window.onload = function () {
console.log("使用d3版本", d3.version)
var isRun=true;
function init() {
var height = 200;
var MP3 = document.getElementById('mp3')
var Root = d3.select("#d3_root")
.insert('svg')
.attr("width", '100%')
.attr("height", height)
.on('click',function (){
if(isRun){
MP3.pause();
}else{
MP3.play();
}
isRun=!isRun;
})
var width = document.getElementById('d3_root').clientWidth;
console.log(width);
var lisLength = width / 10;
//生成随机数组
var list = random(lisLength)
console.log(list)
//创建x y 比例尺
var x = d3.scaleLinear()
.domain([0, lisLength])
.range([0, width])
var y = d3.scaleLinear()
.domain([0, 1])
.range([0, height])
var color = d3.scaleOrdinal(d3.schemeCategory20b);
//渲染柱状图
var rectG = Root
.append("g");
rectG.selectAll('rect')
.data(list)
.enter()
.append('rect')
.attr('x', function (d, i) { console.log(d); return x(i) })
.attr('y', function (d, i) { return 200 - y(d) })
.attr('width', function (d, i) { return 10 })
.attr('height', function (d, i) { return y(d) })
.attr('fill', function (d, i) { return color(i % 20) })
//更新柱状图
setInterval(myInterval, 150);//1000为1秒钟
function myInterval() {
if(!isRun){
return;
}
//更新随机数据
var list = random(lisLength)
var rects = rectG.selectAll('rect')
.data(list)
//开始过渡
rects.transition()
.duration(130)
.attr('y', function (d, i) { return 200 - y(d) })
.attr('height', function (d, i) { return y(d) })
}
}
function random(lisLength) {
var list = [];
for (i = 0; i < lisLength; i++) {
list.push(Math.random())
}
return list;
}
init();
}
demo演示地址
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