How to fetch current date and time using Javascript

JavaScript Current Time Clock

With the newly created Date Object we can show the current date and time, now only a variable which store the current date and time. We have to only print the information.

To print the information we have to utilize all the given blow function.

getTime() – Number of milliseconds since 1/1/1970 @ 12:00 AM

getSeconds() – Number of seconds (0-59)

getMinutes() – Number of minutes (0-59)

getHours() – Number of hours (0-23)

getDay() – Day of the week(0-6). 0 = Sunday, … , 6 = Saturday

getDate() – Day of the month (0-31)

getMonth() – Number of month (0-11)

getFullYear() – The four digit year (1970-9999)

Now we can print the date and time information according to to their format.

Code:

<script type=”text/javascript”>

<!–

var currentTime = new Date()

var month = currentTime.getMonth() + 1

var day = currentTime.getDate()

var year = currentTime.getFullYear()

document.write(month + “/” + day + “/” + year)

//–>

</script>

iPhone Sample: Rotating UIImage inside UIImageView

The code below shows how to:
- Create a UIImage with an image file
- Create a UIImageView with the dimensions of the UIImage
- Add the UIImage to the UIImageView using the image property
- Add the UIImage to the View
- Create a CGAffineTransform CGAffineTransformMakeRotation
- Apply the CGAffineTransformMakeRotation to the UIImageView

UIImage *image = [UIImage imageNamed:@"image.png"];
UIImageView *imageView = [ [ UIImageView alloc ] initWithFrame:CGRectMake(0.0, 0.0, image.size.width, image.size.height) ];
imageView.image = image;
[self addSubview:imageView];
CGAffineTransform rotate = CGAffineTransformMakeRotation( 1.0 / 180.0 * 3.14 );
[imageView setTransform:rotate];

The referenced “image.png” needs to be dragged into the Resources folder of your project inside Xcode. This action will prompt you to confirm the copying of the file to the project folder.

How to create square thumbnails using iPhone SDK

- (UIImage *)thumbWithSideOfLength:(float)length {

NSString *subdir = @”my/images/directory”;
NSString *filename = @”myOriginalImage.png”;
NSString *fullPathToThumbImage = [subdir stringByAppendingPathComponent:[NSString stringWithFormat:@"%dx%d%@",(int) length, (int) length,filename];
NSString *fullPathToMainImage = [subdir stringByAppendingPathComponent:filename];

UIImage *thumbnail;

NSFileManager *fileManager = [NSFileManager defaultManager];

if ([fileManager fileExistsAtPath:fullPathToThumbImage] == YES) {
thumbnail = [UIImage imageWithContentsOfFile:fullPathToThumbImage];

}
else {
//couldn’t find a previously created thumb image so create one first…
UIImage *mainImage = [UIImage imageWithContentsOfFile:fullPathToMainImage];

UIImageView *mainImageView = [[UIImageView alloc] initWithImage:mainImage];

BOOL widthGreaterThanHeight = (mainImage.size.width > mainImage.size.height);
float sideFull = (widthGreaterThanHeight) ? mainImage.size.height : mainImage.size.width;

CGRect clippedRect = CGRectMake(0, 0, sideFull, sideFull);

//creating a square context the size of the final image which we will then
// manipulate and transform before drawing in the original image
UIGraphicsBeginImageContext(CGSizeMake(length, length));
CGContextRef currentContext = UIGraphicsGetCurrentContext();

CGContextClipToRect( currentContext, clippedRect);

CGFloat scaleFactor = length/sideFull;

if (widthGreaterThanHeight) {
//a landscape image – make context shift the original image to the left when drawn into the context
CGContextTranslateCTM(currentContext, -((mainImage.size.width – sideFull) / 2) * scaleFactor, 0);

}
else {
//a portfolio image – make context shift the original image upwards when drawn into the context
CGContextTranslateCTM(currentContext, 0, -((mainImage.size.height – sideFull) / 2) * scaleFactor);

}
//this will automatically scale any CGImage down/up to the required thumbnail side (length) when the CGImage gets drawn into the context on the next line of code
CGContextScaleCTM(currentContext, scaleFactor, scaleFactor);

[mainImageView.layer renderInContext:currentContext];

thumbnail = UIGraphicsGetImageFromCurrentImageContext();

UIGraphicsEndImageContext();
NSData *imageData = UIImagePNGRepresentation(thumbnail);

[imageData writeToFile:fullPathToThumbImage atomically:YES];

thumbnail = [UIImage imageWithContentsOfFile:fullPathToThumbImage];
}
return thumbnail;
}

iOS: How do I generate 8 unique random integers?

-(NSMutableArray *)getEightRandom {
  NSMutableArray *uniqueNumbers = [[[NSMutableArray alloc] init] autorelease];
  int r;
  while ([uniqueNumbers count] < 8) {
    r = arc4random();
    if (![uniqueNumbers containsObject:[NSNumber numberWithInt:r]]) {
      [uniqueNumbers addObject:[NSNumber numberWithInt:r]];
    }
  }
  return uniqueNumbers;
}

If you want to restrict to numbers less than some threshold M, then you can do this by:

-(NSMutableArray *)getEightRandomLessThan:(int)M {
  NSMutableArray *uniqueNumbers = [[[NSMutableArray alloc] init] autorelease];
  int r;
  while ([uniqueNumbers count] < 8) {
    r = arc4random() % M; // ADD 1 TO GET NUMBERS BETWEEN 1 AND M RATHER THAN 0 and M-1
    if (![uniqueNumbers containsObject:[NSNumber numberWithInt:r]]) {
      [uniqueNumbers addObject:[NSNumber numberWithInt:r]];
    }
  }
  return uniqueNumbers;
}

If M=8, or even if M is close to 8 (e.g. 9 or 10), then this takes a while and you can be more clever.

-(NSMutableArray *)getEightRandomLessThan:(int)M {
  NSMutableArray *listOfNumbers = [[NSMutableArray alloc] init];
  for (int i=0 ; i<M ; ++i) {
    [listOfNumbers addObject:[NSNumber numberWithInt:i]]; // ADD 1 TO GET NUMBERS BETWEEN 1 AND M RATHER THAN 0 and M-1
  }
  NSMutableArray *uniqueNumbers = [[[NSMutableArray alloc] init] autorelease];
  int r;
  while ([uniqueNumbers count] < 8) {
    r = arc4random() % [listOfNumbers count];
    if (![uniqueNumbers containsObject:[listOfNumbers objectAtIndex:r]]) {
      [uniqueNumbers addObject:[listOfNumbers objectAtIndex:r]];
    }
  }
  [listOfNumbers release];
  return uniqueNumbers;
}