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@nbremer
Last active July 18, 2024 18:34
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Radar Chart Redesign
height: 600
license: mit
acknowledgement: Please add "Nadieh Bremer | Visual Cinnamon" to your credit when re-using this code, thank you!

A new design for a radar chart in D3.js. You can read more about in on the blog I wrote "A different look for the D3 radar chart"

An older version of a radar chart that I adjusted two years ago when I was just starting to learn D3.js can be found here

<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html;charset=utf-8"/ >
<title>Smoothed D3.js Radar Chart</title>
<!-- Google fonts -->
<link href='http://fonts.googleapis.com/css?family=Open+Sans:400,300' rel='stylesheet' type='text/css'>
<link href='https://fonts.googleapis.com/css?family=Raleway' rel='stylesheet' type='text/css'>
<!-- D3.js -->
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.6/d3.min.js" charset="utf-8"></script>
<style>
body {
font-family: 'Open Sans', sans-serif;
font-size: 11px;
font-weight: 300;
fill: #242424;
text-align: center;
text-shadow: 0 1px 0 #fff, 1px 0 0 #fff, -1px 0 0 #fff, 0 -1px 0 #fff;
cursor: default;
}
.legend {
font-family: 'Raleway', sans-serif;
fill: #333333;
}
.tooltip {
fill: #333333;
}
</style>
</head>
<body>
<div class="radarChart"></div>
<script src="radarChart.js"></script>
<script>
/* Radar chart design created by Nadieh Bremer - VisualCinnamon.com */
//////////////////////////////////////////////////////////////
//////////////////////// Set-Up //////////////////////////////
//////////////////////////////////////////////////////////////
var margin = {top: 100, right: 100, bottom: 100, left: 100},
width = Math.min(700, window.innerWidth - 10) - margin.left - margin.right,
height = Math.min(width, window.innerHeight - margin.top - margin.bottom - 20);
//////////////////////////////////////////////////////////////
////////////////////////// Data //////////////////////////////
//////////////////////////////////////////////////////////////
var data = [
[//iPhone
{axis:"Battery Life",value:0.22},
{axis:"Brand",value:0.28},
{axis:"Contract Cost",value:0.29},
{axis:"Design And Quality",value:0.17},
{axis:"Have Internet Connectivity",value:0.22},
{axis:"Large Screen",value:0.02},
{axis:"Price Of Device",value:0.21},
{axis:"To Be A Smartphone",value:0.50}
],[//Samsung
{axis:"Battery Life",value:0.27},
{axis:"Brand",value:0.16},
{axis:"Contract Cost",value:0.35},
{axis:"Design And Quality",value:0.13},
{axis:"Have Internet Connectivity",value:0.20},
{axis:"Large Screen",value:0.13},
{axis:"Price Of Device",value:0.35},
{axis:"To Be A Smartphone",value:0.38}
],[//Nokia Smartphone
{axis:"Battery Life",value:0.26},
{axis:"Brand",value:0.10},
{axis:"Contract Cost",value:0.30},
{axis:"Design And Quality",value:0.14},
{axis:"Have Internet Connectivity",value:0.22},
{axis:"Large Screen",value:0.04},
{axis:"Price Of Device",value:0.41},
{axis:"To Be A Smartphone",value:0.30}
]
];
//////////////////////////////////////////////////////////////
//////////////////// Draw the Chart //////////////////////////
//////////////////////////////////////////////////////////////
var color = d3.scale.ordinal()
.range(["#EDC951","#CC333F","#00A0B0"]);
var radarChartOptions = {
w: width,
h: height,
margin: margin,
maxValue: 0.5,
levels: 5,
roundStrokes: true,
color: color
};
//Call function to draw the Radar chart
RadarChart(".radarChart", data, radarChartOptions);
</script>
</body>
</html>

MIT License

Copyright (c) 2024 Nadieh Bremer | Visual Cinnamon

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

/////////////////////////////////////////////////////////
/////////////// The Radar Chart Function ////////////////
/////////////// Written by Nadieh Bremer ////////////////
////////////////// VisualCinnamon.com ///////////////////
/////////// Inspired by the code of alangrafu ///////////
/////////////////////////////////////////////////////////
function RadarChart(id, data, options) {
var cfg = {
w: 600, //Width of the circle
h: 600, //Height of the circle
margin: {top: 20, right: 20, bottom: 20, left: 20}, //The margins of the SVG
levels: 3, //How many levels or inner circles should there be drawn
maxValue: 0, //What is the value that the biggest circle will represent
labelFactor: 1.25, //How much farther than the radius of the outer circle should the labels be placed
wrapWidth: 60, //The number of pixels after which a label needs to be given a new line
opacityArea: 0.35, //The opacity of the area of the blob
dotRadius: 4, //The size of the colored circles of each blog
opacityCircles: 0.1, //The opacity of the circles of each blob
strokeWidth: 2, //The width of the stroke around each blob
roundStrokes: false, //If true the area and stroke will follow a round path (cardinal-closed)
color: d3.scale.category10() //Color function
};
//Put all of the options into a variable called cfg
if('undefined' !== typeof options){
for(var i in options){
if('undefined' !== typeof options[i]){ cfg[i] = options[i]; }
}//for i
}//if
//If the supplied maxValue is smaller than the actual one, replace by the max in the data
var maxValue = Math.max(cfg.maxValue, d3.max(data, function(i){return d3.max(i.map(function(o){return o.value;}))}));
var allAxis = (data[0].map(function(i, j){return i.axis})), //Names of each axis
total = allAxis.length, //The number of different axes
radius = Math.min(cfg.w/2, cfg.h/2), //Radius of the outermost circle
Format = d3.format('%'), //Percentage formatting
angleSlice = Math.PI * 2 / total; //The width in radians of each "slice"
//Scale for the radius
var rScale = d3.scale.linear()
.range([0, radius])
.domain([0, maxValue]);
/////////////////////////////////////////////////////////
//////////// Create the container SVG and g /////////////
/////////////////////////////////////////////////////////
//Remove whatever chart with the same id/class was present before
d3.select(id).select("svg").remove();
//Initiate the radar chart SVG
var svg = d3.select(id).append("svg")
.attr("width", cfg.w + cfg.margin.left + cfg.margin.right)
.attr("height", cfg.h + cfg.margin.top + cfg.margin.bottom)
.attr("class", "radar"+id);
//Append a g element
var g = svg.append("g")
.attr("transform", "translate(" + (cfg.w/2 + cfg.margin.left) + "," + (cfg.h/2 + cfg.margin.top) + ")");
/////////////////////////////////////////////////////////
////////// Glow filter for some extra pizzazz ///////////
/////////////////////////////////////////////////////////
//Filter for the outside glow
var filter = g.append('defs').append('filter').attr('id','glow'),
feGaussianBlur = filter.append('feGaussianBlur').attr('stdDeviation','2.5').attr('result','coloredBlur'),
feMerge = filter.append('feMerge'),
feMergeNode_1 = feMerge.append('feMergeNode').attr('in','coloredBlur'),
feMergeNode_2 = feMerge.append('feMergeNode').attr('in','SourceGraphic');
/////////////////////////////////////////////////////////
/////////////// Draw the Circular grid //////////////////
/////////////////////////////////////////////////////////
//Wrapper for the grid & axes
var axisGrid = g.append("g").attr("class", "axisWrapper");
//Draw the background circles
axisGrid.selectAll(".levels")
.data(d3.range(1,(cfg.levels+1)).reverse())
.enter()
.append("circle")
.attr("class", "gridCircle")
.attr("r", function(d, i){return radius/cfg.levels*d;})
.style("fill", "#CDCDCD")
.style("stroke", "#CDCDCD")
.style("fill-opacity", cfg.opacityCircles)
.style("filter" , "url(#glow)");
//Text indicating at what % each level is
axisGrid.selectAll(".axisLabel")
.data(d3.range(1,(cfg.levels+1)).reverse())
.enter().append("text")
.attr("class", "axisLabel")
.attr("x", 4)
.attr("y", function(d){return -d*radius/cfg.levels;})
.attr("dy", "0.4em")
.style("font-size", "10px")
.attr("fill", "#737373")
.text(function(d,i) { return Format(maxValue * d/cfg.levels); });
/////////////////////////////////////////////////////////
//////////////////// Draw the axes //////////////////////
/////////////////////////////////////////////////////////
//Create the straight lines radiating outward from the center
var axis = axisGrid.selectAll(".axis")
.data(allAxis)
.enter()
.append("g")
.attr("class", "axis");
//Append the lines
axis.append("line")
.attr("x1", 0)
.attr("y1", 0)
.attr("x2", function(d, i){ return rScale(maxValue*1.1) * Math.cos(angleSlice*i - Math.PI/2); })
.attr("y2", function(d, i){ return rScale(maxValue*1.1) * Math.sin(angleSlice*i - Math.PI/2); })
.attr("class", "line")
.style("stroke", "white")
.style("stroke-width", "2px");
//Append the labels at each axis
axis.append("text")
.attr("class", "legend")
.style("font-size", "11px")
.attr("text-anchor", "middle")
.attr("dy", "0.35em")
.attr("x", function(d, i){ return rScale(maxValue * cfg.labelFactor) * Math.cos(angleSlice*i - Math.PI/2); })
.attr("y", function(d, i){ return rScale(maxValue * cfg.labelFactor) * Math.sin(angleSlice*i - Math.PI/2); })
.text(function(d){return d})
.call(wrap, cfg.wrapWidth);
/////////////////////////////////////////////////////////
///////////// Draw the radar chart blobs ////////////////
/////////////////////////////////////////////////////////
//The radial line function
var radarLine = d3.svg.line.radial()
.interpolate("linear-closed")
.radius(function(d) { return rScale(d.value); })
.angle(function(d,i) { return i*angleSlice; });
if(cfg.roundStrokes) {
radarLine.interpolate("cardinal-closed");
}
//Create a wrapper for the blobs
var blobWrapper = g.selectAll(".radarWrapper")
.data(data)
.enter().append("g")
.attr("class", "radarWrapper");
//Append the backgrounds
blobWrapper
.append("path")
.attr("class", "radarArea")
.attr("d", function(d,i) { return radarLine(d); })
.style("fill", function(d,i) { return cfg.color(i); })
.style("fill-opacity", cfg.opacityArea)
.on('mouseover', function (d,i){
//Dim all blobs
d3.selectAll(".radarArea")
.transition().duration(200)
.style("fill-opacity", 0.1);
//Bring back the hovered over blob
d3.select(this)
.transition().duration(200)
.style("fill-opacity", 0.7);
})
.on('mouseout', function(){
//Bring back all blobs
d3.selectAll(".radarArea")
.transition().duration(200)
.style("fill-opacity", cfg.opacityArea);
});
//Create the outlines
blobWrapper.append("path")
.attr("class", "radarStroke")
.attr("d", function(d,i) { return radarLine(d); })
.style("stroke-width", cfg.strokeWidth + "px")
.style("stroke", function(d,i) { return cfg.color(i); })
.style("fill", "none")
.style("filter" , "url(#glow)");
//Append the circles
blobWrapper.selectAll(".radarCircle")
.data(function(d,i) { return d; })
.enter().append("circle")
.attr("class", "radarCircle")
.attr("r", cfg.dotRadius)
.attr("cx", function(d,i){ return rScale(d.value) * Math.cos(angleSlice*i - Math.PI/2); })
.attr("cy", function(d,i){ return rScale(d.value) * Math.sin(angleSlice*i - Math.PI/2); })
.style("fill", function(d,i,j) { return cfg.color(j); })
.style("fill-opacity", 0.8);
/////////////////////////////////////////////////////////
//////// Append invisible circles for tooltip ///////////
/////////////////////////////////////////////////////////
//Wrapper for the invisible circles on top
var blobCircleWrapper = g.selectAll(".radarCircleWrapper")
.data(data)
.enter().append("g")
.attr("class", "radarCircleWrapper");
//Append a set of invisible circles on top for the mouseover pop-up
blobCircleWrapper.selectAll(".radarInvisibleCircle")
.data(function(d,i) { return d; })
.enter().append("circle")
.attr("class", "radarInvisibleCircle")
.attr("r", cfg.dotRadius*1.5)
.attr("cx", function(d,i){ return rScale(d.value) * Math.cos(angleSlice*i - Math.PI/2); })
.attr("cy", function(d,i){ return rScale(d.value) * Math.sin(angleSlice*i - Math.PI/2); })
.style("fill", "none")
.style("pointer-events", "all")
.on("mouseover", function(d,i) {
newX = parseFloat(d3.select(this).attr('cx')) - 10;
newY = parseFloat(d3.select(this).attr('cy')) - 10;
tooltip
.attr('x', newX)
.attr('y', newY)
.text(Format(d.value))
.transition().duration(200)
.style('opacity', 1);
})
.on("mouseout", function(){
tooltip.transition().duration(200)
.style("opacity", 0);
});
//Set up the small tooltip for when you hover over a circle
var tooltip = g.append("text")
.attr("class", "tooltip")
.style("opacity", 0);
/////////////////////////////////////////////////////////
/////////////////// Helper Function /////////////////////
/////////////////////////////////////////////////////////
//Taken from http://bl.ocks.org/mbostock/7555321
//Wraps SVG text
function wrap(text, width) {
text.each(function() {
var text = d3.select(this),
words = text.text().split(/\s+/).reverse(),
word,
line = [],
lineNumber = 0,
lineHeight = 1.4, // ems
y = text.attr("y"),
x = text.attr("x"),
dy = parseFloat(text.attr("dy")),
tspan = text.text(null).append("tspan").attr("x", x).attr("y", y).attr("dy", dy + "em");
while (word = words.pop()) {
line.push(word);
tspan.text(line.join(" "));
if (tspan.node().getComputedTextLength() > width) {
line.pop();
tspan.text(line.join(" "));
line = [word];
tspan = text.append("tspan").attr("x", x).attr("y", y).attr("dy", ++lineNumber * lineHeight + dy + "em").text(word);
}
}
});
}//wrap
}//RadarChart
@abhishek0196
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I can use it whit angular 8 ? if yes how translate all this code to new version acceptable in angular 8 , i'm trying build a webcomponent and call them on angular app but that's not work

can you reproduce your code and put a lint here ?

@kenjenlee
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A slight change to Line 226 from .text(Format(d.value)) to .text(Format(i.value)) might be needed to get the correct values to show up on mouseover, instead of NaN%

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