Lai Yi Ohlsen

@laiyi-ohlsen·5 public vizzes

Mouse Follower

A yellow circle follows the mouse cursor across a full-screen SVG canvas, using React state to track and render its position. The app listens for `mousemove` events on the SVG element, extracting `clientX` and `clientY` coordinates via `useCallback` and updating the circle’s `cx` and `cy` attributes through `useState` and `ReactDOM.render`. This demonstrates a simple interactive pattern with React’s declarative rendering and SVG’s coordinate system.

Dec 23, 2023

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Loading and Parsing CSV Data

This example demonstrates the initial step of fetching a remote CSV file from a GitHub gist containing CSS named colors, printing its raw text content to the browser console. The code uses the `fetch` API with asynchronous `async`/`await` syntax to retrieve the text, then calls `console.log()` on the result. It does not parse the CSV into a data structure or render any visualization; it solely verifies that the text data loads successfully.

Dec 23, 2023

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Fork of Loading and Parsing CSV Data

This example demonstrates how to load and parse CSV data in a React-friendly environment using D3 v5. It fetches a remote dataset of CSS named colors via `d3.csv` and displays summary statistics—file size in kilobytes, row count, and column count—in a large HTML `<pre>` element. The code also includes commented alternatives using `fetch` with async/await and `d3.csvParse` for comparison. The visualization is text-based, showing raw data metrics rather than graphical rendering, and highlights both direct CSV parsing and manual text fetching approaches.

Dec 23, 2023

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Fork of Let's Make a Face Part I

A grid of eighteen yellow smiley faces, each with black outlines, eyes, and a curved mouth, is rendered as SVG. The faces are generated in React and D3 v7, using `arc()` from D3 to create the mouth shapes and `range()` to produce the array of components. Random eye radii vary the faces.

Dec 23, 2023

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Fork of Smiley Face Part III

This example shows a simple smiley face built from basic SVG shapes, with a yellow circle for the head, two black eyes, and an arc-shaped mouth. The face is centered on a 960 by 500 canvas, with all shapes positioned relative to the center using SVG group transformations. The code uses React to render the SVG elements and D3’s `arc` function to generate the mouth path from inner and outer radii and start and end angles. The head and eyes are drawn as plain SVG circles with explicit stroke and fill attributes.

Dec 23, 2023