Sly: Rectangles

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4.2.2 Rectangles

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(use-modules (sly math rect))
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Rects are 2D axis-aligned bounding boxes. They are useful for -defining rectangular regions, such as the hitbox of a game entity, or -the viewport of a camera. Because rects are axis-aligned, they -provide a cheap means to perform simple collision detection. -

The <rect> type descriptor has been exposed for use with -Guile’s (ice-9 match) pattern matching module. -

Scheme Variable: <rect>: Rectangle data type with fields x, y, width, -height, in that order. -

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Scheme Procedure: make-rect x y width height: Create a new rectangle with position (x, y), and -dimensions (width, height). -

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Scheme Variable: null-rect: Rectangle with x, y, width, and height of 0. -

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Scheme Syntax: rect? obj: Return #t if obj is a rectangle. -

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Scheme Syntax: rect-x rect: Return the x coordinate of rect. -

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Scheme Syntax: rect-y rect: Return the x coordinate of rect. -

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Scheme Syntax: rect-width rect: Return the width of rect. -

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Scheme Syntax: rect-height rect: Return the height of rect. -

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Scheme Procedure: rect-left rect: Return the left-hand x coordinate of rect. -

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Scheme Procedure: rect-right rect: Return the right-hand x coordinate of rect. -

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Scheme Procedure: rect-top rect: Return the top y coordinate of rect -

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Scheme Procedure: rect-bottom rect: Return the bottom y coordinate of rect. -

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Scheme Procedure: rect-top-left rect: Return the top-left corner of rect. -

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Scheme Procedure: rect-top-right rect: Return the top-right corner of rect. -

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Scheme Procedure: rect-bottom-left rect
Scheme Procedure: rect-position rect: Return the bottom-left corner of rect -

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Scheme Procedure: rect-bottom-right rect: Return the bottom-right corner of rect. -

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Scheme Procedure: rect-center-x rect: Return the center x coordinate of rect. -

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Scheme Procedure: rect-center-y rect: Return the center y coordinate of rect. -

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Scheme Procedure: rect-center rect: Return the center of rect. -

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Scheme Procedure: rect-half-width rect: Return the half width of rect. -

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Scheme Procedure: rect-half-height rect: Return the half height of rect. -

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Scheme Procedure: rect-size rect: Return the size of rect. -

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Scheme Procedure: rect-move rect v
Scheme Procedure: rect-move rect x y: Create a new rectangle by moving rect by the given 2D vector -offset v, or the coordinates x and y. -

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Scheme Procedure: rect-inflate rect size
Scheme Procedure: rect-inflate rect width height: Create a new rectangle by growing rect by the 2D vector -size (or width and height) without changing the -center point. -

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Scheme Procedure: rect-union rect1 rect2: Create a new rectangle that covers the area of both rect1 and -rect2. -

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Scheme Procedure: rect-clip rect1 rect2: Create a new rectangle that is the overlapping region of rect1 -and rect2. If the rects do not overlap, a rect of size 0 is -returned. -

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Scheme Procedure: rect-clamp rect v: Return a new 2D vector by constraining v to the bounds of -rect. -

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Scheme Procedure: rect-within? rect1 rect2: Return #t if rect2 is completely within rect1. -

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Scheme Procedure: rect-intersects? rect1 rect2: Return #t if rect2 overlaps rect1. -

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Scheme Procedure: rect-contains? rect v
Scheme Procedure: rect-contains? rect x y: Return #t if the 2D vector v (or the coordinates x -and y) is within rect. -

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