我有一个数据集,该数据集包含3个字段,分别是名称,代表范围的最小值(value2
)和最大值(value
)。
//The data
var data =[{"name": 'Scotty', "value2":0, "value":17},
{"name":'Dick', "value2":10, "value":17},
{"name":'James', "value2":5, "value":null},
{"name":'Max', "value2":2, "value":9}]
目前,我用条形图表示此代码,该代码可以正常工作,除非value2和value的点非常接近或值为空。
//Chart size parameters
var margin = {top: 20, right: 30, bottom: 90, left: 40},
width = 830 - margin.left - margin.right,
height = 500 - margin.top - margin.bottom;
//Chart axis
var x = d3.scaleBand()
.domain(data.map(function(d) { return d.name; }))
.range([2, width])
.scaleBand(0.10);
var y = d3.scaleLinear()
.domain([0, d3.max(data, function(d) { return d.value; })])
.range([height, 0]);
var xAxis = d3.axisBottom(x);
var yAxis = d3.axisLeft(y);
//Initialize chart
var chart = d3.select("#mychart").append("svg")
.attr("width", width + margin.left + margin.right)
.attr("height", height + margin.top + margin.bottom)
.append("g")
.attr("transform", "translate(" + margin.left + "," + margin.top + ")");
//Adding both axis
chart.append("g")
.attr("class", "x axis")
.attr("transform", "translate(0," + height + ")")
.call(xAxis)
chart.append("g")
.attr("class", "y axis")
.call(yAxis);
//Where the box is drawn
chart.selectAll(".box")
.data(data)
.enter().append("rect")
.attr("class", "box")
.attr("x", function(d) { return x(d.name); })
.attr("y", function(d) { return y(d.value); })
.attr("height", function(d) { return y(d.value2) - y(d.value); }) //Plot range
.attr("width", x.bandwidth()); //spacing for bars
是否可以使用以下方式绘制数据:
value
中存在一个点为空的点,则仅绘制一个点