Box2

2D axis-aligned bounding box stored as [minX, minY, maxX, maxY]. Functions modify the first argument in-place unless noted.

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Functions Reference

Creation

Function	Returns	Description
box2_create(minVec, maxVec)	Array	Creates a new Box2. Defaults to empty inverted bounds.
box2_set(b, minVec, maxVec)	-	Sets bounds directly.

Operations

Function	Returns	Description
box2_expand_by_point(b, x, y)	-	Expands the box to include the point.
box2_contains_point(b, x, y)	boolean	Returns true if point is inside the box.
box2_intersects_box(b, b2)	boolean	Returns true if boxes intersect.
box2_copy(b, src)	-	Copies bounds from src.
box2_clone(b)	Array	Returns copy [minX,minY,maxX,maxY].
box2_contains_box(b, b2)	boolean	Returns true if b fully contains b2.
box2_equals(b, b2)	boolean	Strict equality on all components.
box2_clamp_point(b, x, y, out?)	Vector2	Clamps point to box boundaries.
box2_distance_to_point(b, x, y)	number	Euclidean distance to the box (0 if inside).
box2_expand_by_scalar(b, s)	-	Expands bounds by scalar in all directions.
box2_expand_by_vector(b, v)	-	Expands bounds by vector [x,y] in both directions.
box2_get_center(b, out?)	Vector2	Returns center point.
box2_get_size(b, out?)	Vector2	Returns width/height.
box2_get_parameter(b, p, out?)	Vector2	Returns normalized coordinates within the box.
box2_is_empty(b)	boolean	True if minX > maxX or minY > maxY.
box2_make_empty(b)	-	Sets to empty ([inf,inf,-inf,-inf]).
box2_intersect(b, b2)	Box2	Sets b to overlap with b2 (or empty if none).
box2_union(b, b2)	Box2	Sets b to the union of both boxes.
box2_translate(b, offset)	-	Moves box by offset.
box2_set_from_center_and_size(b, center, size)	Box2	Sets from center [x,y] and size [w,h].
box2_set_from_points(b, points)	Box2	Sets to enclose array of points [x,y].

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Usage Examples

var b = box2_create();
box2_set(b, 0, 0, 10, 10);

box2_expand_by_point(b, 12, 5);     // b = [0, 0, 12, 10]
var inside = box2_contains_point(b, 6, 6); // true