Introduces HorizontalGrid component

components/chart/horizontal-grid.js

@@ -0,0 +1,26 @@
+import React from 'react'
+import PropTypes from 'prop-types'
+import { View } from 'react-native'
+
+import { getTickPositions } from '../helpers/chart'
+
+import styles from './styles'
+
+const HorizontalGrid = ({ height, startPosition }) => {
+  return getTickPositions(height).map(tick => {
+    return (
+      <View
+        top={startPosition + tick}
+        {...styles.horizontalGrid}
+        key={tick}
+      />
+    )
+  })
+}
+
+HorizontalGrid.propTypes = {
+  height: PropTypes.number,
+  startPosition: PropTypes.number,
+}
+
+export default HorizontalGrid