(Literally) Drawing the HTML 5 Logo in Canvas with Javascript | Hacker News Reader

(Literally) Drawing the HTML 5 Logo in Canvas with Javascript

richwchan.com

47 pointsrichchan13 comments

I don't understand why people are impressed by HTML Canvas demos. It's like getting impressed by a calculator adding two numbers together. Or being impressed by a for loop statement in a language. Or being impressed by an fopen statement to read files.

A collection of drawRect, drawCircle and setBrushColor calls isn't impressive just because it's done in JS. That's what graphics libraries are supposed to do. Maybe I'm missing something here...

You have (understandably) been led astray by a poorly considered title.

The article demonstrates a vector based 'hand drawing' algorithm that happens to use the HTML5 logo and be implemented in javascript with canvas.

Unfortunately it doesn't appear to implement a generalised library for scruffy drawing.

Click the redraw button a bunch of times while it's still drawing for an interesting effect.

Yep.. Apparently calling jquery ui's disable method doesn't disable the handler -- guess I should've read the docs...

Anyway, thanks for pointing it out. I will try to fix it when I get home. Before then, have fun with the "interesting effects". =)

How did you generate the "var levelX" arrays?

I would love to say that I made a very sophisticated automated tool for this.. but it was mostly just me hacking a simple script that lets me manually select coordinates and preview the lines; while console.log()ing the coordinates and copy-and-pasting into the arrays.

The "borders" for each layer are easier -- all the coordinates come from the SVG, after translating and scaling.

Increasing the sloppiness makes this way cooler. +1

I like upping the sloppiness on layers 2 and 4 to make a sort of "Two-Face" logo: http://imgur.com/z1iSH

Increasing sloppiness on one half + hitting redraw a bunch makes the coolest: http://i.imgur.com/60dEI.png

Semi-related: Whats a good fall-back for when webgl isn't directly supported in the browser?

Cool, but needs a cancel button that stops drawing and re-enables the sliders.

Done! As a bonus, you can now dynamically change the parameters while it is drawing.

This is hacker news, shouldn't they be evolving the shape, instead of just straight drawing it? Also, it should be powered by node.js somehow, and have $3 million in seed funding.

Reply on news.ycombinator.com