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//! Define an Orientation and associated methods.
use vec::Vec2;
/// Describes a vertical or horizontal orientation for a view.
#[derive(Clone,Copy,PartialEq)]
pub enum Orientation {
/// Horizontal orientation
Horizontal,
/// Vertical orientation
Vertical,
}
impl Orientation {
/// Returns the component of the given vector corresponding to this orientation.
/// (Horizontal will return the x value, and Vertical will return the y value.)
pub fn get(&self, v: &Vec2) -> usize {
match *self {
Orientation::Horizontal => v.x,
Orientation::Vertical => v.y,
}
}
/// Returns the other orientation.
pub fn swap(&self) -> Self {
match *self {
Orientation::Horizontal => Orientation::Vertical,
Orientation::Vertical => Orientation::Horizontal,
}
}
/// Returns a mutable reference to the component of the given vector
/// corresponding to this orientation.
pub fn get_ref<'a, 'b>(&'a self, v: &'b mut Vec2) -> &'b mut usize {
match *self {
Orientation::Horizontal => &mut v.x,
Orientation::Vertical => &mut v.y,
}
}
/// Takes an iterator on sizes, and stack them in the current orientation,
/// returning the size of the required bounding box.
///
/// For an horizontal view, returns (Sum(x), Max(y)).
/// For a vertical view, returns (Max(x),Sum(y)).
pub fn stack<'a, T: Iterator<Item = &'a Vec2>>(&self, iter: T) -> Vec2 {
match *self {
Orientation::Horizontal => iter.fold(Vec2::zero(), |a, b| a.stack_horizontal(&b)),
Orientation::Vertical => iter.fold(Vec2::zero(), |a, b| a.stack_vertical(&b)),
}
}
}