Stats: give emphasis to incomplete data days (#2085)

* draw dotted line for incomplete data

* add title to tooltip

* refactor parts into separate components

* move utils

* refactor render logic of tooltip

* more refactoring

* fix issue in safari

* tweaks

* test

* make an approximation as a straight line.

* update screenshots

* fix the tooltip hiding behavior.

* add prop for disabling animation

ui/address/AddressCoinBalance.pw.tsx

@@ -19,6 +19,7 @@ test('base view +@dark-mode +@mobile', async({ render, page, mockApiResponse })
   await page.waitForFunction(() => {
     return document.querySelector('path[data-name="chart-Balances-small"]')?.getAttribute('opacity') === '1';
   });
+  await page.mouse.move(100, 100);
   await page.mouse.move(240, 100);
   await expect(component).toHaveScreenshot();
 });

ui/home/indicators/ChainIndicators.pw.tsx

@@ -56,7 +56,7 @@ test('partial data', async({ page, mockApiResponse, mockAssetResponse, render })
 test('no data', async({ mockApiResponse, mockAssetResponse, render }) => {
   await mockApiResponse('stats', statsMock.noChartData);
   await mockApiResponse('stats_charts_txs', dailyTxsMock.noData);
-  await mockAssetResponse(statsMock.base.coin_image as string, './playwright/mocks/image_s.jpg');
+  await mockAssetResponse(statsMock.noChartData.coin_image as string, './playwright/mocks/image_s.jpg');
 
   const component = await render(<ChainIndicators/>);
   await expect(component).toHaveScreenshot();

ui/shared/chart/ChartArea.tsx

@@ -11,10 +11,10 @@ interface Props extends React.SVGProps<SVGPathElement> {
   yScale: d3.ScaleTime<number, number> | d3.ScaleLinear<number, number>;
   color?: string;
   data: Array<TimeChartItem>;
-  disableAnimation?: boolean;
+  noAnimation?: boolean;
 }
 
-const ChartArea = ({ id, xScale, yScale, color, data, disableAnimation, ...props }: Props) => {
+const ChartArea = ({ id, xScale, yScale, color, data, noAnimation, ...props }: Props) => {
   const ref = React.useRef(null);
   const theme = useTheme();
 
@@ -26,7 +26,7 @@ const ChartArea = ({ id, xScale, yScale, color, data, disableAnimation, ...props
   };
 
   React.useEffect(() => {
-    if (disableAnimation) {
+    if (noAnimation) {
       d3.select(ref.current).attr('opacity', 1);
       return;
     }
@@ -34,10 +34,11 @@ const ChartArea = ({ id, xScale, yScale, color, data, disableAnimation, ...props
       .duration(750)
       .ease(d3.easeBackIn)
       .attr('opacity', 1);
-  }, [ disableAnimation ]);
+  }, [ noAnimation ]);
 
   const d = React.useMemo(() => {
     const area = d3.area<TimeChartItem>()
+      .defined(({ isApproximate }) => !isApproximate)
       .x(({ date }) => xScale(date))
       .y1(({ value }) => yScale(value))
       .y0(() => yScale(yScale.domain()[0]))

ui/shared/chart/ChartAxis.tsx

@@ -5,13 +5,13 @@ import React from 'react';
 interface Props extends Omit<React.SVGProps<SVGGElement>, 'scale'> {
   type: 'left' | 'bottom';
   scale: d3.ScaleTime<number, number> | d3.ScaleLinear<number, number>;
-  disableAnimation?: boolean;
+  noAnimation?: boolean;
   ticks: number;
   tickFormatGenerator?: (axis: d3.Axis<d3.NumberValue>) => (domainValue: d3.AxisDomain, index: number) => string;
   anchorEl?: SVGRectElement | null;
 }
 
-const ChartAxis = ({ type, scale, ticks, tickFormatGenerator, disableAnimation, anchorEl, ...props }: Props) => {
+const ChartAxis = ({ type, scale, ticks, tickFormatGenerator, noAnimation, anchorEl, ...props }: Props) => {
   const ref = React.useRef<SVGGElement>(null);
 
   const textColorToken = useColorModeValue('blackAlpha.600', 'whiteAlpha.500');
@@ -31,7 +31,7 @@ const ChartAxis = ({ type, scale, ticks, tickFormatGenerator, disableAnimation,
 
     const axisGroup = d3.select(ref.current);
 
-    if (disableAnimation) {
+    if (noAnimation) {
       axisGroup.call(axis);
     } else {
       axisGroup.transition().duration(750).ease(d3.easeLinear).call(axis);
@@ -42,7 +42,7 @@ const ChartAxis = ({ type, scale, ticks, tickFormatGenerator, disableAnimation,
       .attr('opacity', 1)
       .attr('color', textColor)
       .attr('font-size', '0.75rem');
-  }, [ scale, ticks, tickFormatGenerator, disableAnimation, type, textColor ]);
+  }, [ scale, ticks, tickFormatGenerator, noAnimation, type, textColor ]);
 
   React.useEffect(() => {
     if (!anchorEl) {

ui/shared/chart/ChartGridLine.tsx

@@ -5,12 +5,12 @@ import React from 'react';
 interface Props extends Omit<React.SVGProps<SVGGElement>, 'scale'> {
   type: 'vertical' | 'horizontal';
   scale: d3.ScaleTime<number, number> | d3.ScaleLinear<number, number>;
-  disableAnimation?: boolean;
+  noAnimation?: boolean;
   size: number;
   ticks: number;
 }
 
-const ChartGridLine = ({ type, scale, ticks, size, disableAnimation, ...props }: Props) => {
+const ChartGridLine = ({ type, scale, ticks, size, noAnimation, ...props }: Props) => {
   const ref = React.useRef<SVGGElement>(null);
 
   const strokeColor = useToken('colors', 'divider');
@@ -24,7 +24,7 @@ const ChartGridLine = ({ type, scale, ticks, size, disableAnimation, ...props }:
     const axis = axisGenerator(scale).ticks(ticks).tickSize(-size);
 
     const gridGroup = d3.select(ref.current);
-    if (disableAnimation) {
+    if (noAnimation) {
       gridGroup.call(axis);
     } else {
       gridGroup.transition().duration(750).ease(d3.easeLinear).call(axis);
@@ -32,7 +32,7 @@ const ChartGridLine = ({ type, scale, ticks, size, disableAnimation, ...props }:
     gridGroup.select('.domain').remove();
     gridGroup.selectAll('text').remove();
     gridGroup.selectAll('line').attr('stroke', strokeColor);
-  }, [ scale, ticks, size, disableAnimation, type, strokeColor ]);
+  }, [ scale, ticks, size, noAnimation, type, strokeColor ]);
 
   return <g ref={ ref } { ...props }/>;
 };

ui/shared/chart/ChartLine.tsx

@@ -3,56 +3,38 @@ import React from 'react';
 
 import type { TimeChartItem } from 'ui/shared/chart/types';
 
+import type { AnimationType } from './utils/animations';
+import { ANIMATIONS } from './utils/animations';
+import { getIncompleteDataLineSource } from './utils/formatters';
+
 interface Props extends React.SVGProps<SVGPathElement> {
   xScale: d3.ScaleTime<number, number> | d3.ScaleLinear<number, number>;
   yScale: d3.ScaleTime<number, number> | d3.ScaleLinear<number, number>;
   data: Array<TimeChartItem>;
-  animation: 'left' | 'fadeIn' | 'none';
+  animation: AnimationType;
 }
 
 const ChartLine = ({ xScale, yScale, data, animation, ...props }: Props) => {
-  const ref = React.useRef<SVGPathElement>(null);
-
-  // Define different types of animation that we can use
-  const animateLeft = React.useCallback(() => {
-    const totalLength = ref.current?.getTotalLength() || 0;
-    d3.select(ref.current)
-      .attr('opacity', 1)
-      .attr('stroke-dasharray', `${ totalLength },${ totalLength }`)
-      .attr('stroke-dashoffset', totalLength)
-      .transition()
-      .duration(750)
-      .ease(d3.easeLinear)
-      .attr('stroke-dashoffset', 0);
-  }, []);
-
-  const animateFadeIn = React.useCallback(() => {
-    d3.select(ref.current)
-      .transition()
-      .duration(750)
-      .ease(d3.easeLinear)
-      .attr('opacity', 1);
-  }, []);
-
-  const noneAnimation = React.useCallback(() => {
-    d3.select(ref.current).attr('opacity', 1);
-  }, []);
+  const dataPathRef = React.useRef<SVGPathElement>(null);
+  const incompleteDataPathRef = React.useRef<SVGPathElement>(null);
 
   React.useEffect(() => {
-    const ANIMATIONS = {
-      left: animateLeft,
-      fadeIn: animateFadeIn,
-      none: noneAnimation,
-    };
     const animationFn = ANIMATIONS[animation];
-    window.setTimeout(animationFn, 100);
-  }, [ animateLeft, animateFadeIn, noneAnimation, animation ]);
+    const timeoutId = window.setTimeout(() => {
+      dataPathRef.current && animationFn(dataPathRef.current);
+      incompleteDataPathRef.current && animationFn(incompleteDataPathRef.current);
+    }, 100);
+
+    return () => {
+      window.clearTimeout(timeoutId);
+    };
+  }, [ animation ]);
 
   // Recalculate line length if scale has changed
   React.useEffect(() => {
     if (animation === 'left') {
-      const totalLength = ref.current?.getTotalLength();
-      d3.select(ref.current).attr(
+      const totalLength = dataPathRef.current?.getTotalLength();
+      d3.select(dataPathRef.current).attr(
         'stroke-dasharray',
         `${ totalLength },${ totalLength }`,
       );
@@ -65,15 +47,27 @@ const ChartLine = ({ xScale, yScale, data, animation, ...props }: Props) => {
     .curve(d3.curveMonotoneX);
 
   return (
-    <path
-      ref={ ref }
-      d={ line(data) || undefined }
-      strokeWidth={ 1 }
-      strokeLinecap="round"
-      fill="none"
-      opacity={ 0 }
-      { ...props }
-    />
+    <>
+      <path
+        ref={ incompleteDataPathRef }
+        d={ line(getIncompleteDataLineSource(data)) || undefined }
+        strokeWidth={ 1 }
+        strokeLinecap="round"
+        fill="none"
+        strokeDasharray="6 6"
+        opacity={ 0 }
+        { ...props }
+      />
+      <path
+        ref={ dataPathRef }
+        d={ line(data.filter(({ isApproximate }) => !isApproximate)) || undefined }
+        strokeWidth={ 1 }
+        strokeLinecap="round"
+        fill="none"
+        opacity={ 0 }
+        { ...props }
+      />
+    </>
   );
 };
 

ui/shared/chart/ChartWidget.pw.tsx

 import React from 'react';
 
+import type { TimeChartItem } from './types';
+
 import { test, expect } from 'playwright/lib';
 
 import type { Props } from './ChartWidget';
@@ -26,6 +28,7 @@ const props: Props = {
   units: 'ETH',
   isLoading: false,
   isError: false,
+  noAnimation: true,
 };
 
 test('base view +@dark-mode', async({ render, page }) => {
@@ -41,6 +44,7 @@ test('base view +@dark-mode', async({ render, page }) => {
 
   await page.mouse.move(0, 0);
   await page.mouse.click(0, 0);
+  await page.mouse.move(80, 150);
   await page.mouse.move(100, 150);
   await expect(component).toHaveScreenshot();
 
@@ -109,3 +113,24 @@ test('small variations in big values', async({ render, page }) => {
   });
   await expect(component).toHaveScreenshot();
 });
+
+test('incomplete day', async({ render, page }) => {
+  const modifiedProps = {
+    ...props,
+    items: [
+      ...props.items as Array<TimeChartItem>,
+      { date: new Date('2023-02-24'), value: 25136740.887217894 / 4, isApproximate: true },
+    ],
+  };
+
+  const component = await render(<ChartWidget { ...modifiedProps }/>);
+  await page.waitForFunction(() => {
+    return document.querySelector('path[data-name="chart-Nativecoincirculatingsupply-small"]')?.getAttribute('opacity') === '1';
+  });
+  await expect(component).toHaveScreenshot();
+
+  await page.hover('.ChartOverlay', { position: { x: 120, y: 120 } });
+  await page.hover('.ChartOverlay', { position: { x: 320, y: 120 } });
+  await expect(page.getByText('Incomplete day')).toBeVisible();
+  await expect(component).toHaveScreenshot();
+});

ui/shared/chart/ChartWidget.tsx

@@ -36,11 +36,12 @@ export type Props = {
   className?: string;
   isError: boolean;
   emptyText?: string;
+  noAnimation?: boolean;
 }
 
 const DOWNLOAD_IMAGE_SCALE = 5;
 
-const ChartWidget = ({ items, title, description, isLoading, className, isError, units, emptyText }: Props) => {
+const ChartWidget = ({ items, title, description, isLoading, className, isError, units, emptyText, noAnimation }: Props) => {
   const ref = useRef<HTMLDivElement>(null);
   const [ isFullscreen, setIsFullscreen ] = useState(false);
   const [ isZoomResetInitial, setIsZoomResetInitial ] = React.useState(true);
@@ -148,6 +149,7 @@ const ChartWidget = ({ items, title, description, isLoading, className, isError,
           isZoomResetInitial={ isZoomResetInitial }
           title={ title }
           units={ units }
+          noAnimation={ noAnimation }
         />
       </Box>
     );

ui/shared/chart/ChartWidgetGraph.tsx

@@ -23,13 +23,14 @@ interface Props {
   onZoom: () => void;
   isZoomResetInitial: boolean;
   margin?: ChartMargin;
+  noAnimation?: boolean;
 }
 
 // temporarily turn off the data aggregation, we need a better algorithm for that
 const MAX_SHOW_ITEMS = 100_000_000_000;
 const DEFAULT_CHART_MARGIN = { bottom: 20, left: 10, right: 20, top: 10 };
 
-const ChartWidgetGraph = ({ isEnlarged, items, onZoom, isZoomResetInitial, title, margin: marginProps, units }: Props) => {
+const ChartWidgetGraph = ({ isEnlarged, items, onZoom, isZoomResetInitial, title, margin: marginProps, units, noAnimation }: Props) => {
   const isMobile = useIsMobile();
   const color = useToken('colors', 'blue.200');
   const chartId = `chart-${ title.split(' ').join('') }-${ isEnlarged ? 'fullscreen' : 'small' }`;
@@ -99,7 +100,7 @@ const ChartWidgetGraph = ({ isEnlarged, items, onZoom, isZoomResetInitial, title
           scale={ axes.y.scale }
           ticks={ axesConfig.y.ticks }
           size={ innerWidth }
-          disableAnimation
+          noAnimation
         />
 
         <ChartArea
@@ -108,6 +109,7 @@ const ChartWidgetGraph = ({ isEnlarged, items, onZoom, isZoomResetInitial, title
           color={ color }
           xScale={ axes.x.scale }
           yScale={ axes.y.scale }
+          noAnimation={ noAnimation }
         />
 
         <ChartLine
@@ -124,7 +126,7 @@ const ChartWidgetGraph = ({ isEnlarged, items, onZoom, isZoomResetInitial, title
           scale={ axes.y.scale }
           ticks={ axesConfig.y.ticks }
           tickFormatGenerator={ axes.y.tickFormatter }
-          disableAnimation
+          noAnimation
         />
 
         <ChartAxis
@@ -134,7 +136,7 @@ const ChartWidgetGraph = ({ isEnlarged, items, onZoom, isZoomResetInitial, title
           ticks={ axesConfig.x.ticks }
           anchorEl={ overlayRef.current }
           tickFormatGenerator={ axes.x.tickFormatter }
-          disableAnimation
+          noAnimation
         />
 
         <ChartOverlay ref={ overlayRef } width={ innerWidth } height={ innerHeight }>
@@ -146,6 +148,7 @@ const ChartWidgetGraph = ({ isEnlarged, items, onZoom, isZoomResetInitial, title
             xScale={ axes.x.scale }
             yScale={ axes.y.scale }
             data={ chartData }
+            noAnimation={ noAnimation }
           />
 
           <ChartSelectionX

ui/shared/chart/tooltip/ChartTooltipBackdrop.tsx

+import { useToken } from '@chakra-ui/react';
+import * as d3 from 'd3';
+import React from 'react';
+
+import { calculateContainerHeight } from './utils';
+
+const ChartTooltipBackdrop = () => {
+  const bgColor = useToken('colors', 'blackAlpha.900');
+
+  return (
+    <rect
+      className="ChartTooltip__backdrop"
+      rx={ 12 }
+      ry={ 12 }
+      fill={ bgColor }
+    />
+  );
+};
+
+export default React.memo(ChartTooltipBackdrop);
+
+interface UseRenderBackdropParams {
+  seriesNum: number;
+  transitionDuration: number | null;
+}
+
+export function useRenderBackdrop(ref: React.RefObject<SVGGElement>, { seriesNum, transitionDuration }: UseRenderBackdropParams) {
+  return React.useCallback((width: number, isIncompleteData: boolean) => {
+    const height = calculateContainerHeight(seriesNum, isIncompleteData);
+
+    if (transitionDuration) {
+      d3.select(ref.current)
+        .select('.ChartTooltip__backdrop')
+        .transition()
+        .duration(transitionDuration)
+        .ease(d3.easeLinear)
+        .attr('width', width)
+        .attr('height', height);
+    } else {
+      d3.select(ref.current)
+        .select('.ChartTooltip__backdrop')
+        .attr('width', width)
+        .attr('height', height);
+    }
+  }, [ ref, seriesNum, transitionDuration ]);
+}

ui/shared/chart/utils/computeTooltipPosition.ts → ui/shared/chart/tooltip/ChartTooltipContent.tsx

+import * as d3 from 'd3';
 import _clamp from 'lodash/clamp';
+import React from 'react';
 
-interface Params {
+import { POINT_SIZE } from './utils';
+
+interface Props {
+  children: React.ReactNode;
+}
+
+const ChartTooltipContent = ({ children }: Props) => {
+  return <g className="ChartTooltip__content">{ children }</g>;
+};
+
+export default React.memo(ChartTooltipContent);
+
+interface UseRenderContentParams {
+  chart: {
+    width?: number;
+    height?: number;
+  };
+  transitionDuration: number | null;
+}
+
+export function useRenderContent(ref: React.RefObject<SVGGElement>, { chart, transitionDuration }: UseRenderContentParams) {
+  return React.useCallback((x: number, y: number) => {
+    const tooltipContent = d3.select(ref.current).select('.ChartTooltip__content');
+
+    const transformAttributeFn: d3.ValueFn<d3.BaseType, unknown, string> = (cur, i, nodes) => {
+      const node = nodes[i] as SVGGElement | null;
+      const { width: nodeWidth, height: nodeHeight } = node?.getBoundingClientRect() || { width: 0, height: 0 };
+      const [ translateX, translateY ] = calculatePosition({
+        canvasWidth: chart.width || 0,
+        canvasHeight: chart.height || 0,
+        nodeWidth,
+        nodeHeight,
+        pointX: x,
+        pointY: y,
+        offset: POINT_SIZE,
+      });
+      return `translate(${ translateX }, ${ translateY })`;
+    };
+
+    if (transitionDuration) {
+      tooltipContent
+        .transition()
+        .duration(transitionDuration)
+        .ease(d3.easeLinear)
+        .attr('transform', transformAttributeFn);
+    } else {
+      tooltipContent
+        .attr('transform', transformAttributeFn);
+    }
+
+  }, [ chart.height, chart.width, ref, transitionDuration ]);
+}
+
+interface CalculatePositionParams {
   pointX: number;
   pointY: number;
   offset: number;
@@ -10,7 +65,7 @@ interface Params {
   canvasHeight: number;
 }
 
-export default function computeTooltipPosition({ pointX, pointY, canvasWidth, canvasHeight, nodeWidth, nodeHeight, offset }: Params): [ number, number ] {
+function calculatePosition({ pointX, pointY, canvasWidth, canvasHeight, nodeWidth, nodeHeight, offset }: CalculatePositionParams): [ number, number ] {
   // right
   if (pointX + offset + nodeWidth <= canvasWidth) {
     const x = pointX + offset;

ui/shared/chart/tooltip/ChartTooltipLine.tsx

+import { useToken } from '@chakra-ui/react';
+import * as d3 from 'd3';
+import React from 'react';
+
+const ChartTooltipLine = () => {
+  const lineColor = useToken('colors', 'gray.400');
+  return <line className="ChartTooltip__line" stroke={ lineColor } strokeDasharray="3"/>;
+};
+
+export default React.memo(ChartTooltipLine);
+
+export function useRenderLine(ref: React.RefObject<SVGGElement>, chartHeight: number | undefined) {
+  return React.useCallback((x: number) => {
+    d3.select(ref.current)
+      .select('.ChartTooltip__line')
+      .attr('x1', x)
+      .attr('x2', x)
+      .attr('y1', 0)
+      .attr('y2', chartHeight || 0);
+  }, [ ref, chartHeight ]);
+}

ui/shared/chart/tooltip/ChartTooltipPoint.tsx

+import { useColorModeValue, useToken } from '@chakra-ui/react';
+import * as d3 from 'd3';
+import React from 'react';
+
+import type { TimeChartData, TimeChartItem } from 'ui/shared/chart/types';
+
+import { POINT_SIZE } from './utils';
+
+const ChartTooltipPoint = () => {
+  const bgColor = useToken('colors', useColorModeValue('black', 'white'));
+  const borderColor = useToken('colors', useColorModeValue('white', 'black'));
+
+  return (
+    <circle
+      className="ChartTooltip__point"
+      r={ POINT_SIZE / 2 }
+      opacity={ 1 }
+      fill={ bgColor }
+      stroke={ borderColor }
+      strokeWidth={ 4 }
+    />
+  );
+};
+
+export default React.memo(ChartTooltipPoint);
+
+interface UseRenderPointsParams {
+  data: TimeChartData;
+  xScale: d3.ScaleTime<number, number>;
+  yScale: d3.ScaleLinear<number, number>;
+}
+
+export interface CurrentPoint {
+  datumIndex: number;
+  item: TimeChartItem;
+}
+
+interface RenderPointsReturnType{
+  x: number;
+  y: number;
+  currentPoints: Array<CurrentPoint>;
+}
+
+export function useRenderPoints(ref: React.RefObject<SVGGElement>, params: UseRenderPointsParams) {
+  return React.useCallback((x: number): RenderPointsReturnType => {
+    const xDate = params.xScale.invert(x);
+    const bisectDate = d3.bisector<TimeChartItem, unknown>((d) => d.date).left;
+    let baseXPos = 0;
+    let baseYPos = 0;
+    const currentPoints: Array<CurrentPoint> = [];
+
+    d3.select(ref.current)
+      .selectAll('.ChartTooltip__point')
+      .attr('transform', (cur, elementIndex) => {
+        const datum = params.data[elementIndex];
+        const index = bisectDate(datum.items, xDate, 1);
+        const d0 = datum.items[index - 1] as TimeChartItem | undefined;
+        const d1 = datum.items[index] as TimeChartItem | undefined;
+        const d = (() => {
+          if (!d0) {
+            return d1;
+          }
+          if (!d1) {
+            return d0;
+          }
+          return xDate.getTime() - d0.date.getTime() > d1.date.getTime() - xDate.getTime() ? d1 : d0;
+        })();
+
+        if (d?.date === undefined && d?.value === undefined) {
+          // move point out of container
+          return 'translate(-100,-100)';
+        }
+
+        const xPos = params.xScale(d.date);
+        const yPos = params.yScale(d.value);
+
+        if (elementIndex === 0) {
+          baseXPos = xPos;
+          baseYPos = yPos;
+        }
+
+        currentPoints.push({ item: d, datumIndex: elementIndex });
+
+        return `translate(${ xPos }, ${ yPos })`;
+      });
+
+    return {
+      x: baseXPos,
+      y: baseYPos,
+      currentPoints,
+    };
+  }, [ ref, params ]);
+}

ui/shared/chart/tooltip/ChartTooltipRow.tsx

+import { useToken } from '@chakra-ui/react';
+import * as d3 from 'd3';
+import React from 'react';
+
+import type { TimeChartData } from '../types';
+
+import type { CurrentPoint } from './ChartTooltipPoint';
+import { calculateRowTransformValue, LABEL_WIDTH, PADDING } from './utils';
+
+type Props = {
+  lineNum: number;
+} & ({ label: string; children?: never } | { children: React.ReactNode; label?: never })
+
+const ChartTooltipRow = ({ label, lineNum, children }: Props) => {
+  const labelColor = useToken('colors', 'blue.100');
+  const textColor = useToken('colors', 'white');
+
+  return (
+    <g className="ChartTooltip__row" transform={ calculateRowTransformValue(lineNum) }>
+      { children || (
+        <>
+          <text
+            className="ChartTooltip__label"
+            transform="translate(0,0)"
+            dominantBaseline="hanging"
+            fill={ labelColor }
+          >
+            { label }
+          </text>
+          <text
+            className="ChartTooltip__value"
+            transform={ `translate(${ LABEL_WIDTH },0)` }
+            dominantBaseline="hanging"
+            fill={ textColor }
+          />
+        </>
+      ) }
+    </g>
+  );
+};
+
+export default React.memo(ChartTooltipRow);
+
+interface UseRenderRowsParams {
+  data: TimeChartData;
+  xScale: d3.ScaleTime<number, number>;
+  minWidth: number;
+}
+
+interface UseRenderRowsReturnType {
+  width: number;
+}
+
+export function useRenderRows(ref: React.RefObject<SVGGElement>, { data, xScale, minWidth }: UseRenderRowsParams) {
+  return React.useCallback((x: number, currentPoints: Array<CurrentPoint>): UseRenderRowsReturnType => {
+
+    // update "transform" prop of all rows
+    const isIncompleteData = currentPoints.some(({ item }) => item.isApproximate);
+    d3.select(ref.current)
+      .selectAll<Element, TimeChartData>('.ChartTooltip__row')
+      .attr('transform', (datum, index) => {
+        return calculateRowTransformValue(index - (isIncompleteData ? 0 : 1));
+      });
+
+    // update date and indicators value
+    // here we assume that the first value element contains the date
+    const valueNodes = d3.select(ref.current)
+      .selectAll<Element, TimeChartData>('.ChartTooltip__value')
+      .text((_, index) => {
+        if (index === 0) {
+          const date = xScale.invert(x);
+          const dateValue = data[0].items.find((item) => item.date.getTime() === date.getTime())?.dateLabel;
+          const dateValueFallback = d3.timeFormat('%e %b %Y')(xScale.invert(x));
+          return dateValue || dateValueFallback;
+        }
+
+        const { datumIndex, item } = currentPoints.find(({ datumIndex }) => datumIndex === index - 1) || {};
+        if (datumIndex === undefined || !item) {
+          return null;
+        }
+
+        const value = data[datumIndex]?.valueFormatter?.(item.value) ?? item.value.toLocaleString(undefined, { minimumSignificantDigits: 1 });
+        const units = data[datumIndex]?.units ? ` ${ data[datumIndex]?.units }` : '';
+
+        return value + units;
+      })
+      .nodes();
+
+    const valueWidths = valueNodes.map((node) => node?.getBoundingClientRect?.().width);
+    const maxValueWidth = Math.max(...valueWidths);
+    const maxRowWidth = Math.max(minWidth, 2 * PADDING + LABEL_WIDTH + maxValueWidth);
+
+    return { width: maxRowWidth };
+
+  }, [ data, minWidth, ref, xScale ]);
+}

ui/shared/chart/tooltip/ChartTooltipTitle.tsx

+import { useToken } from '@chakra-ui/react';
+import * as d3 from 'd3';
+import React from 'react';
+
+import ChartTooltipRow from './ChartTooltipRow';
+
+const ChartTooltipTitle = () => {
+  const titleColor = useToken('colors', 'yellow.300');
+
+  return (
+    <ChartTooltipRow lineNum={ 0 }>
+      <text
+        className="ChartTooltip__title"
+        transform="translate(0,0)"
+        fill={ titleColor }
+        opacity={ 0 }
+        dominantBaseline="hanging"
+      >
+        Incomplete day
+      </text>
+    </ChartTooltipRow>
+  );
+};
+
+export default React.memo(ChartTooltipTitle);
+
+export function useRenderTitle(ref: React.RefObject<SVGGElement>) {
+  return React.useCallback((isVisible: boolean) => {
+    d3.select(ref.current)
+      .select('.ChartTooltip__title')
+      .attr('opacity', isVisible ? 1 : 0);
+  }, [ ref ]);
+}

ui/shared/chart/tooltip/utils.ts

+export const TEXT_LINE_HEIGHT = 12;
+export const PADDING = 16;
+export const LINE_SPACE = 10;
+export const POINT_SIZE = 16;
+export const LABEL_WIDTH = 80;
+
+export const calculateContainerHeight = (seriesNum: number, isIncomplete?: boolean) => {
+  const linesNum = isIncomplete ? seriesNum + 2 : seriesNum + 1;
+
+  return 2 * PADDING + linesNum * TEXT_LINE_HEIGHT + (linesNum - 1) * LINE_SPACE;
+};
+
+export const calculateRowTransformValue = (rowNum: number) => {
+  const top = Math.max(0, PADDING + rowNum * (LINE_SPACE + TEXT_LINE_HEIGHT));
+  return `translate(${ PADDING },${ top })`;
+};

ui/shared/chart/types.tsx

@@ -8,6 +8,7 @@ export interface TimeChartItem {
   date: Date;
   dateLabel?: string;
   value: number;
+  isApproximate?: boolean;
 }
 
 export interface ChartMargin {

ui/shared/chart/utils/animations.ts

+import * as d3 from 'd3';
+
+export type AnimationType = 'left' | 'fadeIn' | 'none';
+
+export const animateLeft = (path: SVGPathElement) => {
+  const totalLength = path.getTotalLength() || 0;
+  d3.select(path)
+    .attr('opacity', 1)
+    .attr('stroke-dasharray', `${ totalLength },${ totalLength }`)
+    .attr('stroke-dashoffset', totalLength)
+    .transition()
+    .duration(750)
+    .ease(d3.easeLinear)
+    .attr('stroke-dashoffset', 0);
+};
+
+export const animateFadeIn = (path: SVGPathElement) => {
+  d3.select(path)
+    .transition()
+    .duration(750)
+    .ease(d3.easeLinear)
+    .attr('opacity', 1);
+};
+
+export const noneAnimation = (path: SVGPathElement) => {
+  d3.select(path).attr('opacity', 1);
+};
+
+export const ANIMATIONS: Record<AnimationType, (path: SVGPathElement) => void> = {
+  left: animateLeft,
+  fadeIn: animateFadeIn,
+  none: noneAnimation,
+};

ui/shared/chart/utils/formatters.ts

+import type { TimeChartItem } from '../types';
+
+export const getIncompleteDataLineSource = (data: Array<TimeChartItem>): Array<TimeChartItem> => {
+  const result: Array<TimeChartItem> = [];
+
+  for (let index = 0; index < data.length; index++) {
+    const current = data[index];
+    if (current.isApproximate) {
+      const prev = data[index - 1];
+      const next = data[index + 1];
+
+      prev && !prev.isApproximate && result.push(prev);
+      result.push(current);
+      next && !next.isApproximate && result.push(next);
+    }
+  }
+
+  return result;
+};

ui/stats/ChartWidgetContainer.tsx

@@ -42,7 +42,7 @@ const ChartWidgetContainer = ({ id, title, description, interval, onLoadingError
   });
 
   const items = useMemo(() => data?.chart?.map((item) => {
-    return { date: new Date(item.date), value: Number(item.value) };
+    return { date: new Date(item.date), value: Number(item.value), isApproximate: item.is_approximate };
   }), [ data ]);
 
   useEffect(() => {