I have a set of ~100 pictograms that I use for personal notation. When I was actively working on Zeta. I created a few of these with equations:
You can read more about Zeta in this post.
I spam my facebook with images from my sketchbooks if you’re at all interested in seeing more pictograms:
Creating a dictionary type object with ES6 Symbols is easy. Yes we have Maps and WeakMaps but this is still interesting for a variety of reasons… Being able to use objects as keys in another object (dictionary) has many great uses…. So how do you use Symbols like this?
1 2 3 4 5 6 7 8 9 10 11 12 13 14 | let a = { id: Symbol('key') }, b = { id: Symbol('key') }; let dictionary = { [a.id]: 'value by obj a', [b.id]: 'value by obj b' }; console.log(dictionary[a.id]); console.log(dictionary[b.id]); // outputs: // 'value by obj a' // 'value by obj b' |
By using either object a or object b’s `id` symbol, our dictionary points to another value. This old AS3 snippet is similar:
In 2015 I created QuickShader… which just takes the boilerplate out of showing a shader in the browser. Here are a few examples:
Being able to draw smooth lines that connect arbitrary points is something that I find myself needing very frequently. This is a port of an old snippet that does just that. By averaging control points of a quadratic bezier curve we ensure that our resulting Bezier curves are always smooth.
The key can be seen here with the `bezierSkin` function. It draws either a closed or open curve.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 | // array of xy coords, closed boolean function bezierSkin(bez, closed = true) { var avg = calcAvgs(bez), leng = bez.length, i, n; if (closed) { c.moveTo(avg[0], avg[1]); for (i = 2; i < leng; i += 2) { n = i + 1; c.quadraticCurveTo(bez[i], bez[n], avg[i], avg[n]); } c.quadraticCurveTo(bez[0], bez[1], avg[0], avg[1]); } else { c.moveTo(bez[0], bez[1]); c.lineTo(avg[0], avg[1]); for (i = 2; i < leng - 2; i += 2) { n = i + 1; c.quadraticCurveTo(bez[i], bez[n], avg[i], avg[n]); } c.lineTo(bez[leng - 2], bez[leng - 1]); } } // create anchor points by averaging the control points function calcAvgs(p) { var avg = [], leng = p.length, prev; for (var i = 2; i < leng; i++) { prev = i - 2; avg.push((p[prev] + p[i]) / 2); } // close avg.push((p[0] + p[leng - 2]) / 2); avg.push((p[1] + p[leng - 1]) / 2); return avg; } |
The control points are then averaged to ensure that the curve contains no sharp angles.