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  • [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;
    <!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>
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  • 原文地址:https://www.cnblogs.com/Answer1215/p/4552013.html
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