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//! Control the rotation of some content (like an image) with the `RotationLayout` within a
//! space.
use crate::Size;
/// The strategy used to rotate the content.
///
/// This is used to control the behavior of the layout when the content is rotated
/// by a certain angle.
#[derive(Debug, Hash, Clone, Copy, PartialEq, Eq)]
pub enum RotationLayout {
/// The layout is kept exactly as it was before the rotation.
///
/// This is especially useful when used for animations, as it will avoid the
/// layout being shifted or resized when smoothly i.e. an icon.
Keep,
/// The layout is adjusted to fit the rotated content.
///
/// This allows you to rotate an image and have the layout adjust to fit the new
/// size of the image.
Change,
}
impl RotationLayout {
/// Applies the rotation to the layout while respecting the [`RotationLayout`] strategy.
/// The rotation is given in radians.
pub fn apply_to_size(&self, size: Size, rotation: f32) -> Size {
match self {
Self::Keep => size,
Self::Change => Size {
width: (size.width * rotation.cos()).abs()
+ (size.height * rotation.sin()).abs(),
height: (size.width * rotation.sin()).abs()
+ (size.height * rotation.cos()).abs(),
},
}
}
}
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