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import * as d3 from 'd3';
import type { ILineChartDataNode, ILineChartOptions, TLineChartData } from '../interfaces/line-chart.interface';
import { generateConfiguration } from './configuration.util';
/** The line chart default configuration. */
export const defaultLineChartConfig: ILineChartOptions = Object.freeze({
chartTitle: '',
width: 350,
height: 350,
margin: {
top: 70,
right: 50,
bottom: 50,
left: 50,
},
transitionDuration: 400,
dotRadius: 3.5,
xAxisTitle: '',
yAxisTitle: '',
ticks: {
x: 5,
y: 10,
},
displayAxisLabels: true,
dateFormat: 'default',
labelTextWrapWidth: 20, // the number of pixels after which a label needs to be given a new line
color: d3.scaleOrdinal(d3.schemeCategory10),
} as ILineChartOptions);
/**
* Creates a container for the line 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: ILineChartOptions) => {
const id = container.nativeElement.id ?? 'line-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(${config.margin.left},${config.margin.top / 2})`);
return { svg, g };
};
/**
* Wraps the line chart axis labels text.
* @param svgText the svg text elements
* @param width the chart axis label width
*/
const wrapSvgText = (svgText: d3.Selection<d3.BaseType, unknown, SVGGElement, unknown>, width: number) => {
svgText.each(function (this: d3.BaseType) {
const text = d3.select<d3.BaseType, 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', `${dy}em`); // axis label
let word = words.pop();
while (typeof word !== 'undefined') {
line.push(word ?? '');
tspan.text(line.join(' '));
if ((tspan.node()?.getComputedTextLength() ?? 0) > width) {
line.pop();
tspan.text(line.join(' '));
line = [word ?? ''];
tspan = text
.append('tspan')
.attr('x', 0)
.attr('y', y)
.attr('dy', `${lineNumber * lineHeight + dy}em`)
.text(word ?? '');
lineNumber += 1;
}
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: ILineChartOptions) => {
if (config.displayAxisLabels && config.xAxisTitle !== '') {
g.append('g')
.attr('transform', `translate(0, ${config.height + config.margin.bottom})`)
.append('text')
.style('font-size', '12px')
.attr('class', 'legend')
.attr('dx', '0.5em')
.attr('dy', '0em')
.text(`x - ${config.xAxisTitle}`);
}
if (config.displayAxisLabels && config.yAxisTitle !== '') {
g.append('g')
.attr('transform', `translate(0, ${config.height + config.margin.bottom})`)
.append('text')
.style('font-size', '12px')
.attr('class', 'legend')
.attr('dx', '0.5em')
.attr('dy', '1.5em')
.text(`y - ${config.yAxisTitle}`);
}
if (config.chartTitle !== '') {
g.append('g')
.attr('transform', `translate(0, 0)`)
.append('text')
.style('font-size', '12px')
.attr('class', 'legend')
.attr('dx', '1.5em')
.attr('dy', '-2em')
.text(config.chartTitle);
}
};
/**
* Creates the x axis.
* @param g the svg g element
* @param x the x axis scale
* @param config the chart configuration
*/
const createAxisX = (
g: d3.Selection<SVGGElement, unknown, HTMLElement, unknown>,
x: d3.ScaleTime<number, number>,
config: ILineChartOptions,
) => {
const xLabels = g
.append('g')
.attr('transform', `translate(0, ${config.height})`)
.call(
d3
.axisBottom(x)
.ticks(config.ticks.x)
.tickFormat(d => {
const date = new Date(d.valueOf());
const formattingOffset = 10;
const day = date.getDate();
const dd = day < formattingOffset ? `0${day}` : day;
const month = date.getMonth() + 1;
const mm = month < formattingOffset ? `0${month}` : month;
const year = date.getFullYear().toString();
const yy = year.slice(2);
const hours = date.getHours();
const hour = hours < formattingOffset ? `0${hours}` : hours;
const minutes = date.getMinutes();
const minute = minutes < formattingOffset ? `0${minutes}` : minutes;
let formattedDate = `${dd}/${mm}/${yy} ${hour}:${minute}`;
switch (config.dateFormat) {
case 'dd/mm/yyyy':
formattedDate = `${dd}/${mm}/${year}`;
break;
case 'dd/mm/yy':
formattedDate = `${dd}/${mm}/${yy}`;
break;
case 'mm/yyyy':
formattedDate = `${mm}/${year}`;
break;
case 'yyyy':
formattedDate = `${year}`;
break;
default:
break;
}
return formattedDate;
}),
)
.append('text');
g.selectAll('text').call(wrapSvgText, config.labelTextWrapWidth);
if (config.displayAxisLabels) {
xLabels.attr('transform', `translate(${config.width}, 0)`).attr('class', 'legend').attr('dx', '1.5em').attr('dy', '0.7em').text('x');
}
};
/**
* Creates the y axis.
* @param g the svg g element
* @param y the y axis scale
* @param config the chart configuration
*/
const createAxisY = (
g: d3.Selection<SVGGElement, unknown, HTMLElement, unknown>,
y: d3.ScaleLinear<number, number>,
config: ILineChartOptions,
) => {
const yLabels = g
.append('g')
.call(
d3
.axisLeft(y)
.ticks(config.ticks.y)
.tickFormat(d => `${d}`),
)
.append('text');
if (config.displayAxisLabels) {
yLabels.attr('class', 'legend').attr('dy', '-1.5em').attr('class', 'legend').text('y');
}
};
/**
* The mouse over event handler.
* @param self an svg circle element
* @param d the chart data node
* @param g the svg g element
* @param config the chart configuration
*/
const onMouseOver = (
self: SVGCircleElement,
d: ILineChartDataNode,
g: d3.Selection<SVGGElement, unknown, HTMLElement, unknown>,
config: ILineChartOptions,
) => {
const duration = 400;
d3.select(self)
.transition()
.duration(duration)
.attr('r', config.dotRadius * 2);
const tooltipShift = 4;
const tooltipDy = -10;
g.append('text')
.attr('class', 'chart-tooltip')
.style('font-size', '11px')
.attr('dx', () => (config.width - config.margin.left - config.margin.right) / tooltipShift)
.attr('dy', () => tooltipDy)
.text(() => `${d.value} (${new Date(d.timestamp).toUTCString()})`)
.transition()
.duration(config.transitionDuration)
.style('opacity', 1);
};
/**
* The mouse out event handler.
* @param self an svg circle element
* @param config the chart configuration
*/
const onMouseOut = (self: SVGCircleElement, config: ILineChartOptions) => {
const duration = 400;
d3.select(self).attr('class', 'dot');
d3.select(self).transition().duration(duration).attr('r', config.dotRadius);
d3.selectAll('.chart-tooltip')
.transition()
.duration(config.transitionDuration / 2)
.style('opacity', 0)
.remove();
};
/**
* Draws the chart lines, dots, and sets the mouse pointer events.
* @param g the svg g element
* @param x the x axis scale
* @param y the y axis scale
* @param config the chart configuration
* @param data the chart data
* @param datasetLabels the set of labels for the chart's dataset
*/
const drawLinesDotsAndSetPointerEvents = (
g: d3.Selection<SVGGElement, unknown, HTMLElement, unknown>,
x: d3.ScaleTime<number, number>,
y: d3.ScaleLinear<number, number>,
config: ILineChartOptions,
data: TLineChartData[],
datasetLabels: string[],
) => {
const line = d3
.line<ILineChartDataNode>()
.x(d => x(d.timestamp))
.y(d => y(d.value))
.curve(d3.curveMonotoneX);
const flatData = data.flat();
for (let c = 0, maxC = data.length; c < maxC; c += 1) {
const chunk = data[c];
g.append('path')
.attr('id', `line-${c}`)
.style('fill', 'none')
.style('stroke', config.color(c.toString()))
.style('stroke-width', '2px')
.attr('d', line(chunk));
const datasetLabelText = datasetLabels[c];
const datasetLabel = g.append('g').attr('transform', `translate(0, ${config.height + config.margin.bottom})`);
const markerShiftY = { multiplier: 12, modifier: 4 };
datasetLabel
.append('line')
.attr('id', `legend-line-${c}`)
.style('fill', 'none')
.style('stroke', config.color(c.toString()))
.style('stroke-width', '2px')
.attr('x1', '6.75em')
.attr('y1', c * markerShiftY.multiplier - markerShiftY.modifier)
.attr('x2', '7.25em')
.attr('y2', c * markerShiftY.multiplier - markerShiftY.modifier);
datasetLabel
.append('text')
.style('font-size', '12px')
.attr('class', 'legend')
.attr('dx', '10em')
.attr('dy', `${c}em`)
.text(datasetLabelText);
}
g.selectAll('.dot')
.data(flatData)
.enter()
.append('circle')
.attr('class', 'dot')
.style('pointer-events', 'all')
.style('fill', (d, i) => config.color(i.toString()))
.on('mouseover', function (this, event, d) {
return onMouseOver(this, d, g, config);
})
.on('mouseout', function (this) {
return onMouseOut(this, config);
})
.attr('cx', function (this, d) {
return x(d.timestamp);
})
.attr('cy', function (this, d) {
return y(d.value);
})
.attr('r', 0)
.transition()
.ease(d3.easeLinear)
.duration(config.transitionDuration)
.delay((d, i) => {
const multiplier = 50;
return i * multiplier;
})
.attr('r', config.dotRadius);
};
/**
* Draws the line chart.
* @param container the chart container
* @param data the chart data
* @param options the chart options
* @returns the chart configuration
*/
export const drawLineChart = (
container: ElementRef<HTMLDivElement>,
data: TLineChartData[],
datasetLabels: string[],
options?: Partial<ILineChartOptions>,
) => {
const config: ILineChartOptions = generateConfiguration<ILineChartOptions>(defaultLineChartConfig, options, {});
const { g } = createContainer(container, config);
const range = data.reduce(
(accumulator: { minTime: number; maxTime: number; maxValue: number }, arr) => {
const timestamps = arr.map(item => item.timestamp);
const minItem = Math.min(...timestamps);
const maxItem = Math.max(...timestamps);
const minTime = Math.min(minItem, accumulator.minTime);
const maxTime = Math.max(maxItem, accumulator.maxTime);
const values = arr.map(item => item.value);
const maxItemValue = Math.max(...values);
const maxValue = Math.max(maxItemValue, accumulator.maxValue);
return { minTime, maxTime, maxValue };
},
{ minTime: Number(Infinity), maxTime: -Infinity, maxValue: -Infinity },
);
const x = d3.scaleTime([0, config.width]).domain([range.minTime, range.maxTime]);
const y = d3.scaleLinear([config.height, 0]).domain([0, range.maxValue ?? 1]);
createAxisX(g, x, config);
createAxisY(g, y, config);
createLegend(g, config);
drawLinesDotsAndSetPointerEvents(g, x, y, config, data, datasetLabels);
return config;
};
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