add custom-grid and associated files + test - test needs plugin config to work with d3-path and jest

component/bar.tsx

@@ -0,0 +1,48 @@
+import React from 'react';
+import { Path } from 'react-native-svg';
+
+import { calculateBarProps, drawBarPath } from './custom-bar-utils';
+import { ScaleFunction } from './graph-types';
+
+interface BarProps {
+  scaleX: ScaleFunction;
+  scaleY: ScaleFunction;
+  data: { value: number };
+  barNumber: number;
+  index: number;
+  fill: string;
+  barWidth: number;
+  gap: number;
+  roundedRadius: number;
+}
+
+export const Bar: React.FC<BarProps> = ({
+  scaleX,
+  scaleY,
+  data,
+  barNumber,
+  index,
+  fill,
+  barWidth,
+  gap,
+  roundedRadius
+}) => {
+  const { xOrigin, yOrigin, height } = calculateBarProps({
+    scaleX,
+    scaleY,
+    index,
+    data,
+    barNumber,
+    barWidth,
+    gap
+  });
+
+  return (
+    <Path
+    key={`bar-${barNumber}-${index}`}
+    d={drawBarPath(xOrigin, yOrigin, barWidth, height, roundedRadius)}
+    fill={fill}
+    testID={`bar-${barNumber}-${index}`}
+    />
+  );
+};

component/custom-bar-utils.ts

@@ -0,0 +1,59 @@
+import { path as d3 } from 'd3-path';
+
+import { ScaleFunction } from './graph-types';
+
+type BarCalculationProps = {
+  scaleX: ScaleFunction;
+  scaleY: ScaleFunction;
+  data: { value: number };
+  barNumber: number;
+  index: number;
+  barWidth: number;
+  gap: number;
+};
+
+export function calculateBarProps({
+  scaleX,
+  scaleY,
+  barWidth,
+  data,
+  index,
+  barNumber,
+  gap
+}: BarCalculationProps): { xOrigin: number; yOrigin: number; height: number } {
+  const firstBar = barNumber === 0;
+  const xOrigin = scaleX(index) + (firstBar ? 0 : barWidth * barNumber + gap * barNumber);
+  const yOrigin = scaleY(data.value);
+  const height = scaleY(0) - yOrigin;
+
+  return { xOrigin, yOrigin, height };
+}
+
+export function drawBarPath(
+  xOrigin: number,
+  yOrigin: number,
+  barWidth: number,
+  height: number,
+  roundedRadius: number
+): string {
+  const path = d3();
+  path.moveTo(xOrigin, yOrigin + height);
+  path.lineTo(xOrigin, yOrigin + roundedRadius);
+  path.arcTo(xOrigin, yOrigin, xOrigin + roundedRadius, yOrigin, roundedRadius);
+  path.lineTo(xOrigin + barWidth - roundedRadius, yOrigin);
+  path.arcTo(
+    xOrigin + barWidth,
+    yOrigin,
+    xOrigin + barWidth,
+    yOrigin + roundedRadius,
+    roundedRadius
+  );
+  path.lineTo(xOrigin + barWidth, yOrigin + height);
+  path.lineTo(xOrigin, yOrigin + height);
+  path.closePath();
+
+  return path.toString();
+}
+
+export const calculateBarWidth = (bandwidth: number, combinedDataLength: number, gap: number) =>
+  (bandwidth - gap * (combinedDataLength - 1)) / combinedDataLength;

component/custom-bars.tsx

@@ -0,0 +1,54 @@
+
+import { Svg } from 'react-native-svg';
+
+import { Bar } from './bar';
+import { ScaleFunction } from './graph-types';
+import { calculateBarWidth } from './custom-bar-utils';
+
+export interface CombinedData {
+  data: { value: number }[];
+  svg: { fill: string };
+}
+
+interface CustomBarsProps {
+  x: ScaleFunction;
+  y: ScaleFunction;
+  bandwidth: number;
+  barColors: string[];
+  rawData: unknown[]; // TODO: update this value when this data type is defined
+  combinedData: CombinedData[];
+  gap: number;
+  roundedRadius: number;
+}
+
+export const CustomBars: React.FC<Partial<CustomBarsProps>> = ({
+  x: scaleX,
+  y: scaleY,
+  bandwidth,
+  combinedData,
+  rawData,
+  barColors,
+  gap = 2,
+  roundedRadius = 4
+}) => {
+  const barWidth = calculateBarWidth(bandwidth, combinedData.length, gap);
+
+  return rawData.map((_, index) => (
+    <Svg key={`group-${index}`} testID={`svg-${index}`}>
+      {combinedData.map((item, i) => (
+        <Bar
+          key={`bar-${i}-${index}`}
+          scaleX={scaleX}
+          scaleY={scaleY}
+          data={item.data[index]}
+          barNumber={i}
+          index={index}
+          fill={barColors[i]}
+          barWidth={barWidth}
+          gap={gap}
+          roundedRadius={roundedRadius}
+        />
+      ))}
+    </Svg>
+  ));
+};

component/custom-grid.tsx

@@ -1,12 +1,10 @@
 import React from 'react';
 import { G, Line } from 'react-native-svg';
-import { ScaleLinear } from 'd3-scale'
 import { colors } from '../styles';
-
-type scaleFunction = ScaleLinear<number, number>;
+import { ScaleFunction } from './graph-types';
 
 interface CustomGridProps {
-  y: scaleFunction;
+  y: ScaleFunction;
   ticks: Array<number>;
 }
 

component/graph-types.ts

@@ -0,0 +1,3 @@
+import { ScaleLinear } from 'd3-scale'
+
+export type ScaleFunction = ScaleLinear<number, number>;

package.json

@@ -23,6 +23,7 @@
         "@typescript-eslint/eslint-plugin": "^6.17.0",
         "@typescript-eslint/parser": "^6.17.0",
         "babel-plugin-inline-dotenv": "^1.7.0",
+        "d3-path": "^3.1.0",
         "d3-scale": "1.0.6",
         "eslint": "^8.56.0",
         "eslint-plugin-react": "^7.33.2",
@@ -43,6 +44,7 @@
         "@babel/core": "^7.20.0",
         "@testing-library/jest-native": "^5.4.3",
         "@testing-library/react-native": "^12.4.3",
+        "@types/d3-path": "^3.0.2",
         "@types/jest": "^29.5.11",
         "eslint-config-prettier": "^9.1.0"
     },

test/component/custom-bars.test.tsx

@@ -0,0 +1,83 @@
+import React from 'react';
+import { render } from '@testing-library/react-native';
+import "@testing-library/jest-native/extend-expect";
+
+import { CustomBars } from '../../component/custom-bars';
+
+describe('CustomBars Component Tests', () => {
+  const mockScaleFunction = jest.fn();
+  const mockCombinedData = [
+    {
+      data: [{ value: 10 }],
+      svg: { fill: 'red' },
+    },
+    {
+      data: [{ value: 20 }],
+      svg: { fill: 'blue' },
+    },
+  ];
+  const mockRawData = [{}, {}];
+  const mockBarColors = ['red', 'blue'];
+  const mockBandwidth = 100;
+  const mockGap = 2;
+  const mockRoundedRadius = 4;
+
+  it('should render correct number of Svg and Bar components', () => {
+    const { getAllByTestId } = render(
+      <CustomBars
+        x={mockScaleFunction}
+        y={mockScaleFunction}
+        bandwidth={mockBandwidth}
+        combinedData={mockCombinedData}
+        rawData={mockRawData}
+        barColors={mockBarColors}
+        gap={mockGap}
+        roundedRadius={mockRoundedRadius}
+      />
+    );
+
+    const svgs = getAllByTestId(/svg-/);
+    const bars = getAllByTestId(/bar-/);
+
+    expect(svgs.length).toHaveLength(mockRawData.length);
+    expect(bars.length).toHaveLength(mockCombinedData.length * mockRawData.length);
+  });
+
+  it('should pass correct props to Bar components', () => {
+    const { getAllByTestId } = render(
+      <CustomBars
+        x={mockScaleFunction}
+        y={mockScaleFunction}
+        bandwidth={mockBandwidth}
+        combinedData={mockCombinedData}
+        rawData={mockRawData}
+        barColors={mockBarColors}
+        gap={mockGap}
+        roundedRadius={mockRoundedRadius}
+      />
+    );
+  
+    const bars = getAllByTestId(/bar-/);  // Regex pattern to match testIDs of Bar components
+    bars.forEach((bar) => {
+      // Extract indices from the testID
+      const testId = bar.props.testID;
+      // eslint-disable-next-line no-unused-vars, @typescript-eslint/no-unused-vars
+      const [_, barNumber, index] = testId.split('-').map(Number);
+  
+      const item = mockCombinedData[barNumber];
+      const data = item.data[index];
+  
+      expect(bar.props).toEqual({
+        scaleX: mockScaleFunction,
+        scaleY: mockScaleFunction,
+        data: data,
+        barNumber: barNumber,
+        index: index,
+        fill: mockBarColors[barNumber],
+        barWidth: expect.any(Number),
+        gap: mockGap,
+        roundedRadius: mockRoundedRadius,
+      });
+    });
+  });
+});

yarn.lock

@@ -2296,6 +2296,11 @@
   dependencies:
     "@babel/types" "^7.20.7"
 
+"@types/d3-path@^3.0.2":
+  version "3.0.2"
+  resolved "https://registry.yarnpkg.com/@types/d3-path/-/d3-path-3.0.2.tgz#4327f4a05d475cf9be46a93fc2e0f8d23380805a"
+  integrity sha512-WAIEVlOCdd/NKRYTsqCpOMHQHemKBEINf8YXMYOtXH0GA7SY0dqMB78P3Uhgfy+4X+/Mlw2wDtlETkN6kQUCMA==
+
 "@types/graceful-fs@^4.1.3":
   version "4.1.9"
   resolved "https://registry.yarnpkg.com/@types/graceful-fs/-/graceful-fs-4.1.9.tgz#2a06bc0f68a20ab37b3e36aa238be6abdf49e8b4"
@@ -3683,6 +3688,11 @@ d3-interpolate@1:
   dependencies:
     d3-color "1"
 
+d3-path@^3.1.0:
+  version "3.1.0"
+  resolved "https://registry.yarnpkg.com/d3-path/-/d3-path-3.1.0.tgz#22df939032fb5a71ae8b1800d61ddb7851c42526"
+  integrity sha512-p3KP5HCf/bvjBSSKuXid6Zqijx7wIfNW+J/maPs+iwR35at5JCbLUT0LzF1cnjbCHWhqzQTIN2Jpe8pRebIEFQ==
+
 d3-scale@1.0.6:
   version "1.0.6"
   resolved "https://registry.yarnpkg.com/d3-scale/-/d3-scale-1.0.6.tgz#bce19da80d3a0cf422c9543ae3322086220b34ed"