我是d3的新手,正在尝试通过条形图中的所有条形图绘制均线,但并不能完全做到这一点。下面是我的代码:
<!DOCTYPE html>
<html>
<head>
<meta charset=utf-8 />
<title>JS Bin</title>
<style>
body {
font: 10px sans-serif;
}
.axis path,
.axis line {
fill: none;
stroke: #000;
shape-rendering: crispEdges;
}
.bar {
fill: steelblue;
}
.x.axis path {
display: none;
}
.line {
fill: none;
stroke: #444;
stroke-width: 1.5px;
}
</style>
</head>
<body>
<script src="//cdnjs.cloudflare.com/ajax/libs/d3/3.4.11/d3.min.js"></script>
<script>
var data=[
{"letter": "BU", "higher": .08,"lower": .05},
{"letter": "AU", "higher": .05,"lower": .03},
{"letter": "LA", "higher": .04,"lower": .02}
]
var margin = {top: 20, right: 20, bottom: 30, left: 40},
width = 960 - margin.left - margin.right,
height = 500 - margin.top - margin.bottom;
var formatPercent = d3.format(".0%");
var x = d3.scale.ordinal()
.rangeRoundBands([0, width], .1);
var x2 = d3.scale.ordinal()
.rangeBands([0, width], 0);
var y = d3.scale.linear()
.range([height, 0]);
var xAxis = d3.svg.axis()
.scale(x)
.orient("bottom");
var yAxis = d3.svg.axis()
.scale(y)
.orient("left")
.tickFormat(formatPercent);
var svg = d3.select("body").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 + ")");
data.forEach(function(d) {
d.higher = +d.higher;
d.lower = +d.lower;
});
x.domain(data.map(function(d) { return d.letter; }));
x2.domain(data.map(function(d) { return d.letter; }));
y.domain([0, d3.max(data, function(d) { return d.higher; })]);
svg.append("g")
.attr("class", "x axis")
.attr("transform", "translate(0," + height + ")")
.call(xAxis);
svg.append("g")
.attr("class", "y axis")
.call(yAxis)
.append("text")
.attr("transform", "rotate(-90)")
.attr("y", 6)
.attr("dy", ".71em")
.style("text-anchor", "end")
.text("Frequency");
svg.selectAll(".bar")
.data(data)
.enter().append("rect")
.attr("class", "bar")
.attr("x", function(d) { return x(d.letter); })
.attr("width", x.rangeBand())
.attr("y", function(d) { return y(d.higher); })
.attr("height", function(d) { return height - y(d.higher-d.lower); });
var dataSum = d3.mean(data, function(d) { return (d.higher + d.lower); });
var line = d3.svg.line()
.x(function(d, i) {
return x(d.letter) + i; })
.y(function(d, i) { return y(dataSum/data.length); });
svg.append("path")
.datum(data)
.attr("class", "line")
.attr("d", line);
</script>
</body>
</html>
正确的代码在这里' http://jsbin.com/beyakumohi/1/edit?html '。该线应穿过每个小节的中心,但仅在第三个小节处发生,并且也不会穿过该小节。我的代码有什么错误吗?
d3.mean将为您提供整个数组的平均值。意思是,在这种情况下,您将得到:
data[0].higher + data[0].lower + data[1].higher + data[1].lower + data[2].higher + data[2].lower
在这种情况下,我会说更合适地按如下方式编辑您的线路功能
var line = d3.svg.line()
.x(function(d, i) {
return x(d.letter); })
.y(function(d, i) { return y((d.higher + d.lower) / 2); });
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