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我想将图例添加到日历热图中。但是，目前该图例仅包含两个元素> 0%和> NaN%。我尝试了不同的方式来设置图例，但仍不能解决问题。如何在日历热图中添加图例
如何定义值应取自colorScale？为什么我的值为> 0%和> NaN%而不是colorScale中定义的值？
<!DOCTYPE html>
<meta charset="utf-8">
<html>
<head>
<style>
rect.bordered {
stroke: #E6E6E6;
stroke-width:2px;
}
text.mono {
font-size: 10pt;
font-family: Consolas, courier;
fill: #000;
}
text {
font-family: Consolas, courier;
font-size:1.0em;
}
text.axis-workweek {
fill: #000;
}
text.axis-worktime {
fill: #000;
}
</style>
<script src="http://d3js.org/d3.v3.js"></script>
</head>
<body>
<div id="chart"></div>
</div>
<script type="text/javascript">
var title="";
var margin = { top: 90, right: 0, bottom: 80, left: 30 },
width = 960 - margin.left - margin.right,
height = 900 - margin.top - margin.bottom,
gridSize = Math.floor(width/42),
legendElementWidth = gridSize*2,
buckets = 5,
colors = ["#c7e9b4","#41b6c4","#1d91c0","#225ea8"], // alternatively colorbrewer.YlGnBu[9]
days = ["1", "2", "3", "4", "5", "6", "7","8", "9", "10", "11", "12","13", "14", "15", "16", "17","18", "19", "20",
"21", "22","23", "24", "25", "26", "27","28", "29", "30", "31"],
times = ["7:00", "8:00", "9:00", "10:00", "11:00", "12:00", "13:00", "14:00", "15:00", "16:00", "17:00", "18:00", "19:00", "20:00", "21:00"];
datasets = ["data.tsv"];
var svg = d3.select("#chart").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 + ")");
svg.append("text")
.attr("x",0)
.attr("y",-40)
.text(title);
var dayLabels = svg.selectAll(".dayLabel")
.data(days)
.enter().append("text")
.text(function (d) { return d; })
.attr("x", 0)
.attr("y", function (d, i) { return i * gridSize; })
.style("text-anchor", "end")
.attr("transform", "translate(-6," + gridSize/1.5 + ")")
.attr("class", function (d, i) { return ((i >= 0 && i <= 4) ? "dayLabel mono axis axis-workweek" : "dayLabel mono axis"); });
var timeLabels = svg.selectAll(".timeLabel")
.data(times)
.enter().append("text")
.text(function(d) { return d; })
.attr("x", function(d, i) { return i * gridSize * 2.1; })
.attr("y", 0)
.style("text-anchor", "middle")
.attr("transform", "translate(" + gridSize/2 + ", -6)")
.attr("class", function(d, i) { return ((i >= 7 && i <= 16) ? "timeLabel mono axis axis-worktime" : "timeLabel mono axis"); });
var heatmapChart = function(tsvFile) {
d3.tsv(tsvFile,
function(d) {
return {
day: +d.day,
hour: +d.hour,
value: +d.value
};
},
function(error, data) {
var colorScale = d3.scale.threshold()
.domain([5, 10, 15])
.range(colors);
var cards = svg.selectAll(".hour")
.data(data, function(d) {return d.day+':'+d.hour;});
cards.append("title");
cards.enter().append("rect")
.attr("x", function(d) { return (d.hour - 7) * gridSize * 2.05; })
.attr("y", function(d) { return (d.day - 1) * gridSize; })
.attr("rx", 4)
.attr("ry", 4)
.attr("class", "hour bordered")
.attr("width", gridSize*2)
.attr("height", gridSize)
.style("fill", colors[0]);
cards.transition().duration(1000)
.style("fill", function(d) { return colorScale(d.value); });
cards.select("title").text(function(d) { return d.value; });
cards.exit().remove();
var legend = svg.selectAll(".legend")
.data([0].concat(colorScale), function(d) { return d; });
legend.enter().append("g")
.attr("class", "legend");
legend.append("rect")
.attr("x", height)
.attr("y", function(d, i) { return legendElementWidth * (i-0.5); })
.attr("width", gridSize/2)
.attr("height", legendElementWidth)
.style("fill", function(d, i) { return colors[i]; });
legend.append("text")
.attr("class", "mono")
.text(function(d) { return "≥ " + Math.round(d) + "%"; })
.attr("x", (height) + gridSize)
.attr("y", function(d, i) { return legendElementWidth*i; });
legend.exit().remove();
});
};
heatmapChart(datasets[0]);
</script>
</body>
</html>
这是我目前的结果是：
