js1k-harness/js1k_entry.js

Tools for developing js1k entries

// This is your js1k entry. This script will be minified and stripped of comments.
// The following variables are available to this script:
//     a: <canvas> 2d drawing context
//     b: document.body
//     c: <canvas> DOM element

var SIZE = 700, velx = 0, vely = 0;
var x = SIZE/2, y = SIZE/2, mass = 50;
c.width = c.height = SIZE;
a.fillStyle = 'rgba(200,200,250,0.2)';
a.strokeStyle = 'rgba(0,0,200,1)';

setInterval(function() {
    force_x = Math.random()*100 - 50;
    force_y = Math.random()*100 - 50;

    velx += force_x/mass;
    vely += force_y/mass;

    x = x+ velx*0.4
    y = y+ vely*0.4

    a.fillRect(x, y, 100, 100);
    a.strokeRect(x, y, 100, 100);
}, 200);