com.google.appengine.api.images

## Interface IImagesServiceFactory

-     public interface IImagesServiceFactory

  Factory for creating an `ImagesService`, `Image`s and `Transform`s.

- - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `ImagesService` | `getImagesService()` Creates an implementation of the ImagesService.
    `Composite` | `makeComposite(Image image, int xOffset, int yOffset, float opacity, Composite.Anchor anchor)` Creates an image composition operation.
    `CompositeTransform` | `makeCompositeTransform()` Creates a composite transform that can represent multiple transforms applied in series.
    `CompositeTransform` | `makeCompositeTransform(java.util.Collection<Transform> transforms)` Creates a composite transform that can represent multiple transforms applied in series.
    `Transform` | `makeCrop(double leftX, double topY, double rightX, double bottomY)` Creates a transform that will crop an image to fit within the bounding box specified.
    `Transform` | `makeCrop(float leftX, float topY, float rightX, float bottomY)` Creates a transform that will crop an image to fit within the bounding box specified.
    `Transform` | `makeHorizontalFlip()` Creates a transform that will horizontally flip an image.
    `Image` | `makeImage(byte[] imageData)` Creates an image from the provided `imageData`.
    `Image` | `makeImageFromBlob(BlobKey blobKey)` Create an image backed by the specified `blobKey`.
    `Image` | `makeImageFromFilename(java.lang.String filename)` Create an image backed by the specified `filename`.
    `Transform` | `makeImFeelingLucky()` Creates a transform that automatically adjust contrast and color levels.
    `Transform` | `makeResize(int width, int height)` Creates a transform that will resize an image to fit within a box with width `width` and height `height`.
    `Transform` | `makeResize(int width, int height, boolean allowStretch)` Creates a resize transform that will resize an image to fit within a box of width `width` and height `height`.
    `Transform` | `makeResize(int width, int height, double cropOffsetX, double cropOffsetY)` Creates a transform that will resize an image to exactly fit a box with width `width` and height `height` by resizing to the less constraining dimension and cropping the other.
    `Transform` | `makeResize(int width, int height, float cropOffsetX, float cropOffsetY)` Creates a transform that will resize an image to exactly fit a box with width `width` and height `height` by resizing to the less constraining dimension and cropping the other.
    `Transform` | `makeRotate(int degrees)` Creates a transform that rotates an image by `degrees` degrees clockwise.
    `Transform` | `makeVerticalFlip()` Creates a transform that will vertically flip an image.

- - ### Method Detail

    - #### getImagesService

          ImagesService getImagesService()

      Creates an implementation of the ImagesService.
      Returns:
        an images service

    - #### makeImage

          Image makeImage(byte[] imageData)

      Creates an image from the provided `imageData`.
      Parameters:
        `imageData` - image data to store in the image
      Returns:
        an Image containing the supplied image data
      Throws:
        `java.lang.IllegalArgumentException` - If `imageData` is null or empty.

    - #### makeImageFromBlob

          Image makeImageFromBlob(BlobKey blobKey)

      Create an image backed by the specified `blobKey`. Note that the returned `Image` object can be used with all `ImagesService` methods, but most of the methods on the Image itself will currently throw `UnsupportedOperationException`.
      Parameters:
        `blobKey` - referencing the image
      Returns:
        an Image that references the specified blob data

    - #### makeImageFromFilename

          Image makeImageFromFilename(java.lang.String filename)

      Create an image backed by the specified `filename`. Note that the returned `Image` object can be used with all `ImagesService` methods, but most of the methods on the Image itself will currently throw `UnsupportedOperationException`.
      Parameters:
        `filename` - referencing the image. Currently only Google Storage files in the format "/gs/bucket_name/object_name" are supported.
      Returns:
        an Image that references the specified blob data
      Throws:
        `java.lang.IllegalArgumentException` - If `filename` is not in the format "/gs/bucket_name/object_name".
        `BlobstoreFailureException` - If there is an error obtaining the Google Storage access token for the `filename`.

    - #### makeResize

          Transform makeResize(int width,
                             int height)

      Creates a transform that will resize an image to fit within a box with width `width` and height `height`.
      Parameters:
        `width` - width of the bounding box
        `height` - height of the bounding box
      Returns:
        a resize transform
      Throws:
        `java.lang.IllegalArgumentException` - If `width` or `height` are negative or greater than `MAX_RESIZE_DIMENSIONS` or if both `width` and `height` are 0.

    - #### makeResize

          Transform makeResize(int width,
                             int height,
                             boolean allowStretch)

      Creates a resize transform that will resize an image to fit within a box of width `width` and height `height`. If `allowStretch` is `true`, the aspect ratio of the original image will be ignored.
      Parameters:
        `width` - width of the bounding box
        `height` - height of the bounding box
        `allowStretch` - allow the image to be resized ignoring the aspect ratio
      Returns:
        a resize transform
      Throws:
        `java.lang.IllegalArgumentException` - If `width` or `height` are negative or greater than `MAX_RESIZE_DIMENSIONS`, if both `width` and `height` are 0 or if is True and either `width` or `height` are 0.

    - #### makeResize

          Transform makeResize(int width,
                             int height,
                             float cropOffsetX,
                             float cropOffsetY)

      Creates a transform that will resize an image to exactly fit a box with width `width` and height `height` by resizing to the less constraining dimension and cropping the other. The center of the crop region is controlled by `cropOffsetX` and `cropOffsetY`.
      Parameters:
        `width` - width of the bounding box
        `height` - height of the bounding box
        `cropOffsetX` - the relative horizontal position of the center
        `cropOffsetY` - the relative vertical position of the center
      Returns:
        a resize transform
      Throws:
        `java.lang.IllegalArgumentException` - If `width` or `height` are negative or greater than `MAX_RESIZE_DIMENSIONS`, if either of `width` and `height` are 0 or if `cropOffsetX` or `cropOffsetY` are outside the range 0.0 to 1.0.

    - #### makeResize

          Transform makeResize(int width,
                             int height,
                             double cropOffsetX,
                             double cropOffsetY)

      Creates a transform that will resize an image to exactly fit a box with width `width` and height `height` by resizing to the less constraining dimension and cropping the other. The center of the crop region is controlled by `cropOffsetX` and `cropOffsetY`.
      Parameters:
        `width` - width of the bounding box
        `height` - height of the bounding box
        `cropOffsetX` - the relative horizontal position of the center
        `cropOffsetY` - the relative vertical position of the center
      Returns:
        a resize transform
      Throws:
        `java.lang.IllegalArgumentException` - If `width` or `height` are negative or greater than `MAX_RESIZE_DIMENSIONS`, if either of `width` and `height` are 0 or if `cropOffsetX` or `cropOffsetY` are outside the range 0.0 to 1.0.

    - #### makeCrop

          Transform makeCrop(float leftX,
                           float topY,
                           float rightX,
                           float bottomY)

      Creates a transform that will crop an image to fit within the bounding box specified. The arguments define the top left and bottom right corners of the bounding box used to crop the image as a percentage of the total image size. Each argument should be in the range 0.0 to 1.0 inclusive.
      Parameters:
        `leftX` - X coordinate of the top left corner of the bounding box
        `topY` - Y coordinate of the top left corner of the bounding box
        `rightX` - X coordinate of the bottom right corner of the bounding box
        `bottomY` - Y coordinate of the bottom right corner of the bounding box
      Returns:
        a crop transform
      Throws:
        `java.lang.IllegalArgumentException` - If any of the arguments are outside the range 0.0 to 1.0 or if `leftX >= rightX` or `topY >= bottomY`.

    - #### makeCrop

          Transform makeCrop(double leftX,
                           double topY,
                           double rightX,
                           double bottomY)

      Creates a transform that will crop an image to fit within the bounding box specified. The arguments define the top left and bottom right corners of the bounding box used to crop the image as a percentage of the total image size. Each argument should be in the range 0.0 to 1.0 inclusive.
      Parameters:
        `leftX` - X coordinate of the top left corner of the bounding box
        `topY` - Y coordinate of the top left corner of the bounding box
        `rightX` - X coordinate of the bottom right corner of the bounding box
        `bottomY` - Y coordinate of the bottom right corner of the bounding box
      Returns:
        a crop transform
      Throws:
        `java.lang.IllegalArgumentException` - If any of the arguments are outside the range 0.0 to 1.0 or if `leftX >= rightX` or `topY >= bottomY`.

    - #### makeVerticalFlip

          Transform makeVerticalFlip()

      Creates a transform that will vertically flip an image.
      Returns:
        a vertical flip transform

    - #### makeHorizontalFlip

          Transform makeHorizontalFlip()

      Creates a transform that will horizontally flip an image.
      Returns:
        a horizontal flip transform

    - #### makeRotate

          Transform makeRotate(int degrees)

      Creates a transform that rotates an image by `degrees` degrees clockwise.
      Parameters:
        `degrees` - The number of degrees by which to rotate. Must be a multiple of 90.
      Returns:
        a rotation transform
      Throws:
        `java.lang.IllegalArgumentException` - If `degrees` is not divisible by 90

    - #### makeImFeelingLucky

          Transform makeImFeelingLucky()

      Creates a transform that automatically adjust contrast and color levels. This is similar to the "I'm Feeling Lucky" button in Picasa.
      Returns:
        an ImFeelingLucky autolevel transform

    - #### makeCompositeTransform

          CompositeTransform makeCompositeTransform(java.util.Collection<Transform> transforms)

      Creates a composite transform that can represent multiple transforms applied in series.
      Parameters:
        `transforms` - Transforms for this composite transform to apply.
      Returns:
        a composite transform containing the provided transforms

    - #### makeCompositeTransform

          CompositeTransform makeCompositeTransform()

      Creates a composite transform that can represent multiple transforms applied in series.
      Returns:
        an empty composite transform

    - #### makeComposite

          Composite makeComposite(Image image,
                                int xOffset,
                                int yOffset,
                                float opacity,
                                Composite.Anchor anchor)

      Creates an image composition operation.
      Parameters:
        `image` - The image to be composited.
        `xOffset` - Offset in the x axis from the anchor point.
        `yOffset` - Offset in the y axis from the anchor point.
        `opacity` - Opacity to be used for the image in range [0.0, 1.0].
        `anchor` - Anchor position from the enum `Composite.Anchor`. The anchor position of the image is aligned with the anchor position of the canvas and then the offsets are applied.
      Returns:
        A composition operation.
      Throws:
        `java.lang.IllegalArgumentException` - If `image` is null or empty, `xOffset` or `yOffset` is outside the range [-4000, 4000], `opacity` is outside the range [0.0, 1.0] or `anchor` is null.