bme-ios - PhotoOrganizer

actionSheetClickedButtonAtIndex.m

- (void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex
{
    switch (buttonIndex) {
        case 0:
        {
            _selectedPhoto.transform = 
              CGAffineTransformRotate(_selectedPhoto.transform, -M_PI_2);
		 }
        break;
            
        case 1:
        {
            _selectedPhoto.transform = 
              CGAffineTransformRotate(_selectedPhoto.transform, M_PI_2);
        }
        break;
            
        default:
        break;
    }
}

handlePhotoLongPress.m

- (void)handlePhotoLongPress:(UIGestureRecognizer*)sender
{
    if (sender.state == UIGestureRecognizerStateBegan)
    {
        _selectedPhoto = (POPhotoView*)sender.view;
        UIActionSheet* actionSheet = [[UIActionSheet alloc] initWithTitle:@"Műveletek"
                                                                 delegate:self
                                                        cancelButtonTitle:@"Mégsem"
                                                   destructiveButtonTitle:nil
                                                        otherButtonTitles:@"Forgatás balra", @"Forgatás jobbra", @"Szürkeárnyalatos", nil];
        [actionSheet showFromRect:sender.view.frame inView:self.view animated:YES];
    }
}

handlePhotoTap.m

- (void)handlePhotoTap:(UITapGestureRecognizer*)sender
{
    POPhotoView* photo = (POPhotoView*)sender.view;
    [photo removeFromSuperview];
    [self.view addSubview:photo];
    
    if (photo.isExpanded)
    {
        photo.isExpanded = NO;        
        photo.bounds = photo.originalBounds;
        photo.center = photo.originalCenter;
    }
    else
    {
        photo.originalBounds = photo.bounds;
        photo.originalCenter = photo.center;
        photo.isExpanded = YES;
        
        CGPoint center = CGPointMake(
            self.view.bounds.size.width / 2, photo.center.y);
        if (center.y < photo.bounds.size.height * 1.5)
            center.y = photo.bounds.size.height * 1.5 + kPhotoPadding;
        photo.center = center;
        
        photo.bounds = CGRectMake(0, 0, photo.bounds.size.width * 3, 
            photo.bounds.size.height * 3);
    }
}

performOnAllPhotosAnimated.m

- (void)performOnAllPhotosAnimated:(void (^)(POPhotoView* photo))photoOperation
{
    for (UIView* view in self.view.subviews)
    {
        if ([view isKindOfClass:[POPhotoView class]])
        {
            [UIView animateWithDuration:0.5 delay:0 
               options:UIViewAnimationOptionCurveEaseInOut | 
               UIViewAnimationOptionLayoutSubviews 
               animations:^{
                photoOperation((POPhotoView*)view);
            } completion:nil];            
        }
    }
}

transformImageToGrayScale.m

+ (UIImage*)transformImageToGrayScale:(UIImage*)image
{
    CGContextRef ctx;
    CGImageRef imageRef = [image CGImage];
    NSUInteger width = CGImageGetWidth(imageRef);
    NSUInteger height = CGImageGetHeight(imageRef);
    CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
    unsigned char *rawData = malloc(height * width * 4);
    NSUInteger bytesPerPixel = 4;
    NSUInteger bytesPerRow = bytesPerPixel * width;
    NSUInteger bitsPerComponent = 8;
    CGContextRef context = CGBitmapContextCreate(rawData, width, height,
                                                 bitsPerComponent, bytesPerRow, colorSpace,
                                                 kCGImageAlphaPremultipliedLast | kCGBitmapByteOrder32Big);
    CGColorSpaceRelease(colorSpace);
    
    CGContextDrawImage(context, CGRectMake(0, 0, width, height), imageRef);
    CGContextRelease(context);
    
    int byteIndex = 0;
    for (int ii = 0 ; ii < width * height ; ++ii)
    {
        int outputColor = (rawData[byteIndex] + rawData[byteIndex+1] +
                           rawData[byteIndex+2]) / 3;
        
        rawData[byteIndex] = (char) (outputColor);
        rawData[byteIndex+1] = (char) (outputColor);
        rawData[byteIndex+2] = (char) (outputColor);
        
        byteIndex += 4;
    }
    
    ctx = CGBitmapContextCreate(rawData,
                                CGImageGetWidth( imageRef ),
                                CGImageGetHeight( imageRef ),
                                8,
                                CGImageGetBytesPerRow( imageRef ),
                                CGImageGetColorSpace( imageRef ),
                                kCGImageAlphaPremultipliedLast );
    
    imageRef = CGBitmapContextCreateImage (ctx);
    UIImage* rawImage = [UIImage imageWithCGImage:imageRef];
    
    CGContextRelease(ctx);
    free(rawData);
    
    return rawImage;
}