React Mouse Follower

Mouse follower

A React application renders a single circle inside an SVG that follows the mouse cursor across the viewport. The component tracks pointer coordinates using a `useState` hook and updates the circle's `cx` and `cy` attributes on every `mousemove` event via a `useCallback` handler. Rendering relies on React 16.9 for state management and SVG creation, with D3 v5 loaded but not actively used for this behavior. The circle starts centered at 480 by 250 pixels and moves smoothly in response to user input.

11tang

Mouse Follower

A circle follows the mouse cursor across an SVG canvas, with React managing its position in real time. The component uses React’s `useState` and `useCallback` hooks to track pointer coordinates from the `onMouseMove` event, updating the circle’s `cx` and `cy` attributes accordingly. The example demonstrates a minimal integration of D3.js (v5) with React, where D3 provides no visual functions—only the SVG rendering is handled by React, and the circle radius is fixed at 30 pixels. The canvas is 960 by 500 pixels, and the initial cursor position starts at the center.

FFrancisco Ortega

MouseFollower

A circle follows the mouse cursor across an SVG canvas in real time. The React component tracks pointer coordinates through the SVG `onMouseMove` event handler, updating the circle’s `cx` and `cy` attributes. Using React hooks like `useState` and `useCallback`, the app re-renders only on cursor movement, while D3 v5 is loaded but unused in this minimal interaction. The initial mouse position is centered at (480, 250) within a 960 by 500 viewport, with the circle’s radius set to 30 pixels.

Aadam

Mouse Follower

A circle follows the mouse cursor as it moves across an SVG canvas. The React component tracks pointer coordinates via the `onMouseMove` event and updates the circle’s `cx` and `cy` attributes through `useState` and `useCallback`. Rendered with D3 v5’s SVG helpers within React 16.9, the example demonstrates real-time state-driven positioning without external data.

Bboreilly26

Mouse Follower

A single SVG circle follows the mouse cursor across a 960 by 500 viewport. The React component uses the `useState` and `useCallback` hooks to track pointer coordinates from the `onMouseMove` event, updating the circle’s `cx` and `cy` attributes with each move. The circle renders with a fixed radius but no fill color, appearing as a black outline on a white background. D3 is loaded but not used in the rendering logic.

BbeauMarko

Mouse Follower

A plain SVG circle follows the user's mouse cursor across a 960-by-500 canvas. The React component tracks `clientX` and `clientY` from a `mousemove` event handler, updating state to reposition the circle's `cx` and `cy` attributes. The example uses React's `useState` and `useCallback` hooks, with D3 v7 loaded for potential supplementary utilities, though rendering relies solely on SVG elements and React's declarative updates.

JJun Suzuki

Mouse Follower

A React-controlled SVG circle follows the mouse cursor across a fixed 960×500 viewport. Mouse coordinates are captured by the SVG’s `onMouseMove` event, processed via a `useCallback` hook, and stored in React state with `useState`. Each movement updates the circle’s `cx` and `cy` attributes, causing a re-render. The example demonstrates direct state-driven SVG updates without D3-specific interaction APIs, relying solely on React’s event handling and DOM reconciliation.

Yyejichun@naver.com

Mouse Follower

A mouse follower example renders a single SVG circle that tracks the cursor's position within a 960 by 500 viewport. Using React state hooks (`useState` and `useCallback`), the component updates the circle's `cx` and `cy` coordinates on every `mousemove` event. D3 version 7 is loaded for potential utilities, though the interaction relies solely on React's event handling and SVG rendering. The circle starts centered and moves fluidly, demonstrating simple interaction between DOM events and React's declarative UI updates.

TTatyana Milanova