README.md

canvas-pack

A creative-coding environment for JavaScript. Allows you to use npm packages in your creative-coding sketches. Will automatically reload the page as soon as you make changes to your code.

Usage

1. Install canvas pack in your project (npm install --save canvas-pack).

2. Create index.js in root directory:

   import createRegl from "regl";
   
   const canvas = document.getElementById("canvas");
   
   const regl = createRegl(canvas);
   
   const drawTriangle = regl({
     frag: `
      precision mediump float;
      uniform vec4 color;
      void main() {
         gl_FragColor = color;
      }`,
   
     vert: `
      precision mediump float;
      attribute vec2 position;
      void main() {
         gl_Position = vec4(position, 0, 1);
      }`,
   
     attributes: {
       position: regl.buffer([
         [-0.9, -0.9],
         [0.9, -0.9],
         [0.9, 0.9],
       ]),
     },
   
     uniforms: {
       color: regl.prop("color"),
     },
   
     count: 3,
   });
   
   regl.frame(({ time, tick }) => {
     regl.clear({
       color: [0, 0, 0, 0],
       depth: 1,
     });
   
     drawTriangle({
       color: [
         Math.cos(time * 0.1),
         Math.sin(time * 0.08),
         Math.cos(time * 0.3),
         1,
       ],
     });
   });

3. Add start script to package.json:

   {
     // ...
     "scripts": {
       "start": "canvas-pack"
     }
     // ...
   }

4. Run npm start.

5. Open browser and navigate to http://localhost:3000/.