38 lines
1.3 KiB
Rust
38 lines
1.3 KiB
Rust
|
//! 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(),
|
||
|
|
},
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|