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#[cfg(feature = "serde")]
use serde::{Deserialize, Serialize};
use {
crate::system::Vector2,
num_traits::AsPrimitive,
std::ops::{Add, Sub},
};
/// Utility type for manipulating 2D axis-aligned rectangles.
#[repr(C)]
#[derive(Clone, PartialEq, Eq, Debug, Copy, Default)]
#[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
pub struct Rect<T> {
/// Left coordinate of the rectangle.
pub left: T,
/// Top coordinate of the rectangle.
pub top: T,
/// Width of the rectangle.
pub width: T,
/// Height of the rectangle.
pub height: T,
}
/// A [`Rect`] of `i32`.
pub type IntRect = Rect<i32>;
/// A [`Rect`] of `f32`.
pub type FloatRect = Rect<f32>;
impl<T> Rect<T> {
/// Construct a rectangle from its coordinates.
///
/// # Usage Example
///
/// ```
/// # use sfml::graphics::Rect;
/// let rect = Rect::new(10, 10, 10, 10);
/// ```
pub const fn new(left: T, top: T, width: T, height: T) -> Self {
Rect {
left,
top,
width,
height,
}
}
/// Construct a rectangle from its position and size.
///
/// # Usage Example
///
/// ```
/// # use sfml::graphics::Rect;
/// # use sfml::system::Vector2;
/// let a = Vector2::new(10, 20);
/// let b = Vector2::new(30, 40);
/// let rect = Rect::from_vecs(a, b);
/// assert_eq!(rect, Rect::new(10, 20, 30, 40));
/// ```
pub fn from_vecs(pos: Vector2<T>, size: Vector2<T>) -> Rect<T> {
Rect {
left: pos.x,
top: pos.y,
width: size.x,
height: size.y,
}
}
/// Lossless conversion into `Rect<U>`.
///
/// # Usage Example
///
/// ```
/// # use sfml::graphics::Rect;
/// let a = Rect::new(1u8, 2u8, 3u8, 4u8);
/// let b: Rect<u32> = a.into_other();
/// assert_eq!(u8::try_from(b.top).unwrap(), a.top);
/// assert_eq!(u8::try_from(b.height).unwrap(), a.height);
/// assert_eq!(u8::try_from(b.left).unwrap(), a.left);
/// assert_eq!(u8::try_from(b.width).unwrap(), a.width);
/// ```
pub fn into_other<U>(self) -> Rect<U>
where
T: Into<U>,
{
Rect {
top: self.top.into(),
left: self.left.into(),
width: self.width.into(),
height: self.height.into(),
}
}
/// Fallible conversion into `Rect<U>`
///
/// # Usage Example
///
/// ```
/// # use sfml::graphics::Rect;
/// let a = Rect::new(1i16, 2i16, 3i16, 4i16);
/// let b: Rect<u8> = a.try_into_other().unwrap();
/// assert_eq!(i16::from(b.top), a.top);
/// assert_eq!(i16::from(b.height), a.height);
/// assert_eq!(i16::from(b.left), a.left);
/// assert_eq!(i16::from(b.width), a.width);
///
/// let a = Rect::new(-1i16, -2i16, -3i16, -4i16);
/// let b = a.try_into_other::<u8>();
/// assert!(b.is_err());
/// ```
pub fn try_into_other<U>(self) -> Result<Rect<U>, T::Error>
where
T: TryInto<U>,
{
Ok(Rect {
left: self.left.try_into()?,
top: self.top.try_into()?,
width: self.width.try_into()?,
height: self.height.try_into()?,
})
}
/// Lossy conversion into `Rect<U>`
///
/// # Usage Example
///
/// ```
/// # use sfml::graphics::Rect;
/// let a = Rect::new(2., 32.32, 3.34, 1.443);
/// let b: Rect<u8> = a.as_other();
/// assert_eq!(b.top, 32);
/// assert_eq!(b.left, 2);
/// assert_eq!(b.width, 3);
/// assert_eq!(b.height, 1);
/// ```
pub fn as_other<U: 'static + Copy>(self) -> Rect<U>
where
T: AsPrimitive<U>,
{
Rect {
left: self.left.as_(),
top: self.top.as_(),
width: self.width.as_(),
height: self.height.as_(),
}
}
/// Get the position of the rectangle's top-left corner
///
/// # Usage Example
///
/// ```
/// # use sfml::graphics::Rect;
/// # use sfml::system::Vector2;
/// let a = Rect::new(1, 2, 3, 4);
/// assert_eq!(a.position(), Vector2::new(1, 2));
/// ```
pub fn position(self) -> Vector2<T> {
Vector2::new(self.left, self.top)
}
/// Get the size of the rectangle
///
/// # Usage Example
///
/// ```
/// # use sfml::graphics::Rect;
/// # use sfml::system::Vector2;
/// let a = Rect::new(1, 2, 3, 4);
/// assert_eq!(a.size(), Vector2::new(3, 4));
/// ```
pub fn size(self) -> Vector2<T> {
Vector2::new(self.width, self.height)
}
}
impl<T: PartialOrd + Add<Output = T> + Sub<Output = T> + Copy> Rect<T> {
/// Check if a point is inside the rectangle's area.
///
/// # Usage Example
///
/// ```
/// # use sfml::graphics::Rect;
/// # use sfml::system::Vector2;
/// // Passing case
/// let a = Rect::new(0, 0, 4, 4);
/// let b = Vector2::new(2, 2);
/// assert!(a.contains(b));
///
/// // Failing case
/// let a = Rect::new(0, 0, 1, 1);
/// let b = Vector2::new(20, 10);
/// assert!(!a.contains(b));
/// ```
#[inline]
pub fn contains(self, point: Vector2<T>) -> bool {
self.contains2(point.x, point.y)
}
/// Check if a point is inside the rectangle's area.
///
/// # Usage Example
///
/// ```
/// # use sfml::graphics::Rect;
/// // Passing case
/// let a = Rect::new(0, 0, 4, 4);
/// assert!(a.contains2(2, 2));
///
/// // Failing case
/// let a = Rect::new(0, 0, 1, 1);
/// assert!(!a.contains2(20, 10));
/// ```
pub fn contains2(self, x: T, y: T) -> bool {
// Based on SFML's implementation.
// Rectangles with negative dimensions are allowed.
let (min_x, max_x) = min_max(self.left, self.left + self.width);
let (min_y, max_y) = min_max(self.top, self.top + self.height);
x >= min_x && x < max_x && y >= min_y && y < max_y
}
/// Returns the intersection between two rectangles, if any.
///
/// If the rectangles intersect, returns Some filled with the intersection
/// of the two rectangles. Otherwise, returns None.
///
/// # Usage Example
/// ```
/// # use sfml::graphics::Rect;
/// // Passing case
/// let a = Rect::new(0, 0, 2, 2);
/// let b = Rect::new(1, 1, 2, 2);
/// assert_eq!(a.intersection(&b), Some(Rect::new(1, 1, 1, 1)));
///
/// // Failing case
/// let a = Rect::new(0, 0, 2, 2);
/// let b = Rect::new(2, 2, 2, 2);
/// assert_eq!(a.intersection(&b), None);
/// ```
pub fn intersection(self, other: &Rect<T>) -> Option<Rect<T>> {
// Based on SFML's implementation.
// Compute the min and max coordinates on various axes.
let (r1_min_x, r1_max_x) = min_max(self.left, self.left + self.width);
let (r1_min_y, r1_max_y) = min_max(self.top, self.top + self.height);
let (r2_min_x, r2_max_x) = min_max(other.left, other.left + other.width);
let (r2_min_y, r2_max_y) = min_max(other.top, other.top + other.height);
// Compute the intersection.
let left = max(r1_min_x, r2_min_x);
let top = max(r1_min_y, r2_min_y);
let right = min(r1_max_x, r2_max_x);
let bottom = min(r1_max_y, r2_max_y);
// Return the result.
if left < right && top < bottom {
Some(Rect::new(left, top, right - left, bottom - top))
} else {
None
}
}
}
#[inline]
fn min<T: PartialOrd>(a: T, b: T) -> T {
if a < b { a } else { b }
}
#[inline]
fn max<T: PartialOrd>(a: T, b: T) -> T {
if a > b { a } else { b }
}
#[inline]
fn min_max<T: PartialOrd + Copy>(a: T, b: T) -> (T, T) {
(min(a, b), max(a, b))
}