boxdd-sys 0.4.0

Low-level FFI bindings for Box2D built from upstream via submodule
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49

// SPDX-FileCopyrightText: 2023 Erin Catto
// SPDX-License-Identifier: MIT

#pragma once

#include "box2d/types.h"

// Ray cast an AABB
b2CastOutput b2AABB_RayCast( b2AABB a, b2Vec2 p1, b2Vec2 p2 );

// Get surface area of an AABB (the perimeter length)
static inline float b2Perimeter( b2AABB a )
{
	float wx = a.upperBound.x - a.lowerBound.x;
	float wy = a.upperBound.y - a.lowerBound.y;
	return 2.0f * ( wx + wy );
}

/// Enlarge a to contain b
/// @return true if the AABB grew
static inline bool b2EnlargeAABB( b2AABB* a, b2AABB b )
{
	bool changed = false;
	if ( b.lowerBound.x < a->lowerBound.x )
	{
		a->lowerBound.x = b.lowerBound.x;
		changed = true;
	}

	if ( b.lowerBound.y < a->lowerBound.y )
	{
		a->lowerBound.y = b.lowerBound.y;
		changed = true;
	}

	if ( a->upperBound.x < b.upperBound.x )
	{
		a->upperBound.x = b.upperBound.x;
		changed = true;
	}

	if ( a->upperBound.y < b.upperBound.y )
	{
		a->upperBound.y = b.upperBound.y;
		changed = true;
	}

	return changed;
}