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import * as d3 from 'd3';
import type { IRadarChartDataNode, IRadarChartOptions, TRadarChartData } from '../interfaces/radar-chart.interface';
import { generateConfiguration } from './configuration.util';
/**
* The radar chart default configuration.
*/
export const defaultRadarChartConfig: IRadarChartOptions = Object.freeze({
chartTitle: '',
width: 350,
height: 350,
margin: {
top: 50,
right: 50,
bottom: 50,
left: 50,
},
levels: 3, // how many levels or inner circles should there be drawn
maxValue: 0, // what is the value that the biggest circle will represent
lineFactor: 1.1, // how much farther than the radius of the outer circle should the lines be stretched
labelFactor: 1.15, // how much farther than the radius of the outer circle should the labels be placed
labelTextWrapWidth: 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)
transitionDuration: 200,
color: d3.scaleOrdinal(d3.schemeCategory10),
} as IRadarChartOptions);
/**
* Creates a container for the radar chart.
* @param container the chart container
* @param config the chart configuration
* @returns the object with the svg element and the g element
*/
const createContainer = (container: ElementRef<HTMLDivElement>, config: IRadarChartOptions) => {
const id = container.nativeElement.id ?? 'radar-0';
d3.select(`#${id}`).select('svg').remove();
const svg = d3
.select(`#${id}`)
.append('svg')
.attr('width', config.width + config.margin.left + config.margin.right)
.attr('height', config.height + config.margin.top + config.margin.bottom)
.attr('class', id);
const g = svg
.append('g')
.attr('transform', `translate(${config.width / 2 + config.margin.left},${config.height / 2 + config.margin.top})`);
return { svg, g };
};
/**
* Draws the radar chart circular grid.
* @param axisGrid the chart axis grid
* @param radius the chart radius value
* @param maxValue the maximum value of the chart axis
* @param config the chart configuration
*/
const drawCircularGrid = (
axisGrid: d3.Selection<SVGGElement, unknown, HTMLElement, unknown>,
radius: number,
maxValue: number,
config: IRadarChartOptions,
) => {
// background circles
axisGrid
.selectAll('.levels')
.data(d3.range(1, config.levels + 1).reverse())
.enter()
.append('circle')
.attr('class', 'grid-circle')
.attr('r', (d, i) => (radius / config.levels) * d)
.style('fill', '#CDCDCD')
.style('stroke', '#CDCDCD')
.style('fill-opacity', config.opacityCircles)
.style('filter', 'url(#glow)');
// text indicating at what % each level is
const axisGridX = 4;
axisGrid
.selectAll('.axis-label')
.data(d3.range(1, config.levels + 1).reverse())
.enter()
.append('text')
.attr('class', 'axis-label')
.attr('x', axisGridX)
.attr('y', d => (-d * radius) / config.levels)
.attr('dy', '0.4em')
.style('font-size', '10px')
.attr('fill', '#737373')
.text((d, i) => (maxValue * d) / config.levels);
};
/**
* Wraps the chart axis labels text.
* @param svgText the svg text elements
* @param width the chart axis label width
*/
const wrapSvgText = (svgText: d3.Selection<SVGTextElement, string, SVGGElement, unknown>, width: number) => {
svgText.each(function (this: SVGTextElement) {
const text = d3.select<SVGElement, string>(this);
const words = text.text().split(/\s+/).reverse();
if (words.length > 1) {
let line: string[] = [];
let lineNumber = 0;
const lineHeight = 1.4;
const y = text.attr('y');
const x = text.attr('x');
const dy = parseFloat(text.attr('dy') ?? 0);
let tspan = text.text(null).append('tspan').attr('x', x).attr('y', y).attr('dy', `${dy}em`);
let word = words.pop();
while (typeof word !== 'undefined') {
line.push(word ?? '');
tspan.text(line.join(' '));
if ((tspan.node()?.getComputedTextLength() ?? 0) > width) {
line.pop();
tspan.text(line.join(' '));
line = [word ?? ''];
lineNumber += 1;
tspan = text
.append('tspan')
.attr('x', x)
.attr('y', y)
.attr('dy', `${lineNumber * lineHeight + dy}em`)
.text(word ?? '');
}
word = words.pop();
}
}
});
};
/**
* Creates the legend.
* @param g the svg g element
* @param config the chart configuration
*/
const createLegend = (g: d3.Selection<SVGGElement, unknown, HTMLElement, unknown>, config: IRadarChartOptions) => {
if (config.chartTitle !== '') {
g.append('g')
.attr('transform', `translate(-${config.width / 2 + config.margin.left / 2}, -${config.height / 2 + config.margin.top / 2})`)
.append('text')
.style('font-size', '12px')
.attr('class', 'legend')
.text(config.chartTitle);
}
};
/**
* Draws the radar chart axis.
* @param axisGrid the chart axis grid
* @param axisNames the chart axis names
* @param radiusScale the chart radius scale
* @param maxValue the maximum value of the chart axis
* @param angleSlice the chart angle slice value
* @param config the chart configuration
*/
const drawAxis = (
axisGrid: d3.Selection<SVGGElement, unknown, HTMLElement, unknown>,
axisNames: string[],
radiusScale: d3.ScaleLinear<number, number>,
maxValue: number,
angleSlice: number,
config: IRadarChartOptions,
) => {
// create the straight lines radiating outward from the center
const axis = axisGrid.selectAll('.axis').data(axisNames).enter().append('g').attr('class', 'axis');
// append the lines
axis
.append('line')
.attr('x1', 0)
.attr('y1', 0)
.attr('x2', (d, i) => radiusScale(maxValue * config.lineFactor) * Math.cos(angleSlice * i - Math.PI / 2))
.attr('y2', (d, i) => radiusScale(maxValue * config.lineFactor) * 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', (d, i) => radiusScale(maxValue * config.labelFactor) * Math.cos(angleSlice * i - Math.PI / 2))
.attr('y', (d, i) => radiusScale(maxValue * config.labelFactor) * Math.sin(angleSlice * i - Math.PI / 2))
.text(d => d)
.call(wrapSvgText, config.labelTextWrapWidth);
};
/**
* Draws the radar chart blobs.
* @param radiusScale the chart radius scale
* @param angleSlice the chart angle slice value
* @param g the svg g element
* @param data the chart data
* @param config the chart configuration
*/
const drawRadarChartBlobs = (
radiusScale: d3.ScaleLinear<number, number>,
angleSlice: number,
g: d3.Selection<SVGGElement, unknown, HTMLElement, unknown>,
data: TRadarChartData,
config: IRadarChartOptions,
) => {
// the radial line function
const radarLine = d3
.lineRadial<IRadarChartDataNode>()
.radius(d => radiusScale(d.value))
.angle((d, i) => i * angleSlice);
// create a wrapper for the blobs
const blobWrapper = g.selectAll('.radar-wrapper').data(data).enter().append('g').attr('class', 'radar-wrapper');
// append the backgrounds
blobWrapper
.append('path')
.attr('class', 'radar-area')
.attr('d', (d, i) => radarLine(d))
.style('fill', (d, i) => config.color(i.toString()))
.style('fill-opacity', config.opacityArea)
.on('mouseover', function (d, i) {
// dim all blobs
const radarAreaFillOpacity = 0.1;
d3.selectAll('.radar-area').transition().duration(config.transitionDuration).style('fill-opacity', radarAreaFillOpacity);
// bring back the hovered over blob
const fillOpacity = 0.7;
d3.select(this).transition().duration(config.transitionDuration).style('fill-opacity', fillOpacity);
})
.on('mouseout', () => {
// bring back all blobs
d3.selectAll('.radar-area').transition().duration(config.transitionDuration).style('fill-opacity', config.opacityArea);
});
// create the outlines
blobWrapper
.append('path')
.attr('class', 'radar-stroke')
.attr('d', (d, i) => radarLine(d))
.style('stroke-width', `${config.strokeWidth}px`)
.style('stroke', (d, i) => config.color(i.toString()))
.style('fill', 'none')
.style('filter', 'url(#glow)');
// append the circles
const blobWrapperFillOpacity = 0.8;
blobWrapper
.selectAll('.radar-circle')
.data((d, i) => d)
.enter()
.append('circle')
.attr('class', 'radar-circle')
.attr('r', config.dotRadius)
.attr('cx', (d, i) => radiusScale(d.value) * Math.cos(angleSlice * i - Math.PI / 2))
.attr('cy', (d, i) => radiusScale(d.value) * Math.sin(angleSlice * i - Math.PI / 2))
.style('fill', (d, i, j) => config.color(j.toString()))
.style('fill-opacity', blobWrapperFillOpacity);
};
/**
* Appends the invisible tooltip circles.
* @param g the svg g element
* @param data the chart data
* @param radiusScale the chart radius scale
* @param angleSlice the chart angle slice value
* @param config the chart configuration
*/
const appendInvisibleTooltipCircles = (
g: d3.Selection<SVGGElement, unknown, HTMLElement, unknown>,
data: TRadarChartData,
radiusScale: d3.ScaleLinear<number, number>,
angleSlice: number,
config: IRadarChartOptions,
) => {
// wrapper for the invisible circles on top
const blobCircleWrapper = g.selectAll('.radar-circle-wrapper').data(data).enter().append('g').attr('class', 'radar-circle-wrapper');
// append a set of invisible circles on top for the mouseover pop-up
const blobCircleWrapperRadiusMultiplier = 1.5;
blobCircleWrapper
.selectAll<SVGElement, IRadarChartDataNode>('.radar-invisible-circle')
.data((d, i) => d)
.enter()
.append('circle')
.attr('class', 'radar-invisible-circle')
.attr('r', config.dotRadius * blobCircleWrapperRadiusMultiplier)
.attr('cx', (d, i) => radiusScale(d.value) * Math.cos(angleSlice * i - Math.PI / 2))
.attr('cy', (d, i) => radiusScale(d.value) * Math.sin(angleSlice * i - Math.PI / 2))
.style('fill', 'none')
.style('pointer-events', 'all')
.on('mouseover', function (event: MouseEvent, i) {
const modifier = 10;
const newX = parseFloat(d3.select(this).attr('cx')) - modifier;
const newY = parseFloat(d3.select(this).attr('cy')) - modifier;
const nodeData = (event.target as unknown as Record<string, IRadarChartDataNode>)['__data__'];
const tooltipText = `${nodeData.value} ${nodeData.unit}`;
g.append('text')
.attr('class', 'chart-tooltip')
.style('opacity', 0)
.attr('x', newX)
.attr('y', newY)
.text(tooltipText)
.transition()
.duration(config.transitionDuration)
.style('opacity', 1);
})
.on('mouseout', () => {
d3.selectAll('.chart-tooltip')
.transition()
.duration(config.transitionDuration / 2)
.style('opacity', 0)
.remove();
});
};
/**
* Draws the radar chart.
* @param container the chart container
* @param data the chart data
* @param options the chart options
* @returns the hart configuration
*/
export const drawRadarChart = (container: ElementRef<HTMLDivElement>, data: TRadarChartData, options?: Partial<IRadarChartOptions>) => {
const config: IRadarChartOptions = generateConfiguration<IRadarChartOptions>(defaultRadarChartConfig, options, {});
const maxValue = Math.max(config.maxValue, d3.max(data, i => d3.max(i.map(o => o.value))) ?? 0);
const axisNames = data[0].map((i, j) => i.axis);
const totalAxis = axisNames.length;
const radius = Math.min(config.width / 2 - config.margin.left / 2, config.height / 2 - config.margin.top / 2);
const angleSlice = (Math.PI * 2) / totalAxis;
const radiusScale = d3.scaleLinear([0, radius]).domain([0, maxValue]);
const { g } = createContainer(container, config);
// filter for the outside glow
const filter = g.append('defs').append('filter').attr('id', 'glow');
filter.append('feGaussianBlur').attr('stdDeviation', '2.5').attr('result', 'coloredBlur');
const feMerge = filter.append('feMerge');
feMerge.append('feMergeNode').attr('in', 'coloredBlur');
feMerge.append('feMergeNode').attr('in', 'SourceGraphic');
const axisGrid = g.append('g').attr('class', 'axis-wrapper');
drawCircularGrid(axisGrid, radius, maxValue, config);
drawAxis(axisGrid, axisNames, radiusScale, maxValue, angleSlice, config);
createLegend(g, config);
drawRadarChartBlobs(radiusScale, angleSlice, g, data, config);
appendInvisibleTooltipCircles(g, data, radiusScale, angleSlice, config);
return config;
};
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