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//! Orientation tracking for accelerometer-equipped devices.

mod tracker;

pub use self::tracker::Tracker;

/// Device orientation as computed from accelerometer data
#[derive(Copy, Clone, Debug, Eq, PartialEq)]
pub enum Orientation {
    /// Unable to determine the orientation from current data
    Unknown,

    /// Device is in portrait mode in whatever way is considered "up"
    PortraitUp,

    /// Device is in portrait mode in whatever way is considered "down"
    PortraitDown,

    /// Device is in landscape mode in whatever way is considered "up"
    LandscapeUp,

    /// Device is in landscape mode in whatever way is considered "down"
    LandscapeDown,

    /// Device is parallel to the ground, facing up
    FaceUp,

    /// Device is parallel to the ground, facing down
    FaceDown,
}

impl Orientation {
    /// Is this orientation considered to be flat?
    pub fn is_flat(self) -> bool {
        match self {
            Orientation::FaceUp | Orientation::FaceDown => true,
            _ => false,
        }
    }

    /// Is the device in a landscape orientation?
    pub fn is_landscape(self) -> bool {
        match self {
            Orientation::LandscapeUp | Orientation::LandscapeDown => true,
            _ => false,
        }
    }

    /// Is the device in a portrait orientation?
    pub fn is_portrait(self) -> bool {
        match self {
            Orientation::PortraitUp | Orientation::PortraitDown => true,
            _ => false,
        }
    }
}