{"id":16007,"library":"drawille-canvas-blessed-contrib","title":"drawille-canvas HTML5 Canvas API for Terminal","description":"The `drawille-canvas` package provides an implementation of a subset of the HTML5 Canvas 2D API, specifically designed for rendering graphics within a terminal environment. It achieves this by utilizing Unicode braille characters through the underlying `drawille` library. Currently at version `0.1.3`, the project appears to be in an early, unmaintained, or abandoned state. The README explicitly notes improved performance on Node.js `v0.11` compared to `v0.10`, which are extremely old Node.js runtime versions, indicating the package was developed for historical environments. There is no clear release cadence, and active development for modern Node.js environments is highly improbable. Its primary value proposition was offering a familiar imperative Canvas-like drawing API for text-based interfaces.","status":"abandoned","version":"0.1.3","language":"javascript","source_language":"en","source_url":"git://github.com/madbence/node-drawille-canvas","tags":["javascript","drawille","canvas"],"install":[{"cmd":"npm install drawille-canvas-blessed-contrib","lang":"bash","label":"npm"},{"cmd":"yarn add drawille-canvas-blessed-contrib","lang":"bash","label":"yarn"},{"cmd":"pnpm add drawille-canvas-blessed-contrib","lang":"bash","label":"pnpm"}],"dependencies":[{"reason":"Core dependency for braille character rendering in the terminal.","package":"drawille","optional":false}],"imports":[{"note":"This package primarily supports CommonJS (`require`) syntax due to its age. Direct ES Module (`import`) usage is unlikely to work without a CommonJS wrapper or bundler.","wrong":"import { Canvas } from 'drawille-canvas';\nimport Canvas from 'drawille-canvas';\nconst { Canvas } = require('drawille-canvas');","symbol":"Canvas","correct":"const Canvas = require('drawille-canvas');"}],"quickstart":{"code":"const Canvas = require('drawille-canvas');\n\nconst width = 80;\nconst height = 20;\nconst canvas = new Canvas(width, height);\nconst ctx = canvas; // CanvasRenderingContext2D methods are directly on the canvas object\n\n// Draw a rectangle\nctx.fillRect(0, 0, 10, 5);\n\n// Draw a line\nctx.beginPath();\nctx.moveTo(15, 2);\nctx.lineTo(25, 10);\nctx.stroke();\n\n// Clear a portion\nctx.clearRect(2, 2, 3, 3);\n\n// Translate and draw another rectangle\nctx.save();\nctx.translate(30, 5);\nctx.rotate(Math.PI / 4); // Rotate by 45 degrees\nctx.fillRect(0, 0, 8, 4);\nctx.restore();\n\n// Draw something more complex to fill the space\nfor (let i = 0; i < 10; i++) {\n  ctx.beginPath();\n  ctx.moveTo(width - 1 - i * 3, 0);\n  ctx.lineTo(width - 1 - i * 3, height - 1);\n  ctx.stroke();\n}\n\n// Output the generated braille frame to the console\nconsole.log(canvas.frame());","lang":"javascript","description":"Illustrates how to initialize a Canvas, draw basic shapes like rectangles and lines, clear areas, apply transformations (translate, rotate), and output the braille-rendered frame to the console."},"warnings":[{"fix":"Consider using alternative, actively maintained terminal UI/graphics libraries for modern Node.js projects, or a carefully isolated environment with an older Node.js version if legacy code must be run.","message":"The package was developed for very old Node.js versions (v0.10/v0.11). Compatibility and performance with modern Node.js runtimes (v12+) are not guaranteed and may lead to unexpected errors or degraded performance.","severity":"gotcha","affected_versions":"All versions"},{"fix":"Review the API documentation thoroughly before relying on specific Canvas 2D context methods. For missing functionality, custom workarounds using existing primitives or a different library would be necessary.","message":"The Canvas API implementation is incomplete, notably missing crucial methods such as `fill()`, `arc()`, and `arcTo()`. This limits the complexity of graphics that can be easily rendered.","severity":"gotcha","affected_versions":"All versions"},{"fix":"Evaluate the necessity of this specific library. If terminal graphics are essential, explore more current and actively maintained alternatives in the Node.js ecosystem.","message":"As an abandoned project (version 0.1.3), it is highly unlikely to receive bug fixes, security updates, or new features. Relying on it for production systems introduces maintenance risks.","severity":"gotcha","affected_versions":"All versions"},{"fix":"Test the output extensively in the target terminal environment. Ensure the terminal supports Unicode braille characters and that a suitable font is configured.","message":"The output relies on braille characters, which might not render correctly across all terminal emulators or fonts, leading to inconsistent visual results.","severity":"gotcha","affected_versions":"All versions"}],"env_vars":null,"last_verified":"2026-04-21T00:00:00.000Z","next_check":"2026-07-20T00:00:00.000Z","problems":[{"fix":"Use `const Canvas = require('drawille-canvas');` to correctly import the module.","cause":"Attempting to import `Canvas` using ES Module syntax (`import`) or incorrect CommonJS destructuring, instead of the expected CommonJS default export.","error":"TypeError: Canvas is not a constructor"},{"fix":"Ensure `const canvas = new Canvas(width, height);` has been called successfully, and methods are called on the `canvas` object (or a context derived from it if applicable, though for this library it's directly on `canvas`).","cause":"This error occurs when attempting to call a method like `fillRect` on a variable that is not an initialized `Canvas` instance, often due to an incorrect import or instantiation.","error":"TypeError: Cannot read properties of undefined (reading 'fillRect')"},{"fix":"Install the dependency explicitly: `npm install drawille`.","cause":"The required `drawille` package, which is a peer or direct dependency, is not installed in the project.","error":"Error: Cannot find module 'drawille'"}],"ecosystem":"npm"}