14 2D矩形模块（ rect.rs）

一、 rect.rs源码

// Copyright 2013 The Servo Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.use super::UnknownUnit;
use crate::box2d::Box2D;
use crate::num::*;
use crate::point::Point2D;
use crate::scale::Scale;
use crate::side_offsets::SideOffsets2D;
use crate::size::Size2D;
use crate::vector::Vector2D;#[cfg(feature = "bytemuck")]
use bytemuck::{Pod, Zeroable};
use num_traits::{Float, NumCast};
#[cfg(feature = "serde")]
use serde::{Deserialize, Serialize};use core::borrow::Borrow;
use core::cmp::PartialOrd;
use core::fmt;
use core::hash::{Hash, Hasher};
use core::ops::{Add, Div, DivAssign, Mul, MulAssign, Range, Sub};/// A 2d Rectangle optionally tagged with a unit.
///
/// # Representation
///
/// `Rect` is represented by an origin point and a size.
///
/// See [`Box2D`] for a rectangle represented by two endpoints.
///
/// # Empty rectangle
///
/// A rectangle is considered empty (see [`is_empty`]) if any of the following is true:
/// - it's area is empty,
/// - it's area is negative (`size.x < 0` or `size.y < 0`),
/// - it contains NaNs.
///
/// [`is_empty`]: Self::is_empty
#[repr(C)]
#[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
#[cfg_attr(feature = "serde",serde(bound(serialize = "T: Serialize", deserialize = "T: Deserialize<'de>"))
)]
pub struct Rect<T, U> {pub origin: Point2D<T, U>,pub size: Size2D<T, U>,
}#[cfg(feature = "arbitrary")]
impl<'a, T, U> arbitrary::Arbitrary<'a> for Rect<T, U>
whereT: arbitrary::Arbitrary<'a>,
{fn arbitrary(u: &mut arbitrary::Unstructured<'a>) -> arbitrary::Result<Self> {let (origin, size) = arbitrary::Arbitrary::arbitrary(u)?;Ok(Rect { origin, size })}
}#[cfg(feature = "bytemuck")]
unsafe impl<T: Zeroable, U> Zeroable for Rect<T, U> {}#[cfg(feature = "bytemuck")]
unsafe impl<T: Pod, U: 'static> Pod for Rect<T, U> {}impl<T: Hash, U> Hash for Rect<T, U> {fn hash<H: Hasher>(&self, h: &mut H) {self.origin.hash(h);self.size.hash(h);}
}impl<T: Copy, U> Copy for Rect<T, U> {}impl<T: Clone, U> Clone for Rect<T, U> {fn clone(&self) -> Self {Self::new(self.origin.clone(), self.size.clone())}
}impl<T: PartialEq, U> PartialEq for Rect<T, U> {fn eq(&self, other: &Self) -> bool {self.origin.eq(&other.origin) && self.size.eq(&other.size)}
}impl<T: Eq, U> Eq for Rect<T, U> {}impl<T: fmt::Debug, U> fmt::Debug for Rect<T, U> {fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {write!(f, "Rect(")?;fmt::Debug::fmt(&self.size, f)?;write!(f, " at ")?;fmt::Debug::fmt(&self.origin, f)?;write!(f, ")")}
}impl<T: Default, U> Default for Rect<T, U> {fn default() -> Self {Rect::new(Default::default(), Default::default())}
}impl<T, U> Rect<T, U> {/// Constructor.#[inline]pub const fn new(origin: Point2D<T, U>, size: Size2D<T, U>) -> Self {Rect { origin, size }}
}impl<T, U> Rect<T, U>
whereT: Zero,
{/// Constructor, setting all sides to zero.#[inline]pub fn zero() -> Self {Rect::new(Point2D::origin(), Size2D::zero())}/// Creates a rect of the given size, at offset zero.#[inline]pub fn from_size(size: Size2D<T, U>) -> Self {Rect {origin: Point2D::zero(),size,}}
}impl<T, U> Rect<T, U>
whereT: Copy + Add<T, Output = T>,
{#[inline]pub fn min(&self) -> Point2D<T, U> {self.origin}#[inline]pub fn max(&self) -> Point2D<T, U> {self.origin + self.size}#[inline]pub fn max_x(&self) -> T {self.origin.x + self.size.width}#[inline]pub fn min_x(&self) -> T {self.origin.x}#[inline]pub fn max_y(&self) -> T {self.origin.y + self.size.height}#[inline]pub fn min_y(&self) -> T {self.origin.y}#[inline]pub fn width(&self) -> T {self.size.width}#[inline]pub fn height(&self) -> T {self.size.height}#[inline]pub fn x_range(&self) -> Range<T> {self.min_x()..self.max_x()}#[inline]pub fn y_range(&self) -> Range<T> {self.min_y()..self.max_y()}/// Returns the same rectangle, translated by a vector.#[inline]#[must_use]pub fn translate(&self, by: Vector2D<T, U>) -> Self {Self::new(self.origin + by, self.size)}#[inline]pub fn to_box2d(&self) -> Box2D<T, U> {Box2D {min: self.min(),max: self.max(),}}
}impl<T, U> Rect<T, U>
whereT: Copy + PartialOrd + Add<T, Output = T>,
{/// Returns `true` if this rectangle contains the point. Points are considered/// in the rectangle if they are on the left or top edge, but outside if they/// are on the right or bottom edge.#[inline]pub fn contains(&self, p: Point2D<T, U>) -> bool {self.to_box2d().contains(p)}#[inline]pub fn intersects(&self, other: &Self) -> bool {self.to_box2d().intersects(&other.to_box2d())}
}impl<T, U> Rect<T, U>
whereT: Copy + PartialOrd + Add<T, Output = T> + Sub<T, Output = T>,
{#[inline]pub fn intersection(&self, other: &Self) -> Option<Self> {let box2d = self.to_box2d().intersection_unchecked(&other.to_box2d());if box2d.is_empty() {return None;}Some(box2d.to_rect())}
}impl<T, U> Rect<T, U>
whereT: Copy + Add<T, Output = T> + Sub<T, Output = T>,
{#[inline]#[must_use]pub fn inflate(&self, width: T, height: T) -> Self {Rect::new(Point2D::new(self.origin.x - width, self.origin.y - height),Size2D::new(self.size.width + width + width,self.size.height + height + height,),)}
}impl<T, U> Rect<T, U>
whereT: Copy + Zero + PartialOrd + Add<T, Output = T>,
{/// Returns `true` if this rectangle contains the interior of `rect`. Always/// returns `true` if `rect` is empty, and always returns `false` if `rect` is/// nonempty but this rectangle is empty.#[inline]pub fn contains_rect(&self, rect: &Self) -> bool {rect.is_empty()|| (self.min_x() <= rect.min_x()&& rect.max_x() <= self.max_x()&& self.min_y() <= rect.min_y()&& rect.max_y() <= self.max_y())}
}impl<T, U> Rect<T, U>
whereT: Copy + Zero + PartialOrd + Add<T, Output = T> + Sub<T, Output = T>,
{/// Calculate the size and position of an inner rectangle.////// Subtracts the side offsets from all sides. The horizontal and vertical/// offsets must not be larger than the original side length./// This method assumes y oriented downward.pub fn inner_rect(&self, offsets: SideOffsets2D<T, U>) -> Self {let rect = Rect::new(Point2D::new(self.origin.x + offsets.left, self.origin.y + offsets.top),Size2D::new(self.size.width - offsets.horizontal(),self.size.height - offsets.vertical(),),);debug_assert!(rect.size.width >= Zero::zero());debug_assert!(rect.size.height >= Zero::zero());rect}
}impl<T, U> Rect<T, U>
whereT: Copy + Add<T, Output = T> + Sub<T, Output = T>,
{/// Calculate the size and position of an outer rectangle.////// Add the offsets to all sides. The expanded rectangle is returned./// This method assumes y oriented downward.pub fn outer_rect(&self, offsets: SideOffsets2D<T, U>) -> Self {Rect::new(Point2D::new(self.origin.x - offsets.left, self.origin.y - offsets.top),Size2D::new(self.size.width + offsets.horizontal(),self.size.height + offsets.vertical(),),)}
}impl<T, U> Rect<T, U>
whereT: Copy + Zero + PartialOrd + Sub<T, Output = T>,
{/// Returns the smallest rectangle defined by the top/bottom/left/right-most/// points provided as parameter.////// Note: This function has a behavior that can be surprising because/// the right-most and bottom-most points are exactly on the edge/// of the rectangle while the [`Rect::contains`] function is has exclusive/// semantic on these edges. This means that the right-most and bottom-most/// points provided to [`Rect::from_points`] will count as not contained by the rect./// This behavior may change in the future.////// See [`Box2D::from_points`] for more details.pub fn from_points<I>(points: I) -> SelfwhereI: IntoIterator,I::Item: Borrow<Point2D<T, U>>,{Box2D::from_points(points).to_rect()}
}impl<T, U> Rect<T, U>
whereT: Copy + One + Add<Output = T> + Sub<Output = T> + Mul<Output = T>,
{/// Linearly interpolate between this rectangle and another rectangle.#[inline]pub fn lerp(&self, other: Self, t: T) -> Self {Self::new(self.origin.lerp(other.origin, t),self.size.lerp(other.size, t),)}
}impl<T, U> Rect<T, U>
whereT: Copy + One + Add<Output = T> + Div<Output = T>,
{pub fn center(&self) -> Point2D<T, U> {let two = T::one() + T::one();self.origin + self.size.to_vector() / two}
}impl<T, U> Rect<T, U>
whereT: Copy + PartialOrd + Add<T, Output = T> + Sub<T, Output = T> + Zero,
{#[inline]pub fn union(&self, other: &Self) -> Self {self.to_box2d().union(&other.to_box2d()).to_rect()}
}impl<T, U> Rect<T, U> {#[inline]pub fn scale<S: Copy>(&self, x: S, y: S) -> SelfwhereT: Copy + Mul<S, Output = T>,{Rect::new(Point2D::new(self.origin.x * x, self.origin.y * y),Size2D::new(self.size.width * x, self.size.height * y),)}
}impl<T: Copy + Mul<T, Output = T>, U> Rect<T, U> {#[inline]pub fn area(&self) -> T {self.size.area()}
}impl<T: Copy + Zero + PartialOrd, U> Rect<T, U> {#[inline]pub fn is_empty(&self) -> bool {self.size.is_empty()}
}impl<T: Copy + Zero + PartialOrd, U> Rect<T, U> {#[inline]pub fn to_non_empty(&self) -> Option<Self> {if self.is_empty() {return None;}Some(*self)}
}impl<T: Copy + Mul, U> Mul<T> for Rect<T, U> {type Output = Rect<T::Output, U>;#[inline]fn mul(self, scale: T) -> Self::Output {Rect::new(self.origin * scale, self.size * scale)}
}impl<T: Copy + MulAssign, U> MulAssign<T> for Rect<T, U> {#[inline]fn mul_assign(&mut self, scale: T) {*self *= Scale::new(scale);}
}impl<T: Copy + Div, U> Div<T> for Rect<T, U> {type Output = Rect<T::Output, U>;#[inline]fn div(self, scale: T) -> Self::Output {Rect::new(self.origin / scale.clone(), self.size / scale)}
}impl<T: Copy + DivAssign, U> DivAssign<T> for Rect<T, U> {#[inline]fn div_assign(&mut self, scale: T) {*self /= Scale::new(scale);}
}impl<T: Copy + Mul, U1, U2> Mul<Scale<T, U1, U2>> for Rect<T, U1> {type Output = Rect<T::Output, U2>;#[inline]fn mul(self, scale: Scale<T, U1, U2>) -> Self::Output {Rect::new(self.origin * scale.clone(), self.size * scale)}
}impl<T: Copy + MulAssign, U> MulAssign<Scale<T, U, U>> for Rect<T, U> {#[inline]fn mul_assign(&mut self, scale: Scale<T, U, U>) {self.origin *= scale.clone();self.size *= scale;}
}impl<T: Copy + Div, U1, U2> Div<Scale<T, U1, U2>> for Rect<T, U2> {type Output = Rect<T::Output, U1>;#[inline]fn div(self, scale: Scale<T, U1, U2>) -> Self::Output {Rect::new(self.origin / scale.clone(), self.size / scale)}
}impl<T: Copy + DivAssign, U> DivAssign<Scale<T, U, U>> for Rect<T, U> {#[inline]fn div_assign(&mut self, scale: Scale<T, U, U>) {self.origin /= scale.clone();self.size /= scale;}
}impl<T: Copy, U> Rect<T, U> {/// Drop the units, preserving only the numeric value.#[inline]pub fn to_untyped(&self) -> Rect<T, UnknownUnit> {Rect::new(self.origin.to_untyped(), self.size.to_untyped())}/// Tag a unitless value with units.#[inline]pub fn from_untyped(r: &Rect<T, UnknownUnit>) -> Rect<T, U> {Rect::new(Point2D::from_untyped(r.origin),Size2D::from_untyped(r.size),)}/// Cast the unit#[inline]pub fn cast_unit<V>(&self) -> Rect<T, V> {Rect::new(self.origin.cast_unit(), self.size.cast_unit())}
}impl<T: NumCast + Copy, U> Rect<T, U> {/// Cast from one numeric representation to another, preserving the units.////// When casting from floating point to integer coordinates, the decimals are truncated/// as one would expect from a simple cast, but this behavior does not always make sense/// geometrically. Consider using [`round`], [`round_in`] or [`round_out`] before casting.////// [`round`]: Self::round/// [`round_in`]: Self::round_in/// [`round_out`]: Self::round_out#[inline]pub fn cast<NewT: NumCast>(&self) -> Rect<NewT, U> {Rect::new(self.origin.cast(), self.size.cast())}/// Fallible cast from one numeric representation to another, preserving the units.////// When casting from floating point to integer coordinates, the decimals are truncated/// as one would expect from a simple cast, but this behavior does not always make sense/// geometrically. Consider using [`round`], [`round_in`] or [`round_out` before casting.////// [`round`]: Self::round/// [`round_in`]: Self::round_in/// [`round_out`]: Self::round_outpub fn try_cast<NewT: NumCast>(&self) -> Option<Rect<NewT, U>> {match (self.origin.try_cast(), self.size.try_cast()) {(Some(origin), Some(size)) => Some(Rect::new(origin, size)),_ => None,}}// Convenience functions for common casts/// Cast into an `f32` rectangle.#[inline]pub fn to_f32(&self) -> Rect<f32, U> {self.cast()}/// Cast into an `f64` rectangle.#[inline]pub fn to_f64(&self) -> Rect<f64, U> {self.cast()}/// Cast into an `usize` rectangle, truncating decimals if any.////// When casting from floating point rectangles, it is worth considering whether/// to `round()`, `round_in()` or `round_out()` before the cast in order to/// obtain the desired conversion behavior.#[inline]pub fn to_usize(&self) -> Rect<usize, U> {self.cast()}/// Cast into an `u32` rectangle, truncating decimals if any.////// When casting from floating point rectangles, it is worth considering whether/// to `round()`, `round_in()` or `round_out()` before the cast in order to/// obtain the desired conversion behavior.#[inline]pub fn to_u32(&self) -> Rect<u32, U> {self.cast()}/// Cast into an `u64` rectangle, truncating decimals if any.////// When casting from floating point rectangles, it is worth considering whether/// to `round()`, `round_in()` or `round_out()` before the cast in order to/// obtain the desired conversion behavior.#[inline]pub fn to_u64(&self) -> Rect<u64, U> {self.cast()}/// Cast into an `i32` rectangle, truncating decimals if any.////// When casting from floating point rectangles, it is worth considering whether/// to `round()`, `round_in()` or `round_out()` before the cast in order to/// obtain the desired conversion behavior.#[inline]pub fn to_i32(&self) -> Rect<i32, U> {self.cast()}/// Cast into an `i64` rectangle, truncating decimals if any.////// When casting from floating point rectangles, it is worth considering whether/// to `round()`, `round_in()` or `round_out()` before the cast in order to/// obtain the desired conversion behavior.#[inline]pub fn to_i64(&self) -> Rect<i64, U> {self.cast()}
}impl<T: Float, U> Rect<T, U> {/// Returns `true` if all members are finite.#[inline]pub fn is_finite(self) -> bool {self.origin.is_finite() && self.size.is_finite()}
}impl<T: Floor + Ceil + Round + Add<T, Output = T> + Sub<T, Output = T>, U> Rect<T, U> {/// Return a rectangle with edges rounded to integer coordinates, such that/// the returned rectangle has the same set of pixel centers as the original/// one./// Edges at offset 0.5 round up./// Suitable for most places where integral device coordinates/// are needed, but note that any translation should be applied first to/// avoid pixel rounding errors./// Note that this is *not* rounding to nearest integer if the values are negative./// They are always rounding as floor(n + 0.5).////// # Usage notes/// Note, that when using with floating-point `T` types that method can significantly/// lose precision for large values, so if you need to call this method very often it/// is better to use [`Box2D`].#[must_use]pub fn round(&self) -> Self {self.to_box2d().round().to_rect()}/// Return a rectangle with edges rounded to integer coordinates, such that/// the original rectangle contains the resulting rectangle.////// # Usage notes/// Note, that when using with floating-point `T` types that method can significantly/// lose precision for large values, so if you need to call this method very often it/// is better to use [`Box2D`].#[must_use]pub fn round_in(&self) -> Self {self.to_box2d().round_in().to_rect()}/// Return a rectangle with edges rounded to integer coordinates, such that/// the original rectangle is contained in the resulting rectangle.////// # Usage notes/// Note, that when using with floating-point `T` types that method can significantly/// lose precision for large values, so if you need to call this method very often it/// is better to use [`Box2D`].#[must_use]pub fn round_out(&self) -> Self {self.to_box2d().round_out().to_rect()}
}impl<T, U> From<Size2D<T, U>> for Rect<T, U>
whereT: Zero,
{fn from(size: Size2D<T, U>) -> Self {Self::from_size(size)}
}/// Shorthand for `Rect::new(Point2D::new(x, y), Size2D::new(w, h))`.
pub const fn rect<T, U>(x: T, y: T, w: T, h: T) -> Rect<T, U> {Rect::new(Point2D::new(x, y), Size2D::new(w, h))
}#[cfg(test)]
mod tests {use crate::default::{Point2D, Rect, Size2D};use crate::side_offsets::SideOffsets2D;use crate::{point2, rect, size2, vec2};#[test]fn test_translate() {let p = Rect::new(Point2D::new(0u32, 0u32), Size2D::new(50u32, 40u32));let pp = p.translate(vec2(10, 15));assert!(pp.size.width == 50);assert!(pp.size.height == 40);assert!(pp.origin.x == 10);assert!(pp.origin.y == 15);let r = Rect::new(Point2D::new(-10, -5), Size2D::new(50, 40));let rr = r.translate(vec2(0, -10));assert!(rr.size.width == 50);assert!(rr.size.height == 40);assert!(rr.origin.x == -10);assert!(rr.origin.y == -15);}#[test]fn test_union() {let p = Rect::new(Point2D::new(0, 0), Size2D::new(50, 40));let q = Rect::new(Point2D::new(20, 20), Size2D::new(5, 5));let r = Rect::new(Point2D::new(-15, -30), Size2D::new(200, 15));let s = Rect::new(Point2D::new(20, -15), Size2D::new(250, 200));let pq = p.union(&q);assert!(pq.origin == Point2D::new(0, 0));assert!(pq.size == Size2D::new(50, 40));let pr = p.union(&r);assert!(pr.origin == Point2D::new(-15, -30));assert!(pr.size == Size2D::new(200, 70));let ps = p.union(&s);assert!(ps.origin == Point2D::new(0, -15));assert!(ps.size == Size2D::new(270, 200));}#[test]fn test_intersection() {let p = Rect::new(Point2D::new(0, 0), Size2D::new(10, 20));let q = Rect::new(Point2D::new(5, 15), Size2D::new(10, 10));let r = Rect::new(Point2D::new(-5, -5), Size2D::new(8, 8));let pq = p.intersection(&q);assert!(pq.is_some());let pq = pq.unwrap();assert!(pq.origin == Point2D::new(5, 15));assert!(pq.size == Size2D::new(5, 5));let pr = p.intersection(&r);assert!(pr.is_some());let pr = pr.unwrap();assert!(pr.origin == Point2D::new(0, 0));assert!(pr.size == Size2D::new(3, 3));let qr = q.intersection(&r);assert!(qr.is_none());}#[test]fn test_intersection_overflow() {// test some scenarios where the intersection can overflow but// the min_x() and max_x() don't. Gecko currently fails these caseslet p = Rect::new(Point2D::new(-2147483648, -2147483648), Size2D::new(0, 0));let q = Rect::new(Point2D::new(2136893440, 2136893440),Size2D::new(279552, 279552),);let r = Rect::new(Point2D::new(-2147483648, -2147483648), Size2D::new(1, 1));assert!(p.is_empty());let pq = p.intersection(&q);assert!(pq.is_none());let qr = q.intersection(&r);assert!(qr.is_none());}#[test]fn test_contains() {let r = Rect::new(Point2D::new(-20, 15), Size2D::new(100, 200));assert!(r.contains(Point2D::new(0, 50)));assert!(r.contains(Point2D::new(-10, 200)));// The `contains` method is inclusive of the top/left edges, but not the// bottom/right edges.assert!(r.contains(Point2D::new(-20, 15)));assert!(!r.contains(Point2D::new(80, 15)));assert!(!r.contains(Point2D::new(80, 215)));assert!(!r.contains(Point2D::new(-20, 215)));// Points beyond the top-left corner.assert!(!r.contains(Point2D::new(-25, 15)));assert!(!r.contains(Point2D::new(-15, 10)));// Points beyond the top-right corner.assert!(!r.contains(Point2D::new(85, 20)));assert!(!r.contains(Point2D::new(75, 10)));// Points beyond the bottom-right corner.assert!(!r.contains(Point2D::new(85, 210)));assert!(!r.contains(Point2D::new(75, 220)));// Points beyond the bottom-left corner.assert!(!r.contains(Point2D::new(-25, 210)));assert!(!r.contains(Point2D::new(-15, 220)));let r = Rect::new(Point2D::new(-20.0, 15.0), Size2D::new(100.0, 200.0));assert!(r.contains_rect(&r));assert!(!r.contains_rect(&r.translate(vec2(0.1, 0.0))));assert!(!r.contains_rect(&r.translate(vec2(-0.1, 0.0))));assert!(!r.contains_rect(&r.translate(vec2(0.0, 0.1))));assert!(!r.contains_rect(&r.translate(vec2(0.0, -0.1))));// Empty rectangles are always considered as contained in other rectangles,// even if their origin is not.let p = Point2D::new(1.0, 1.0);assert!(!r.contains(p));assert!(r.contains_rect(&Rect::new(p, Size2D::zero())));}#[test]fn test_scale() {let p = Rect::new(Point2D::new(0u32, 0u32), Size2D::new(50u32, 40u32));let pp = p.scale(10, 15);assert!(pp.size.width == 500);assert!(pp.size.height == 600);assert!(pp.origin.x == 0);assert!(pp.origin.y == 0);let r = Rect::new(Point2D::new(-10, -5), Size2D::new(50, 40));let rr = r.scale(1, 20);assert!(rr.size.width == 50);assert!(rr.size.height == 800);assert!(rr.origin.x == -10);assert!(rr.origin.y == -100);}#[test]fn test_inflate() {let p = Rect::new(Point2D::new(0, 0), Size2D::new(10, 10));let pp = p.inflate(10, 20);assert!(pp.size.width == 30);assert!(pp.size.height == 50);assert!(pp.origin.x == -10);assert!(pp.origin.y == -20);let r = Rect::new(Point2D::new(0, 0), Size2D::new(10, 20));let rr = r.inflate(-2, -5);assert!(rr.size.width == 6);assert!(rr.size.height == 10);assert!(rr.origin.x == 2);assert!(rr.origin.y == 5);}#[test]fn test_inner_outer_rect() {let inner_rect = Rect::new(point2(20, 40), size2(80, 100));let offsets = SideOffsets2D::new(20, 10, 10, 10);let outer_rect = inner_rect.outer_rect(offsets);assert_eq!(outer_rect.origin.x, 10);assert_eq!(outer_rect.origin.y, 20);assert_eq!(outer_rect.size.width, 100);assert_eq!(outer_rect.size.height, 130);assert_eq!(outer_rect.inner_rect(offsets), inner_rect);}#[test]fn test_min_max_x_y() {let p = Rect::new(Point2D::new(0u32, 0u32), Size2D::new(50u32, 40u32));assert!(p.max_y() == 40);assert!(p.min_y() == 0);assert!(p.max_x() == 50);assert!(p.min_x() == 0);let r = Rect::new(Point2D::new(-10, -5), Size2D::new(50, 40));assert!(r.max_y() == 35);assert!(r.min_y() == -5);assert!(r.max_x() == 40);assert!(r.min_x() == -10);}#[test]fn test_width_height() {let r = Rect::new(Point2D::new(-10, -5), Size2D::new(50, 40));assert!(r.width() == 50);assert!(r.height() == 40);}#[test]fn test_is_empty() {assert!(Rect::new(Point2D::new(0u32, 0u32), Size2D::new(0u32, 0u32)).is_empty());assert!(Rect::new(Point2D::new(0u32, 0u32), Size2D::new(10u32, 0u32)).is_empty());assert!(Rect::new(Point2D::new(0u32, 0u32), Size2D::new(0u32, 10u32)).is_empty());assert!(!Rect::new(Point2D::new(0u32, 0u32), Size2D::new(1u32, 1u32)).is_empty());assert!(Rect::new(Point2D::new(10u32, 10u32), Size2D::new(0u32, 0u32)).is_empty());assert!(Rect::new(Point2D::new(10u32, 10u32), Size2D::new(10u32, 0u32)).is_empty());assert!(Rect::new(Point2D::new(10u32, 10u32), Size2D::new(0u32, 10u32)).is_empty());assert!(!Rect::new(Point2D::new(10u32, 10u32), Size2D::new(1u32, 1u32)).is_empty());}#[test]fn test_round() {let mut x = -2.0;let mut y = -2.0;let mut w = -2.0;let mut h = -2.0;while x < 2.0 {while y < 2.0 {while w < 2.0 {while h < 2.0 {let rect = Rect::new(Point2D::new(x, y), Size2D::new(w, h));assert!(rect.contains_rect(&rect.round_in()));assert!(rect.round_in().inflate(1.0, 1.0).contains_rect(&rect));assert!(rect.round_out().contains_rect(&rect));assert!(rect.inflate(1.0, 1.0).contains_rect(&rect.round_out()));assert!(rect.inflate(1.0, 1.0).contains_rect(&rect.round()));assert!(rect.round().inflate(1.0, 1.0).contains_rect(&rect));h += 0.1;}w += 0.1;}y += 0.1;}x += 0.1;}}#[test]fn test_center() {let r: Rect<i32> = rect(-2, 5, 4, 10);assert_eq!(r.center(), point2(0, 10));let r: Rect<f32> = rect(1.0, 2.0, 3.0, 4.0);assert_eq!(r.center(), point2(2.5, 4.0));}#[test]fn test_nan() {let r1: Rect<f32> = rect(-2.0, 5.0, 4.0, std::f32::NAN);let r2: Rect<f32> = rect(std::f32::NAN, -1.0, 3.0, 10.0);assert_eq!(r1.intersection(&r2), None);}
}