D3 值域渐变地图

float: left;

}

.div2 {

float: right;

}

.div3 {

display: none;

}

.tooltip {

font-family: simsun;

font-size: 16px;

width: 120;

height: auto;

position: absolute;

text-align: center;

border-style: solid;

border-width: 1px;

background-color: white;

border-radius: 5px;

}

.axis path,

.axis line {

fill: none;

stroke: black;

shape-rendering: crispEdges;

}

.axis text {

font-family: sans-serif;

font-size: 11px;

width: 50px;

}

.MyRect {

fill: steelblue;

}

.MyText {

fill: white;

text-anchor: middle;

}

window.onload = function () {

var width = 800;

var height = 800;

var projection;

projection = d3.geo.mercator()

.center([108, 36]) //中心点

.scale(3500) //地图大小

.translate([width / 2, height / 2 – 50]); //地图宽度和高度

var svg = d3.select(“.div1”)

.append(“svg”)

.attr(“width”, width)

.attr(“height”, height);

//投影

//投影后获得的路径

var path = d3.geo.path()

.projection(projection);

var georoot = {

“type”: “FeatureCollection”,

“features”:

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{ “type”: “Feature”, “properties”: { “id”: “6101”, “name”: “西安市”, “cp”: [109.1162, 34.2004], “childNum”: 5 }, “geometry”: { “type”: “Polygon”, “coordinates”: [[[107.6221, 33.7225], [107.677, 33.7775], [107.677, 33.8104], [107.71, 33.8489], [107.688, 33.8599], [107.699, 33.9258], [107.7649, 33.9478], [107.8088, 33.9972], [107.8418, 33.9752], [107.8967, 34.0027], [107.9187, 33.9862], [107.9517, 33.9862], [107.9407, 34.0356], [107.9956, 34.1016], [108.0066, 34.151], [108.0176, 34.1675], [108.0286, 34.2224], [108.0505, 34.2334], [108.1274, 34.2169], [108.1934, 34.2224], [108.2483, 34.2004], [108.2922, 34.2114], [108.3362, 34.1949], [108.479, 34.2059], [108.5669, 34.2279], [108.6218, 34.2609], [108.6548, 34.2609], [108.6877, 34.2389], [108.6987, 34.2719], [108.7427, 34.2773], [108.7646, 34.2938], [108.7976, 34.2938], [108.8086, 34.3652], [108.9514, 34.4202], [108.9734, 34.4916], [108.9734, 34.541], [108.9514, 34.5685], [109.0613, 34.5959], [109.1382, 34.5795], [109.1382, 34.6344], [109.1711, 34.6948], [109.292, 34.6893], [109.3469, 34.7003], [109.3579, 34.7333], [109.4128, 34.7388], [109.4458, 34.552], [109.3909, 34.53], [109.4128, 34.5026], [109.3909, 34.4751], [109.4568, 34.3927], [109.4568, 34.3048], [109.5227, 34.2554], [109.5776, 34.2609], [109.6326, 34.2389], [109.7205, 34.2389], [109.7534, 34.2114], [109.7534, 34.1949], [109.8193, 34.151], [109.7864, 34.1455], [109.7864, 34.162], [109.7424, 34.1235], [109.7424, 34.0961], [109.6655, 34.1016], [109.6326, 34.0741], [109.5667, 34.0631], [109.5337, 33.9862], [109.5996, 33.9423], [109.5996, 33.9038], [109.5007, 33.8489], [109.4458, 33.8379], [109.3579, 33.8654], [109.314, 33.8544], [109.259, 33.8818], [109.2151, 33.8654], [109.1382, 33.8708], [109.1162, 33.8763], [109.1052, 33.9038], [109.0503, 33.9203], [109.0063, 33.8873], [108.9185, 33.8708], [108.8965, 33.8379], [108.8416, 33.8159], [108.7646, 33.8049], [108.7537, 33.8379], [108.7097, 33.8269], [108.6548, 33.8434], [108.6108, 33.8269], [108.5779, 33.7665], [108.49, 33.8049], [108.4021, 33.7665], [108.3582, 33.7939], [108.1824, 33.7115], [108.0835, 33.728], [108.0505, 33.7115], [107.9517, 33.739], [107.9187, 33.7335], [107.9077, 33.7445], [107.8528, 33.6951], [107.7209, 33.728], [107.666, 33.7006], [107.6221, 33.7225]]] } },

{ “type”: “Feature”, “properties”: { “id”: “6102”, “name”: “铜川市”, “cp”: [109.0393, 35.1947], “childNum”: 2 }, “geometry”: { “type”: “Polygon”, “coordinates”: [[[108.8635, 35.343], [108.9294, 35.3705], [109.0503, 35.5463], [109.0942, 35.5408], [109.1162, 35.5682], [109.1821, 35.5792], [109.2151, 35.5737], [109.2151, 35.5353], [109.2261, 35.5243], [109.4019, 35.5188], [109.4238, 35.4968], [109.4678, 35.5078], [109.4678, 35.4803], [109.4788, 35.4694], [109.4568, 35.4584], [109.4788, 35.4364], [109.4678, 35.4199], [109.4897, 35.3979], [109.4897, 35.376], [109.5007, 35.3595], [109.4897, 35.343], [109.4019, 35.3265], [109.3689, 35.2881], [109.281, 35.2551], [109.303, 35.2496], [109.314, 35.2057], [109.3579, 35.1672], [109.4348, 35.1617], [109.4348, 35.0848], [109.4238, 35.0684], [109.3909, 35.0958], [109.303, 35.0903], [109.281, 35.1013], [109.259, 35.0519], [109.1931, 35.0299], [109.2151, 34.9915], [109.1382, 34.9915], [109.0833, 34.9585], [109.0942, 34.92], [109.0613, 34.8926], [108.9734, 34.8871], [108.9734, 34.8212], [108.9185, 34.8322], [108.8965, 34.8102], [108.8525, 34.8212], [108.8196, 34.8102], [108.7646, 34.8706], [108.7207, 34.8651], [108.6877, 34.8816], [108.6218, 35.0134], [108.5889, 35.0409], [108.6218, 35.0848], [108.6218, 35.1013], [108.6108, 35.1123], [108.6658, 35.1288], [108.6328, 35.1672], [108.6768, 35.2167], [108.7097, 35.2332], [108.7537, 35.2936], [108.8745, 35.3265], [108.8635, 35.343]]] } }

]

}

//提示框 (注意设置提示框的绝对路径)

var tooltip = d3.select(“body”)

.append(“div”)

.attr(“opacity”, 0.0)

.attr(“class”, “tooltip”)

;

//添加一个g标签

var china = svg.append(“g”);

//绘制个省份的path路径

var provinces = china.selectAll(“path”)

.data(georoot.features)

.enter()

.append(“path”)

.style(“fill”, “#ccc”)

.attr(“stroke”, “black”)

.attr(“stroke-width”, “1px”)

.attr(“d”, path);

//在地图上显示各个身份的名称

svg.selectAll(“text”)

.data(georoot.features)

.enter()

.append(“text”)

//设置各个文本(省份名称)显示的文字

.attr(“transform”, function (d, i) {

if (d.properties.id == “20”) //河北

{

return “translate(” + (path.centroid(d)[0] – 20) + “,” + (path.centroid(d)[1] + 20) + “)”;

}

return “translate(” + (path.centroid(d)[0] – 10) + “,” + path.centroid(d)[1] + “)”;

})

/* .attr(“x”, function(d) {

return (path.centroid(d)[0]-10);

})

.attr(“y”, function(d) {

if(d.properties.id ==”20″) //河北

{

return (path.centroid(d)[1]+30);

}

return (path.centroid(d)[1]);

}) */

//显示省名

.text(function (d) {

return d.properties.name;

})

.attr(“font-size”, 12);

var dataset = {

“name”: “陕西”,

“provinces”:

[

{ “name”: “榆林市”, “value”: 141 },

{ “name”: “延安市”, “value”: 222 },

{ “name”: “汉中市”, “value”: 154 },

{ “name”: “安康市”, “value”: 372 },

{ “name”: “商洛市”, “value”: 277 },

{ “name”: “宝鸡市”, “value”: 626 },

{ “name”: “渭南市”, “value”: 449 },

{ “name”: “咸阳市”, “value”: 383 },

{ “name”: “西安市”, “value”: 549 },

{ “name”: “铜川市”, “value”: 122 }

]

} //将数据保存在数组中,(数组索引号为各省的名称)

var datas = [];

var datam = [];

for (var i = 0; i < dataset.provinces.length; i++) {

var name = dataset.provinces[i].name;

var value = dataset.provinces[i].value;

datas[name] = value; //例如 datas[北京]=14149

datam.push(value); //datam 数组用于求中间值

}

//取出数据中的最大值和最小值

var maxdata = d3.max(dataset.provinces, function (d) {

return d.value;

});

var mindata = 0;

//定义一个线性比例尺

var linear = d3.scale.linear()

.domain([mindata, maxdata])

.range([0, 1]);

//定义颜色

var b = d3.rgb(130, 140, 20);

var a = d3.rgb(255, 255, 180);

//设置颜色插值

var color = d3.interpolate(a, b);

//给个省份填充颜色

provinces.style(“fill”, function (d, i) {

var t = linear(datas[d.properties.name]);

var col = color(t);

return col.toString();

})

//提示框

.on(“mouseover”, function (d, i) {

d3.select(this).attr(“fill”, “#ccc”);

tooltip.

.style(“left”, (d3.event.pageX) + “px”)

.style(“top”, (d3.event.pageY + 20) + “px”)

.style(“opacity”, 1.0);

})

.on(“mousemove”, function (d, i) {

tooltip.html(d.properties.name + “:” + datas[d.properties.name])

.style(“left”, (d3.event.pageX) + “px”)

.style(“top”, (d3.event.pageY + 20) + “px”)

.style(“opacity”, 1.0);

})

.on(“mouseout”, function (d, i) {

d3.select(this).attr(“fill”, color(i));

tooltip.style(“opacity”, 0.0);

});

//显示渐变矩形条

var defs = svg.append(“defs”);

var linearGradient = defs.append(“linearGradient”)

.attr(“id”, “linearColor”)

//颜色渐变方向

.attr(“x1”, “0%”)

.attr(“y1”, “0%”)

.attr(“x2”, “100%”)

.attr(“y2”, “0%”);

//设置矩形条开始颜色

var stop1 = linearGradient.append(“stop”)

.attr(“offset”, “0%”)

.attr(“stop-color”, a.toString());

//设置结束颜色

var stop2 = linearGradient.append(“stop”)

.attr(“offset”, “100%”)

.attr(“stop-color”, b.toString());

var colorRect = svg.append(“rect”)

//x,y 矩形的左上角坐标

.attr(“x”, 50)

.attr(“y”, 50)

//矩形的宽高

.attr(“width”, 200)

.attr(“height”, 20)

//引用上面的id 设置颜色

.style(“fill”, “url(#” + linearGradient.attr(“id”) + “)”);

//设置文字

//数据初值

var startText = svg.append(“text”)

.attr(“x”, 50)

.attr(“y”, 45)

.text(mindata);

//数据中间值

var middleText = svg.append(“text”)

.attr(“x”, 125)

.attr(“y”, 45)

.text(

//d3.mean(datam)//平均值

d3.median(datam) //中间值

);

//数据末值

var endText = svg.append(“text”)

.attr(“x”, 250)

.attr(“y”, 45)

.text(maxdata);

}