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Developer tools · #p5js
Transitioning to ES Modules With the release of p5.js 2.0, the library now provides ES module entry points alongside traditional UMD builds. This allows developers to use import { p5 } from 'p5' in modular environments like Vite or Webpack, whereas global mode typically relies on the UMD script tag to populate the window object. Module Boundary Constraints I
Goal: run multiple independent p5.js sketches on a single HTML page without variable name collisions or shared canvas interference. In p5.js 1.x, global mode attaches sketch logic to the window object, which is convenient for one sketch but risks collisions when several sketches share a page. Instance mode wraps each sketch in a function that receives a p5 o
p5.js loadImage() ↔ Browser Image Loading When an image is requested with loadImage() , p5.js internally creates an HTMLImageElement and attaches onload and onerror callbacks. The library offers a timeout argument, but this merely stops the callback from firing after a set period; it does not abort the underlying network request or clear the image source. No
Decision Context When building a medium‑size interactive visualization that will share a page with other scripts and may rely on external add‑ons that expect p5 globals, the developer must choose between p5.js’s global mode and instance mode. Global mode offers direct access to functions like createCanvas and loadImage without wrapping, but it places those i
loadImage silent failure when sketch served from subpath Goal: guarantee that loadImage , loadSound and similar preload calls resolve assets correctly whether the sketch runs on a local dev server or on a production host that serves the page from a subpath or with a different base href . Constraints: p5.js resolves asset URLs relative to the HTML document’s
When a p5.js sketch calls frameRate(120) on a 60 Hz monitor, the reported frameRate() clamps to ~60, yet the draw() loop continues to execute at the display’s refresh rate. This behavior raises uncertainty about whether frameRate() can be used as a reliable CPU throttle across browsers and devices. The goal is to determine if setting a target FPS actually li
DOM Overhead During Dynamic Canvas Re-initialization In p5.js global mode, the createCanvas() function initializes a renderer and attaches a canvas element to the HTML document body. When a sketch requires a dynamic change in resolution or a complete reset of the graphics context, calling createCanvas() again is a common approach to re-initialize the drawing
Transformation State Management In p5.js, the translate() function shifts the origin of the coordinate system. Because transformations are cumulative, each call to translate() moves the origin relative to its previous position rather than the absolute canvas top-left (0,0). When rendering complex scenes with multiple moving elements, failing to isolate these
Symptom A p5.js sketch renders correctly in the browser, but when navigating the page with a keyboard and a screen reader (NVDA or VoiceOver), the canvas produced by createCanvas() is skipped entirely. It receives no focus and no accessible name is announced, so assistive technology users have no indication that interactive content exists on the page. Contex