add spline chart and line color customization

ui/charts/SplineChartExample.tsx

+import { useToken } from '@chakra-ui/react';
+import React from 'react';
+
+import ethTxsData from 'data/charts_eth_txs.json';
+import ChartLine from 'ui/shared/chart/ChartLine';
+import useChartSize from 'ui/shared/chart/useChartSize';
+import useTimeChartController from 'ui/shared/chart/useTimeChartController';
+import { BlueLinearGradient } from 'ui/shared/chart/utils/gradients';
+
+const CHART_MARGIN = { bottom: 0, left: 0, right: 0, top: 0 };
+const DATA = ethTxsData.slice(-30).map((d) => ({ ...d, date: new Date(d.date) }));
+
+const SplineChartExample = () => {
+  const ref = React.useRef<SVGSVGElement>(null);
+  const { width, height, innerWidth, innerHeight } = useChartSize(ref.current, CHART_MARGIN);
+  const color = useToken('colors', 'blue.500');
+  const { xScale, yScale } = useTimeChartController({
+    data: [ { items: DATA, name: 'spline', color } ],
+    width: innerWidth,
+    height: innerHeight,
+  });
+
+  return (
+    <svg width={ width || '100%' } height={ height || '100%' } ref={ ref }>
+      <defs>
+        <BlueLinearGradient.defs/>
+      </defs>
+      <ChartLine
+        data={ DATA }
+        xScale={ xScale }
+        yScale={ yScale }
+        stroke={ `url(#${ BlueLinearGradient.id })` }
+        animation="left"
+        strokeWidth={ 3 }
+      />
+    </svg>
+  );
+};
+
+export default SplineChartExample;

ui/pages/Graph.tsx

@@ -2,6 +2,7 @@ import { Box, Heading } from '@chakra-ui/react';
 import React from 'react';
 
 import EthereumChart from 'ui/charts/EthereumChart';
+import SplineChartExample from 'ui/charts/SplineChartExample';
 import Page from 'ui/shared/Page/Page';
 import PageTitle from 'ui/shared/Page/PageTitle';
 
@@ -13,6 +14,10 @@ const Graph = () => {
       <Box w="100%" h="400px">
         <EthereumChart/>
       </Box>
+      <Heading as="h2" size="sm" fontWeight="500" mb={ 3 } mt="100px">Ethereum Daily Transactions For Last Month</Heading>
+      <Box w="240px" h="150px">
+        <SplineChartExample/>
+      </Box>
     </Page>
   );
 };

ui/shared/chart/ChartArea.tsx

@@ -6,7 +6,7 @@ import type { TimeChartItem } from 'ui/shared/chart/types';
 interface Props extends React.SVGProps<SVGPathElement> {
   xScale: d3.ScaleTime<number, number> | d3.ScaleLinear<number, number>;
   yScale: d3.ScaleTime<number, number> | d3.ScaleLinear<number, number>;
-  color: string;
+  color?: string;
   data: Array<TimeChartItem>;
   disableAnimation?: boolean;
 }
@@ -28,19 +28,22 @@ const ChartArea = ({ xScale, yScale, color, data, disableAnimation, ...props }:
     const area = d3.area<TimeChartItem>()
       .x(({ date }) => xScale(date))
       .y1(({ value }) => yScale(value))
-      .y0(() => yScale(yScale.domain()[0]));
+      .y0(() => yScale(yScale.domain()[0]))
+      .curve(d3.curveNatural);
     return area(data) || undefined;
   }, [ xScale, yScale, data ]);
 
   return (
     <>
-      <path ref={ ref } d={ d } fill={ `url(#gradient-${ color })` } opacity={ 0 } { ...props }/>
-      <defs>
-        <linearGradient id={ `gradient-${ color }` } x1="0%" x2="0%" y1="0%" y2="100%">
-          <stop offset="0%" stopColor={ color } stopOpacity={ 1 }/>
-          <stop offset="100%" stopColor={ color } stopOpacity={ 0.15 }/>
-        </linearGradient>
-      </defs>
+      <path ref={ ref } d={ d } fill={ color ? `url(#gradient-${ color })` : 'none' } opacity={ 0 } { ...props }/>
+      { color && (
+        <defs>
+          <linearGradient id={ `gradient-${ color }` } x1="0%" x2="0%" y1="0%" y2="100%">
+            <stop offset="0%" stopColor={ color } stopOpacity={ 0.8 }/>
+            <stop offset="100%" stopColor={ color } stopOpacity={ 0.02 }/>
+          </linearGradient>
+        </defs>
+      ) }
     </>
   );
 };

ui/shared/chart/ChartLine.tsx

@@ -61,7 +61,8 @@ const ChartLine = ({ xScale, yScale, data, animation, ...props }: Props) => {
 
   const line = d3.line<TimeChartItem>()
     .x((d) => xScale(d.date))
-    .y((d) => yScale(d.value));
+    .y((d) => yScale(d.value))
+    .curve(d3.curveNatural);
 
   return (
     <path

ui/shared/chart/types.tsx

@@ -13,7 +13,7 @@ export interface ChartMargin {
 export interface TimeChartDataItem {
   items: Array<TimeChartItem>;
   name: string;
-  color: string;
+  color?: string;
 }
 
 export type TimeChartData = Array<TimeChartDataItem>;

ui/shared/chart/utils/gradients.tsx

+import React from 'react';
+
+export const BlueLinearGradient = {
+  id: 'blue-linear-gradient',
+  defs: () => (
+    <linearGradient id="blue-linear-gradient">
+      <stop offset="0%" stopColor="#4299E1"/>
+      <stop offset="100%" stopColor="#00B5D8"/>
+    </linearGradient>
+  ),
+};
+
+export const RainbowGradient = {
+  id: 'rainbow-gradient',
+  defs: () => (
+    <linearGradient id="rainbow-gradient">
+      <stop offset="0%" stopColor="rgba(255, 0, 0, 1)"/>
+      <stop offset="10%" stopColor="rgba(255, 154, 0, 1)"/>
+      <stop offset="20%" stopColor="rgba(208, 222, 33, 1)"/>
+      <stop offset="30%" stopColor="rgba(79, 220, 74, 1)"/>
+      <stop offset="40%" stopColor="rgba(63, 218, 216, 1)"/>
+      <stop offset="50%" stopColor="rgba(47, 201, 226, 1)"/>
+      <stop offset="60%" stopColor="rgba(28, 127, 238, 1)"/>
+      <stop offset="70%" stopColor="rgba(95, 21, 242, 1)"/>
+      <stop offset="80%" stopColor="rgba(186, 12, 248, 1)"/>
+      <stop offset="90%" stopColor="rgba(251, 7, 217, 1)"/>
+      <stop offset="100%" stopColor="rgba(255, 0, 0, 1)"/>
+    </linearGradient>
+  ),
+};