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import {
sortBy,
sum,
guid,
getRelativeMouse,
pointsToPath,
minBy,
flatten,
last,
exposeInstanceOnWindow,
round,
excludeUndefined,
isNumber,
sortedUniqBy,
} from "../../clientUtils/Util"
import { computed, action, observable } from "mobx"
import { observer } from "mobx-react"
import { select } from "d3-selection"
import { easeLinear } from "d3-ease"
import { Bounds, DEFAULT_BOUNDS } from "../../clientUtils/Bounds"
import { DualAxisComponent } from "../axis/AxisViews"
import { DualAxis, HorizontalAxis, VerticalAxis } from "../axis/Axis"
import { PointVector } from "../../clientUtils/PointVector"
import {
LineLegend,
LineLabelSeries,
LineLegendManager,
} from "../lineLegend/LineLegend"
import { ComparisonLine } from "../scatterCharts/ComparisonLine"
import { Tooltip } from "../tooltip/Tooltip"
import { NoDataModal } from "../noDataModal/NoDataModal"
import { extent } from "d3-array"
import {
BASE_FONT_SIZE,
SeriesName,
ScaleType,
SeriesStrategy,
} from "../core/GrapherConstants"
import { ColorSchemes } from "../color/ColorSchemes"
import { AxisConfig, FontSizeManager } from "../axis/AxisConfig"
import { ChartInterface } from "../chart/ChartInterface"
import {
LinesProps,
LineChartSeries,
LineChartManager,
LinePoint,
PlacedLineChartSeries,
PlacedPoint,
} from "./LineChartConstants"
import { OwidTable } from "../../coreTable/OwidTable"
import {
autoDetectSeriesStrategy,
autoDetectYColumnSlugs,
getDefaultFailMessage,
getSeriesKey,
makeClipPath,
makeSelectionArray,
} from "../chart/ChartUtils"
import { ColorScheme } from "../color/ColorScheme"
import { SelectionArray } from "../selection/SelectionArray"
import { CoreColumn } from "../../coreTable/CoreTableColumns"
import {
CoreValueType,
PrimitiveType,
} from "../../coreTable/CoreTableConstants"
import { CategoricalBin, ColorScaleBin } from "../color/ColorScaleBin"
import { ColorScale, ColorScaleManager } from "../color/ColorScale"
import {
ColorScaleConfig,
ColorScaleConfigInterface,
} from "../color/ColorScaleConfig"
import { isNotErrorValue } from "../../coreTable/ErrorValues"
import { ColorSchemeName } from "../color/ColorConstants"
import { MultiColorPolyline } from "../scatterCharts/MultiColorPolyline"
import { CategoricalColorAssigner } from "../color/CategoricalColorAssigner"
import { EntityName } from "../../coreTable/OwidTableConstants"
import { Color, HorizontalAlign } from "../../clientUtils/owidTypes"
import {
darkenColorForHighContrastText,
darkenColorForLine,
} from "../color/ColorUtils"
import {
HorizontalColorLegendManager,
HorizontalNumericColorLegend,
} from "../horizontalColorLegend/HorizontalColorLegends"
// background
const BACKGROUND_COLOR = "#fff"
// line color
const BLUR_LINE_COLOR = "#eee"
const DEFAULT_LINE_COLOR = "#000"
// stroke width
const DEFAULT_STROKE_WIDTH = 1.5
const VARIABLE_COLOR_STROKE_WIDTH = 2.5
// marker radius
const DEFAULT_MARKER_RADIUS = 1.8
const VARIABLE_COLOR_MARKER_RADIUS = 2.2
// line outline
const DEFAULT_LINE_OUTLINE_WIDTH = 0.5
const VARIABLE_COLOR_LINE_OUTLINE_WIDTH = 1.0
// legend
const LEGEND_PADDING = 25
@observer
class Lines extends React.Component<LinesProps> {
base: React.RefObject<SVGGElement> = React.createRef()
@computed private get allValues(): LinePoint[] {
return flatten(this.props.placedSeries.map((series) => series.points))
}
@action.bound private onCursorMove(ev: MouseEvent | TouchEvent): void {
const { dualAxis } = this.props
const { horizontalAxis } = dualAxis
if (!this.base.current) return
const mouse = getRelativeMouse(this.base.current, ev)
let hoverX
if (dualAxis.innerBounds.contains(mouse)) {
const closestValue = minBy(this.allValues, (point) =>
Math.abs(horizontalAxis.place(point.x) - mouse.x)
)
hoverX = closestValue?.x
}
this.props.onHover(hoverX)
}
@action.bound private onCursorLeave(): void {
this.props.onHover(undefined)
}
@computed get bounds(): Bounds {
const { horizontalAxis, verticalAxis } = this.props.dualAxis
return Bounds.fromCorners(
new PointVector(horizontalAxis.range[0], verticalAxis.range[0]),
new PointVector(horizontalAxis.range[1], verticalAxis.range[1])
)
}
@computed private get focusedLines(): PlacedLineChartSeries[] {
const { focusedSeriesNames } = this.props
// If nothing is focused, everything is
if (!focusedSeriesNames.length) return this.props.placedSeries
return this.props.placedSeries.filter((series) =>
focusedSeriesNames.includes(series.seriesName)
)
}
@computed private get backgroundLines(): PlacedLineChartSeries[] {
const { focusedSeriesNames } = this.props
return this.props.placedSeries.filter(
(series) => !focusedSeriesNames.includes(series.seriesName)
)
}
// Don't display point markers if there are very many of them for performance reasons
// Note that we're using circle elements instead of marker-mid because marker performance in Safari 10 is very poor for some reason
@computed private get hasMarkers(): boolean {
if (this.props.hidePoints) return false
return (
sum(this.focusedLines.map((series) => series.placedPoints.length)) <
500
)
}
@computed private get markerRadius(): number {
return this.props.markerRadius ?? DEFAULT_MARKER_RADIUS
}
@computed private get strokeWidth(): number {
return this.props.lineStrokeWidth ?? DEFAULT_STROKE_WIDTH
}
@computed private get lineOutlineWidth(): number {
return this.props.lineOutlineWidth ?? DEFAULT_LINE_OUTLINE_WIDTH
}
private renderFocusGroups(): JSX.Element[] {
return this.focusedLines.map((series, index) => {
// If the series only contains one point, then we will always want to show a marker/circle
// because we can't draw a line.
const showMarkers =
(this.hasMarkers || series.placedPoints.length === 1) &&
!series.isProjection
const strokeDasharray = series.isProjection ? "2,3" : undefined
return (
<g key={index}>
{/*
Create a white outline around the lines so they're
easier to follow when they overlap.
*/}
<path
fill="none"
strokeLinecap="butt"
strokeLinejoin="round"
stroke={BACKGROUND_COLOR}
strokeWidth={
this.strokeWidth + this.lineOutlineWidth * 2
}
strokeDasharray={strokeDasharray}
d={pointsToPath(
series.placedPoints.map((value) => [
value.x,
value.y,
]) as [number, number][]
)}
/>
<MultiColorPolyline
points={series.placedPoints}
strokeLinejoin="round"
strokeWidth={this.strokeWidth}
strokeDasharray={strokeDasharray}
/>
{showMarkers && (
<g>
{series.placedPoints.map((value, index) => (
<circle
key={index}
cx={value.x}
cy={value.y}
r={this.markerRadius}
fill={value.color}
/>
))}
</g>
)}
</g>
)
})
}
private renderBackgroundGroups(): JSX.Element[] {
return this.backgroundLines.map((series, index) => (
<g key={index}>
<path
key={getSeriesKey(series, "line")}
strokeLinecap="round"
strokeLinejoin="round"
stroke="#ddd"
d={pointsToPath(
series.placedPoints.map((value) => [
value.x,
value.y,
]) as [number, number][]
)}
fill="none"
strokeWidth={1}
/>
</g>
))
}
private container?: SVGElement
componentDidMount(): void {
const base = this.base.current as SVGGElement
const container = base.closest("svg") as SVGElement
container.addEventListener("mousemove", this.onCursorMove)
container.addEventListener("mouseleave", this.onCursorLeave)
container.addEventListener("touchstart", this.onCursorMove)
container.addEventListener("touchmove", this.onCursorMove)
container.addEventListener("touchend", this.onCursorLeave)
container.addEventListener("touchcancel", this.onCursorLeave)
this.container = container
}
componentWillUnmount(): void {
const { container } = this
if (!container) return
container.removeEventListener("mousemove", this.onCursorMove)
container.removeEventListener("mouseleave", this.onCursorLeave)
container.removeEventListener("touchstart", this.onCursorMove)
container.removeEventListener("touchmove", this.onCursorMove)
container.removeEventListener("touchend", this.onCursorLeave)
container.removeEventListener("touchcancel", this.onCursorLeave)
}
render(): JSX.Element {
const { bounds } = this
return (
<g ref={this.base} className="Lines">
<rect
x={Math.round(bounds.x)}
y={Math.round(bounds.y)}
width={Math.round(bounds.width)}
height={Math.round(bounds.height)}
fill="rgba(255,255,255,0)"
opacity={0}
/>
{this.renderBackgroundGroups()}
{this.renderFocusGroups()}
</g>
)
}
}
@observer
export class LineChart
extends React.Component<{
bounds?: Bounds
manager: LineChartManager
}>
implements
ChartInterface,
LineLegendManager,
FontSizeManager,
ColorScaleManager,
HorizontalColorLegendManager
{
base: React.RefObject<SVGGElement> = React.createRef()
transformTable(table: OwidTable): OwidTable {
table = table.filterByEntityNames(
this.selectionArray.selectedEntityNames
)
// TODO: remove this filter once we don't have mixed type columns in datasets
// Currently we set skipParsing=true on these columns to be backwards-compatible
table = table.replaceNonNumericCellsWithErrorValues(this.yColumnSlugs)
if (this.isLogScale)
table = table.replaceNonPositiveCellsForLogScale(this.yColumnSlugs)
if (this.colorColumnSlug) {
table = table
// TODO: remove this filter once we don't have mixed type columns in datasets
// Currently we set skipParsing=true on these columns to be backwards-compatible
.replaceNonNumericCellsWithErrorValues([this.colorColumnSlug])
.interpolateColumnWithTolerance(this.colorColumnSlug)
}
return table
}
@computed get inputTable(): OwidTable {
return this.manager.table
}
@computed private get transformedTableFromGrapher(): OwidTable {
return (
this.manager.transformedTable ??
this.transformTable(this.inputTable)
)
}
@computed get transformedTable(): OwidTable {
let table = this.transformedTableFromGrapher
// The % growth transform cannot be applied in transformTable() because it will filter out
// any rows before startHandleTimeBound and change the timeline bounds.
const { isRelativeMode, startHandleTimeBound } = this.manager
if (isRelativeMode && startHandleTimeBound !== undefined) {
table = table.toTotalGrowthForEachColumnComparedToStartTime(
startHandleTimeBound,
this.manager.yColumnSlugs ?? []
)
}
return table
}
// todo: rename mouseHoverX -> hoverX and hoverX -> activeX
@observable mouseHoverX?: number = undefined
@action.bound onHover(hoverX: number | undefined): void {
this.mouseHoverX = hoverX
}
@computed get hoverX(): number | undefined {
return this.mouseHoverX ?? this.props.manager.annotation?.year
}
@computed private get manager(): LineChartManager {
return this.props.manager
}
@computed get bounds(): Bounds {
return this.props.bounds ?? DEFAULT_BOUNDS
}
@computed private get boundsWithoutColorLegend(): Bounds {
return this.bounds.padTop(
this.hasColorLegend ? this.legendHeight + LEGEND_PADDING : 0
)
}
@computed get maxLineLegendWidth(): number {
return this.bounds.width / 3
}
@computed private get lineStrokeWidth(): number {
return this.manager.lineStrokeWidth ?? this.hasColorScale
? VARIABLE_COLOR_STROKE_WIDTH
: DEFAULT_STROKE_WIDTH
}
@computed private get lineOutlineWidth(): number {
return this.hasColorScale
? VARIABLE_COLOR_LINE_OUTLINE_WIDTH
: DEFAULT_LINE_OUTLINE_WIDTH
}
@computed private get markerRadius(): number {
return this.hasColorScale
? VARIABLE_COLOR_MARKER_RADIUS
: DEFAULT_MARKER_RADIUS
}
@computed get selectionArray(): SelectionArray {
return makeSelectionArray(this.manager)
}
seriesIsBlurred(series: LineChartSeries): boolean {
return (
this.isFocusMode &&
!this.focusedSeriesNames.includes(series.seriesName)
)
}
@computed private get tooltip(): JSX.Element | undefined {
const { hoverX, dualAxis, inputTable, formatColumn, hasColorScale } =
this
if (hoverX === undefined) return undefined
const sortedData = sortBy(this.series, (series) => {
const value = series.points.find((point) => point.x === hoverX)
return value !== undefined ? -value.y : Infinity
})
const formatted = inputTable.timeColumnFormatFunction(hoverX)
return (
<Tooltip
tooltipManager={this.manager}
x={dualAxis.horizontalAxis.place(hoverX)}
y={
dualAxis.verticalAxis.rangeMin +
dualAxis.verticalAxis.rangeSize / 2
}
style={{ padding: "0.3em" }}
offsetX={5}
>
<table
style={{
fontSize: "0.9em",
lineHeight: "1.4em",
whiteSpace: "normal",
}}
>
<thead>
<tr>
<td colSpan={3}>
<strong>{formatted}</strong>
</td>
{hasColorScale && (
<td
style={{
paddingLeft: "0.5em",
fontSize: "0.9em",
color: "#999",
whiteSpace: "normal",
maxWidth: "5em",
textAlign: "right",
lineHeight: "1.1em",
}}
>
{this.colorScale.legendDescription}
</td>
)}
</tr>
</thead>
<tbody>
{sortedData.map((series) => {
const value = series.points.find(
(point) => point.x === hoverX
)
const annotation = this.getAnnotationsForSeries(
series.seriesName
)
// It sometimes happens that data is missing for some years for a particular
// entity. If the user hovers over these years, we want to show a "No data"
// notice. However, we only want to show this notice when we are in the middle
// of a time series – when data points exist before and after the current year.
// Otherwise we want to entirely exclude the entity from the tooltip.
if (!value) {
const [startX, endX] = extent(
series.points,
(point) => point.x
)
if (
startX === undefined ||
endX === undefined ||
startX > hoverX ||
endX < hoverX
)
return undefined
}
const isBlur =
this.seriesIsBlurred(series) ||
value === undefined
const circleColor = isBlur
? BLUR_LINE_COLOR
: this.hasColorScale
? this.getColorScaleColor(value.colorValue)
: series.color
const textColor = isBlur
? "#ddd"
: darkenColorForHighContrastText(circleColor)
const annotationColor = isBlur ? "#ddd" : "#999"
return (
<tr
key={getSeriesKey(series)}
style={{ color: textColor }}
>
<td>
<div
style={{
width: "10px",
height: "10px",
borderRadius: "5px",
backgroundColor: circleColor,
display: "inline-block",
marginRight: "2px",
}}
/>
</td>
<td
style={{
paddingRight: "0.8em",
fontWeight: 700,
}}
>
{series.seriesName}
{annotation && (
<span
className="tooltipAnnotation"
style={{
color: annotationColor,
fontSize: "90%",
}}
>
{" "}
{annotation}
</span>
)}
</td>
<td
style={{
textAlign: "right",
whiteSpace: "nowrap",
fontWeight: 700,
}}
>
{value === undefined
? "No data"
: formatColumn.formatValueShort(
value.y,
{ noTrailingZeroes: false }
)}
</td>
{hasColorScale && (
<td
style={{
textAlign: "right",
whiteSpace: "nowrap",
fontSize: "0.95em",
paddingLeft: "0.5em",
}}
>
{value?.colorValue !== undefined
? this.colorColumn.formatValueShort(
value.colorValue,
{
noTrailingZeroes:
false,
}
)
: undefined}
</td>
)}
</tr>
)
})}
</tbody>
</table>
</Tooltip>
)
}
defaultRightPadding = 1
@observable hoveredSeriesName?: SeriesName
@action.bound onLineLegendClick(): void {
if (this.manager.startSelectingWhenLineClicked)
this.manager.isSelectingData = true
}
@action.bound onLineLegendMouseOver(seriesName: SeriesName): void {
this.hoveredSeriesName = seriesName
}
@action.bound onLineLegendMouseLeave(): void {
this.hoveredSeriesName = undefined
}
@computed get focusedSeriesNames(): string[] {
const { externalLegendFocusBin } = this.manager
const focusedSeriesNames = excludeUndefined([
this.props.manager.annotation?.entityName,
this.hoveredSeriesName,
])
if (externalLegendFocusBin) {
focusedSeriesNames.push(
...this.series
.map((s) => s.seriesName)
.filter((name) => externalLegendFocusBin.contains(name))
)
}
return focusedSeriesNames
}
@computed get isFocusMode(): boolean {
return this.focusedSeriesNames.length > 0
}
animSelection?: d3.Selection<
d3.BaseType,
unknown,
SVGGElement | null,
unknown
>
componentDidMount(): void {
if (!this.manager.isExportingtoSvgOrPng) this.runFancyIntroAnimation()
exposeInstanceOnWindow(this)
}
componentWillUnmount(): void {
if (this.animSelection) this.animSelection.interrupt()
}
@computed get renderUid(): number {
return guid()
}
@computed get fontSize(): number {
return this.manager.baseFontSize ?? BASE_FONT_SIZE
}
@computed get fontWeight(): number {
return this.hasColorScale ? 700 : 400
}
@computed get lineLegendX(): number {
return this.bounds.right - (this.lineLegendDimensions?.width || 0)
}
@computed get clipPathBounds(): Bounds {
const { dualAxis, boundsWithoutColorLegend } = this
return boundsWithoutColorLegend
.set({ x: dualAxis.innerBounds.x })
.expand(10)
}
@computed get clipPath(): { id: string; element: JSX.Element } {
return makeClipPath(this.renderUid, this.clipPathBounds)
}
private runFancyIntroAnimation(): void {
this.animSelection = select(this.base.current)
.selectAll("clipPath > rect")
.attr("width", 0)
this.animSelection
.transition()
.duration(800)
.ease(easeLinear)
.attr("width", this.clipPathBounds.width)
.on("end", () => this.forceUpdate()) // Important in case bounds changes during transition
}
@computed private get lineLegendDimensions(): LineLegend | undefined {
return this.manager.hideLegend
? undefined
: new LineLegend({ manager: this })
}
render(): JSX.Element {
if (this.failMessage)
return (
<NoDataModal
manager={this.manager}
bounds={this.bounds}
message={this.failMessage}
/>
)
const { manager, tooltip, dualAxis, hoverX, clipPath } = this
const { horizontalAxis, verticalAxis } = dualAxis
const comparisonLines = manager.comparisonLines || []
const showLegend = !manager.hideLegend
// The tiny bit of extra space in the clippath is to ensure circles centered on the very edge are still fully visible
return (
<g ref={this.base} className="LineChart">
{clipPath.element}
{this.hasColorLegend && (
<HorizontalNumericColorLegend manager={this} />
)}
<DualAxisComponent dualAxis={dualAxis} showTickMarks={true} />
<g clipPath={clipPath.id}>
{comparisonLines.map((line, index) => (
<ComparisonLine
key={index}
dualAxis={dualAxis}
comparisonLine={line}
/>
))}
{showLegend && <LineLegend manager={this} />}
<Lines
dualAxis={dualAxis}
placedSeries={this.placedSeries}
hidePoints={manager.hidePoints}
onHover={this.onHover}
focusedSeriesNames={this.focusedSeriesNames}
lineStrokeWidth={this.lineStrokeWidth}
lineOutlineWidth={this.lineOutlineWidth}
markerRadius={this.markerRadius}
/>
</g>
{hoverX !== undefined && (
<g className="hoverIndicator">
{this.series.map((series) => {
const value = series.points.find(
(point) => point.x === hoverX
)
if (!value || this.seriesIsBlurred(series))
return null
return (
<circle
key={getSeriesKey(series)}
cx={horizontalAxis.place(value.x)}
cy={verticalAxis.place(value.y)}
r={4}
fill={
this.hasColorScale
? this.getColorScaleColor(
value.colorValue
)
: series.color
}
/>
)
})}
<line
x1={horizontalAxis.place(hoverX)}
y1={verticalAxis.range[0]}
x2={horizontalAxis.place(hoverX)}
y2={verticalAxis.range[1]}
stroke="rgba(180,180,180,.4)"
/>
</g>
)}
{tooltip}
</g>
)
}
@computed get failMessage(): string {
const message = getDefaultFailMessage(this.manager)
if (message) return message
if (!this.series.length) return "No matching data"
return ""
}
@computed private get yColumns(): CoreColumn[] {
return this.yColumnSlugs.map((slug) => this.transformedTable.get(slug))
}
@computed protected get yColumnSlugs(): string[] {
return autoDetectYColumnSlugs(this.manager)
}
@computed private get colorColumnSlug(): string | undefined {
return this.manager.colorColumnSlug
}
@computed private get colorColumn(): CoreColumn {
return this.transformedTable.get(this.colorColumnSlug)
}
@computed private get formatColumn(): CoreColumn {
return this.yColumns[0]
}
@computed private get hasColorScale(): boolean {
return !this.colorColumn.isMissing
}
// Color scale props
@computed get colorScaleColumn(): CoreColumn {
return (
// For faceted charts, we have to get the values of inputTable before it's filtered by
// the faceting logic.
this.manager.colorScaleColumnOverride ??
// We need to use inputTable in order to get consistent coloring for a variable across
// charts, e.g. each continent being assigned to the same color.
// inputTable is unfiltered, so it contains every value that exists in the variable.
this.inputTable.get(this.colorColumnSlug)
)
}
@computed get colorScaleConfig(): ColorScaleConfigInterface | undefined {
return (
ColorScaleConfig.fromDSL(this.colorColumn.def) ??
this.manager.colorScale
)
}
@computed get hasNoDataBin(): boolean {
if (!this.hasColorScale) return false
return this.colorColumn.valuesIncludingErrorValues.some(
(value) => !isNotErrorValue(value)
)
}
defaultBaseColorScheme = ColorSchemeName.YlGnBu
defaultNoDataColor = "#959595"
transformColor = darkenColorForLine
colorScale = new ColorScale(this)
private getColorScaleColor(value: CoreValueType | undefined): Color {
return this.colorScale.getColor(value) ?? DEFAULT_LINE_COLOR
}
// End of color scale props
// Color legend props
@computed private get hasColorLegend(): boolean {
return this.hasColorScale && !this.manager.hideLegend
}
@computed get legendX(): number {
return this.bounds.x
}
@computed get legendMaxWidth(): number {
return this.bounds.width
}
@computed get legendAlign(): HorizontalAlign {
return HorizontalAlign.center
}
// TODO just pass colorScale to legend and let it figure it out?
@computed get numericLegendData(): ColorScaleBin[] {
// Move CategoricalBins to end
return sortBy(
this.colorScale.legendBins,
(bin) => bin instanceof CategoricalBin
)
}
// TODO just pass colorScale to legend and let it figure it out?
@computed get equalSizeBins(): boolean | undefined {
return this.colorScale.config.equalSizeBins
}
numericBinSize = 6
numericBinStroke = BACKGROUND_COLOR
numericBinStrokeWidth = 1
legendTextColor = "#555"
legendTickSize = 1
@computed get numericLegend(): HorizontalNumericColorLegend | undefined {
return this.hasColorScale && !this.manager.hideLegend
? new HorizontalNumericColorLegend({ manager: this })
: undefined
}
@computed get numericLegendY(): number {
return this.bounds.top
}
@computed get legendTitle(): string | undefined {
return this.hasColorScale
? this.colorScale.legendDescription
: undefined
}
@computed get legendHeight(): number {
return this.numericLegend?.height ?? 0
}
// End of color legend props
// todo: for now just works with 1 y column
@computed private get annotationsMap(): Map<
PrimitiveType,
Set<PrimitiveType>
> {
return this.inputTable
.getAnnotationColumnForColumn(this.yColumnSlugs[0])
?.getUniqueValuesGroupedBy(this.inputTable.entityNameSlug)
}
getAnnotationsForSeries(seriesName: SeriesName): string | undefined {
const annotationsMap = this.annotationsMap
const annos = annotationsMap?.get(seriesName)
return annos
? Array.from(annos.values())
.filter((anno) => anno)
.join(" & ")
: undefined
}
@computed private get colorScheme(): ColorScheme {
return (
(this.manager.baseColorScheme
? ColorSchemes[this.manager.baseColorScheme]
: null) ?? ColorSchemes["owid-distinct"]
)
}
@computed get seriesStrategy(): SeriesStrategy {
return autoDetectSeriesStrategy(this.manager, true)
}
@computed get isLogScale(): boolean {
return this.yAxisConfig.scaleType === ScaleType.log
}
@computed private get categoricalColorAssigner(): CategoricalColorAssigner {
return new CategoricalColorAssigner({
colorScheme: this.colorScheme,
invertColorScheme: this.manager.invertColorScheme,
colorMap:
this.seriesStrategy === SeriesStrategy.entity
? this.inputTable.entityNameColorIndex
: this.inputTable.columnDisplayNameToColorMap,
autoColorMapCache: this.manager.seriesColorMap,
})
}
private getSeriesName(
entityName: EntityName,
columnName: string,
entityCount: number
): SeriesName {
if (this.seriesStrategy === SeriesStrategy.entity) {
return entityName
}
if (entityCount > 1 || this.manager.canSelectMultipleEntities) {
return `${entityName} - ${columnName}`
} else {
return columnName
}
}
private getColorKey(
entityName: EntityName,
columnName: string,
entityCount: number
): SeriesName {
if (this.seriesStrategy === SeriesStrategy.entity) {
return entityName
}
// If only one entity is plotted, we want to use the column colors.
// Unlike in `getSeriesName`, we don't care whether the user can select
// multiple entities, only whether more than one is plotted.
if (entityCount > 1) {
return `${entityName} - ${columnName}`
} else {
return columnName
}
}
// cache value for performance
@computed private get rowIndicesByEntityName(): Map<string, number[]> {
return this.transformedTable.rowIndex([
this.transformedTable.entityNameSlug,
])
}
private constructSingleSeries(
entityName: string,
col: CoreColumn
): LineChartSeries {
const { hasColorScale, transformedTable, colorColumn } = this
// Construct the points
const timeValues = col.originalTimeColumn.valuesIncludingErrorValues
const values = col.valuesIncludingErrorValues
const colorValues = colorColumn.valuesIncludingErrorValues
// If Y and Color are the same column, we need to get rid of any duplicate rows.
// Duplicates occur because Y doesn't have tolerance applied, but Color does.
const rowIndexes = sortedUniqBy(
this.rowIndicesByEntityName
.get(entityName)!
.filter((index) => isNumber(values[index])),
(index) => timeValues[index]
)
const points = rowIndexes.map((index) => {
const point: LinePoint = {
x: timeValues[index] as number,
y: values[index] as number,
}
if (hasColorScale) {
const colorValue = colorValues[index]
point.colorValue = isNotErrorValue(colorValue)
? colorValue
: undefined
}
return point
})
// Construct series properties
const totalEntityCount = transformedTable.availableEntityNames.length
const seriesName = this.getSeriesName(
entityName,
col.displayName,
totalEntityCount
)
let seriesColor: Color
if (hasColorScale) {
const colorValue = last(points)?.colorValue
seriesColor = this.getColorScaleColor(colorValue)
} else {
seriesColor = this.categoricalColorAssigner.assign(
this.getColorKey(entityName, col.displayName, totalEntityCount)
)
}
return {
points,
seriesName,
isProjection: col.isProjection,
color: seriesColor,
}
}
@computed get series(): readonly LineChartSeries[] {
return flatten(
this.yColumns.map((col) =>
col.uniqEntityNames.map(
(entityName): LineChartSeries =>
this.constructSingleSeries(entityName, col)
)
)
)
}
// TODO: remove, seems unused
@computed get allPoints(): LinePoint[] {
return flatten(this.series.map((series) => series.points))
}
@computed get placedSeries(): PlacedLineChartSeries[] {
const { dualAxis } = this
const { horizontalAxis, verticalAxis } = dualAxis
return this.series
.slice()
.reverse()
.map((series) => {
return {
...series,
placedPoints: series.points.map(
(point): PlacedPoint => ({
x: round(horizontalAxis.place(point.x), 1),
y: round(verticalAxis.place(point.y), 1),
color: this.hasColorScale
? this.getColorScaleColor(point.colorValue)
: series.color,
})
),
}
})
}
// Order of the legend items on a line chart should visually correspond
// to the order of the lines as the approach the legend
@computed get labelSeries(): LineLabelSeries[] {
// If there are any projections, ignore non-projection legends
// Bit of a hack
let seriesToShow = this.series
if (seriesToShow.some((series) => !!series.isProjection))
seriesToShow = seriesToShow.filter((series) => series.isProjection)
return seriesToShow.map((series) => {
const { seriesName, color } = series
const lastValue = last(series.points)!.y
return {
color,
seriesName,
// E.g. https://ourworldindata.org/grapher/size-poverty-gap-world
label: this.manager.hideLegend ? "" : `${seriesName}`,
annotation: this.getAnnotationsForSeries(seriesName),
yValue: lastValue,
}
})
}
@computed private get xAxisConfig(): AxisConfig {
return new AxisConfig(this.manager.xAxisConfig, this)
}
@computed private get horizontalAxisPart(): HorizontalAxis {
const axis = this.xAxisConfig.toHorizontalAxis()
axis.updateDomainPreservingUserSettings(
this.transformedTable.timeDomainFor(this.yColumnSlugs)
)
axis.scaleType = ScaleType.linear
axis.formatColumn = this.inputTable.timeColumn
axis.hideFractionalTicks = true
axis.hideGridlines = true
return axis
}
@computed private get yAxisConfig(): AxisConfig {
// TODO: enable nice axis ticks for linear scales
return new AxisConfig(this.manager.yAxisConfig, this)
}
@computed private get verticalAxisPart(): VerticalAxis {
const axisConfig = this.yAxisConfig
const yDomain = this.transformedTable.domainFor(this.yColumnSlugs)
const domain = axisConfig.domain
const axis = axisConfig.toVerticalAxis()
axis.updateDomainPreservingUserSettings([
Math.min(domain[0], yDomain[0]),
Math.max(domain[1], yDomain[1]),
])
axis.hideFractionalTicks = this.yColumns.every(
(yColumn) => yColumn.isAllIntegers
) // all y axis points are integral, don't show fractional ticks in that case
axis.label = ""
axis.formatColumn = this.formatColumn
return axis
}
@computed private get dualAxis(): DualAxis {
return new DualAxis({
bounds: this.boundsWithoutColorLegend.padRight(
this.lineLegendDimensions
? this.lineLegendDimensions.width
: this.defaultRightPadding
),
verticalAxis: this.verticalAxisPart,
horizontalAxis: this.horizontalAxisPart,
})
}
@computed get yAxis(): VerticalAxis {
return this.dualAxis.verticalAxis
}
@computed get xAxis(): HorizontalAxis {
return this.dualAxis.horizontalAxis
}
@computed get externalLegend(): HorizontalColorLegendManager | undefined {
if (this.manager.hideLegend) {
const numericLegendData = this.hasColorScale
? this.numericLegendData
: []
const categoricalLegendData = this.hasColorScale
? []
: this.series.map(
(series, index) =>
new CategoricalBin({
index,
value: series.seriesName,
label: series.seriesName,
color: series.color,
})
)
return {
legendTitle: this.legendTitle,
legendTextColor: this.legendTextColor,
legendTickSize: this.legendTickSize,
equalSizeBins: this.equalSizeBins,
numericBinSize: this.numericBinSize,
numericBinStroke: this.numericBinStroke,
numericBinStrokeWidth: this.numericBinStrokeWidth,
numericLegendData,
categoricalLegendData,
}
}
return undefined
}
}
|