D3.js 学习（ 一）

时间：2022-10-08 08:36:32
<html>

<head>

    <meta charset="utf-8">

    <title>第三课：为柱形图添加坐标轴</title>  

    <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 src="http://d3js.org/d3.v3.min.js" charset="utf-8"></script>

<script>

var body = d3.select("body");

var width = 400;

var height = 400;

var svg = body.append("svg")

            .attr("width", 400)

            .attr("height", 400);

// 1. 比例尺   

var xScale = d3.scale.ordinal()

                .domain([0, 1, 2, 3, 4, 5, 6])

                .rangeRoundBands([0,300]);//在300个像素上平均分配

console.info(xScale(1));

// 2. 坐标轴  x

var xAxis = d3.svg.axis()

                .scale(xScale)

                .orient("bottom");

var gxAxis = svg.append("g")

                .attr("class","axis")

                .attr("transform","translate(30,300)")

                .call(xAxis);

// 3.  y轴

var yScale = d3.scale.linear()

                .domain([100, 0])

                .range([0, 250]);

var yAxis = d3.svg.axis()

                .scale(yScale)

                .orient("left");

var gyAxis = svg.append("g")

                .attr("class","axis")

                .attr("transform","translate(30,50)")

                .call(yAxis);

//绘制矩形

var dataset = [30, 20 , 10, 60, 50, 40, 33];

yScale.domain([0,100]);

var rects = svg.selectAll(".MyRect")

                .data(dataset)

                .enter()

                .append("rect")

                .attr("class","MyRect")

                .attr("transform","translate(30,50)")

                .attr("x", function(d,i){

                    return xScale(i);

                })

                .attr("y", function(d){

                    return width - 150 - yScale(d);

                })

                .attr("width",function(){

                    return xScale.rangeBand() - 4;

                })

                .attr("height",function(d){

                    return yScale(d);

                });

    var texts = svg.selectAll(".MyText")

    .data(dataset)

    .enter()

    .append("text")

    .attr("class","MyText")

    .attr("transform","translate(30,50)")

    .attr("x", function(d,i){

        return xScale(i);

    })

    .attr("y", function(d){

        return width - 150 - yScale(d);

    })

    .attr("dx",function(){

        return xScale.rangeBand()/2;

    })

    .attr("dy",function(d){

        return 15;

    })

    .text(function(d){

        return d;

    });

</script>

</body>

</html>

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