Kyle's Mouse Follower

Mouse Follower that Changes Color

A D3.js v7 circle of radius 50 follows the mouse cursor, changing its fill color to a random RGB value each time the user clicks. The visualization demonstrates unidirectional data flow from mouse events through a state object that stores the current x, y, and color coordinates. Built with D3's `select` and `join` APIs, it renders an SVG inside the `#app` container, updating the circle's `cx`, `cy`, and `fill` attributes on every state change.

CCurran Kelleher

Mouse Follower

This example demonstrates a mouse-following circle that changes position with cursor movement and shifts to a random color on click. The visualization starts with a blue circle centered in the viewport, then uses d3’s `select`, `pointer`, and `join` methods to render an SVG and update its attributes. State changes follow immutable update patterns, spreading the previous state and overriding specific properties like `x`, `y`, and `color`. The code also relies on container dimensions and event listeners for `mousemove` and `click` interactions.

CCurran Kelleher

Mouse Follower

A circle follows the mouse pointer across the screen, updating its position in real time based on cursor movement. The visualization demonstrates unidirectional data flow with D3 v7 and React, where mouse events trigger state updates that re-render the circle’s coordinates. The code uses d3-selection `select` and `join` to bind SVG elements, with an initial state centered in the viewport. The React framework manages state through a `setState` callback, while the D3 `mousemove` event handler captures pointer positions.

CCurran Kelleher

Mouse Follower

A single black circle follows the cursor across a full-screen SVG canvas, updating its position in real time. The visualization demonstrates a minimal state-driven D3 render loop, where a `mousemove` event listener calls a `setState` function to update the pointer coordinates. The `viz` function uses a data join to create and update the circle element, with `d3.select` handling the SVG selection and attribute updates for the x and y positions. The example relies on D3 v7 and a custom render pattern that re-renders the entire visualization on each state change.

MMinwoo Pak

Mouse Follower

A circle tracks the cursor across a full-screen SVG canvas. Each mouse movement updates the circle’s center coordinates via a state object and a custom `setState` callback. The visualization uses d3.v7’s `select` API to bind SVG elements and handle `mousemove` events, while `join` synchronizes the circle’s `cx` and `cy` attributes. The canvas resizes to the browser window dimensions.

Jjjlaber

mouse follower

This example shows a single green circle that follows the mouse pointer across an SVG canvas. Moving the mouse updates the circle’s position via `d3.pointer` and state management, while clicking changes its fill color to a random hex value. The code uses D3 v7, with `select`, `pointer`, and data joins to bind the circle’s coordinates and radius. The visualization demonstrates reactive updates through a `setState` callback, with the circle rendered at half opacity.

DDonald Bagwell

Mouse Follower

A black circle follows the mouse cursor across a green SVG canvas, responding instantly to pointer movement. The visualization uses React’s `useState` and `useCallback` hooks to track the mouse position and update the circle’s `cx` and `cy` attributes. The SVG element’s `onMouseMove` event handler captures the cursor coordinates, while D3’s `arc` module is imported but unused. The example demonstrates a simple interactive pattern combining React state management with SVG rendering.

TTyler Durham

Mouse Follower That Changes Color

A circle follows the mouse cursor across a full-screen SVG canvas, changing its fill color to a random RGB value on each click. The visualization demonstrates unidirectional data flow with a state object managed by `setState`, while D3 v7 selections and the `join` pattern handle SVG rendering. Mouse position events trigger state updates through `svg.on('mousemove')`, and color changes use `svg.on('click')` with random `rgb()` generation. The example uses d3.select and d3's data join to bind single elements.

Jjjlaber