Here is the code:

- (CGImageRef)CGImageRotatedByAngle:(CGImageRef)imgRef angle:(CGFloat)angle
{
  CGFloat angleInRadians = angle * (M_PI / 180);
  CGFloat width = CGImageGetWidth(imgRef);
  CGFloat height = CGImageGetHeight(imgRef);

  CGRect imgRect = CGRectMake(0, 0, width, height);
  CGAffineTransform transform = CGAffineTransformMakeRotation(angleInRadians);
  CGRect rotatedRect = CGRectApplyAffineTransform(imgRect, transform);

  CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
  CGContextRef bmContext = CGBitmapContextCreate(NULL,
                                                 rotatedRect.size.width,
                                                 rotatedRect.size.height,
                                                 8,
                                                 0,
                                                 colorSpace,
                                                 kCGImageAlphaPremultipliedFirst);
  CGContextSetAllowsAntialiasing(bmContext, FALSE);
  CGContextSetInterpolationQuality(bmContext, kCGInterpolationNone);
  CGColorSpaceRelease(colorSpace);
  CGContextTranslateCTM(bmContext,
                        +(rotatedRect.size.width/2),
                        +(rotatedRect.size.height/2));
  CGContextRotateCTM(bmContext, angleInRadians);
  CGContextTranslateCTM(bmContext,
                        -(rotatedRect.size.width/2),
                        -(rotatedRect.size.height/2));
  CGContextDrawImage(bmContext, CGRectMake(0, 0,
                                           rotatedRect.size.width,
                                           rotatedRect.size.height),
                     imgRef);

  CGImageRef rotatedImage = CGBitmapContextCreateImage(bmContext);
  CFRelease(bmContext);
  [(id)rotatedImage autorelease];

  return rotatedImage;
}

CMLog: I use this macro to replace NSLog:

#define CMLog(format, ...) NSLog(@"%s:%@", __PRETTY_FUNCTION__,[NSString stringWithFormat:format, ## __VA_ARGS__]);

When you use this macro, it outputs text to the console, including the class and method from where it was called. So, if you call this macro from the class MyAppDelegate and the method applicationDidFinishLaunching,

CMLog(@"My iPhone is an %@, v %@", [[UIDevice currentDevice] model], [[UIDevice currentDevice] systemVersion]);

you get this in the console:

2009-01-05 10:06:28.957 MyApp15173:20b] -[MyAppDelegate applicationDidFinishLaunching:]:My iPhone is an iPhone Simulator, v 2.2

MARK: I use this macro to just output the name of class and method it was called from. Useful to know if a method was called.

#define MARK	CMLog(@"%s", __PRETTY_FUNCTION__);

START_TIMER and END_TIMER: These are for benchmarking a method:

#define START_TIMER NSTimeInterval start = [NSDate timeIntervalSinceReferenceDate];
#define END_TIMER(msg) 	NSTimeInterval stop = [NSDate timeIntervalSinceReferenceDate]; CMLog([NSString stringWithFormat:@"%@ Time = %f", msg, stop-start]);

Just put a START_TIMER at the beginning of the block to benchmark, and END_TIMER and the end, and you’ll get the timing.

- (NSData *)loadDataFromURL:(NSString *)dataURL
{
  START_TIMER;
  NSData *data = [self doSomeStuff:dataURL];
  END_TIMER(@"loadDataFromURL");
  return data;
}

Will output:

2009-01-05 10:31:37.943 MyApp[15283:20b] -[MyAppDelegate loadDataFromURL:]:loadDataFromURL Time = 3.636021

Now wrap all these declarations in your precompiled header, using a conditional flag. This flag will be set to 1 for Debug, and 0 for release, so your app will not fill the console with output.

#if DEBUG==1
#define CMLog(format, ...) NSLog(@"%s:%@", __PRETTY_FUNCTION__,[NSString stringWithFormat:format, ## __VA_ARGS__]);
#define MARK	CMLog(@"%s", __PRETTY_FUNCTION__);
#define START_TIMER NSTimeInterval start = [NSDate timeIntervalSinceReferenceDate];
#define END_TIMER(msg) 	NSTimeInterval stop = [NSDate timeIntervalSinceReferenceDate]; CMLog([NSString stringWithFormat:@"%@ Time = %f", msg, stop-start]);
#else
#define CMLog(format, ...)
#define MARK
#define START_TIMER
#define END_TIMER(msg)
#endif

Just add this to your Debug target setting

OTHER_CFLAGS = -DDEBUG=1

and this to your Release target setting:

OTHER_CFLAGS = -DDEBUG=0

    <script language='javascript' type="text/javascript">
    function adjustHeight(maxHeight) {
      elem = document.getElementById("sign");
      height = elem.offsetHeight;
      current_size = elem.style.fontSize.replace('px','')/1;
      while ((current_size-- > 10) && (height > maxHeight)){
        elem.style.fontSize = current_size + 'px';
        height = elem.offsetHeight;
      }
    }
    </script>

This script will reduce the size of the div until it fits the required height, but with a minimum font-size of 10px hardcoded.

Now in the html, call the adjustHeight function, passing it the id of the div to adjust:

<body onload="adjustHeight(48)">
  <div id="sign" style="font-size:68px">This is the text that fits</div>
</body>

The trick here is that to read the fontSize of a div, the font-size property should be inline. If the font-size is declared in the CSS, you’ll have to use another much more complex method, described in http://developer.apple.com/internet/webcontent/styles.html.

PS: Instead of reading the font-size from the div, I could have hardcoded its value in the script, and avoided much trouble.

Since I was already working on how to get the list of windows on the screen, I just added some AppleScript to bring the window to the front.

This snippet doesnt use any undocumented techniques, it uses the CGWindow API introduced in Leopard.

I dont consider this code to be production ready, but it works.

Of course, TIMTOWTDI

See the code after the jump:

- (BOOL) bringWindowWithNameToFront:(NSString *) windowName
{
// Try to find a window named "windowName", and if found,
// bring it to the front
// Stephan Burlot 4/3/08

  CFArrayRef            windowList = CGWindowListCopyWindowInfo(kCGWindowListOptionOnScreenOnly, kCGNullWindowID);
  ProcessSerialNumber   myPSN = {kNoProcess, kNoProcess};
  BOOL                  returnValue = FALSE;

  for (NSMutableDictionary *entry in (NSArray *)windowList) {
    NSString *currentWindow = [entry objectForKey:(id)kCGWindowName];
    if ((currentWindow != NULL) && ([currentWindow isEqualToString:windowName]))
    {
      NSString *applicationName = [entry objectForKey:(id)kCGWindowOwnerName];
      int pid = [[entry objectForKey:(id)kCGWindowOwnerPID] intValue];
      GetProcessForPID(pid, &myPSN);

      NSString *script= [NSString stringWithFormat:@"tell application \"System Events\" to tell process \"%@\" to perform action \"AXRaise\" of window \"%@\"\ntell application \"%@\" to activate\n", applicationName, windowName, applicationName];
      NSAppleScript *as = [[NSAppleScript alloc] initWithSource:script];
      [as compileAndReturnError:NULL];
      [as executeAndReturnError:NULL];  // Bring it on!
      [as release];
      returnValue = TRUE;
    }
  }

  CFRelease(windowList);
  return returnValue;
}

Inspiration camed from the following codes:

• SonOfGrab sample from Apple
• Desktop Manager source