Class: UIImage

Inherits:
Object
  • Object
show all
Defined in:
lib/purplish-red/non-ui/ui_image.rb

Overview

Stuff I copied from MOCommon, some new

Constant Summary collapse

M_PI = 
3.14159265358979323846264338327950288

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.size_at_path(s) ⇒ Object 



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# File 'lib/purplish-red/non-ui/ui_image.rb', line 5

def self.size_at_path(s)
  imageFileURL = NSURL.fileURLWithPath(s)
  imageSource = CGImageSourceCreateWithURL(imageFileURL, nil)
  if imageSource.nil?
    #p "Error loading image"
  else
    imageProperties = CGImageSourceCopyPropertiesAtIndex(imageSource, 0, {KCGImageSourceShouldCache => false})
    if imageProperties.nil?
      #p "Failed to get properties for image"
    else
      return CGSizeMake(imageProperties[KCGImagePropertyPixelWidth], imageProperties[KCGImagePropertyPixelHeight])
    end
  end

  return CGSizeZero
end

Instance Method Details

#height ⇒ Object 



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# File 'lib/purplish-red/non-ui/ui_image.rb', line 40

def height
  size.height
end

#image_by_cropping_to_center_size(aSize) ⇒ Object 



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# File 'lib/purplish-red/non-ui/ui_image.rb', line 108

def image_by_cropping_to_center_size(aSize)
  if aSize.width/aSize.height > size.width/size.height
    return image_by_cropping_to_rect(CGRect.new([0, (size.height-aSize.height)/2], [aSize.width, aSize.height]))
  else
    return image_by_cropping_to_rect(CGRect.new([(size.width-aSize.width)/2, 0], [aSize.width, aSize.height]))
  end
end

#image_by_cropping_to_rect(aRect) ⇒ Object

aRect is assumed to be in the “same scale” as self



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# File 'lib/purplish-red/non-ui/ui_image.rb', line 98

def image_by_cropping_to_rect(aRect)
  if aRect.is_a? CGRect
    cropped = CGImageCreateWithImageInRect(self.CGImage, [[aRect.origin.x*self.scale, aRect.origin.y*self.scale], [aRect.size.width*self.scale, aRect.size.height*self.scale]])
  else
    cropped = CGImageCreateWithImageInRect(self.CGImage, [[aRect[0][0]*self.scale, aRect[0][1]*self.scale], [aRect[1][0]*self.scale, aRect[1][1]*self.scale]])
  end
  UIImage.imageWithCGImage(cropped, scale:self.scale, orientation:self.imageOrientation)
end

#rotate_to_correct_orientation ⇒ Object 



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# File 'lib/purplish-red/non-ui/ui_image.rb', line 222

def rotate_to_correct_orientation
 rotate_with_orientation(imageOrientation)
end

#rotate_with_orientation(anOrientation) ⇒ Object 



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# File 'lib/purplish-red/non-ui/ui_image.rb', line 117

def rotate_with_orientation(anOrientation)
  #Front camera? We try to make fix it
  if (size.width == 640 && size.height == 480) || (size.width == 480 && size.height == 640)
    p 'Front camera photo'
    if anOrientation == UIImageOrientationUp
      #EXIF = 1
    elsif anOrientation == UIImageOrientationDown
      #EXIF = 3
      anOrientation = UIImageOrientationLeftMirrored
    elsif anOrientation == UIImageOrientationLeft
      #EXIF = 6
    elsif anOrientation == UIImageOrientationRight
      #EXIF = 8
      anOrientation = UIImageOrientationLeftMirrored
    elsif anOrientation == UIImageOrientationUpMirrored
      #EXIF = 2
    elsif anOrientation == UIImageOrientationDownMirrored
      #EXIF = 4
    elsif anOrientation == UIImageOrientationLeftMirrored
      #EXIF = 5
    elsif UIImageOrientationRightMirrored
      #EXIF = 7
      anOrientation = UIImageOrientationRightMirrored
    end
  elsif
    p 'Not front camera photo'
  end	

  imgRef = self.CGImage
  width = CGImageGetWidth(imgRef)
  height = CGImageGetHeight(imgRef)
  transform = CGAffineTransformIdentity
  bounds = CGRect.new([0, 0], [width, height])
  imageSize = CGSize.new(width, height)

  if anOrientation == UIImageOrientationUp
    #EXIF = 1
    transform = CGAffineTransformIdentity
  elsif anOrientation == UIImageOrientationUpMirrored
    #EXIF = 2
    transform = CGAffineTransformMakeTranslation(imageSize.width, 0.0)
    transform = CGAffineTransformScale(transform, -1.0, 1.0)
  elsif anOrientation == UIImageOrientationDown
    #EXIF = 3
    transform = CGAffineTransformMakeTranslation(imageSize.width, imageSize.height)
    transform = CGAffineTransformRotate(transform, M_PI)
  elsif anOrientation == UIImageOrientationDownMirrored
    #EXIF = 4
    transform = CGAffineTransformMakeTranslation(0.0, imageSize.height)
    transform = CGAffineTransformScale(transform, 1.0, -1.0)
  elsif anOrientation == UIImageOrientationLeftMirrored
    #EXIF = 5
    boundHeight = bounds.size.height
    bounds.size.height = bounds.size.width
    bounds.size.width = boundHeight
    transform = CGAffineTransformMakeTranslation(imageSize.height, imageSize.width)
    transform = CGAffineTransformScale(transform, -1.0, 1.0)
    transform = CGAffineTransformRotate(transform, 3.0 * M_PI / 2.0)
  elsif anOrientation == UIImageOrientationLeft
    #EXIF = 6
    boundHeight = bounds.size.height
    bounds.size.height = bounds.size.width
    bounds.size.width = boundHeight
    transform = CGAffineTransformMakeTranslation(0.0, imageSize.width)
    transform = CGAffineTransformRotate(transform, 3.0 * M_PI / 2.0)
  elsif anOrientation == UIImageOrientationRightMirrored
    #EXIF = 7
    boundHeight = bounds.size.height
    bounds.size.height = bounds.size.width
    bounds.size.width = boundHeight
    transform = CGAffineTransformMakeScale(-1.0, 1.0)
    transform = CGAffineTransformRotate(transform, M_PI / 2.0)
  elsif anOrientation == UIImageOrientationRight
    #EXIF = 8
    boundHeight = bounds.size.height
    bounds.size.height = bounds.size.width
    bounds.size.width = boundHeight
    transform = CGAffineTransformMakeTranslation(imageSize.height, 0.0)
    transform = CGAffineTransformRotate(transform, M_PI / 2.0)
  end

  UIGraphicsBeginImageContext(bounds.size)
  context = UIGraphicsGetCurrentContext()

  if anOrientation == UIImageOrientationRight || anOrientation == UIImageOrientationLeft
    CGContextScaleCTM(context, -1, 1)
    CGContextTranslateCTM(context, -height, 0)
  elsif anOrientation == UIImageOrientationLeft || anOrientation == UIImageOrientationLeftMirrored || anOrientation == UIImageOrientationRightMirrored
    CGContextScaleCTM(context, 1, -1)
    CGContextTranslateCTM(context, 0, -width)
  else
    CGContextScaleCTM(context, 1, -1)
    CGContextTranslateCTM(context, 0, -height)
  end

  CGContextConcatCTM(context, transform)

  CGContextDrawImage(UIGraphicsGetCurrentContext(), CGRect.new([0, 0], [width, height]), imgRef)
  imageCopy = UIGraphicsGetImageFromCurrentImageContext()
  UIGraphicsEndImageContext()

  imageCopy
end

#scale_aspect_to_fill_size(aSize) ⇒ Object

Preserve aspect ratio while scaling to fill. Part of the content may be clipped



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# File 'lib/purplish-red/non-ui/ui_image.rb', line 86

def scale_aspect_to_fill_size(aSize)
  if aSize.width/aSize.height > size.width/size.height
    croppedImg = image_by_cropping_to_center_size(CGSize.new(size.width, (size.width/aSize.width * aSize.height).to_i))
  else
    croppedImg = image_by_cropping_to_center_size(CGSize.new((size.height/aSize.height * aSize.width).to_i, size.height))
  end

  croppedImg.scale_to_size(aSize)
end

#scale_aspect_to_maximum_size(aSize) ⇒ Object

Preserve aspect ratio while scaling. E.g if aSize = (612,612), the longer side will be 612 and the shorter side will be at most 612



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# File 'lib/purplish-red/non-ui/ui_image.rb', line 62

def scale_aspect_to_maximum_size(aSize)
  if aSize.width/aSize.height > self.size.width/self.size.height
    s = CGSize.new((aSize.height/size.height * size.width).to_i, aSize.height)
  else
    s = CGSize.new(aSize.width, (aSize.width/size.width * size.height).to_i)
  end

  scale_to_size(s)
end

#scale_aspect_to_minimum_size(aSize) ⇒ Object

Preserve aspect ratio while scaling. E.g if aSize = (612,612), the shorter side will be 612 and the shorter side will be at least 612



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# File 'lib/purplish-red/non-ui/ui_image.rb', line 74

def scale_aspect_to_minimum_size(aSize)
  if aSize.width/aSize.height > self.size.width/self.size.height
    s = CGSize.new(aSize.width, (aSize.width/size.width * size.height).to_i)
  else
    s = CGSize.new((aSize.height/size.height * size.width).to_i, aSize.height)
  end

  scale_to_size(s)
end

#scale_aspect_to_size(size) ⇒ Object 



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# File 'lib/purplish-red/non-ui/ui_image.rb', line 45

def scale_aspect_to_size(size)
  scale_aspect_to_maximum_size(size)
end

#scale_to_size(size) ⇒ Object 



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# File 'lib/purplish-red/non-ui/ui_image.rb', line 50

def scale_to_size(size)
  colorSpace = CGColorSpaceCreateDeviceRGB()

  context = CGBitmapContextCreate(nil, size.width*scale, size.height*scale, 8, size.width*4*scale, colorSpace, KCGImageAlphaPremultipliedLast)
  imageReference = self.CGImage
  CGContextDrawImage(context, CGRectMake(0, 0, size.width*scale, size.height*scale), imageReference)
  copy = CGBitmapContextCreateImage(context)
  UIImage.imageWithCGImage(copy, scale:scale, orientation:imageOrientation)
end

#show_globally ⇒ Object 



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# File 'lib/purplish-red/non-ui/ui_image.rb', line 227

def show_globally
  btn = self.to_btn
  btn.addTarget(btn, action:'removeFromSuperview', forControlEvents:UIControlEventTouchUpInside)
  parent = App.delegate.window
  btn.backgroundColor = UIColor.redColor
  btn.center_x = parent.width/2
  btn.center_y = parent.height/2
  parent.addSubview(btn)
end

#to_btn ⇒ Object 



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# File 'lib/purplish-red/non-ui/ui_image.rb', line 23

def to_btn
  b = UIButton.buttonWithType(UIButtonTypeCustom)
  b.setImage(self, forState:UIControlStateNormal)
  b.frame = [[0, 0], [size.width, size.height]]
  b
end

#to_imgv ⇒ Object 



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# File 'lib/purplish-red/non-ui/ui_image.rb', line 30

def to_imgv
  UIImageView.alloc.initWithImage(self)
end

#width ⇒ Object 



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# File 'lib/purplish-red/non-ui/ui_image.rb', line 35

def width
  size.width
end