Visceral Logic Programming» Code tidbits and tutorials.

In developing software, the choice of tools used can affect the ease of the job significantly. While the choice of a language may dictate the compiler to be used, there are generally a number of options for the code editor. For most C, Objective-C, and Java applications, I use Apple’s XCode IDE for the simplicity of having the editor, compiler, and executable all in one interface. For projects in which I won’t be using XCode, however, I now generally use Smultron as the code editor.
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Posted by paul as OS X at 7:02 PM EDT

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The screensaver module in OS X has a command-line option that allows it to be run in the
background of your screen, as a replacement for the desktop picture. I found this in the
application bgscreensaver, which
contains an AppleScript to launch the screensaver module in the background, using a shell
command found by Michael Coyle at ResExcellence.

While this is pretty cool in and of itself, I wanted something that would let me run one
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Posted by paul as OS X, AppleScript, Unix Shell at 2:14 PM EST

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I compiled XFoil earlier today for my Mac. XFoil is an open-source airfoil analysis tool. There are various compiled binaries available for Windows systems, but for Unix computers, including Mac OS X, it must be built from the source code. This requires the use of a Fortran compiler. To build it on my Intel-based Mac (10.4.8), I made use of the GCC’s gfortran compiler, available here along with several other Mac Fortran compilers and other interesting stuff. Read the rest of this entry »

Posted by paul as Languages, OS X, Fortran at 5:26 PM EST

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This tutorial will show you how to write a program that creates MIDI files of guitar chords by processing text files. Although I wrote this in Objective-C and the GUI is built using Cocoa, the MIDI algorithms could easily be applied to another language or platform. Essentially, this program scans a text file to look for a chord or some other symbol that it recognizes. Then it translates that into MIDI format code, and continues parsing until it reaches the end of the file. Read the rest of this entry »

Posted by paul as Languages, Objective-C, OS X at 1:01 PM EST

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This tutorial builds on the Numerical Expression Solver tutorial, adding textual variables such as “e” or “pi”, and custom ones. Then you will create an applet that takes advantage of this new functionality by creating a graphical representation of an arbitrary expression at each point in space. Read the rest of this entry »

Posted by paul as Languages, Java at 8:25 AM EST

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This tutorial will show you how to write a Java program that takes a string input such as “3 + 4^2*7.5E-1*sin(22)” and convert it into a numerical answer, 2.893784 in this case, which you can use for whatever purpose you like. Read the rest of this entry »

Posted by paul as Languages, Java at 8:16 AM EST

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Visceral Logic Programming

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Smultron Code Editor

Desktop Screensaver Background

Compiling with gfortran

Guitar Chords to MIDI in Objective-C

Variables and Graphical Plots in Java

Numerical Expression Solver in Java