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>;