D3-test
/
index.html

<!doctype html>
<html>
<head>
  <meta charset="utf-8">

  <title>D3.js test</title>

  <!-- <link rel="stylesheet" href="css/style.css"> -->
  <script src="d3.js"></script>
<style>
	.axis path,
	.axis line{
		fill: none;
		stroke: black;
		shape-rendering: crispEdges;
	}

	.axis text {
		font-family: sans-serif;
		font-size: 11px;
	}

	.MyRect {
		fill: steelblue;
	}

	.MyText {
		fill: white;
		text-anchor: middle;
	}
</style>

</head>

<body>
<script>
var width = 400;
var height = 400;
//在 body 里添加一个 SVG 画布
var svg = d3.select("body")
	.append("svg")
	.attr("width",width)
	.attr("height",height);
//画布周边的空白
var padding = {left:30,right:30,top:20,bottom:20};
//定义一个数组
var dataset = [10,20,30,40,33,24,12,5];
//x轴的比例尺
var xScale = d3.scale.ordinal()
	.domain(d3.range(dataset.length))
	.rangeRoundBands([0,width-padding.left-padding.right]);
//y轴比例尺
var yScale = d3.scale.linear()
	.domain([0,d3.max(dataset)])
	.range([height - padding.top - padding.bottom, 0]);
//定义x轴
var xAxis = d3.svg.axis()
	.scale(xScale)
	.orient("bottom");
//定义y轴
var yAxis = d3.svg.axis()
	.scale(yScale)
	.orient("left");
//矩形之间的空白
var rectPadding = 4;
//添加矩形元素
var rects = svg.selectAll(".MyRect")
	.data(dataset)
	.enter()
	.append("rect")
	.attr("class","MyRect")
	.attr("transform","translate("+padding.left+ "," + padding.top + ")")
	.attr("x",function(d,i){
		return xScale(i)+rectPadding/2;
	})
	.attr("y",function(d){
		return yScale(d);
	})
	.attr("width",xScale.rangeBand() - rectPadding)
	.attr("height",function(d){
		return height - padding.top - padding.bottom - yScale(d)
	})
//添加文字元素
var texts = svg.selectAll(".MyText")
	.data(dataset)
	.enter()
	.append("text")
	.attr("class","MyText")
	.attr("transform","translate(" + padding.left + "," + padding.top + ")")
	.attr("x",function(d,i){
		return xScale(i) + rectPadding/2;
	})
	.attr("y",function(d){
		return yScale(d);
	})
	.attr("dx",function(){
		return (xScale.rangeBand()- rectPadding)/2;
	})
	.attr("dy",function(d){
		return 20;
	})
	.text(function(d){
		return d;
	})
//添加x轴
svg.append("g")
	.attr("class","axis")
	.attr("transform","translate(" + padding.left + "," + (height - padding.bottom) + ")")
	.call(xAxis);
//添加y轴
svg.append("g")
	.attr("class","axis")
	.attr("transform","translate(" + padding.left + "," + padding.top + ")")
	.call(yAxis);

</script>
</body>

</html>