# Ways to create 4D noise

Simon comparing possibilities to create 4D noise in different computer languages:

# Snake Game in Codea

We were caught up in the rain and had to wait at a restaurant. What do you do in a situation like this? Simon made a snake game on his iPad, inspired by something he saw on the D3 library:

# Vector Math in Codea with Box2D. Simon’s own code.

Simon built a program in Codea visualizing the absolute value of a vector:

# Simon’s Codea Tutorials and the Arc-Tangent

A set of awesome Codea tutorials that Simon recorded for those who are just starting to program in Codea. Simon ported examples from Processing (java) into Codea (Lua):

In the second tutorial (in two parts), Simon explains how to write a physics simulation program in Codea using forces like gravity, friction and spring force. Anyone watching will get to use some trigonometry and see what arc-tangent is for! The original code in Java comes from Keith Peters (Processing).

Here are some notes from when Simon was explaining the arc-tangent to me the other day:

# Pong translated from Codea into Processing

Simon translating the game of Pong from Codea (Lua) into Processing (Java).

# Simon solved the bug in his Bit Invader game!

Simon actually managed to solve the bug in his Bit invader code! This is a game he was translating from Codea into JavaScript, we have already published a blog post about it here.

The project is available on Simon’s page in Codepen:

In the two videos below Simon explains what the bug was (he had forgotten a “break” statement). He insisted I include both videos, but actually only the second one is informative:

Simon still needs to add explosions to this game (make the enemies explode), so there will probably be a follow-up on this one.

# Translating Bit Invader from Codea into JavaScript

Simon tried to reconstruct Bit Invader game (from Codea.io) in JavaScript, but got stuck at a certain point when he was programming the enemy to recognize the hero and the bullets. Here is how far he got. The project is available on Simon’s page in Codepen:

# RGB Project in Codea using SVG Color Map

On Monday this week Simon spent hours converting hexadecimals into RGBA values for the 140 colors supported by all modern browsers and creating a color file in Codea. He used the w3schools color map available at https://www.w3schools.com/colors/colors_groups.asp and an html color codes converter http://html-color-codes.info/

Some of the color names were quite exotic (like Chartreuse or Bisque ), and we looked those up together in the dictionary. We also took a very close look at the relation between red, green and blue values and found out that red was added every time to make colors lighter, even in shades where you would not expect any red.

Simon later made a nice design pattern in Codea using the color file:

# Diffusion-Limited Aggregation translated into Codea

Simon translated Daniel Shiffman’s Diffusion-limited Aggregation Coding Challenge into Codea. The coding challenge explores the generative algorithm “Diffusion-Limited Aggregation”, whose visual pattern is generated from random walkers clustering around a seed (or set of seed) point(s).

Unfortunately, every time the iPad falls asleep the application seems to stop, so we never got a sizable tree.

# Ellipse Mode and Physics Lab tests translated from Codea into Processing

Some more translations, this time from Codea (Lua) into Processing (Java).

Ellipse Mode:

Blend Modes:

Physics Lab tests from Codea: