I am currently working on constructing a graph that illustrates the data for the Amount of Resources utilized Per Project by creating a bar graph. I am aiming to customize the colors of the bars so that each one has its own unique color. Currently, the colors are set to scale between 2 shades of blue based on their length, but I would like each bar to be one of three specific colors. Additionally, I am exploring ways to incorporate a legend that explains the meaning behind each color used in the bar graph.
<!DOCTYPE html>
<html>
<head>
<meta>
<meta name="description" content="Creating Shapes with D3 - " />
<meta charset="utf-8">
<title>Resource Breakdown per Project</title>
<script src="http://d3js.org/d3.v3.min.js" charset="utf-8"></script>
<style type="text/css">
h1 {
font-size: 35px;
color: darkgrey;
font-family: Helvetica;
border-bottom-width: 3px;
border-bottom-style: dashed;
border-bottom-color: black;
}
h2 {
font-size: 20px;
color: black;
font-family: Helvetica;
text-decoration: underline;
margin-left: 350px;
margin-top: 0px;
}
.label {
font-size: 20px;
color: darkgrey;
font-family: "Arial Black";
border-bottom-width: 3px;
border-bottom-style: dashed;
border-bottom-color: black;
}
</style>
</head>
<body>
<h1>Resources utilized per Project</h1>
<p>Select Month:
<select id="label-option">
<option value="April">April</option>
<option value="May">May</option>
<option value="June">June</option>
<option value="July">July</option>
<option value="August">August</option>
<option value="September">September</option>
</select>
<script type="text/javascript">
var width = 800
var height = 500
var emptyVar = 0
var dataArrayProjects = ['2G', 'An', 'At', 'Au', 'AW', 'Ch', 'CI', 'CN']
var April = [0.35, 1.66, 3.04, 1.54, 3.45, 2.56, 2.29, 1.37]
var May = [0.36, 1.69, 3.08, 1.54, 3.62, 2.61, 2.22, 1.44]
var June = [0.34, 1.7, 3.08, 1.63, 3.66, 2.68, 2.24, 1.51]
var July = [0.3, 1.72, 3.17, 1.67, 3.56, 2.56, 2.17, 1.44]
var August = [0.28, 1.79, 3.18, 1.71, 3.62, 2.73, 2.26, 1.54]
var September = [1.23, 1.74, 3.12, 1.61, 3.66, 2.71, 2.2, 1.48]
d3.select("#label-option").on("change", change)
function change() {
var data = April;
if (this.selectedIndex == 1){
data = May;
} else if (this.selectedIndex == 2){
data = June;
} else if (this.selectedIndex == 3){
data = July;
} else if (this.selectedIndex == 4){
data = August;
} else if (this.selectedIndex == 5){
data = September;
}
canvas.selectAll("rect")
.data(data)
.attr("width", emptyVar)
.attr("height", 50)
.attr("fill", function(d) {
return color(d)
})
.attr("y", function(d, i) {
return i * 55
})
bars.transition()
.duration(1500)
.delay(200)
.attr("width", function(d) {
return widthScale(d);
});
texts = canvas.selectAll(".label")
.data(data)
.attr("x", function(d) {
return widthScale(d) + 10;
})
.attr("fill", function(d) {
return color(d)
})
.attr("y", function(d, i) {
return (i * 55) + 25
})
.style("opacity", 0)
.text(function(d, i) {
return d;
})
texts.transition()
.duration(2000)
.delay(180)
.style("opacity", 1)
}
var widthScale = d3.scale.linear()
.domain([0, 4])
.range([0, width - 60]);
var heightScale = d3.scale.ordinal()
.domain(dataArrayProjects)
.rangePoints([10, height - 85]);
var color = d3.scale.linear()
.domain([0, 4])
.range(["#FF5733", "#33CDFF", "#3333FF"])
var xAxis = d3.svg.axis()
.ticks("30")
.scale(widthScale);
var yAxis = d3.svg.axis()
.scale(heightScale)
.orient("left");
var canvas = d3.select("body")
.append("svg")
.attr("width", width)
.attr("height", height)
.append("g")
.attr("transform", "translate(40, 0)");
var bars = canvas.selectAll("rect")
.data(April)
.enter()
.append("rect")
.attr("width", emptyVar)
.attr("height", 50)
.attr("fill", function(d) {
return color(d)
})
.attr("y", function(d, i) {
return i * 55
})
var texts = canvas.selectAll(".label")
.data(April)
.enter()
.append("text")
.attr("class", "label")
.attr("x", function(d) {
return widthScale(d) + 10;
})
.attr("fill", function(d) {
return color(d)
})
.attr("y", function(d, i) {
return (i * 55) + 25
})
.text(function(d, i) {
return d;
})
.style("opacity", 0)
canvas.append("g")
.attr("transform", "translate(0, 430)")
.attr("font-family", "Helvetica")
.attr("font-size", "15px")
.call(xAxis);
canvas.append("g")
.attr("font-family", "Helvetica")
.attr("font-size", "15px")
.style("fill", "black")
.attr("class", "y axis")
.call(yAxis);
bars.transition()
.duration(1500)
.delay(200)
.attr("width", function(d) {
return widthScale(d);
})
texts.transition()
.duration(2000)
.delay(180)
.style("opacity", 1)
var yAxisLine = canvas.append("line")
.attr("x1", -3)
.attr("y1", 0)
.attr("x2", -3)
.attr("y2", 436)
.attr("stroke-width", 6)
.attr("stroke", "black");
</script>
<h2>Resources</h2>
</body>
</html>Is there a way to individually set the color of each bar and create a legend using these distinctive colors?
Thank you in advance!