Hwl98

@Hwl98·5 public vizzes

Let's make a map with D3.js!

This example displays a world map rendered with SVG paths, using D3.js v5 and TopoJSON. It loads geographic country boundaries from the world-atlas dataset and projects them with a Mercator projection. The code uses `d3.geoPath` and `d3.geoMercator` to generate the map, while `topojson.feature` converts the TopoJSON data into GeoJSON features. Countries appear filled in steel blue with black, semi-transparent borders, demonstrating a minimal choropleth-style base map.

Apr 22, 2020

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Cheap Tricks for Interaction On a D3.js World Map!

This example shows a world map rendered with SVG paths from TopoJSON data, where hovering over a country highlights it in red and a built-in zoom interaction transforms the entire map group. The visualization loads country boundaries from the world-atlas package, joins them with names from a TSV file, and uses d3.geoMercator with d3.geoPath for projection and rendering. It implements zoom via d3.zoom, applies tooltips through SVG title elements, and uses CSS :hover rules to change fill colors on mouseover.

Apr 21, 2020

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Cars Scatter Plot with D3.js

This example visualizes the relationship between horsepower and weight for a dataset of cars, with each vehicle represented by a semi-transparent red circle. The code uses D3.js v5's `csv` method to load data from a remote file, `scaleLinear` to map data values to pixel coordinates, and `axisBottom` and `axisLeft` to render axes with grid lines. The scatter plot is drawn as an SVG, and the chart includes labeled axes and a title, with margins and padding handled manually.

Apr 20, 2020

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Migrant Deaths Linked Views with Brushing

This interactive visualization combines a world bubble map with a time-series histogram to explore migrant deaths and disappearances. Users can brush a time range in the histogram to filter which incidents appear on the map, linking the two views. The map uses a natural Earth projection via `d3.geoPath`, with circle radii scaled by the square root of the death count. The histogram aggregates monthly totals using `d3.bin`, and brushing is implemented with `d3.brushX`. Data comes from the Missing Migrants Project CSV, rendered with React and SVG.

Apr 20, 2020

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Let's make a face with D3.js!

A D3.js v5 example creates a smiley face in an SVG, animating its eyebrows through a sequence of transitions. The face is built with a yellow circle for the head, two circles for eyes, and a crescent-shaped path for a mouth, all grouped and transformed to center on the canvas. Eyebrows, rendered as rectangles, move up and down over two-second durations using the `transition` API, demonstrating fundamental DOM manipulation with `select` and `append` methods.

Apr 17, 2020