Struct Rect2

Source

#[repr(C)]pub struct Rect2 {
    pub position: Vector2,
    pub size: Vector2,
}

Expand description

2D axis-aligned bounding box.

Rect2 consists of a position, a size, and several utility functions. It is typically used for fast overlap tests.

The 3D counterpart to Rect2 is Aabb.

Fields§

§position: Vector2

The rectangle’s position in 2D space.

§size: Vector2

Width and height.

Implementations§

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impl Rect2

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pub fn new(position: Vector2, size: Vector2) -> Self

Creates a Rect2 by position and size.

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pub fn from_components(x: f32, y: f32, width: f32, height: f32) -> Self

Creates a Rect2 by x, y, width, and height.

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pub fn end(self) -> Vector2

Ending corner. This is calculated as position + size.

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pub fn set_end(&mut self, new_end: Vector2)

Ending corner. Setting this value will change the size.

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pub fn abs(self) -> Self

Returns a rectangle with equivalent position and area, modified so that the top-left corner is the origin and width and height are positive.

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pub fn area(self) -> f32

Returns the area of the rectangle. See also has_no_area.

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pub fn has_no_area(self) -> bool

Returns true if the rectangle is flat or empty. See also area.

Note: If the Rect2 has a negative size and is not flat or empty, this method will return true. Use abs to make the size positive.

§Example

let rect = Rect2::new(
    Vector2::new(2.0, 3.0),
    Vector2::new(-3.0, -4.0),
);
assert!(rect.has_no_area());
assert!(!rect.abs().has_no_area());

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pub fn contains_point(self, point: Vector2) -> bool

Returns true if the rectangle contains a point. By convention, the right and bottom edges of the rectangle are considered exclusive, so points on these edges are not included.

Note: This method is not reliable for Rect2 with a negative size. Use abs to get a positive sized equivalent rectangle to check for contained points.

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pub fn is_equal_approx(self, b: Self) -> bool

Returns true if this rectangle and b are approximately equal, by calling is_equal_approx on each component.

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pub fn intersects(self, b: Self) -> bool

Returns true if the inside of the rectangle overlaps with b (i.e. they have at least one point in common).

This excludes borders. See intersects_including_borders for inclusive check.

Note: This method is not reliable for Rect2 with a negative size. Use abs to get a positive sized equivalent rectangle to check for intersections.

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pub fn intersects_including_borders(self, b: Self) -> bool

Returns true if the rectangle overlaps with b (i.e. they have at least one point in common) or their borders touch even without intersection.

This includes borders. See intersects for exclusive check.

Note: This method is not reliable for Rect2 with a negative size. Use abs to get a positive sized equivalent rectangle to check for intersections.

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pub fn encloses(self, b: Self) -> bool

Returns true if this rectangle (inclusively) encloses b.

This is true when self covers all the area of b, and possibly (but not necessarily) more.

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pub fn intersection(self, b: Self) -> Option<Self>

Returns the intersection of this rectangle and b, or None if they don’t intersect.

This is similar to the GDScript clip function, but returns None instead of self if there is no intersection. This method excludes borders just like intersects.

Note: This method is not reliable for Rect2 with a negative size. Use abs to get a positive sized equivalent rectangle for clipping.

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pub fn merge(self, b: Self) -> Self

Returns a larger rectangle that contains this Rect2 and b.

Note: This method is not reliable for Rect2 with a negative size. Use abs to get a positive sized equivalent rectangle for merging.

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pub fn expand(self, to: Vector2) -> Self

Returns a copy of this rectangle expanded to include a given point.

Note: This method is not reliable for Rect2 with a negative size. Use abs to get a positive sized equivalent rectangle for expanding.

§Example

let rect = Rect2::new(
    Vector2::new(-3.0, 2.0),
    Vector2::new(1.0, 1.0),
);

let rect2 = rect.expand(Vector2::new(0.0, -1.0));

assert_eq!(rect2.position, Vector2::new(-3.0, -1.0));
assert_eq!(rect2.size, Vector2::new(3.0, 4.0));