✅ – Nesho – 10-41 Feb 25

Hello, I'm using d3 to render charts. I have a problem with generating an area with d3.area, the area is being generated outside of my svg size, even though I'm giving the y-scale the same size as my svg. Any ideas? 
export function useD3Scales<T>({ data, xKey, yKey }: Options<T>) {
  const { width, height, margin } = useResponsiveContainerSize();

  const xScale = d3
    .scaleTime()
    .domain(
      d3.extent(data, (d, i) => {
        return xKey ? xKey(d) : i;
      })
    )
    .range([margin.left, width - margin.right]);

  const yScale = d3
    .scaleLinear()
    .domain(d3.extent(data, (d) => d[yKey]))
    .range([height - margin.bottom, margin.top]);

  return { xScale, yScale };
}
export function useD3Scales<T>({ data, xKey, yKey }: Options<T>) {
  const { width, height, margin } = useResponsiveContainerSize();

  const xScale = d3
    .scaleTime()
    .domain(
      d3.extent(data, (d, i) => {
        return xKey ? xKey(d) : i;
      })
    )
    .range([margin.left, width - margin.right]);

  const yScale = d3
    .scaleLinear()
    .domain(d3.extent(data, (d) => d[yKey]))
    .range([height - margin.bottom, margin.top]);

  return { xScale, yScale };
}
N
Nesho•425d ago
The area component 
export function Area<T>({
  color = 'blue',
  data,
  dataKey,
  line = true,
  ...rest
}: AreaProps<T>) {
  const { xScale, yScale } = useD3Scales({
    data,
    yKey: dataKey,
  });
  const { theme } = useTheme();

  console.log(yScale.range());

  const areaGenerator = useMemo(() => {
    return d3
      .area<T>()
      .x((_, i) => xScale(i))
      .y0(yScale(0))
      .y1((d) => yScale(d[dataKey]));
  }, [yScale, xScale]);

  const area = useMemo(() => areaGenerator(data), [areaGenerator]);
  const colorScheme = theme.colors[color][5];

  return (
    <>
      {line && <Line data={data} dataKey={dataKey} color={color} />}
      <path {...rest} fill={colorScheme} fillOpacity={0.1} d={area} />
    </>
  );
}
export function Area<T>({
  color = 'blue',
  data,
  dataKey,
  line = true,
  ...rest
}: AreaProps<T>) {
  const { xScale, yScale } = useD3Scales({
    data,
    yKey: dataKey,
  });
  const { theme } = useTheme();

  console.log(yScale.range());

  const areaGenerator = useMemo(() => {
    return d3
      .area<T>()
      .x((_, i) => xScale(i))
      .y0(yScale(0))
      .y1((d) => yScale(d[dataKey]));
  }, [yScale, xScale]);

  const area = useMemo(() => areaGenerator(data), [areaGenerator]);
  const colorScheme = theme.colors[color][5];

  return (
    <>
      {line && <Line data={data} dataKey={dataKey} color={color} />}
      <path {...rest} fill={colorScheme} fillOpacity={0.1} d={area} />
    </>
  );
}
N
Nesho•425d ago
Result, as you can see, the height of the area is 8781, when it should be 226 (the height of the svg)
N
Nesho•425d ago
The line above, using the same scales
N
Nesho•425d ago
Logging the range gives me [226, 0], which is correct. Solved it. The issue was that I was doing .domain(d3.extent(data, (d) => d[yKey])) in the yScale, when I needed to give it a minimum value of 0 ,and just find the max value .domain([0, d3.max(data, (d) => d[yKey])]). The area calculates and plots correctly now.
UU
Unknown User•424d ago
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