2d axis aligned bounding box (AABB)

Header: cglm/aabb2d.h

Some convenient functions provided for AABB.

Definition of aabb:

cglm defines an aabb as a two dimensional array of vec2’s. The first element is the min point and the second one is the max point. If you have another type e.g. struct or even another representation then you must convert it before and after calling a cglm aabb2d function.

Table of contents (click to go):

Functions:

1. glm_aabb2d_copy()

2. glm_aabb2d_transform()

3. glm_aabb2d_merge()

4. glm_aabb2d_crop()

5. glm_aabb2d_crop_until()

6. glm_aabb2d_invalidate()

7. glm_aabb2d_isvalid()

8. glm_aabb2d_size()

9. glm_aabb2d_radius()

10. glm_aabb2d_center()

11. glm_aabb2d_aabb()

12. glm_aabb2d_circle()

13. glm_aabb2d_point()

14. glm_aabb2d_contains()

Functions documentation

void glm_aabb2d_copy(vec2 aabb[2], vec2 dest[2])

copy all members of [aabb] to [dest]

Parameters:

[in] aabb bounding box

[out] dest destination

void glm_aabb2d_transform(vec2 aabb[2], mat3 m, vec2 dest[2])

apply transform to Axis-Aligned Bounding Box

Parameters:

[in] aabb bounding box

[in] m transform matrix

[out] dest transformed bounding box

void glm_aabb2d_merge(vec2 aabb1[2], vec2 aabb2[2], vec2 dest[2])

merges two AABB bounding box and creates new one

two aabb must be in the same space

Parameters:

[in] aabb1 bounding box 1

[in] aabb2 bounding box 2

[out] dest merged bounding box

void glm_aabb2d_crop(vec2 aabb[2], vec2 cropAabb[2], vec2 dest[2])

crops a bounding box with another one.

this could be useful for gettng a bbox which fits with view frustum and object bounding boxes. In this case you crop view frustum box with objects box

Parameters:

[in] aabb bounding box 1

[in] cropAabb crop box

[out] dest cropped bounding box

void glm_aabb2d_crop_until(vec2 aabb[2], vec2 cropAabb[2], vec2 clampAabb[2], vec2 dest[2])

crops a bounding box with another one.

this could be useful for gettng a bbox which fits with view frustum and object bounding boxes. In this case you crop view frustum box with objects box

Parameters:

[in] aabb bounding box

[in] cropAabb crop box

[in] clampAabb miniumum box

[out] dest cropped bounding box

void glm_aabb2d_invalidate(vec2 aabb[2])

invalidate AABB min and max values

It fills max values with -FLT_MAX and min values with +FLT_MAX

Parameters:

[in, out] aabb bounding box

bool glm_aabb2d_isvalid(vec2 aabb[2])

check if AABB is valid or not

Parameters:

[in] aabb bounding box

Returns:

returns true if aabb is valid otherwise false

float glm_aabb2d_size(vec2 aabb[2])

distance between of min and max

Parameters:

[in] aabb bounding box

Returns:

distance between min - max

float glm_aabb2d_radius(vec2 aabb[2])

radius of sphere which surrounds AABB

Parameters:

[in] aabb bounding box

void glm_aabb2d_center(vec2 aabb[2], vec2 dest)

computes center point of AABB

Parameters:

[in] aabb bounding box

[out] dest center of bounding box

bool glm_aabb2d_aabb(vec2 aabb[2], vec2 other[2])

check if two AABB intersects

Parameters:

[in] aabb bounding box

[out] other other bounding box

bool glm_aabb2d_circle(vec2 aabb[2], vec3 c)

check if AABB intersects with sphere

https://github.com/erich666/GraphicsGems/blob/master/gems/BoxSphere.c

Solid Box - Solid Sphere test.

Parameters:

[in] aabb solid bounding box

[out] c solid circle

bool glm_aabb2d_point(vec2 aabb[2], vec2 point)

check if point is inside of AABB

Parameters:

[in] aabb bounding box

[out] point point

bool glm_aabb2d_contains(vec2 aabb[2], vec2 other[2])

check if AABB contains other AABB

Parameters:

[in] aabb bounding box

[out] other other bounding box