feat(series): set custom series colors through spec prop

src/lib/series/series.test.ts

@@ -265,15 +265,15 @@ describe('Series', () => {
 
     const emptyCustomColors = new Map();
 
-    const defaultColorMap = getSeriesColorMap(seriesColors, chartColors, emptyCustomColors, specs);
+    const defaultColorMap = getSeriesColorMap(seriesColors, chartColors, emptyCustomColors);
     const expectedDefaultColorMap = new Map();
     expectedDefaultColorMap.set('spec1', 'elastic_charts_c1');
     expect(defaultColorMap).toEqual(expectedDefaultColorMap);
 
     const customColors: Map<string, string> = new Map();
     customColors.set('spec1', 'custom_color');
 
-    const customizedColorMap = getSeriesColorMap(seriesColors, chartColors, customColors, specs);
+    const customizedColorMap = getSeriesColorMap(seriesColors, chartColors, customColors);
     const expectedCustomizedColorMap = new Map();
     expectedCustomizedColorMap.set('spec1', 'custom_color');
     expect(customizedColorMap).toEqual(expectedCustomizedColorMap);

src/lib/series/series.ts

@@ -3,7 +3,6 @@ import { ColorConfig } from '../themes/theme';
 import { Accessor } from '../utils/accessor';
 import { GroupId, SpecId } from '../utils/ids';
 import { splitSpecsByGroupId, YBasicSeriesSpec } from './domains/y_domain';
-import { getSeriesColorLabel } from './legend';
 import { BasicSeriesSpec, Datum, SeriesAccessors } from './specs';
 
 export interface RawDataSeriesDatum {
@@ -148,7 +147,7 @@ function getColorValues(
 /**
  * Get the array of values that forms a series key
  */
-function getColorValuesAsString(colorValues: any[], specId: SpecId): string {
+export function getColorValuesAsString(colorValues: any[], specId: SpecId): string {
   return `specId:{${specId}},colors:{${colorValues}}`;
 }
 
@@ -392,17 +391,13 @@ export function getSeriesColorMap(
   seriesColors: Map<string, DataSeriesColorsValues>,
   chartColors: ColorConfig,
   customColors: Map<string, string>,
-  specs: Map<SpecId, BasicSeriesSpec>,
 ): Map<string, string> {
   const seriesColorMap = new Map<string, string>();
   let counter = 0;
 
-  seriesColors.forEach((value, seriesColorKey) => {
-    const spec = specs.get(value.specId);
-    const hasSingleSeries = seriesColors.size === 1;
-    const seriesLabel = getSeriesColorLabel(value, hasSingleSeries, spec);
-
-    const color = (seriesLabel && customColors.get(seriesLabel)) ||
+  seriesColors.forEach((value: DataSeriesColorsValues, seriesColorKey: string) => {
+    const customSeriesColor: string | undefined = customColors.get(seriesColorKey);
+    const color = customSeriesColor ||
       chartColors.vizColors[counter % chartColors.vizColors.length];
 
     seriesColorMap.set(

src/lib/series/specs.ts

@@ -4,6 +4,7 @@ import { Domain } from '../utils/domain';
 import { AxisId, GroupId, SpecId } from '../utils/ids';
 import { ScaleContinuousType, ScaleType } from '../utils/scales/scales';
 import { CurveType } from './curves';
+import { DataSeriesColorsValues } from './series';
 import { TooltipPosition } from './tooltip';
 
 export type Datum = any;
@@ -37,8 +38,12 @@ export interface SeriesSpec {
   yDomain?: Domain;
   /** The type of series you are looking to render */
   seriesType: 'bar' | 'line' | 'area' | 'basic';
+  /** Custom colors for series */
+  customSeriesColors?: CustomSeriesColorsMap;
 }
 
+export type CustomSeriesColorsMap = Map<DataSeriesColorsValues, string>;
+
 export interface SeriesAccessors {
   /** The field name of the x value on Datum object */
   xAccessor: Accessor;

src/state/chart_state.test.ts

@@ -483,16 +483,23 @@ describe('Chart Store', () => {
     store.computeChart = computeChart;
     store.legendItems = [firstLegendItem, secondLegendItem];
 
-    const expectedCustomColors = new Map();
-    expectedCustomColors.set(firstLegendItem.label, 'foo');
-
     store.setSeriesColor(-1, 'foo');
     expect(computeChart).not.toBeCalled();
     expect(store.customSeriesColors).toEqual(new Map());
 
     store.setSeriesColor(0, 'foo');
     expect(computeChart).toBeCalled();
-    expect(store.customSeriesColors).toEqual(expectedCustomColors);
+    expect(store.seriesSpecs.get(firstLegendItem.value.specId)).toBeUndefined();
+
+    store.addSeriesSpec(spec);
+    store.setSeriesColor(0, 'foo');
+    const expectedSpecCustomColorSeries = new Map();
+    expectedSpecCustomColorSeries.set(firstLegendItem.value, 'foo');
+    expect(spec.customSeriesColors).toEqual(expectedSpecCustomColorSeries);
+
+    store.setSeriesColor(1, 'bar');
+    expectedSpecCustomColorSeries.set(secondLegendItem.value, 'bar');
+    expect(spec.customSeriesColors).toEqual(expectedSpecCustomColorSeries);
   });
 
   test('can reset selectedDataSeries', () => {

src/state/chart_state.ts

@@ -50,6 +50,7 @@ import {
   getAllDataSeriesColorValues,
   getAxesSpecForSpecId,
   getLegendItemByIndex,
+  getUpdatedCustomSeriesColors,
   Transform,
   updateSelectedDataSeries,
 } from './utils';
@@ -293,8 +294,19 @@ export class ChartStore {
     const legendItem = getLegendItemByIndex(this.legendItems, legendItemIndex);
 
     if (legendItem) {
-      const key = legendItem.label;
-      this.customSeriesColors.set(key, color);
+      const { specId } = legendItem.value;
+
+      const spec = this.seriesSpecs.get(specId);
+      if (spec) {
+        if (spec.customSeriesColors) {
+          spec.customSeriesColors.set(legendItem.value, color);
+        } else {
+          const specCustomSeriesColors = new Map();
+          spec.customSeriesColors = specCustomSeriesColors;
+          spec.customSeriesColors.set(legendItem.value, color);
+        }
+      }
+
       this.computeChart();
     }
   });
@@ -438,6 +450,10 @@ export class ChartStore {
       this.selectedDataSeries = getAllDataSeriesColorValues(seriesDomains.seriesColors);
     }
 
+    // Merge all series spec custom colors with state custom colors map
+    const updatedCustomSeriesColors = getUpdatedCustomSeriesColors(this.seriesSpecs);
+    this.customSeriesColors = new Map([...this.customSeriesColors, ...updatedCustomSeriesColors]);
+
     // tslint:disable-next-line:no-console
     // console.log({colors: seriesDomains.seriesColors});
 
@@ -447,7 +463,6 @@ export class ChartStore {
       seriesDomains.seriesColors,
       this.chartTheme.colors,
       this.customSeriesColors,
-      this.seriesSpecs,
     );
 
     this.legendItems = computeLegend(

src/state/utils.test.ts

@@ -11,6 +11,7 @@ import {
   findSelectedDataSeries,
   getAllDataSeriesColorValues,
   getLegendItemByIndex,
+  getUpdatedCustomSeriesColors,
   updateSelectedDataSeries,
 } from './utils';
 
@@ -214,4 +215,36 @@ describe('Chart State utils', () => {
 
     expect(getAllDataSeriesColorValues(colorMap)).toEqual(expected);
   });
+  it('should get an updated customSeriesColor based on specs', () => {
+    const spec1: BasicSeriesSpec = {
+      id: getSpecId('spec1'),
+      groupId: getGroupId('group1'),
+      seriesType: 'line',
+      yScaleType: ScaleType.Log,
+      xScaleType: ScaleType.Linear,
+      xAccessor: 'x',
+      yAccessors: ['y'],
+      yScaleToDataExtent: false,
+      data: BARCHART_1Y0G,
+    };
+
+    const specs = new Map<SpecId, BasicSeriesSpec>();
+    specs.set(spec1.id, spec1);
+
+    const emptyCustomSeriesColors = getUpdatedCustomSeriesColors(specs);
+    expect(emptyCustomSeriesColors).toEqual(new Map());
+
+    const dataSeriesColorValues = {
+      specId: spec1.id,
+      colorValues: ['bar'],
+    };
+    spec1.customSeriesColors = new Map();
+    spec1.customSeriesColors.set(dataSeriesColorValues, 'custom_color');
+
+    const updatedCustomSeriesColors = getUpdatedCustomSeriesColors(specs);
+    const expectedCustomSeriesColors = new Map();
+    expectedCustomSeriesColors.set('specId:{spec1},colors:{bar}', 'custom_color');
+
+    expect(updatedCustomSeriesColors).toEqual(expectedCustomSeriesColors);
+  });
 });

src/state/utils.ts

@@ -18,6 +18,7 @@ import {
   DataSeries,
   DataSeriesColorsValues,
   FormattedDataSeries,
+  getColorValuesAsString,
   getFormattedDataseries,
   getSplittedSeries,
   RawDataSeries,
@@ -89,6 +90,20 @@ export function updateSelectedDataSeries(
   return updatedSeries;
 }
 
+export function getUpdatedCustomSeriesColors(seriesSpecs: Map<SpecId, BasicSeriesSpec>): Map<string, string> {
+  const updatedCustomSeriesColors = new Map();
+  seriesSpecs.forEach((spec: BasicSeriesSpec, id: SpecId) => {
+    if (spec.customSeriesColors) {
+      spec.customSeriesColors.forEach((color: string, seriesColorValues: DataSeriesColorsValues) => {
+        const { colorValues, specId } = seriesColorValues;
+        const seriesLabel = getColorValuesAsString(colorValues, specId);
+        updatedCustomSeriesColors.set(seriesLabel, color);
+      });
+    }
+  });
+  return updatedCustomSeriesColors;
+}
+
 export function computeSeriesDomains(
   seriesSpecs: Map<SpecId, BasicSeriesSpec>,
   selectedDataSeries?: DataSeriesColorsValues[] | null,

stories/styling.tsx

@@ -21,6 +21,9 @@ import {
   ScaleType,
   Settings,
 } from '../src/';
+import { DataSeriesColorsValues } from '../src/lib/series/series';
+import { CustomSeriesColorsMap } from '../src/lib/series/specs';
+import * as TestDatasets from '../src/lib/series/utils/test_dataset';
 import { DEFAULT_MISSING_COLOR } from '../src/lib/themes/theme_commons';
 
 function range(
@@ -348,4 +351,43 @@ storiesOf('Stylings', module)
         />
       </Chart>
     );
+  })
+  .add('series colors', () => {
+    // const customSeriesColors: SpecsCustomSeriesColorsMap = new Map();
+    const customSeriesColors: CustomSeriesColorsMap = new Map();
+    const dataSeriesColorValues: DataSeriesColorsValues = {
+      colorValues: ['cloudflare.com', 'direct-cdn', 'y2'],
+      specId: getSpecId('bars'),
+    };
+    customSeriesColors.set(dataSeriesColorValues, '#000');
+
+    return (
+      <Chart renderer="canvas" className={'story-chart'}>
+        <Settings showLegend={true} legendPosition={Position.Right} />
+        <Axis
+          id={getAxisId('bottom')}
+          position={Position.Bottom}
+          title={'Bottom axis'}
+          showOverlappingTicks={true}
+        />
+        <Axis
+          id={getAxisId('left2')}
+          title={'Left axis'}
+          position={Position.Left}
+          tickFormat={(d) => Number(d).toFixed(2)}
+        />
+
+        <BarSeries
+          id={getSpecId('bars')}
+          xScaleType={ScaleType.Linear}
+          yScaleType={ScaleType.Linear}
+          xAccessor="x"
+          yAccessors={['y1', 'y2']}
+          splitSeriesAccessors={['g1', 'g2']}
+          customSeriesColors={customSeriesColors}
+          data={TestDatasets.BARCHART_2Y2G}
+          yScaleToDataExtent={false}
+        />
+      </Chart>
+    );
   });