PhotoMatrix

public class PhotoMatrix

A 2-d matrix of photos that can be rendered as a UIImage.

Specification Properties:

  • photos[col,row] : the possibly-nil photo stored at the given column and row.
  • columns : Int - the number of columns
  • rows : Int - the nubmer of rows
  • tileSize : Size - the size to render each photo stored in the matrix

Abstract Invariant:

  • all photos stored in the matrix must have size == tileSize.
  • For all photo, count[photo] == number of times photo appears in photos.

  • Number of rows in the matrix

    Declaration

    Swift

    public let rows: Int

  • Number of columns in the matrix

    Declaration

    Swift

    public let columns: Int

  • The size of each photo in the matrix

    Declaration

    Swift

    public let tileSize: Size

  • Create a new PhotoMatrix with the given parameters.

    Effects: Creates a new PhotoMatrix w/ the given properties.

    Declaration

    Swift

    public init(columns: Int, rows: Int, tileSize: Size)

  • Get/set the photo at the given column and row.

    Requires:

    • (column,row) must be in the bounds of the matrix, and
    • any photo stored in the matrix must have size == tileSize.

    Declaration

    Swift

    public subscript(column: Int, row: Int) -> Photo? { get set }

  • The photo matrix rendered as a UIImage. Any empty matrix slots are left as black rectangles.

    Note

    This may be computation expensive and should not run on the main UI thread.

    Declaration

    Swift

    public var image: UIImage { get }

  • Counts how many times a photo appears in the matrix.

    Note

    This is O(1).

    Declaration

    Swift

    public func count(of photo: Photo) -> Int

    Parameters

    photo

    The photo to look for.

    Return Value

    how many entries in the photos contains that photo.