scale + "px") .attr("fill", "#1b5c5b"); d3.select("#text" + n.properties.id) .attr("style", "display:block") .attr("font-size", 0.8 + "px"); } else { if (n.properties.id.length <= 2 && n.properties.id != disId) { d3.select(".point-info").attr("style", "display:none;"); d3.select("#path" + n.properties.id) .attr("style", "opacity:0.2") .attr("stroke-width", "0.3px"); d3.select("#text" + n.properties.id) .attr("style", "display:none") .attr("font-size", "3px"); } else { d3.select("#path" + n.properties.id) .attr("style", "display:none") .attr("stroke-width", "0.2px"); d3.select("#text" + n.properties.id) .attr("style", "display:none") .attr("font-size", "1px"); } } }) } } else { d3.selectAll(".location").attr("style", "display:none"); d3.selectAll("text").attr("font-size", "14px"); d3.selectAll("path").attr("stroke-width", "1px"); d3.selectAll(".distribution").attr("style", "display:block"); } }
這里隨區(qū)域縮放變化的屬性主要有線的粗細及字體的大小,根據(jù)當前縮放倍數(shù)確定即可。
完整的地圖文件這個地圖文件是我嘔心瀝血整理及修改的。包括了全國的省市區(qū)坐標及各項屬性。望大家妥善使用。
https://pan.baidu.com/s/1eSALqSU
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