[Explore Vis] update new color scheme for heatmap

changelogs/fragments/10755.yml

@@ -0,0 +1,2 @@
+feat:
+- Update new color scheme for heatmap ([#10755](https://github.com/opensearch-project/OpenSearch-Dashboards/pull/10755))

src/plugins/explore/public/components/visualizations/heatmap/heatmap_chart_utils.test.ts

@@ -2,7 +2,13 @@
  * Copyright OpenSearch Contributors
  * SPDX-License-Identifier: Apache-2.0
  */
-import { createLabelLayer, getDataBound, addTransform, enhanceStyle } from './heatmap_chart_utils';
+import {
+  createLabelLayer,
+  getDataBound,
+  addTransform,
+  enhanceStyle,
+  generateSchemeList,
+} from './heatmap_chart_utils';
 import { AggregationType, VisFieldType, ColorSchemas, ScaleType, VisColumn } from '../types';
 import { DEFAULT_GREY } from '../theme/default_colors';
 import { defaultHeatmapChartStyles, HeatmapLabels, HeatmapChartStyle } from './heatmap_vis_config';
@@ -328,3 +334,25 @@ describe('enhanceStyle', () => {
     expect(markLayer).toEqual(baseMarkLayer);
   });
 });
+
+describe('generateSchemeList', () => {
+  it('should generate default 11 colors with center color matching target', () => {
+    const result = generateSchemeList('#ff0000');
+    expect(result).toHaveLength(11);
+    expect(result[5]).toBe('#ff0000');
+  });
+
+  it('should create lighter colors on left side', () => {
+    const result = generateSchemeList('#808080');
+    expect(result[0]).toBe('#e4e4e4');
+    expect(result[1]).toBe('#d0d0d0');
+    expect(result[5]).toBe('#808080');
+  });
+
+  it('should create darker colors on right side', () => {
+    const result = generateSchemeList('#808080');
+    expect(result[5]).toBe('#808080');
+    expect(result[6]).toBe('#6c6c6c');
+    expect(result[7]).toBe('#585858');
+  });
+});

src/plugins/explore/public/components/visualizations/heatmap/heatmap_chart_utils.ts

@@ -4,7 +4,7 @@
  */
 
 import type { Encoding } from 'vega-lite/build/src/encoding';
-import { AggregationType, VisColumn } from '../types';
+import { AggregationType, VisColumn, ColorSchemas } from '../types';
 import { HeatmapChartStyle } from './heatmap_vis_config';
 
 import { getColors, DEFAULT_GREY } from '../theme/default_colors';
@@ -117,3 +117,75 @@ export const enhanceStyle = (
     markLayer.encoding.color.scale.range = [DEFAULT_GREY, ...colorRange];
   }
 };
+
+export function generateSchemeList(targetHex: string, n = 11, step = 20) {
+  function hexToRgb(hex: string) {
+    hex = hex.replace('#', '');
+    if (hex.length === 3) {
+      hex = hex[0] + hex[0] + hex[1] + hex[1] + hex[2] + hex[2];
+    }
+    return {
+      r: parseInt(hex.slice(0, 2), 16),
+      g: parseInt(hex.slice(2, 4), 16),
+      b: parseInt(hex.slice(4, 6), 16),
+    };
+  }
+
+  function rgbToHex({ r, g, b }: { r: number; g: number; b: number }) {
+    return (
+      '#' +
+      r.toString(16).padStart(2, '0') +
+      g.toString(16).padStart(2, '0') +
+      b.toString(16).padStart(2, '0')
+    );
+  }
+
+  const half = Math.floor(n / 2);
+  const target = hexToRgb(targetHex);
+  const colors = [];
+
+  // Left side (lighter)
+  for (let i = half; i > 0; i--) {
+    colors.push(
+      rgbToHex({
+        r: Math.min(255, target.r + i * step),
+        g: Math.min(255, target.g + i * step),
+        b: Math.min(255, target.b + i * step),
+      })
+    );
+  }
+
+  // Center
+  colors.push(rgbToHex(target));
+
+  // Right side (darker)
+  for (let i = 1; i <= half; i++) {
+    colors.push(
+      rgbToHex({
+        r: Math.max(0, target.r - i * step),
+        g: Math.max(0, target.g - i * step),
+        b: Math.max(0, target.b - i * step),
+      })
+    );
+  }
+  return colors;
+}
+
+export const getColorRange = (colorSchema: ColorSchemas) => {
+  switch (colorSchema) {
+    case ColorSchemas.BLUES:
+      return generateSchemeList(getColors().categories[0]);
+    case ColorSchemas.PURPLES:
+      return generateSchemeList(getColors().categories[1]);
+    case ColorSchemas.ORANGES:
+      return generateSchemeList(getColors().categories[2]);
+    case ColorSchemas.YELLOWS:
+      return generateSchemeList(getColors().categories[3]);
+    case ColorSchemas.GREENS:
+      return generateSchemeList(getColors().categories[5]);
+    case ColorSchemas.REDS:
+      return generateSchemeList(getColors().categories[6]);
+    default:
+      return undefined;
+  }
+};

src/plugins/explore/public/components/visualizations/heatmap/to_expression.test.ts

@@ -11,6 +11,7 @@ jest.mock('./heatmap_chart_utils', () => ({
   enhanceStyle: jest.fn(),
   addTransform: jest.fn(() => []),
   createLabelLayer: jest.fn(() => null),
+  getColorRange: jest.fn(() => undefined),
 }));
 
 jest.mock('../utils/utils', () => ({

src/plugins/explore/public/components/visualizations/heatmap/to_expression.ts

@@ -6,7 +6,7 @@
 import { HeatmapChartStyle } from './heatmap_vis_config';
 import { VisColumn, VEGASCHEMA, AxisColumnMappings } from '../types';
 import { applyAxisStyling, getSwappedAxisRole, getSchemaByAxis } from '../utils/utils';
-import { createLabelLayer, enhanceStyle, addTransform } from './heatmap_chart_utils';
+import { createLabelLayer, enhanceStyle, addTransform, getColorRange } from './heatmap_chart_utils';
 
 export const createHeatmapWithBin = (
   transformedData: Array<Record<string, any>>,
@@ -103,6 +103,10 @@ export const createRegularHeatmap = (
   const colorField = colorFieldColumn?.column;
   const colorName = colorFieldColumn?.name;
 
+  const colorScale = getColorRange(styles.exclusive?.colorSchema)
+    ? { range: getColorRange(styles.exclusive?.colorSchema) }
+    : { scheme: styles.exclusive?.colorSchema };
+
   const markLayer: any = {
     mark: {
       type: 'rect',
@@ -131,7 +135,7 @@ export const createRegularHeatmap = (
           : false,
         scale: {
           type: styles.exclusive?.colorScaleType,
-          scheme: styles.exclusive?.colorSchema,
+          ...colorScale,
           reverse: styles.exclusive?.reverseSchema,
         },
         legend: styles.addLegend

src/plugins/explore/public/components/visualizations/theme/default_colors.ts

@@ -11,6 +11,9 @@ export const getColors = () => {
   // been implemented accordingly.
   const isExperimental =
     localStorage.getItem('__DEVELOPMENT__.discover.vis.theme') === 'experimental';
+
+  const euiPaletteColorBlindColors = euiPaletteColorBlind();
+
   if (isExperimental) {
     if (darkMode) {
       return {
@@ -69,7 +72,18 @@ export const getColors = () => {
     text: euiThemeVars.euiTextColor,
     grid: euiThemeVars.euiColorChartLines,
     backgroundShade: darkMode ? '#27252C' : '#f1f1f1ff',
-    categories: euiPaletteColorBlind(),
+    categories: [
+      euiPaletteColorBlindColors[1],
+      euiPaletteColorBlindColors[3],
+      euiPaletteColorBlindColors[9],
+      euiPaletteColorBlindColors[5],
+      euiPaletteColorBlindColors[1],
+      euiPaletteColorBlindColors[0],
+      euiPaletteColorBlindColors[2],
+      euiPaletteColorBlindColors[8],
+      euiPaletteColorBlindColors[0],
+      euiPaletteColorBlindColors[4],
+    ],
   };
 };
 

src/plugins/explore/public/components/visualizations/types.ts

@@ -206,9 +206,12 @@ export enum PointShape {
 
 export enum ColorSchemas {
   BLUES = 'blues',
+  PURPLES = 'purples',
+  ORANGES = 'oranges',
+  YELLOWS = 'yellows',
   GREENS = 'greens',
-  GREYS = 'greys',
   REDS = 'reds',
+  GREYS = 'greys',
   YELLOWORANGE = 'yelloworangered',
   GREENBLUE = 'greenblue',
 }

src/plugins/explore/public/components/visualizations/utils/collections.ts

@@ -55,17 +55,35 @@ export const getColorSchemas = () => [
     value: ColorSchemas.GREENS,
   },
   {
-    text: i18n.translate('explore.vis.colorSchemas.greys', {
-      defaultMessage: 'Greys',
+    text: i18n.translate('explore.vis.colorSchemas.purples', {
+      defaultMessage: 'Purples',
     }),
-    value: ColorSchemas.GREYS,
+    value: ColorSchemas.PURPLES,
   },
   {
     text: i18n.translate('explore.vis.colorSchemas.reds', {
       defaultMessage: 'Reds',
     }),
     value: ColorSchemas.REDS,
   },
+  {
+    text: i18n.translate('explore.vis.colorSchemas.greys', {
+      defaultMessage: 'Greys',
+    }),
+    value: ColorSchemas.GREYS,
+  },
+  {
+    text: i18n.translate('explore.vis.colorSchemas.yellows', {
+      defaultMessage: 'Yellows',
+    }),
+    value: ColorSchemas.YELLOWS,
+  },
+  {
+    text: i18n.translate('explore.vis.colorSchemas.oranges', {
+      defaultMessage: 'Oranges',
+    }),
+    value: ColorSchemas.ORANGES,
+  },
   {
     text: i18n.translate('explore.vis.colorSchemas.greenToBlue', {
       defaultMessage: 'Green to Blue',