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The margin convention

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Mmaxthamt
Last edited Mar 13, 2021
Created on Mar 13, 2021

This example demonstrates the D3 margin convention by rendering a horizontal bar chart of the top 10 most populous countries in 2020, using data from the UN Population 2019 dataset. The code uses React state and the `useEffect` hook to load and parse the CSV via `d3.csv`, then applies `scaleBand` and `scaleLinear` for layout. It shows how to apply margins by translating an SVG `<g>` group with `margin.top` and `margin.left`, drawing gridlines from `xScale.ticks()` and styled `<rect>` elements for each bar. Rendering relies on React’s virtual DOM and SVG output.

AI-generated description

A program that uses React to render some data about CSS named colors using D3 utilities and uses React state to keep track of the data.

MIT Licensed

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The margin convention

This example demonstrates D3’s margin convention by rendering a horizontal bar chart of UN population data for the top ten countries in 2020. The chart uses React state to load the CSV via `d3.csv` and maps each country to a `<rect>` inside a translated `<g>` element, with scales from `d3.scaleBand` and `d3.scaleLinear`. All marks are drawn as SVG within a fixed 960×500 viewport, clearly separating the plotting area from the surrounding margins.

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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 (2020 estimates). The code uses D3’s `csv` loader, `scaleBand`, and `scaleLinear` to position and size the bars within an inner plotting area defined by explicit margins, while React’s `useState` and `useEffect` manage data fetching and component state. All SVG elements are generated declaratively through React, with the root group translated by the margin values to align the chart inside the fixed 960×500 viewport.

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