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import { IAccessibilityProps, IHeatMapChartData, IHeatMapChartDataPoint } from '../../types/IDataPoint';
import { scaleLinear as d3ScaleLinear } from 'd3-scale';
import { classNamesFunction, getId, memoizeFunction } from '@fluentui/react/lib/Utilities';
import { FocusZoneDirection } from '@fluentui/react-focus';
import { DirectionalHint } from '@fluentui/react/lib/Callout';
import { IProcessedStyleSet } from '@fluentui/react/lib/Styling';
import * as React from 'react';
import { IHeatMapChartProps, IHeatMapChartStyleProps, IHeatMapChartStyles } from './HeatMapChart.types';
import { ILegend, Legends } from '../Legends/index';
import { convertToLocaleString } from '../../utilities/locale-util';
import { ChartTypes, getAccessibleDataObject, XAxisTypes, YAxisType, getTypeOfAxis } from '../../utilities/utilities';
import { Target } from '@fluentui/react';
import { format as d3Format } from 'd3-format';
import { timeFormat as d3TimeFormat } from 'd3-time-format';
type DataSet = {
dataSet: RectanglesGraphData;
yAxisPoints: string[];
xAxisPoints: string[];
};
type FlattenData = IHeatMapChartDataPoint & {
legend: string;
};
interface IRectRef {
data: FlattenData;
refElement: SVGGElement;
}
type RectanglesGraphData = { [key: string]: FlattenData[] };
export interface IHeatMapChartState {
/**
* contains the selected legend string
*/
selectedLegend: string;
/**
* contains the hovered legend string
*/
activeLegend: string;
/**
* determines wethere to show or hide the callout
* @default false
*/
isCalloutVisible: boolean;
/**
* y value to be shown in callout
*/
calloutYValue: string;
/**
* legend title to be shown in callout
*/
calloutLegend: string;
/**
* color of the text in the callout
*/
calloutTextColor: string;
/**
* The target that the Callout should try to position itself based on
*/
target: Target;
/**
* ratio to show in the callout
*/
ratio: [number, number] | null;
/**
* description message to show in the callout
*/
descriptionMessage: string;
/**
* id to give to callout for accesiblity purpose
*/
calloutId: string;
/**
* Accessibility data for callout
*/
callOutAccessibilityData?: IAccessibilityProps;
}
const getClassNames = classNamesFunction<IHeatMapChartStyleProps, IHeatMapChartStyles>();
export class HeatMapChartBase extends React.Component<IHeatMapChartProps, IHeatMapChartState> {
private _classNames: IProcessedStyleSet<IHeatMapChartStyles>;
private _stringXAxisDataPoints: string[];
private _stringYAxisDataPoints: string[];
private _createSet: (
data: IHeatMapChartData[],
xDate: string | undefined,
xNum: string | undefined,
yDate: string | undefined,
yNum: string | undefined,
) => DataSet;
private _dataSet: RectanglesGraphData;
// eslint-disable-next-line @typescript-eslint/no-explicit-any
private _colorScale: any;
// eslint-disable-next-line @typescript-eslint/no-explicit-any
private _xAxisScale: any;
// eslint-disable-next-line @typescript-eslint/no-explicit-any
private _yAxisScale: any;
/**
* This array contains ref for all the rectangles
* drawn inside the chard
*/
private _rectRefArray: { [key: string]: IRectRef } = {};
private _xAxisType: XAxisTypes;
private _yAxisType: YAxisType;
private _calloutAnchorPoint: FlattenData | null;
private _emptyChartId: string;
public constructor(props: IHeatMapChartProps) {
super(props);
/**
* below funciton creates a new data set from the prop
* @data and also finds all the unique x-axis datapoints
* and y-axis datapoints(which will render in the axis in graph)
* we store this in a memoized function, because we want to calulate
* this set whenever props changes.
*/
this._createSet = memoizeFunction(
(
data: IHeatMapChartData[],
xDate: string | undefined,
xNum: string | undefined,
yDate: string | undefined,
yNum: string | undefined,
): DataSet => this._createNewDataSet(data, xDate, xNum, yDate, yNum),
);
this.state = {
selectedLegend: '',
activeLegend: '',
isCalloutVisible: false,
target: null,
calloutLegend: '',
calloutTextColor: '',
calloutYValue: '',
ratio: null,
descriptionMessage: '',
calloutId: '',
};
this._emptyChartId = getId('_HeatMap_empty');
}
public render(): React.ReactNode {
const { x, y } = this._getXandY();
this._xAxisType = getTypeOfAxis(x, true) as XAxisTypes;
this._yAxisType = getTypeOfAxis(y, false) as YAxisType;
const { data, xAxisDateFormatString, xAxisNumberFormatString, yAxisDateFormatString, yAxisNumberFormatString } =
this.props;
this._colorScale = this._getColorScale();
const { dataSet, xAxisPoints, yAxisPoints } = this._createSet(
data,
xAxisDateFormatString,
xAxisNumberFormatString,
yAxisDateFormatString,
yAxisNumberFormatString,
);
this._dataSet = dataSet;
this._stringYAxisDataPoints = yAxisPoints;
this._stringXAxisDataPoints = xAxisPoints;
this._classNames = getClassNames(this.props.styles!, { theme: this.props.theme! });
const calloutProps: IModifiedCartesianChartProps['calloutProps'] = {
isBeakVisible: false,
gapSpace: 8,
...this.props.calloutProps,
isCalloutVisible: this.state.isCalloutVisible,
id: this.state.calloutId,
YValue: this.state.calloutYValue,
legend: this.state.calloutLegend,
color: this.state.calloutTextColor,
target: this.state.target,
styles: this._classNames.subComponentStyles.calloutStyles,
directionalHint: DirectionalHint.topAutoEdge,
onDismiss: this._closeCallout,
...getAccessibleDataObject(this.state.callOutAccessibilityData, 'text', false),
preventDismissOnLostFocus: true,
};
const chartHoverProps: IModifiedCartesianChartProps['chartHoverProps'] = {
...(this.state.ratio && {
ratio: this.state.ratio,
}),
descriptionMessage: this.state.descriptionMessage,
};
return !this._isChartEmpty() ? (
<CartesianChart
{...this.props}
points={data}
chartType={ChartTypes.HeatMapChart}
xAxisType={XAxisTypes.StringAxis}
yAxisType={YAxisType.StringAxis}
calloutProps={calloutProps}
chartHoverProps={chartHoverProps}
styles={this._classNames.subComponentStyles!.cartesianStyles}
datasetForXAxisDomain={this._stringXAxisDataPoints}
stringDatasetForYAxisDomain={this._stringYAxisDataPoints}
xAxisTickCount={this._stringXAxisDataPoints.length}
xAxistickSize={0}
xAxisPadding={0.02}
yAxisPadding={0.02}
svgFocusZoneProps={{
direction: FocusZoneDirection.bidirectional,
}}
legendBars={this._createLegendBars()}
onChartMouseLeave={this._handleChartMouseLeave}
/* eslint-disable react/jsx-no-bind */
// eslint-disable-next-line react/no-children-prop
children={(props: IChildProps) => {
this._xAxisScale = props.xScale;
this._yAxisScale = props.yScale;
return this._createRectangles();
}}
/>
) : (
<div
id={this._emptyChartId}
role={'alert'}
style={{ opacity: '0' }}
aria-label={'Graph has no data to display'}
/>
);
}
private _getXandY = (): { x: string | Date | number; y: string | Date | number } => {
let x: string | Date | number = '';
let y: string | Date | number = '';
this.props.data.forEach((item: IHeatMapChartData) => {
if (item.data && item.data.length > 0) {
x = item.data[0].x;
y = item.data[0].y;
return { x, y };
}
});
return { x, y };
};
private _getOpacity = (legendTitle: string): string => {
const opacity = this._legendHighlighted(legendTitle) || this._noLegendHighlighted() ? '1' : '0.1';
return opacity;
};
private _rectRefCallback = (rectElement: SVGGElement, index: number | string, dataPointObject: FlattenData): void => {
this._rectRefArray[index] = { data: dataPointObject, refElement: rectElement };
};
private _onRectFocus = (id: string, data: FlattenData): void => {
this.setState({
target: this._rectRefArray[id].refElement,
/** Show the callout if highlighted rectangle is focused and Hide it if unhighlighted rectangle is focused */
isCalloutVisible: this.state.selectedLegend === '' || this.state.selectedLegend === data.legend,
calloutYValue: `${data.rectText}`,
calloutTextColor: Number.isNaN(data.value)
? this.props.theme!.semanticColors.bodyText
: this._colorScale(data.value),
calloutLegend: data.legend,
ratio: data.ratio || null,
descriptionMessage: data.descriptionMessage || '',
calloutId: id,
callOutAccessibilityData: data.callOutAccessibilityData,
});
};
private _onRectMouseOver = (id: string, data: FlattenData, mouseEvent: React.MouseEvent<SVGGElement>): void => {
mouseEvent.persist();
if (this._calloutAnchorPoint !== data) {
this._calloutAnchorPoint = data;
this.setState({
target: this._rectRefArray[id].refElement,
/** Show the callout if highlighted rectangle is hovered and Hide it if unhighlighted rectangle is hovered */
isCalloutVisible: this.state.selectedLegend === '' || this.state.selectedLegend === data.legend,
calloutYValue: `${data.rectText}`,
calloutTextColor: Number.isNaN(data.value)
? this.props.theme!.semanticColors.bodyText
: this._colorScale(data.value),
calloutLegend: data.legend,
ratio: data.ratio || null,
descriptionMessage: data.descriptionMessage || '',
calloutId: id,
callOutAccessibilityData: data.callOutAccessibilityData,
});
}
};
private _onRectBlurOrMouseOut = (): void => {
/**/
};
private _handleChartMouseLeave = (): void => {
this._calloutAnchorPoint = null;
this.setState({
isCalloutVisible: false,
});
};
/**
* This is the function which is responsible for
* drawing the rectangle in the graph and also
* attaching dom events to that rectangles
*/
private _createRectangles = (): React.ReactNode => {
const rectangles: JSX.Element[] = [];
const yAxisDataPoints = this._stringYAxisDataPoints.slice().reverse();
/**
* yAxisDataPoint is noting but the DataPoint
* which will be rendered on the y-axis
*/
yAxisDataPoints.forEach((yAxisDataPoint: string) => {
let index = 0;
this._stringXAxisDataPoints.forEach((xAxisDataPoint: string) => {
let rectElement: JSX.Element;
const id = `x${xAxisDataPoint}y${yAxisDataPoint}`;
if (this._dataSet[yAxisDataPoint][index]?.x === xAxisDataPoint) {
/**
* dataPointObject is an object where it contains information on single
* data point such as x, y , value, rectText property of the rectangle
*/
const dataPointObject = this._dataSet[yAxisDataPoint][index];
rectElement = (
<g
key={id}
role="img"
aria-label={this._getAriaLabel(dataPointObject)}
data-is-focusable={this._legendHighlighted(dataPointObject.legend) || this._noLegendHighlighted()}
fillOpacity={this._getOpacity(dataPointObject.legend)}
transform={`translate(${this._xAxisScale(dataPointObject.x)}, ${this._yAxisScale(dataPointObject.y)})`}
ref={(gElement: SVGGElement) => {
this._rectRefCallback(gElement, id, dataPointObject);
}}
onFocus={this._onRectFocus.bind(this, id, dataPointObject)}
onBlur={this._onRectBlurOrMouseOut}
onMouseOver={this._onRectMouseOver.bind(this, id, dataPointObject)}
onMouseOut={this._onRectBlurOrMouseOut}
>
<rect
fill={this._colorScale(dataPointObject.value)}
width={this._xAxisScale.bandwidth()}
height={this._yAxisScale.bandwidth()}
onClick={dataPointObject.onClick}
/>
<text
dominantBaseline={'middle'}
textAnchor={'middle'}
className={this._classNames.text}
transform={`translate(${this._xAxisScale.bandwidth() / 2}, ${this._yAxisScale.bandwidth() / 2})`}
>
{convertToLocaleString(dataPointObject.rectText, this.props.culture)}
</text>
</g>
);
index++;
} else {
const dataPointObject: FlattenData = {
x: xAxisDataPoint,
y: yAxisDataPoint,
value: NaN,
rectText: 'No data available',
legend: '',
};
rectElement = (
<g
key={id}
role="img"
aria-label={this._getAriaLabel(dataPointObject)}
data-is-focusable={this._noLegendHighlighted()}
transform={`translate(${this._xAxisScale(dataPointObject.x)}, ${this._yAxisScale(dataPointObject.y)})`}
ref={(gElement: SVGGElement) => {
this._rectRefCallback(gElement, id, dataPointObject);
}}
onFocus={this._onRectFocus.bind(this, id, dataPointObject)}
onBlur={this._onRectBlurOrMouseOut}
onMouseOver={this._onRectMouseOver.bind(this, id, dataPointObject)}
onMouseOut={this._onRectBlurOrMouseOut}
>
<rect
fill={this.props.theme!.semanticColors.bodyBackground}
width={this._xAxisScale.bandwidth()}
height={this._yAxisScale.bandwidth()}
/>
</g>
);
}
rectangles.push(rectElement);
});
});
return rectangles;
};
/**
* when the legend is hovered we need to highlight
* all the rectangles which fall under that category
* and un-highlight the rest of them
* @param legendTitle
*/
private _onLegendHover(legendTitle: string): void {
this.setState({
activeLegend: legendTitle,
});
}
/**
* when the mouse is out from the legend , we need
* to show the graph in initial mode.
*/
private _onLegendLeave(): void {
this.setState({
activeLegend: '',
});
}
/**
* @param legendTitle
* when the legend is clicked we need to highlight
* all the rectangles which fall under that category
* and un highlight the rest of them
*/
private _onLegendClick(legendTitle: string): void {
/**
* check if the legend is already selceted,
* if yes, un-select the legend, else
* set the selected legend state to legendTitle
*/
if (this.state.selectedLegend === legendTitle) {
this.setState({
selectedLegend: '',
});
} else {
this.setState({
selectedLegend: legendTitle,
});
}
}
private _createLegendBars = (): JSX.Element => {
const { data, legendProps } = this.props;
const legends: ILegend[] = [];
data.forEach((item: IHeatMapChartData) => {
const legend: ILegend = {
title: item.legend,
color: this._colorScale(item.value),
action: () => {
this._onLegendClick(item.legend);
},
hoverAction: () => {
this._handleChartMouseLeave();
this._onLegendHover(item.legend);
},
onMouseOutAction: () => {
this._onLegendLeave();
},
};
legends.push(legend);
});
return <Legends {...legendProps} legends={legends} />;
};
private _getColorScale = () => {
const { domainValuesForColorScale, rangeValuesForColorScale } = this.props;
return d3ScaleLinear()
.domain(domainValuesForColorScale)
.range(rangeValuesForColorScale as unknown as number[]);
};
private _getXIndex = (value: string | Date | number): string => {
if (this._xAxisType === XAxisTypes.DateAxis) {
return `${(value as Date).getTime()}`;
} else if (this._xAxisType === XAxisTypes.StringAxis) {
return value as string;
} else if (this._xAxisType === XAxisTypes.NumericAxis) {
return `${value}`;
} else {
return '';
}
};
private _getYIndex = (value: string | Date | number): string => {
if (this._yAxisType === YAxisType.DateAxis) {
return `${(value as Date).getTime()}`;
} else if (this._yAxisType === YAxisType.StringAxis) {
return value as string;
} else if (this._yAxisType === YAxisType.NumericAxis) {
return `${value}`;
} else {
return '';
}
};
/**
* This will create a new data set based on the prop
* @data
* We will be using This data set to contsruct our rectangles
* in the chart, we use this data set becuase, when we loop in this
* data and build the heat map, it will support accessibility as
* specified in the figma
*/
private _createNewDataSet = (
data: IHeatMapChartData[],
xAxisDateFormatString: string | undefined,
xAxisNumberFormatString: string | undefined,
yAxisDateFormatString: string | undefined,
yAxisNumberFormatString: string | undefined,
): DataSet => {
/**
* please do not destructure any of the props here,
* instead send them as parameter to this functions so that
* this functions get called whenever the prop changes
*/
const flattenData: FlattenData[] = [];
/**
* below for each loop will store all the datapoints in the one array.
* basically it will flatten the nestesd array (data prop) into single array
* of object. where each object contains x, y, rectText , value and legend propety of single
* data point.
*/
data.forEach((item: IHeatMapChartData) => {
item.data.forEach((point: IHeatMapChartDataPoint) => {
flattenData.push({ ...point, legend: item.legend });
});
});
const yPoints: RectanglesGraphData = {};
const uniqueYPoints: { [key: string]: '1' } = {};
const uniqueXPoints: { [key: string]: '1' } = {};
flattenData.forEach((item: FlattenData) => {
const posX = this._getXIndex(item.x);
const posY = this._getYIndex(item.y);
uniqueXPoints[posX] = '1';
uniqueYPoints[posY] = '1';
/** we will check if the property(posY) is already there in object, if Yes,
* then we will append the item in the Array related to the pos, if not
* then we will simply append the item in the new Array and
* assign that array to the property (posY) in the Object
* and finally we will get the array of Objects associated to each
* property (which is nothing but y data point) and object in the
* array are noting but x data points associated to the property y
*/
if (yPoints[posY]) {
yPoints[posY] = [...yPoints[posY], item];
} else {
yPoints[posY] = [item];
}
});
/**
* we will now sort(ascending) the array's of y data point based on the x value
* sorting is important to achive the accessibility order of the
* rectangles and then format the x and y datapoints respectively
*/
Object.keys(yPoints).forEach((item: string) => {
yPoints[item]
.sort((a: IHeatMapChartDataPoint, b: IHeatMapChartDataPoint) => {
if (this._xAxisType === XAxisTypes.StringAxis) {
return (a.x as string).toLowerCase() > (b.x as string).toLowerCase() ? 1 : -1;
} else if (this._xAxisType === XAxisTypes.DateAxis) {
return (a.x as Date).getTime() - (b.x as Date).getTime();
} else if (this._xAxisType === XAxisTypes.NumericAxis) {
return +(a.x as string) > +(b.x as string) ? 1 : -1;
} else {
return a.x > b.x ? 1 : -1;
}
})
.forEach((datapoint: IHeatMapChartDataPoint) => {
if (this._xAxisType === XAxisTypes.DateAxis) {
datapoint.x = this._getStringFormattedDate(datapoint.x as string, xAxisDateFormatString);
}
if (this._xAxisType === XAxisTypes.NumericAxis) {
datapoint.x = this._getStringFormattedNumber(datapoint.x as string, xAxisNumberFormatString);
}
if (this._xAxisType === XAxisTypes.StringAxis) {
datapoint.x = this._getFormattedLabelForXAxisDataPoint(datapoint.x as string);
}
if (this._yAxisType === YAxisType.DateAxis) {
datapoint.y = this._getStringFormattedDate(datapoint.y as string, yAxisDateFormatString);
}
if (this._yAxisType === YAxisType.NumericAxis) {
datapoint.y = this._getStringFormattedNumber(datapoint.y as string, yAxisNumberFormatString);
}
if (this._yAxisType === YAxisType.StringAxis) {
datapoint.y = this._getFormattedLabelForYAxisDataPoint(datapoint.y as string);
}
});
});
/**
* if y-axis data points are of type date or number or if we have string formatter,
* then we need to change data points to their respective string
* format, becuase in the private variable this._stringYAxisDatapoints, points will be stored in
* string format. and in here `yPoint` are not so we need to change, so that
* function `this._createRectangles` should work perfetcly while looping, and if we don't change
* then `this._createRectangles` will fail while looping, causing the error
* Cannot read property 'forEach' of undefined
*/
Object.keys(yPoints).forEach((yPoint: string) => {
if (this._yAxisType === YAxisType.DateAxis) {
yPoints[this._getStringFormattedDate(yPoint, yAxisDateFormatString)] = yPoints[yPoint];
} else if (this._yAxisType === YAxisType.NumericAxis) {
yPoints[`${this._getStringFormattedNumber(yPoint, yAxisNumberFormatString)}`] = yPoints[yPoint];
} else {
yPoints[this._getFormattedLabelForYAxisDataPoint(yPoint)] = yPoints[yPoint];
}
});
/**
* assigning new data set
*/
const dataSet = yPoints;
/**
* These are the Y axis data points which will get rendered in the
* Y axis in graph
*/
const yAxisPoints = this._getYAxisDataPoints(uniqueYPoints);
/**
* These are the x axis data points which will get rendered in the
* x axis in the graph
*/
const xAxisPoints = this._getXAxisDataPoints(uniqueXPoints);
return {
dataSet,
yAxisPoints,
xAxisPoints,
};
};
/**
* This function will return the final sorted and formatted x-axis points
* which will be rendered on the x-axis
* @param points
* @returns x-axis points
*/
private _getXAxisDataPoints = (points: { [key: string]: '1' }): string[] => {
let xAxisPoints: string[] = [];
const unFormattedXAxisDataPoints = Object.keys(points).sort((a: string, b: string) => {
if (this._xAxisType === XAxisTypes.DateAxis || this._xAxisType === XAxisTypes.NumericAxis) {
return +a - +b;
} else {
return a.toLowerCase() > b.toLowerCase() ? 1 : -1;
}
});
xAxisPoints = unFormattedXAxisDataPoints.map((xPoint: string) => {
if (this._xAxisType === XAxisTypes.DateAxis) {
return this._getStringFormattedDate(xPoint, this.props.xAxisDateFormatString);
} else if (this._xAxisType === XAxisTypes.NumericAxis) {
return this._getStringFormattedNumber(xPoint, this.props.xAxisNumberFormatString);
} else {
return this._getFormattedLabelForXAxisDataPoint(xPoint);
}
});
return xAxisPoints;
};
/**
* This function will return the final sorted and formatted y-axis points
* which will be rendered on the y-axis
* @param points
* @returns yaxis points
*/
private _getYAxisDataPoints = (points: { [key: string]: '1' }): string[] => {
let yAxisPoints: string[] = [];
const unFormattedYAxisDataPoints = Object.keys(points).sort((a: string, b: string) => {
if (this._yAxisType === YAxisType.DateAxis || this._yAxisType === YAxisType.NumericAxis) {
return +a - +b;
} else {
return a.toLowerCase() > b.toLowerCase() ? 1 : -1;
}
});
yAxisPoints = unFormattedYAxisDataPoints.map((yPoint: string) => {
if (this._yAxisType === YAxisType.DateAxis) {
return this._getStringFormattedDate(yPoint, this.props.yAxisDateFormatString);
} else if (this._yAxisType === YAxisType.NumericAxis) {
return this._getStringFormattedNumber(yPoint, this.props.yAxisNumberFormatString);
} else {
return this._getFormattedLabelForYAxisDataPoint(yPoint);
}
});
return yAxisPoints;
};
private _getStringFormattedDate = (point: string, formatString?: string): string => {
const date = new Date();
date.setTime(+point);
return d3TimeFormat(formatString || '%b/%d')(date);
};
private _getStringFormattedNumber = (point: string, formatString?: string): string => {
return d3Format(formatString || '.2~s')(+point);
};
private _getFormattedLabelForXAxisDataPoint = (point: string): string => {
const { xAxisStringFormatter } = this.props;
return xAxisStringFormatter ? xAxisStringFormatter(point) : point;
};
private _getFormattedLabelForYAxisDataPoint = (point: string): string => {
const { yAxisStringFormatter } = this.props;
return yAxisStringFormatter ? yAxisStringFormatter(point) : point;
};
private _closeCallout = () => {
this.setState({
isCalloutVisible: false,
});
};
/**
* This function checks if the given legend is highlighted or not.
* A legend can be highlighted in 2 ways:
* 1. selection: if the user clicks on it
* 2. hovering: if there is no selected legend and the user hovers over it
*/
private _legendHighlighted = (legendTitle: string) => {
return (
this.state.selectedLegend === legendTitle ||
(this.state.selectedLegend === '' && this.state.activeLegend === legendTitle)
);
};
/**
* This function checks if none of the legends is selected or hovered.
*/
private _noLegendHighlighted = () => {
return this.state.selectedLegend === '' && this.state.activeLegend === '';
};
private _getAriaLabel = (point: FlattenData): string => {
const xValue = point.x;
const yValue = point.y;
const legend = point.legend;
const zValue = point.ratio ? `${point.ratio[0]}/${point.ratio[1]}` : point.rectText || point.value;
const description = point.descriptionMessage;
return (
point.callOutAccessibilityData?.ariaLabel ||
`${xValue}, ${yValue}. ${legend}, ${zValue}.` + (description ? ` ${description}.` : '')
);
};
private _isChartEmpty(): boolean {
return !(this.props.data && this.props.data.length > 0);
}
}
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