Simulator Ruby Gem

Intro I’ve been working on this off and on for awhile. Simulator is a Ruby gem which provides functionality for creating discrete time models, and running those models. You can find the Homepage for the Simulator gem on Github. Take the following two examples included with the gem. Ball Drop Let’s say we want to model a […]

Generating offline maps for iOS applications

Introduction Recently, I had to implement an offline mapping solution for an iOS application. Here’s a walkthrough of how to do it. Summary I generated a tile database using TileMill. I used the Route-Me iOS library which provides a map view that supports offline tile sources. TileMill Actually, generation of the tile database was the […]

Corona SDK Error: CGImageDestinationFinalize image destination does not have enough images

I am hacking around with Corona SDK. I got the following error when switching scenes to one that already existed. (I was implementing a “Go Back” button.) The symptom was that a button from a previous scene wasn’t removed from the scene when I called storyboard.gotoScene. The problem was that I wasn’t adding the button […]

Cocos2d iOS Game: Balloon Burst

My employer gives us a week off for the holidays, so I’d been trying to decide what to do with all of the time. Although I originally didn’t want to work on any programming projects, I wound up working on a few. One of them was inspired by a play of the iOS game Train […]

OSX Lion Rubygame Install

I tried setting up Rubygame on Snow Leopard this time last year. I had many difficulties setting up SDL. I had some time to kill so I tried to set it up again, this time on my new MacBook Air running Lion. This old blog post from 2005 helped me this time around: //inquirylabs.com/blog2005/?p=21 to […]

Dominos-Style Game

My wife loves PopCap’s game Alchemy. It’s a dominoes-like game, where you match up alchemic symbols and various colors. The object of the game is to turn each board-square from lead to gold. I have been wanting to try out the limejs game library, which is based on Google’s Closure compiler, so I decided to […]

Mobile JS Framework Comparison

I did a quick matrix to compare various mobile JS frameworks in late May. It is probably a little outdated, especially with the recent Sencha merger, and I did not know DashCode could create web applications at the time, but maybe it will help someone. Enjoy! //bit.ly/d6Gsaj

Scifihifi-iPhone Keychain Wrapper

Here’s a great wrapper that really simplifies working with KeyChain in iOS //log.scifihifi.com/post/55837387/simple-iphone-keychain-code. The code is on GitHub as well //github.com/ldandersen/scifihifi-iphone/tree/master/security/. Apple’s official documentation is here, and there is also a sample project, but it’s not a good example for getting up and running quickly. The version of the project (last updated 10/2009) doesn’t even […]

Mediawiki-Usage/Changes Storage and Visualizations

A coworker and I have been doing some work on visualizations of wiki updates. The server-side code, written in Ruby, stores changes from a media-wiki feed. I got a chance to use the Google Visualization API, which is really simple and useful for a wide variety of domains. He also turned me on to HAML, […]

Graphiz Problem!

I was working on the Drupal OrgChart module tonight, specifically the rendering of the chart image via GraphViz, and I got stuck for at least an hour on a trifle! I planned to use the PEAR library for GraphViz (Image_GraphViz) and I wrote a function using the class it provides. I run the procedure and […]

Ruby Hiccups

I decided to try out some Ruby stuff this weekend. I wanted to do a quick little game with the rubygame gem, but I got some weird error attempting to install it on my 64-bit Snow Leopard Intel Mac Powerbook. I abandoned the effort, since I hate to expend time in system administration and installation. […]

Javascript Gaussian/Banker’s Rounding

Here’s a function for Gaussian/Banker’s Rounding in Javascript adapted from code written by Michael Boon at //boonedocks.net/. This can be useful if you’re working with Microsoft languages such as VBScript, which use Banker’s Rounding by default in their Round function. Javascript has no built-in gaussian rounding and, instead, uses Arithmetic rounding. For more information on […]

JSXGraph

Awesome JS graphics library compatible with JQuery and Prototype. JSXGraph » Examples

Gesture Recognition

I came across an awesome article on simple gesture recognition. This page implements a “$1 Gesture Recognizer” that is easy, cheap, and usable almost anywhere. It requires under 100 lines of easy code and achieves 97% recognition rates with only one template defined for each gesture below. With 3+ templates defined, accuracy exceeds 99%. //depts.washington.edu/aimgroup/proj/dollar/

Jamie Ly

Developer, student, person

Libraries