d3之柱状图封装

效果图如下：

p1.png

1. 数据准备

var dataset=[50,30,60,70,20,80,100];
var xlabel=['0~50','50~100','100~200','200~500','500~1000','1000~2000','>2000'];

2. 封装方法

function drawRect(divId,dataset,xlabel) {
        var _svg = d3.select("#"+divId)
            .append("svg")
            .attr("width","100%")
            .attr("height","100%");
        var _gAll = _svg.append("g")
                .attr("transform","translate(25,25)");

        var _gyaxis = _gAll.append("g")
                .attr("id","gyaxis")
                .attr("transform","translate(50,50)");
        var _linescale = d3.scaleLinear()
                                .domain([0,100]).nice()//nice用来优化数据  四舍五入等
                                .range([150,0])//亦可以用rangeRound输出整数
                                .clamp(true);
        var _yaxis = d3.axisLeft()
                .scale(_linescale)
                //.ticks(5)
                        .tickValues([0,25,50,75,100])
                //.tickFormat(d3.format("%"))
                ;
        _yaxis(_gyaxis);
        d3.select("#gyaxis")
                .selectAll("text")
                .attr("fill","blue")
                //.style("font-size","24px")
                // .style("transform","rotate(-45deg)")
                ;
        d3.select("#gyaxis")
                .selectAll("line")
                .attr("stroke","blue");
        d3.select("#gyaxis")
                .selectAll("path")
                .attr("stroke","blue");
        var _gxaixs = _gAll.append("g")
                .attr("id","gxaxis")
                .attr("transform","translate(50,200)");
        var _bandscale = d3.scaleBand()
                .paddingInner(0.2)//20%包括内外边距及段间距paaddingInner只包括段间距
                .domain(xlabel)
                .range([0,450]);
        var _xaxis = d3.axisBottom()
                .scale(_bandscale);
        _xaxis(_gxaixs);
        d3.select("#gxaxis")
                .selectAll("text")
                .attr("fill","blue")
                .style("transform","rotate(-45deg)")
                // .attr("dy","34px")
                .attr("dx","-34px");
        d3.select("#gxaxis")
                .selectAll("line")
                .style("stroke","blue");
        d3.select("#gxaxis")
                .selectAll("path")
                .style("stroke","blue");


        var _gchartarea = _gAll.append("g")
                .attr("transform","translate(50,50)");
        _gchartarea.append("g")
                .selectAll("rect")
                .data(dataset)
                .enter()
                .append("rect")
                .attr("x",function(d,i){
                        return  _bandscale(xlabel[i]);
                })
                .attr("y",function(d,i){
                        return 150 - _linescale(100-d);
                })
                .attr("width",_bandscale.bandwidth())
                .attr("height",function(d,i){
                        return _linescale(100-d);
                })
                .style("fill","steelblue");
        _gchartarea.append("g")
                .selectAll("text")
                .data(dataset)
                .enter()
                .append("text")
                .attr("x",function(d,i){
                        return _bandscale(xlabel[i]);
                })
                .attr("y",function(d,i){
                        return 150-_linescale(100-d);
                })
                .attr("dx",_bandscale.bandwidth()/2)
                .attr("dy","1em")
                .attr("text-anchor","middle")
                .text(function(d){return d;})
                .attr("fill","white");
        d3.select("#gyaxis")
                .selectAll("g")
                .append("line")
                .attr("x1",0)
                .attr("y1",0)
                .attr("x2",450)
                .attr("y2",0)
                .attr("stroke","grey")
                .attr("stroke-width","0.5");
    }

3. 调用方法画图

$(function(){drawRect("mychart",dataset,xlabel);});
$(window).resize(function(){
        drawRect("mychart",dataset,xlabel);
    });