Programming on Arcanelab Blog

2D Drawing in OpenGL

Fri, 30 Dec 2011 06:44:00 +0100

How to convert an integer to a hexadecimal string in C++ int number = 42; stringstream…

Sat, 10 Dec 2011 06:58:00 +0100

How to convert an integer to a hexadecimal string in C++

int number = 42;
stringstream ss;
ss << hex << number;
// now ss.str(), which is a string, contains "2a"

Getting the UDID of an iOS device [[UIDevice currentDevice] uniqueIdentifier]

Tue, 18 Jan 2011 19:48:00 +0100

Getting the UDID of an iOS device

[[UIDevice currentDevice] uniqueIdentifier]

Mac OS X Debugging Magic

Sat, 09 Oct 2010 13:59:00 +0200

how to debug EXC_BAD_ACCESS on iPhone

Sat, 09 Oct 2010 13:57:00 +0200

Great guide for memory-debugging in Instruments

Thu, 30 Sep 2010 23:34:00 +0200

iroundf A few minutes ago I wrote a rounding function for myself in C.

Wed, 29 Sep 2010 04:00:00 +0200

iroundf

A few minutes ago I wrote a rounding function for myself in C. Probably not the best implementation, but it works all right. If you’re interested, check it out (I’ve put some sample values in the comments):

int iroundf(float value)
{
    if(value > 0.0)
    {        
        int unsigned cutvalue = (unsigned int)value; // 3.8234234 => 3
        float remain = value - cutvalue; // 3.8234234-3 = 0.8234234
        
        if(remain >= 0.5) // 0.8234234 >= 0.5 => TRUE 
            return cutvalue + 1; // iroundf(3.8234234) => 4
        else
            return cutvalue;
    }
    
    if(value < 0.0)
    {
        int cutvalue = (int)value; // -1.34 => -1 // -4.67 => -4
        float remain = value - cutvalue; // -1.34-(-1) = -0.34 // -4.64-(-4) = -0.64
        
        if(remain >= -0.5) // -0.31 >= -0.5 => TRUE // -0.61 >= -0.5 => FALSE
            return cutvalue; // iroundf(-1.34) => -1
        else
            return cutvalue - 1; // iroundf(-4.67) => -5
    }
    
    return 0;
}

update: I just came across the following very short and elegant solution (talk about forests and trees…)

A nice article on iPhone application internationalization

Sun, 26 Sep 2010 22:11:00 +0200

Getting filepath to the Documents folder on iPhone To achieve the task written in the…

Fri, 24 Sep 2010 18:07:00 +0200

Getting filepath to the Documents folder on iPhone

To achieve the task written in the title of this post, you have to do the following:

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); 
NSString *documentsPath = [paths objectAtIndex:0];

Button resize causing text blur?

Tue, 14 Sep 2010 00:44:00 +0200

Button resize causing text blur?

Today I noticed a very, very strange behaviour (bug?) in Xcode. I am creating buttons for my iPhone application with a custom image background and a text on top of it. The Interface Builder attributes window looks like this:

Usually I change the font-family and size for my text, but when I do this, the button dimensions suddenly grow pretty big. So I just head over to the Button Size tab and reset the dimension values to the originals, like so:

View overlapped by the title bar During the development of my latest iPhone project I…

Fri, 10 Sep 2010 20:04:00 +0200

View overlapped by the title bar

During the development of my latest iPhone project I faced a strange phenomenon: if I enable the title bar on a screen, the current view is placed to the coordinates (0,0), right beneath the title bar. Also, since the height of the view is not 100% (to leave space for the title bar), there’s an empty space left under the view.

Here’s an example:

Quick Look source code preview & syntax highlighting on Mac Without much rambling, a…

Tue, 07 Sep 2010 14:15:00 +0200

Quick Look source code preview & syntax highlighting on Mac

Without much rambling, a solution for the problem presented in the title: http://code.google.com/p/qlcolorcode/

To change the color style (theme), use the following command:

defaults write org.n8gray.QLColorCode hlTheme [theme name]

Where [theme name] can be:

acid, bipolar, blacknblue, bright, contrast, darkblue, darkness, desert, easter, emacs, golden, greenlcd, ide-anjuta, ide-codewarrior, ide-devcpp, ide-eclipse, ide-kdev, ide-msvcpp, ide-xcode, kwrite, lucretia, matlab, moe, navy, nedit, neon, night, orion, pablo, peachpuff, print, rand01, seashell, slateGreen, the, typical, vampire, vim-dark, vim, whitengrey, zellner

C/C++ trick with logical operators Let me show a nice C/C++ trick I just found out:…

Sat, 04 Sep 2010 02:14:00 +0200

C/C++ trick with logical operators

Let me show a nice C/C++ trick I just found out:

Instead of writing:

if (function1())
 function2();

you could write:

function1() && function2();

because the right side of the && operator is only evaluated (in this case: called), when function1() is true (returns a non-null value).

Subsequently, instead of:

if (!function1()) // or if (function1()==0) etc.
 function2();

you could write:

function1() || function2();

Cool, eh?