Rect2

A 2D axis-aligned bounding box using floating-point coordinates.

描述

The Rect2 built-in Variant type represents an axis-aligned rectangle in a 2D space. It is defined by its position and size, which are Vector2. It is frequently used for fast overlap tests (see intersects). Although Rect2 itself is axis-aligned, it can be combined with Transform2D to represent a rotated or skewed rectangle.

For integer coordinates, use Rect2i. The 3D equivalent to Rect2 is AABB.

Note: Negative values for size are not supported. With negative size, most Rect2 methods do not work correctly. Use abs to get an equivalent Rect2 with a non-negative size.

Note: In a boolean context, a Rect2 evaluates to false if both position and size are zero (equal to Vector2.ZERO). Otherwise, it always evaluates to true.

通过 C# 使用该 API 时会有显著不同，详见 :ref:doc_c_sharp_differences\ 。

属性

构造函数

方法

运算符

属性说明

Vector2 end = Vector2(0, 0)

The ending point. This is usually the bottom-right corner of the rectangle, and is equivalent to position + size. Setting this point affects the size.

Vector2 position = Vector2(0, 0)

The origin point. This is usually the top-left corner of the rectangle.

Vector2 size = Vector2(0, 0)

The rectangle's width and height, starting from position. Setting this value also affects the end point.

Note: It's recommended setting the width and height to non-negative values, as most methods in Godot assume that the position is the top-left corner, and the end is the bottom-right corner. To get an equivalent rectangle with non-negative size, use abs.

构造函数说明

Rect2 Rect2 ( )

Constructs a Rect2 with its position and size set to Vector2.ZERO.

Rect2 Rect2 ( from: Rect2 )

Constructs a Rect2 as a copy of the given Rect2.

Rect2 Rect2 ( from: Rect2i )

Constructs a Rect2 from a Rect2i.

Rect2 Rect2 ( position: Vector2, size: Vector2 )

Constructs a Rect2 by position and size.

Rect2 Rect2 ( x: float, y: float, width: float, height: float )

Constructs a Rect2 by setting its position to (x, y), and its size to (width, height).

方法说明

Rect2 abs ( ) const¹

Returns a Rect2 equivalent to this rectangle, with its width and height modified to be non-negative values, and with its position being the top-left corner of the rectangle.

    var rect = Rect2(25, 25, -100, -50)
    var absolute = rect.abs() # absolute is Rect2(-75, -25, 100, 50)

    var rect = new Rect2(25, 25, -100, -50);
    var absolute = rect.Abs(); // absolute is Rect2(-75, -25, 100, 50)

Note: It's recommended to use this method when size is negative, as most other methods in Godot assume that the position is the top-left corner, and the end is the bottom-right corner.

bool encloses ( b: Rect2 ) const¹

Returns true if this rectangle completely encloses the b rectangle.

Rect2 expand ( to: Vector2 ) const¹

Returns a copy of this rectangle expanded to align the edges with the given to point, if necessary.

    var rect = Rect2(0, 0, 5, 2)
    
    rect = rect.expand(Vector2(10, 0)) # rect is Rect2(0, 0, 10, 2)
    rect = rect.expand(Vector2(-5, 5)) # rect is Rect2(-5, 0, 15, 5)

    var rect = new Rect2(0, 0, 5, 2);
    
    rect = rect.Expand(new Vector2(10, 0)); // rect is Rect2(0, 0, 10, 2)
    rect = rect.Expand(new Vector2(-5, 5)); // rect is Rect2(-5, 0, 15, 5)

float get_area ( ) const¹

Returns the rectangle's area. This is equivalent to size.x * size.y. See also has_area.

Vector2 get_center ( ) const¹

Returns the center point of the rectangle. This is the same as position + (size / 2.0).

Vector2 get_support ( direction: Vector2 ) const¹

Returns the vertex's position of this rect that's the farthest in the given direction. This point is commonly known as the support point in collision detection algorithms.

Rect2 grow ( amount: float ) const¹

Returns a copy of this rectangle extended on all sides by the given amount. A negative amount shrinks the rectangle instead. See also grow_individual and grow_side.

    var a = Rect2(4, 4, 8, 8).grow(4) # a is Rect2(0, 0, 16, 16)
    var b = Rect2(0, 0, 8, 4).grow(2) # b is Rect2(-2, -2, 12, 8)

    var a = new Rect2(4, 4, 8, 8).Grow(4); // a is Rect2(0, 0, 16, 16)
    var b = new Rect2(0, 0, 8, 4).Grow(2); // b is Rect2(-2, -2, 12, 8)

Rect2 grow_individual ( left: float, top: float, right: float, bottom: float ) const¹

Returns a copy of this rectangle with its left, top, right, and bottom sides extended by the given amounts. Negative values shrink the sides, instead. See also grow and grow_side.

Rect2 grow_side ( side: int, amount: float ) const¹

Returns a copy of this rectangle with its side extended by the given amount (see Side constants). A negative amount shrinks the rectangle, instead. See also grow and grow_individual.

bool has_area ( ) const¹

Returns true if this rectangle has positive width and height. See also get_area.

bool has_point ( point: Vector2 ) const¹

Returns true if the rectangle contains the given point. By convention, points on the right and bottom edges are not included.

Note: This method is not reliable for Rect2 with a negative size. Use abs first to get a valid rectangle.

Rect2 intersection ( b: Rect2 ) const¹

Returns the intersection between this rectangle and b. If the rectangles do not intersect, returns an empty Rect2.

    var rect1 = Rect2(0, 0, 5, 10)
    var rect2 = Rect2(2, 0, 8, 4)
    
    var a = rect1.intersection(rect2) # a is Rect2(2, 0, 3, 4)

    var rect1 = new Rect2(0, 0, 5, 10);
    var rect2 = new Rect2(2, 0, 8, 4);
    
    var a = rect1.Intersection(rect2); // a is Rect2(2, 0, 3, 4)

Note: If you only need to know whether two rectangles are overlapping, use intersects, instead.

bool intersects ( b: Rect2, include_borders: bool = false ) const¹

Returns true if this rectangle overlaps with the b rectangle. The edges of both rectangles are excluded, unless include_borders is true.

bool is_equal_approx ( rect: Rect2 ) const¹

Returns true if this rectangle and rect are approximately equal, by calling Vector2.is_equal_approx on the position and the size.

bool is_finite ( ) const¹

Returns true if this rectangle's values are finite, by calling Vector2.is_finite on the position and the size.

Rect2 merge ( b: Rect2 ) const¹

Returns a Rect2 that encloses both this rectangle and b around the edges. See also encloses.

运算符说明

bool operator != ( right: Rect2 )

Returns true if the position or size of both rectangles are not equal.

Note: Due to floating-point precision errors, consider using is_equal_approx instead, which is more reliable.

Rect2 **operator *** ( right: Transform2D )

Inversely transforms (multiplies) the Rect2 by the given Transform2D transformation matrix, under the assumption that the transformation basis is orthonormal (i.e. rotation/reflection is fine, scaling/skew is not).

rect * transform is equivalent to transform.inverse() * rect. See Transform2D.inverse.

For transforming by inverse of an affine transformation (e.g. with scaling) transform.affine_inverse() * rect can be used instead. See Transform2D.affine_inverse.

bool operator == ( right: Rect2 )

Returns true if both position and size of the rectangles are exactly equal, respectively.

Note: Due to floating-point precision errors, consider using is_equal_approx instead, which is more reliable.