[D3] 8. Margins

If you want ot add margins, should append graphics container in svg

    var svg = d3.select('#chartArea').append('svg')
            .attr('width', w + margin.left + margin.right)
            .attr('height', h + margin.top + margin.bottom)
            .append('g') //The last step is to add a G element which is a graphics container in SBG.
            .attr('transform', 'translate(' + margin.left + ', ' + margin.top + ')'); //Then offset that graphic element by our left and top margins.

 

Define the margin:

    var dataset = _.map(_.range(30), function(num) {
        return Math.random() * 50;
    }), //reandom generate 15 data from 1 to 50
            margin = {top: 10, bottom: 10, left: 10, right: 10},
            w = 400 - margin.left - margin.right,
            h = 300 -margin.top - margin.bottom;

 

复制代码
<!DOCTYPE html>
<html>
<head lang="en">
    <meta charset="UTF-8">
    <title></title>
    <script src="../bower_components/underscore/underscore-min.js"></script>
    <script src="../ventor/d3.min.js"></script>
    <style type="text/css">

        body
        {
            padding-top: 50px;
            padding-left: 100px;

        }

        #chartArea {
            width: 400px;
            height: 300px;
            background-color: #CCC;
        }

        .bar
        {
            display: inline-block;
            width: 20px;
            height: 75px; /* Gets overriden by D3-assigned height below */
            margin-right: 2px;
           /* fill: teal; *//* SVG doesn't have background prop, use fill instead*/
            z-index:99;
        }

    </style>
</head>
<body>
<section id="chartArea"></section>
<script>
    var dataset = _.map(_.range(30), function(num) {
        return Math.random() * 50;
    }), //reandom generate 15 data from 1 to 50
            margin = {top: 10, bottom: 10, left: 10, right: 10},
            w = 400 - margin.left - margin.right,
            h = 300 -margin.top - margin.bottom;

    var svg = d3.select('#chartArea').append('svg')
            .attr('width', w + margin.left + margin.right)
            .attr('height', h + margin.top + margin.bottom)
            .append('g') //The last step is to add a G element which is a graphics container in SBG.
            .attr('transform', 'translate(' + margin.left + ', ' + margin.top + ')'); //Then offset that graphic element by our left and top margins.

    var yScale = d3.scale.linear()
            .domain([0, d3.max(dataset) * 1.1]) //d3.max(dataset), set the max val of database
            .range([0, h]);

    var xScale = d3.scale.ordinal()
            .domain(dataset)
            .rangeBands([0,w],0.3, 0.1);

//    var colorScale = d3.scale.category20c();
    var colorScale = d3.scale.quantile()
            .domain([d3.max(dataset) / 4, d3.max(dataset) / 2 , 3*d3.max(dataset) / 4, d3.max(dataset)])
            .range(["#9c9ede","#6b6ecf","#5254a3", "#393b79"]);

    svg.selectAll('div')
            .data(dataset)
            .enter()
            .append('rect')// svg doesn't have div, use rect instead
            .attr('class', "bar")
            .attr('width', xScale.rangeBand())
            .attr('x', function(each_data, index){
                return xScale(each_data);
            })
            .attr('y', function(each_data){
                return h-yScale(each_data);
            })
            .attr('height', function(each_data, i){
                return yScale(each_data);
            })
            .attr('fill', colorScale);
</script>
</body>
</html>
复制代码

 

posted @   Zhentiw  阅读(249)  评论(0)  编辑  收藏  举报
（评论功能已被禁用）
编辑推荐：
· SQL Server 2025 AI相关能力初探
· Linux系列：如何用 C#调用 C方法造成内存泄露
· AI与.NET技术实操系列（二）：开始使用ML.NET
· 记一次.NET内存居高不下排查解决与启示
· 探究高空视频全景AR技术的实现原理
阅读排行：
· 阿里最新开源QwQ-32B，效果媲美deepseek-r1满血版，部署成本又又又降低了！
· Manus重磅发布：全球首款通用AI代理技术深度解析与实战指南
· 开源Multi-agent AI智能体框架aevatar.ai，欢迎大家贡献代码
· 被坑几百块钱后，我竟然真的恢复了删除的微信聊天记录！
· AI技术革命，工作效率10个最佳AI工具
点击右上角即可分享
微信分享提示
AI IDE Trae