packer-3d 0.2.3

Packing algorithm for 3D container packing which optimizes for width, height, length, or all three.
Documentation 
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//! Sorting functions used by [PackerInstance](crate::PackerInstance)

use crate::box3d::Box3D;

use std::cmp::Ordering;
use Ordering::{
	Greater,
	Less,
	Equal,
};

pub struct Sorting {}

impl Sorting {
	pub fn descending_volume(a: &Box3D, b: &Box3D) -> Ordering // return 1 if b is before a (switch a and b), -1 otherwise
	{
		let bv = b.volume();
		let av = a.volume();

		if bv > av { return Greater; }
		if bv != av { return Less; }

		if b.size.z > a.size.z { return Greater; }
		if b.size.z != a.size.z { return Less; }

		if b.size.x > a.size.x { return Greater; }
		if b.size.x != a.size.x { return Less; }

		if b.size.y > a.size.y { return Greater; }
		if b.size.y != a.size.y { return Less; }

		if b.id < a.id { return Greater; }

		Equal
	}
	pub fn ascending_volume(a: &Box3D, b: &Box3D) -> Ordering
	{
		Self::descending_volume(b, a)
	}

	pub fn descending_width(a: &Box3D, b: &Box3D) -> Ordering
	{
		if b.size.x > a.size.x { return Greater; }
		if b.size.x != a.size.x { return Less; }

		let bv = b.volume();
		let av = a.volume();

		if bv > av { return Greater; }
		if bv != av { return Less; }

		if b.size.z > a.size.z { return Greater; }
		if b.size.z != a.size.z { return Less; }
		
		if b.size.y > a.size.y { return Greater; }
		if b.size.y != a.size.y { return Less; }

		if b.id < a.id { return Greater; }

		Equal
	}
	pub fn ascending_width(a: &Box3D, b: &Box3D) -> Ordering
	{
		Self::descending_width(b, a)
	}

	pub fn descending_height(a: &Box3D, b: &Box3D) -> Ordering
	{
		if b.size.y > a.size.y { return Greater; }
		if b.size.y != a.size.y { return Less; }
		
		let bv = b.volume();
		let av = a.volume();

		if bv > av { return Greater; }
		if bv != av { return Less; }

		if b.size.z > a.size.z { return Greater; }
		if b.size.z != a.size.z { return Less; }
		
		if b.size.x > a.size.x { return Greater; }
		if b.size.x != a.size.x { return Less; }

		if b.id < a.id { return Greater; }

		Equal
	}
	pub fn ascending_height(a: &Box3D, b: &Box3D) -> Ordering
	{
		Self::descending_height(b, a)
	}

	pub fn descending_length(a: &Box3D, b: &Box3D) -> Ordering
	{
		if b.size.z > a.size.z { return Greater; }
		if b.size.z != a.size.z { return Less; }
		
		let bv = b.volume();
		let av = a.volume();
		
		if bv > av { return Greater; }
		if bv != av { return Less; }

		if b.size.x > a.size.x { return Greater; }
		if b.size.x != a.size.x { return Less; }
		
		if b.size.y > a.size.y { return Greater; }
		if b.size.y != a.size.y { return Less; }

		if b.id < a.id { return Greater; }

		Equal
	}
	pub fn ascending_length(a: &Box3D, b: &Box3D) -> Ordering
	{
		Self::descending_length(b, a)
	}

	pub fn descending_id(a: &Box3D, b: &Box3D) -> Ordering
	{
		if b.id < a.id { return Greater; }

		Equal
	}
	pub fn ascending_id(a: &Box3D, b: &Box3D) -> Ordering
	{
		Self::descending_id(b, a)
	}

	/// Gets the sorting function from a string slice
	pub fn get(name: &str) -> &'static dyn Fn(&Box3D,&Box3D) -> Ordering
	{
		match name
		{
			"Descending Volume" => &Sorting::descending_volume,
			"Ascending Volume" => &Sorting::ascending_volume,

			"Descending Width" => &Sorting::descending_width,
			"Ascending Width" => &Sorting::ascending_width,

			"Descending Height" => &Sorting::descending_height,
			"Ascending Height" => &Sorting::ascending_height,

			"Descending Length" => &Sorting::descending_length,
			"Ascending Length" => &Sorting::ascending_length,

			"Descending Id" => &Sorting::descending_id,
			"Ascending Id" => &Sorting::ascending_id,

			_ => &Sorting::descending_volume,
		}
	}
}