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The Margin Convention

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Rrmgoldberg24
Last edited Jan 19, 2023
Created on Jan 19, 2023

This example shows a horizontal bar chart of the top 10 most populous countries in 2020, using the UN Population dataset loaded via `d3.csv`. React state management with `useState` and `useEffect` handles the asynchronous data fetching, while D3’s `scaleBand` and `scaleLinear` map country names and population counts to SVG rectangles. The SVG rendering respects the margin convention by translating a `<g>` element, and the chart appears only after data loads, with a loading message displayed beforehand.

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A program that loads in data using D3 and keeps it in React state as a radial burst!

MIT Licensed

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The Margin Convention

This example demonstrates the margin convention in D3 by rendering a horizontal bar chart of the top 10 most populous countries using 2020 UN population data loaded via `d3.csv`. The chart uses `d3.scaleBand` and `d3.scaleLinear` to map country names and population values to SVG `rect` elements within a translated `<g>` group, with explicit margins separating the inner plot area from the SVG edges. React state and the `useEffect` hook manage asynchronous data loading, while the entire visualization is rendered as SVG inside a React component.

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This example demonstrates the margin convention in D3 by rendering a horizontal bar chart of the top 10 most populous countries from a UN population dataset. The chart uses a React component with D3 scales (`scaleBand`, `scaleLinear`) to position and size SVG rectangles within a translated group element, explicitly reserving space via a margin object. The x-axis encodes population in 2020, while the y-axis displays country names. The code applies D3's `csv` loading and React's `useState` and `useEffect` hooks for data fetching.

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This example displays a horizontal bar chart of the top 10 most populous countries in 2020, drawing from UN population data loaded via D3’s `csv` utility. React renders an SVG with scaled rectangles, using `scaleBand` for country categories and `scaleLinear` for population values, all positioned within a fixed margin using the `transform` attribute. The code relies on D3 v5 and React’s `useEffect` and `useState` hooks, with the chart’s dimensions computed from explicit top, right, bottom, and left margins to define the inner plotting area.

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