D3js-绘制地图时出现过小, 设置scale还是无效 的解决方法
使用d3绘制某个地市的地图时，把scale成非常大但是还是无法达到想要的效果。
//-------------------------------------------------------------
//获得地图的中心 获得center
function getCenters(features){
var longitudeMin = 100000;//最小经度值
var latitudeMin = 100000;//最小纬度值
var longitudeMax = 0;//最大经度值
var latitudeMax = 0;//最大纬度值
features.forEach(function(e){
var a = d3.geo.bounds(e);//[为某个对象计算经纬度 d3.geo.bounds - compute the latitude-longitude bounding box for a given feature]
if(a[0][0] < longitudeMin) {
longitudeMin = a[0][0];
}
if(a[0][1] < latitudeMin) {
latitudeMin = a[0][1];
}
if(a[1][0] > longitudeMax) {
longitudeMax = a[1][0];
}
if(a[1][1] > latitudeMax) {
latitudeMax = a[1][1];
}
}); var a = (longitudeMax + longitudeMin)/2;
var b = (latitudeMax + latitudeMin)/2; return [a, b];
} //设置地图的大小 获得 scale
function getZoomScale(features, width, height){
var longitudeMin = 100000;//最小经度值
var latitudeMin = 100000;//最小纬度值
var longitudeMax = 0;//最大经度值
var latitudeMax = 0;//最大纬度值
features.forEach(function(e){
var a = d3.geo.bounds(e);//[为某个对象计算经纬度 d3.geo.bounds - compute the latitude-longitude bounding box for a given feature]
if(a[0][0] < longitudeMin) {
longitudeMin = a[0][0];
}
if(a[0][1] < latitudeMin) {
latitudeMin = a[0][1];
}
if(a[1][0] > longitudeMax) {
longitudeMax = a[1][0];
}
if(a[1][1] > latitudeMax) {
latitudeMax = a[1][1];
}
}); var a = longitudeMax-longitudeMin;
var b = latitudeMax-latitudeMin;
/*if(a > b) { //
return width/a;
} else {
return height/b;
}*/ return Math.min(width/a, height/b);
}
实例运用：
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>"> <title>d3-吉安市地图</title> <meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
<style type="text/css">
.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;
} </style> <script type="text/javascript" src="js/d3/d3.js"></script>
<script type="text/javascript" src="js/d3/d3.min.js"></script> </head> <body>
<script type="text/javascript">
var width = 1000;
var height = 1000; var svg =d3.select("body").append("svg")
.attr("width",width)
.attr("height",height);
//-------------------------------------------------------------
//获得地图的中心
function getCenters(features){
var longitudeMin = 100000;
var latitudeMin = 100000;
var longitudeMax = 0;
var latitudeMax = 0;
features.forEach(function(e){
var a = d3.geo.bounds(e);
if(a[0][0] < longitudeMin) {
longitudeMin = a[0][0];
}
if(a[0][1] < latitudeMin) {
latitudeMin = a[0][1];
}
if(a[1][0] > longitudeMax) {
longitudeMax = a[1][0];
}
if(a[1][1] > latitudeMax) {
latitudeMax = a[1][1];
}
}); var a = (longitudeMax + longitudeMin)/2;
var b = (latitudeMax + latitudeMin)/2; return [a, b];
} //设置地图的大小
function getZoomScale(features, width, height){
var longitudeMin = 100000;
var latitudeMin = 100000;
var longitudeMax = 0;
var latitudeMax = 0;
features.forEach(function(e){
var a = d3.geo.bounds(e); if(a[0][0] < longitudeMin) {
longitudeMin = a[0][0];
}
if(a[0][1] < latitudeMin) {
latitudeMin = a[0][1];
}
if(a[1][0] > longitudeMax) {
longitudeMax = a[1][0];
}
if(a[1][1] > latitudeMax) {
latitudeMax = a[1][1];
}
}); var a = longitudeMax-longitudeMin;
var b = latitudeMax-latitudeMin; return Math.min(width/a, height/b);
} //读取json文件 d3.json("data/jian.json",function(error,data)
{
if(error)
console.log(data); var centers = getCenters(data.features);
var zoomScale = getZoomScale(data.features, width, height); //alert("center:"+centers+",zoomscale:"+zoomScale);
//orthographic 正射
//先定义一个投影
var projection = d3.geo.mercator()
.center(
centers//
//[107,30]
) .translate([width/4,height/5])
.scale(//50*15
zoomScale*18
); //通过投影函数生成地理路径生成器
var path = d3.geo.path()
.projection(projection); //缩放
function zoomed ()
{
d3.select(this).attr("transform",//"translate(110,40)scale("+d3.event.scale+")"
"translate("+d3.event.translate+")scale("+d3.event.scale+")"
);
} var zoom = d3.behavior.zoom()
.scaleExtent([1,20])
.on("zoom",zoomed); var drag = d3.behavior.drag()
.origin(function(d){return d;})
.on("drag",draged); var jian = svg.append("g")
.attr(function(d)
{
d.dx=110;
d.dy=40;
})
.call(zoom)
//.call(drag)
; //实现可拖拽
function draged(d)
{
d.dx+=d3.event.dx;
d.dy+=d3.event.dy; d3.select(this)
.attr("transform","translate("+d.dx+","+d.dy+")");
} var color = d3.scale.category20c(); //tooltip-div 提示框
var tooltip =d3.select("body").append("div")
.attr("class","tooltip")
.attr("opacity",0.0)
//.attr("position","absolute")
; var city = jian.selectAll("path")
.data(data.features) //数据
.enter()
.append("path")
.attr("fill",function(d,i)
{
return color(i);
})
/* .each(function(d,i)
{
d3.select(this)
.append("text")
.text(function(d,i)
{
return d.properties.name;
});
}
) */
.attr("d",path) /* .append("title")
.text(function(d,i)
{
return d.properties.name;
}) */
.on("mouseover",function(d,i)
{
d3.select(this).attr("fill","#ccc"); /* if(d.properties.name=="泰和县")
{
d3.select(this)
.append("circle")
.attr("r",5);
} */ tooltip.html(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);
})
//---------------
/* .selectAll("text")
.data(data.features)
.enter()
.append("text")
.text(function(d)
{
return d.properties.name;
})
.attr("transform",function(d)
{
//alert(d.geometry.coordinates[0][0][0][0]);
//alert(d.geometry.coordinates[0][0][0]);
var coor=projection(d.geometry.coordinates[0][0][0]);
//alert();
return "translate("+coor+")";
// y=y+20;
//return "translate("+x+","+y+")";
})
//.attr("text-anchor","middle")
.style("font-size",16)
.style("fill","#ccc")
.attr("opacity",1.0) */
//-------------------------------- ; var x=0;
var y=0;
var count=0;
//var coor;
var xArray=[];
var yArray=[]; jian.selectAll("text")
.data(data.features)
.enter()
.append("text")
.text(function(d,i)
{ //x=d3.mean(d.geometry.coordinates[0][0][0][0]);
//alert(x);
return d.properties.name;
}) /* .attr("x",function(d,i)
{
return d.geometry.coordinates[0][0];
})
.attr("y",function(d,i)
{
return d3.mean(d.geometry.coordinates[0][0]);
}) */ .attr("transform",function(d,i)
{ /* xArray[i]=d.geometry.coordinates[0][0][0][0];
yArray[i]=d.geometry.coordinates[0][0][0][1];
alert(xArray); return "translate("+d3.mean(xArray)+","+(d3.mean(yArray))+")"; */ var coor=projection(d.geometry.coordinates[0][0][0]);
if( d.properties.name =="遂川县")
return "translate("+coor[0]+","+(coor[1]-40)+")"; if( d.properties.name =="吉州区") return "translate("+(coor[0]-40)+","+(coor[1]+20)+")"; return "translate("+(coor[0]-10)+","+(coor[1]+40)+")"; })
//.attr("text-anchor","middle")
.style("font-size",16)
.style("fill","black")
; }); </script> </body>
</html>
效果图：
jian.json文件内容：(编码为 UTF-8)
{"type": "FeatureCollection", "features": [
{"type":"Feature","properties":
{"name":"安福县","id":"360829"},"geometry":
{"type":"MultiPolygon","coordinates":
[[[[114.531881132813,27.5683815742188],[114.608267851563,27.5547682929688],[114.629332304688,27.5294118476563],[114.677198515625,27.5967897773438],[114.71834109375,27.6009841132813],[114.737345,27.593843],[114.743013945313,27.5484841132813],[114.722896757813,27.5142653632813],[114.731793242188,27.4882888007813],[114.744781523438,27.4778884101563],[114.778956328125,27.4311061835938],[114.783590117188,27.3938430000001],[114.781724882813,27.378843],[114.784210234375,27.3588430000001],[114.781724882813,27.338843],[114.783248320313,27.3265773750001],[114.744327421875,27.2954103828125],[114.731617460938,27.2652516914063],[114.670054960938,27.2160182929688],[114.616265898438,27.2227077460938],[114.628785429688,27.1220827460938],[114.5922278125,27.1080324531251],[114.572144804688,27.1198390937501],[114.554874296875,27.098266828125],[114.502896757813,27.0782888007813],[114.447345,27.073843],[114.418248320313,27.0787868476562],[114.38298953125,27.12948753125],[114.343143339844,27.1602419257812],[114.322345,27.211059796875],[114.301954375,27.2080471015625],[114.282110625,27.2200173164063],[114.267240019531,27.2007521796876],[114.202120390625,27.2197389960938],[114.18298953125,27.20819846875],[114.144842558594,27.1925881171876],[114.127345,27.223843],[114.131790800781,27.2293971992188],[114.153619414063,27.2468752265625],[114.132869902344,27.3195314765626],[114.11373171875,27.3171486640626],[114.092899199219,27.3293971992188],[114.071790800781,27.3382888007813],[114.062899199219,27.3593971992188],[114.051790800781,27.3682888007813],[114.042899199219,27.3793971992188],[114.017415800781,27.3901345039063],[114.027345,27.4338430000001],[114.166610136719,27.4396584296876],[114.192535429688,27.4886525703125],[114.202154570313,27.5190334296875],[114.212535429688,27.5286525703125],[114.222154570313,27.5490334296875],[114.267345,27.573843],[114.294700957031,27.5853322578125],[114.321429472656,27.5679274726563],[114.343260527344,27.5597585273437],[114.362691679688,27.54710471875],[114.371673613281,27.5601149726563],[114.402183867188,27.5532741523438],[114.442066679688,27.5700270820313],[114.461138945313,27.5657497382812],[114.49326296875,27.5879274726563],[114.509439726563,27.61136253125],[114.527345,27.603843],[114.531881132813,27.5683815742188]]]]}},{"type":"Feature","properties":{"name":"吉安县","id":"360821"},"geometry":{"type":"MultiPolygon","coordinates":[[[[114.797345,27.6238430000001],[114.797345,27.613843],[114.807345,27.613843],[114.81326296875,27.6097585273438],[114.8241028125,27.5940529609376],[114.852388945313,27.5877126289063],[114.877345,27.593843],[114.883985625,27.580483625],[114.887345,27.5438430000001],[114.87166140625,27.5393581367188],[114.872965117188,27.528843],[114.871099882813,27.5138430000001],[114.873590117188,27.493843],[114.869298125,27.459341046875],[114.919547148438,27.4381667304688],[114.937994414063,27.3569606757813],[114.914659453125,27.3172658515625],[114.97025515625,27.3241799140626],[114.951666289063,27.3092971015626],[114.952965117188,27.298843],[114.950636015625,27.2801052070313],[114.967345,27.253843],[114.931793242188,27.2293971992188],[114.91732546875,27.2113283515626],[114.892345,27.2082204414063],[114.882345,27.2094655585938],[114.867345,27.2076003242188],[114.85189578125,27.2095217109375],[114.792896757813,27.1622731757813],[114.804791289063,27.1301955390625],[114.8341028125,27.080337140625],[114.812896757813,27.0442653632813],[114.850006132813,27.0365895820312],[114.885318632813,27.0573464179688],[114.953839140625,27.0658693671875],[114.950689726563,27.0405226875],[114.987345,27.063843],[115.005030546875,27.0409279609375],[115.051129179688,27.0220607734375],[115.054381132813,27.0000637031251],[115.027345,26.963843],[115.011793242188,26.9593971992188],[114.992896757813,26.9482888007813],[114.931656523438,26.9393776679688],[114.932965117188,26.928843],[114.93150515625,26.9170827460938],[114.907345,26.9200856757813],[114.892345,26.9182204414063],[114.881983671875,26.9195095039063],[114.86021609375,26.9067116523438],[114.864039335938,26.93745628125],[114.84845828125,26.9639577460938],[114.790738554688,26.9567775703126],[114.792965117188,26.9388430000001],[114.79150515625,26.9270827460938],[114.767345,26.9300856757813],[114.71802859375,26.9239528632813],[114.682896757813,26.8982888007813],[114.651793242188,26.8893971992188],[114.614405546875,26.823266828125],[114.505050078125,26.8544924140625],[114.477345,26.843843],[114.44170046875,26.85819846875],[114.419266386719,26.913012921875],[114.423822050781,26.943843],[114.421522246094,26.9594142890626],[114.44298953125,26.96819846875],[114.473902617188,27.0082521796876],[114.45170046875,27.03819846875],[114.447345,27.073843],[114.502896757813,27.0782888007813],[114.554874296875,27.098266828125],[114.572144804688,27.1198390937501],[114.5922278125,27.1080324531251],[114.628785429688,27.1220827460938],[114.616265898438,27.2227077460938],[114.670054960938,27.2160182929688],[114.731617460938,27.2652516914063],[114.744327421875,27.2954103828125],[114.78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