527 lines
13 KiB
Rust
527 lines
13 KiB
Rust
// Copyright 2013 The Servo Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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//! A group of side offsets, which correspond to top/left/bottom/right for borders, padding,
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//! and margins in CSS.
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use crate::length::Length;
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use crate::num::Zero;
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use crate::scale::Scale;
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use crate::Vector2D;
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use core::cmp::{Eq, PartialEq};
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use core::fmt;
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use core::hash::Hash;
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use core::marker::PhantomData;
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use core::ops::{Add, AddAssign, Div, DivAssign, Mul, MulAssign, Neg, Sub, SubAssign};
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#[cfg(feature = "bytemuck")]
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use bytemuck::{Pod, Zeroable};
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#[cfg(feature = "serde")]
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use serde::{Deserialize, Serialize};
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/// A group of 2D side offsets, which correspond to top/right/bottom/left for borders, padding,
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/// and margins in CSS, optionally tagged with a unit.
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#[repr(C)]
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#[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
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#[cfg_attr(
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feature = "serde",
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serde(bound(serialize = "T: Serialize", deserialize = "T: Deserialize<'de>"))
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)]
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pub struct SideOffsets2D<T, U> {
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pub top: T,
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pub right: T,
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pub bottom: T,
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pub left: T,
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#[doc(hidden)]
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pub _unit: PhantomData<U>,
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}
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#[cfg(feature = "arbitrary")]
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impl<'a, T, U> arbitrary::Arbitrary<'a> for SideOffsets2D<T, U>
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where
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T: arbitrary::Arbitrary<'a>,
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{
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fn arbitrary(u: &mut arbitrary::Unstructured<'a>) -> arbitrary::Result<Self> {
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let (top, right, bottom, left) = arbitrary::Arbitrary::arbitrary(u)?;
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Ok(SideOffsets2D {
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top,
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right,
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bottom,
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left,
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_unit: PhantomData,
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})
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}
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}
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#[cfg(feature = "bytemuck")]
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unsafe impl<T: Zeroable, U> Zeroable for SideOffsets2D<T, U> {}
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#[cfg(feature = "bytemuck")]
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unsafe impl<T: Pod, U: 'static> Pod for SideOffsets2D<T, U> {}
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impl<T: Copy, U> Copy for SideOffsets2D<T, U> {}
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impl<T: Clone, U> Clone for SideOffsets2D<T, U> {
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fn clone(&self) -> Self {
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SideOffsets2D {
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top: self.top.clone(),
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right: self.right.clone(),
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bottom: self.bottom.clone(),
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left: self.left.clone(),
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_unit: PhantomData,
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}
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}
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}
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impl<T, U> Eq for SideOffsets2D<T, U> where T: Eq {}
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impl<T, U> PartialEq for SideOffsets2D<T, U>
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where
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T: PartialEq,
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{
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fn eq(&self, other: &Self) -> bool {
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self.top == other.top
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&& self.right == other.right
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&& self.bottom == other.bottom
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&& self.left == other.left
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}
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}
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impl<T, U> Hash for SideOffsets2D<T, U>
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where
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T: Hash,
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{
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fn hash<H: core::hash::Hasher>(&self, h: &mut H) {
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self.top.hash(h);
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self.right.hash(h);
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self.bottom.hash(h);
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self.left.hash(h);
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}
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}
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impl<T: fmt::Debug, U> fmt::Debug for SideOffsets2D<T, U> {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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write!(
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f,
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"({:?},{:?},{:?},{:?})",
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self.top, self.right, self.bottom, self.left
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)
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}
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}
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impl<T: Default, U> Default for SideOffsets2D<T, U> {
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fn default() -> Self {
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SideOffsets2D {
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top: Default::default(),
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right: Default::default(),
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bottom: Default::default(),
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left: Default::default(),
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_unit: PhantomData,
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}
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}
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}
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impl<T, U> SideOffsets2D<T, U> {
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/// Constructor taking a scalar for each side.
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///
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/// Sides are specified in top-right-bottom-left order following
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/// CSS's convention.
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pub const fn new(top: T, right: T, bottom: T, left: T) -> Self {
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SideOffsets2D {
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top,
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right,
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bottom,
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left,
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_unit: PhantomData,
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}
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}
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/// Constructor taking a typed Length for each side.
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///
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/// Sides are specified in top-right-bottom-left order following
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/// CSS's convention.
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pub fn from_lengths(
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top: Length<T, U>,
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right: Length<T, U>,
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bottom: Length<T, U>,
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left: Length<T, U>,
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) -> Self {
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SideOffsets2D::new(top.0, right.0, bottom.0, left.0)
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}
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/// Construct side offsets from min and a max vector offsets.
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///
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/// The outer rect of the resulting side offsets is equivalent to translating
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/// a rectangle's upper-left corner with the min vector and translating the
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/// bottom-right corner with the max vector.
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pub fn from_vectors_outer(min: Vector2D<T, U>, max: Vector2D<T, U>) -> Self
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where
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T: Neg<Output = T>,
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{
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SideOffsets2D {
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left: -min.x,
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top: -min.y,
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right: max.x,
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bottom: max.y,
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_unit: PhantomData,
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}
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}
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/// Construct side offsets from min and a max vector offsets.
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///
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/// The inner rect of the resulting side offsets is equivalent to translating
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/// a rectangle's upper-left corner with the min vector and translating the
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/// bottom-right corner with the max vector.
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pub fn from_vectors_inner(min: Vector2D<T, U>, max: Vector2D<T, U>) -> Self
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where
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T: Neg<Output = T>,
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{
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SideOffsets2D {
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left: min.x,
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top: min.y,
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right: -max.x,
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bottom: -max.y,
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_unit: PhantomData,
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}
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}
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/// Constructor, setting all sides to zero.
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pub fn zero() -> Self
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where
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T: Zero,
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{
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SideOffsets2D::new(Zero::zero(), Zero::zero(), Zero::zero(), Zero::zero())
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}
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/// Returns `true` if all side offsets are zero.
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pub fn is_zero(&self) -> bool
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where
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T: Zero + PartialEq,
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{
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let zero = T::zero();
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self.top == zero && self.right == zero && self.bottom == zero && self.left == zero
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}
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/// Constructor setting the same value to all sides, taking a scalar value directly.
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pub fn new_all_same(all: T) -> Self
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where
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T: Copy,
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{
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SideOffsets2D::new(all, all, all, all)
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}
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/// Constructor setting the same value to all sides, taking a typed Length.
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pub fn from_length_all_same(all: Length<T, U>) -> Self
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where
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T: Copy,
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{
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SideOffsets2D::new_all_same(all.0)
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}
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pub fn horizontal(&self) -> T
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where
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T: Copy + Add<T, Output = T>,
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{
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self.left + self.right
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}
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pub fn vertical(&self) -> T
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where
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T: Copy + Add<T, Output = T>,
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{
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self.top + self.bottom
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}
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}
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impl<T, U> Add for SideOffsets2D<T, U>
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where
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T: Add<T, Output = T>,
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{
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type Output = Self;
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fn add(self, other: Self) -> Self {
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SideOffsets2D::new(
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self.top + other.top,
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self.right + other.right,
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self.bottom + other.bottom,
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self.left + other.left,
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)
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}
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}
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impl<T, U> AddAssign<Self> for SideOffsets2D<T, U>
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where
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T: AddAssign<T>,
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{
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fn add_assign(&mut self, other: Self) {
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self.top += other.top;
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self.right += other.right;
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self.bottom += other.bottom;
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self.left += other.left;
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}
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}
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impl<T, U> Sub for SideOffsets2D<T, U>
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where
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T: Sub<T, Output = T>,
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{
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type Output = Self;
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fn sub(self, other: Self) -> Self {
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SideOffsets2D::new(
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self.top - other.top,
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self.right - other.right,
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self.bottom - other.bottom,
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self.left - other.left,
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)
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}
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}
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impl<T, U> SubAssign<Self> for SideOffsets2D<T, U>
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where
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T: SubAssign<T>,
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{
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fn sub_assign(&mut self, other: Self) {
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self.top -= other.top;
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self.right -= other.right;
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self.bottom -= other.bottom;
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self.left -= other.left;
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}
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}
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impl<T, U> Neg for SideOffsets2D<T, U>
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where
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T: Neg<Output = T>,
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{
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type Output = Self;
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fn neg(self) -> Self {
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SideOffsets2D {
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top: -self.top,
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right: -self.right,
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bottom: -self.bottom,
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left: -self.left,
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_unit: PhantomData,
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}
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}
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}
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impl<T: Copy + Mul, U> Mul<T> for SideOffsets2D<T, U> {
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type Output = SideOffsets2D<T::Output, U>;
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#[inline]
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fn mul(self, scale: T) -> Self::Output {
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SideOffsets2D::new(
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self.top * scale,
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self.right * scale,
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self.bottom * scale,
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self.left * scale,
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)
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}
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}
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impl<T: Copy + MulAssign, U> MulAssign<T> for SideOffsets2D<T, U> {
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#[inline]
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fn mul_assign(&mut self, other: T) {
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self.top *= other;
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self.right *= other;
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self.bottom *= other;
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self.left *= other;
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}
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}
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impl<T: Copy + Mul, U1, U2> Mul<Scale<T, U1, U2>> for SideOffsets2D<T, U1> {
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type Output = SideOffsets2D<T::Output, U2>;
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#[inline]
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fn mul(self, scale: Scale<T, U1, U2>) -> Self::Output {
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SideOffsets2D::new(
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self.top * scale.0,
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self.right * scale.0,
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self.bottom * scale.0,
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self.left * scale.0,
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)
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}
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}
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impl<T: Copy + MulAssign, U> MulAssign<Scale<T, U, U>> for SideOffsets2D<T, U> {
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#[inline]
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fn mul_assign(&mut self, other: Scale<T, U, U>) {
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*self *= other.0;
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}
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}
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impl<T: Copy + Div, U> Div<T> for SideOffsets2D<T, U> {
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type Output = SideOffsets2D<T::Output, U>;
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#[inline]
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fn div(self, scale: T) -> Self::Output {
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SideOffsets2D::new(
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self.top / scale,
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self.right / scale,
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self.bottom / scale,
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self.left / scale,
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)
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}
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}
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impl<T: Copy + DivAssign, U> DivAssign<T> for SideOffsets2D<T, U> {
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#[inline]
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fn div_assign(&mut self, other: T) {
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self.top /= other;
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self.right /= other;
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self.bottom /= other;
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self.left /= other;
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}
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}
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impl<T: Copy + Div, U1, U2> Div<Scale<T, U1, U2>> for SideOffsets2D<T, U2> {
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type Output = SideOffsets2D<T::Output, U1>;
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#[inline]
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fn div(self, scale: Scale<T, U1, U2>) -> Self::Output {
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SideOffsets2D::new(
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self.top / scale.0,
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self.right / scale.0,
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self.bottom / scale.0,
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self.left / scale.0,
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)
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}
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}
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impl<T: Copy + DivAssign, U> DivAssign<Scale<T, U, U>> for SideOffsets2D<T, U> {
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fn div_assign(&mut self, other: Scale<T, U, U>) {
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*self /= other.0;
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}
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}
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#[test]
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fn from_vectors() {
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use crate::{point2, vec2};
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type Box2D = crate::default::Box2D<i32>;
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let b = Box2D {
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min: point2(10, 10),
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max: point2(20, 20),
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};
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let outer = b.outer_box(SideOffsets2D::from_vectors_outer(vec2(-1, -2), vec2(3, 4)));
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let inner = b.inner_box(SideOffsets2D::from_vectors_inner(vec2(1, 2), vec2(-3, -4)));
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assert_eq!(
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outer,
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Box2D {
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min: point2(9, 8),
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max: point2(23, 24)
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}
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);
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assert_eq!(
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inner,
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Box2D {
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min: point2(11, 12),
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max: point2(17, 16)
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}
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);
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}
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#[test]
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fn test_is_zero() {
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let s1: SideOffsets2D<f32, ()> = SideOffsets2D::new_all_same(0.0);
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assert!(s1.is_zero());
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let s2: SideOffsets2D<f32, ()> = SideOffsets2D::new(1.0, 2.0, 3.0, 4.0);
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assert!(!s2.is_zero());
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}
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#[cfg(test)]
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mod ops {
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use crate::Scale;
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pub enum Mm {}
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pub enum Cm {}
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type SideOffsets2D<T> = crate::default::SideOffsets2D<T>;
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type SideOffsets2DMm<T> = crate::SideOffsets2D<T, Mm>;
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type SideOffsets2DCm<T> = crate::SideOffsets2D<T, Cm>;
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#[test]
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fn test_mul_scalar() {
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let s = SideOffsets2D::new(1.0, 2.0, 3.0, 4.0);
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let result = s * 3.0;
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assert_eq!(result, SideOffsets2D::new(3.0, 6.0, 9.0, 12.0));
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}
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#[test]
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fn test_mul_assign_scalar() {
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let mut s = SideOffsets2D::new(1.0, 2.0, 3.0, 4.0);
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s *= 2.0;
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assert_eq!(s, SideOffsets2D::new(2.0, 4.0, 6.0, 8.0));
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}
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#[test]
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fn test_mul_scale() {
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let s = SideOffsets2DMm::new(0.0, 1.0, 3.0, 2.0);
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let cm_per_mm: Scale<f32, Mm, Cm> = Scale::new(0.1);
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let result = s * cm_per_mm;
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assert_eq!(result, SideOffsets2DCm::new(0.0, 0.1, 0.3, 0.2));
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}
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#[test]
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fn test_mul_assign_scale() {
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let mut s = SideOffsets2DMm::new(2.0, 4.0, 6.0, 8.0);
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let scale: Scale<f32, Mm, Mm> = Scale::new(0.1);
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s *= scale;
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assert_eq!(s, SideOffsets2DMm::new(0.2, 0.4, 0.6, 0.8));
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}
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#[test]
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fn test_div_scalar() {
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let s = SideOffsets2D::new(10.0, 20.0, 30.0, 40.0);
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let result = s / 10.0;
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assert_eq!(result, SideOffsets2D::new(1.0, 2.0, 3.0, 4.0));
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}
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#[test]
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fn test_div_assign_scalar() {
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let mut s = SideOffsets2D::new(10.0, 20.0, 30.0, 40.0);
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s /= 10.0;
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assert_eq!(s, SideOffsets2D::new(1.0, 2.0, 3.0, 4.0));
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}
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#[test]
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fn test_div_scale() {
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let s = SideOffsets2DCm::new(0.1, 0.2, 0.3, 0.4);
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let cm_per_mm: Scale<f32, Mm, Cm> = Scale::new(0.1);
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let result = s / cm_per_mm;
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assert_eq!(result, SideOffsets2DMm::new(1.0, 2.0, 3.0, 4.0));
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}
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#[test]
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fn test_div_assign_scale() {
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let mut s = SideOffsets2DMm::new(0.1, 0.2, 0.3, 0.4);
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let scale: Scale<f32, Mm, Mm> = Scale::new(0.1);
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s /= scale;
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assert_eq!(s, SideOffsets2DMm::new(1.0, 2.0, 3.0, 4.0));
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}
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}
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