<script src="http://d3js.org/d3.v3.js" charset="utf-8">
<script src="linechart.js" charset="utf-8">
<svg contentScriptType="text/ecmascript" width="2000" xmlns:xlink="http://www.w3.org/1999/xlink" zoomAndPan="magnify" style="background-color:#ffffff;" contentStyleType="text/css" viewBox="0 0 2000.0 2000.0" height="2000" preserveAspectRatio="xMidYMid meet" xmlns="http://www.w3.org/2000/svg" version="1.0">

//外边框
var padding = {
top : 50,right : 50,bottom : 50,left : 50
};

var names = new Array();
//计算GDP的最大值
var gdpmax = 0;
for (var i = 0; i < dataset.length; i++) {
var currGdp = d3.max(dataset[i].gdp,function (d) {
return d[1];
});
if (currGdp > gdpmax)
gdpmax = currGdp;

}
var gdpnumb = dataset[0].gdp.length;
for (var j = 0; j < gdpnumb; j++) {
names[j] = (dataset[0].gdp[j])[0];
}

alert(names);
var xScale = d3.scale.linear()
.domain([2000,2013])
.range([0,width - padding.left - padding.right]);
// var xScale = d3.scale.ordinal()
// .domain(names)
// .rangeRoundBands([0,width - padding.left - padding.right]);

var yScale = d3.scale.linear()
.domain([0,gdpmax * 1.1])
.range([height - padding.top - padding.bottom,0]);

//创建一个直线生成器
var linePath = d3.svg.line()
.x(function (d) {
return xScale(d[0]);
})
.y(function (d) {
return yScale(d[1]);
})
.interpolate("basis");

//定义两个颜色
var colors = [d3.rgb(0,255),d3.rgb(0,255,0)];

//添加路径
svg.selectAll("path") //选择
.data(dataset) //绑定数据
.enter() //选择enter部分
.append("path") //添加足够数量的元素
.attr("transform","translate(" + padding.left + "," + padding.top + ")")
.attr("d",function (d) {
return linePath(d.gdp); //返回直线生成器得到的路径
})
.attr("fill","none")
.attr("stroke-width",3)
.attr("stroke",function (d,i) {
return colors[i];
});

//添加垂直于x轴的对齐线
var vLine = svg.append("line")
.attr("class","focusLine")
.style("display","none");

//添加一个提示框
var tooltip = d3.select("body")
.append("div")
.attr("class","tooltip")
.style("opacity",0.0);

var title = tooltip.append("div")
.attr("class","title");

var des = tooltip.selectAll(".des")
.data(dataset)
.enter()
.append("div");

var desColor = des.append("div")
.attr("class","desColor");

var desText = des.append("div")
.attr("class","desText");

//添加一个透明的监视鼠标事件用的矩形
svg.append("rect")
.attr("class","overlay")
.attr("x",padding.left)
.attr("y",padding.top)
.attr("width",width - padding.left - padding.right)
.attr("height",height - padding.top - padding.bottom)
.on("mouSEOver",function () {
tooltip.style("left",(d3.event.pageX) + "px")
.style("top",(d3.event.pageY + 20) + "px")
.style("opacity",1.0);

vLine.style("display",null);
})
.on("mouSEOut",function () {
tooltip.style("opacity",0.0);
vLine.style("display","none");
})
.on("mousemove",mousemove);

function mousemove() {
/ 当鼠标在透明矩形内滑动时调用 /

//折线的源数组
var data = dataset[0].gdp;

//获取鼠标相对于透明矩形左上角的坐标，左上角坐标为(0,0)
var mouseX = d3.mouse(this)[0] - padding.left;
var mouseY = d3.mouse(this)[1] - padding.top;

//通过比例尺的反函数计算原数据中的值，例如x0为某个年份，y0为GDP值
var x0 = xScale.invert(mouseX);
var y0 = yScale.invert(mouseY);

//对x0四舍五入，如果x0是2005.6，则返回2006；如果是2005.2，则返回2005
x0 = Math.round(x0);

//查找在原数组中x0的值，并返回索引号
var bisect = d3.bisector(function (d) {
return d[0];
}).left;
var index = bisect(data,x0);

//获取年份和gdp数据
var year = x0;
var gdp = [];

for (var k = 0; k < dataset.length; k++) {
gdp[k] = {
country : dataset[k].country,value : dataset[k].gdp[index][1]
};
}

//设置提示框的标题文字（年份）
title.html("

" + year + "年

//设置颜色标记的颜色
desColor.style("background-color",i) {
return colors[i];
});

//设置描述文字的内容
desText.html(function (d,i) {
return gdp[i].country + "\t" + "

" + gdp[i].value + "

//设置提示框的位置
tooltip.style("left",(d3.event.pageY + 20) + "px");

//获取垂直对齐线的x坐标
var vlx = xScale(data[index][0]) + padding.left;

//设定垂直对齐线的起点和终点
vLine.attr("x1",vlx)
.attr("y1",padding.top)
.attr("x2",vlx)
.attr("y2",height - padding.bottom);
}

var markStep = 80;

var gMark = svg.selectAll(".gMark")
.data(dataset)
.enter()
.append("g")
.attr("transform",i) {
return "translate(" + (padding.left + i * markStep) + "," + (height - padding.bottom + 40) + ")";
});

gMark.append("rect")
.attr("x",0)
.attr("y",0)
.attr("width",10)
.attr("height",10)
.attr("fill",i) {
return colors[i];
});

gMark.append("text")
.attr("dx",15)
.attr("dy",".5em")
.attr("fill","black")
.text(function (d) {
return d.country;
});

//x轴
var xAxis = d3.svg.axis()
.scale(xScale)
.ticks(5)
.tickFormat(d3.format("d"))
.orient("bottom");

//y轴
var yAxis = d3.svg.axis()
.scale(yScale)
.orient("left");

svg.append("g")
.attr("class","axis")
.attr("transform"," + (height - padding.bottom) + ")")
.call(xAxis);

svg.append("g")
.attr("class","y axis")
.attr("transform"," + padding.top + ")")
.call(yAxis);

function updateLineChart() {

this.update = function (updateData) {
//xScale.domain(updateData,function(d){return d.name});
var numValues = updateData.length;
var updategdpmax = 0;
for (var i = 0; i < updateData.length; i++) {
var currGdp = d3.max(updateData[i].gdp,function (d) {
return d[1];
});
if (currGdp > updategdpmax)
updategdpmax = currGdp;
}

yScale = d3.scale.linear()
.domain([0,updategdpmax * 1.1])
.range([height - padding.top - padding.bottom,0]);
yAxis = d3.svg.axis()
.scale(yScale)
.orient("left");
svg.selectAll("g.y.axis")
.call(yAxis);

svg.selectAll("path") //选择
.data(updateData) //绑定数据
.transition()
.duration(2000)
.ease("linear")
.attr("d",function (d) {

return linePath(d.gdp); //返回直线生成器得到的路径
});

}

}
return new updateLineChart();
}