Rubymotion Versions Of Image_Cropper

image_cropper.rb

class UIImage
  def crop_at(rect)
    UIGraphicsBeginImageContext(rect.size)
    context = UIGraphicsGetCurrentContext()

    clipped_rect = CGRectMake(0, 0, rect.size.width, rect.size.height)
    CGContextClipToRect( context, clipped_rect)

    draw_rect = CGRectMake(rect.origin.x * -1,
                                 rect.origin.y * -1,
                                 self.size.width,
                                 self.size.height)
    CGContextTranslateCTM(context, 0.0, rect.size.height)
    CGContextScaleCTM(context, 1.0, -1.0)
    CGContextDrawImage(context, draw_rect, self.CGImage)
    cropped = UIGraphicsGetImageFromCurrentImageContext()
    UIGraphicsEndImageContext()
    cropped
  end
end