Structures

The following structures are available globally.

  • Dot

    A simple immutable struct to capture a point with a label.

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    Declaration

    Swift

    public struct Dot

  • A DotPuzzle ADT represents a connect-the-dots puzzle that is in the middle of being solved. To that end, the abstract state of this ADT is two properties:

    • conected: a list of dots that have already been connected, in the order that they were connected.
    • unconnected: a list of dots that have yet to be connected, in the order that the should be connected.

    Both sequences can be represented as arrays of Dots.

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    Declaration

    Swift

    public struct DotPuzzle

  • A structure to help us convert between two coordinate systems. Points in Model Coordinates are zoomed and shifted to produce points in View Coordinates.

    The abstract state for a conversion is:

    • zoomScale: the scale facter when going from model to view.
    • viewOffset: where the original in model coordinates appears in view coordinates.

    Abstraction Invariant: zoomScale > 0

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    Declaration

    Swift

    public struct ModelToViewCoordinates