日期:2014-05-16  浏览次数:20371 次

【D3.V3.js系列教程】--(十三)轴

【D3.V3.js系列教程】--(十三)轴

1、定义和创建X轴

//Define X axis
   var xAxis = d3.svg.axis()
         .scale(xScale)
         .orient("bottom");


//Create X axis
   svg.append("g")
    .call(xAxis);

效果:

2、调整X轴的样式

变成刻度尺:

.axis path,
.axis line {
    fill: none;
    stroke: black;
    shape-rendering: crispEdges;
}

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

 

调整坐标位置到下面:

svg.append("g")
    .attr("class", "axis")
    .attr("transform", "translate(0," + (h - padding) + ")")
    .call(xAxis);

效果:

3、设置最小标度

var xAxis = d3.svg.axis()
                  .scale(xScale)
                  .orient("bottom")
                  .ticks(5);  //Set rough # of ticks
效果:

4、Y轴

//Define Y axis
var yAxis = d3.svg.axis()
                  .scale(yScale)
                  .orient("left")
                  .ticks(5);

同样设置起始坐标

//Create Y axis
svg.append("g")
    .attr("class", "axis")
    .attr("transform", "translate(" + padding + ",0)")
    .call(yAxis);

效果:

5、设置刻度的格式

var formatAsPercentage = d3.format(".1%");
  xAxis.tickFormat(formatAsPercentage);

6、最后的源码

<!DOCTYPE html>
<html>
  <head>
		<meta charset="utf-8">
		<title>testD3-11-axes.html</title>
		<script type="text/javascript" src="http://localhost:8080/spring/js/d3.v3.js"></script>
	<style type="text/css">
			.axis path,
			.axis line {
				fill: none;
				stroke: black;
				shape-rendering: crispEdges;
			}
			.axis text {
				font-family: sans-serif;
				font-size: 11px;
			}
	</style>
	</head>
	<body>
		<script type="text/javascript">
//Width and height
			var w = 500;
			var h = 300;
			var padding = 20;
			
			var dataset = [
							[5, 20], [480, 90], [250, 50], [100, 33], [330, 95],
							[410, 12], [475, 44], [25, 67], [85, 21], [220, 88],
							[600, 150]
						  ];
			//Create scale functions
			var xScale = d3.scale.linear()
								 .domain([0, d3.max(dataset, function(d) { return d[0]; })