449 lines
15 KiB
Scheme
449 lines
15 KiB
Scheme
(module (engine components core) ()
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(import scheme
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(chicken base)
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(chicken module)
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(srfi 1)
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(srfi 99))
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;; Vector exports
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(export make-vector2 vector2? vector2-x
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set-vector2-x! vector2-y set-vector2-y!)
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;; 2D Vector type
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;; TODO: this could be done with a macro to save some definitions
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(define-record-type <vector2>
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(int:make-vector2 x y)
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vector2?
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(x vector2-x int:set-vector2-x!)
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(y vector2-y int:set-vector2-y!))
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;; Type safe 2D vector constructor
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(define (make-vector2 x y)
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(assert (number? x))
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(assert (number? y))
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(int:make-vector2 x y))
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;; Type safe 2D vector setter
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(define (set-vector2-x! vector2 x)
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(assert (vector2? vector2))
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(assert (number? x))
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(int:set-vector2-x! vector2 x))
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;; Type safe 2D vector setter
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(define (set-vector2-y! vector2 y)
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(assert (vector2? vector2))
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(assert (number? y))
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(int:set-vector2-y! vector2 y))
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;; Vector utility functions
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(define (vector-x component)
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(assert (record? component))
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((rtd-accessor (record-rtd component) 'x) component))
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(define (set-vector-x! component x)
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(assert (record? component))
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(assert (number? x))
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((rtd-mutator (record-rtd component) 'x) component x))
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(define (vector-y component)
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(assert (record? component))
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((rtd-accessor (record-rtd component) 'y) component))
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(define (set-vector-y! component y)
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(assert (record? component))
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(assert (number? y))
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((rtd-mutator (record-rtd component) 'y) component y))
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;; Export vector functions
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(export vector-= vector-+ vector-- vector-* vector-/
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vector-magnitude vector-normalize vector-dot
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vector-angle-between)
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;; TODO: make this function accept any number of vectors
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(define (vector-= vec1 vec2)
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(assert (and (record? vec1)
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(record? vec2)))
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(assert (eq? (rtd-name (record-rtd vec1))
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(rtd-name (record-rtd vec2))))
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(assert ((disjoin vector2?) vec1))
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(cond
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((vector2? vec1)
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(and (= (vector-x vec1) (vector-x vec2))
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(= (vector-y vec1) (vector-y vec2))))))
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;; TODO: make this function accept any number of vectors
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(define (vector-+ vec1 vec2)
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(assert (and (record? vec1)
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(record? vec2)))
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(assert (eq? (rtd-name (record-rtd vec1))
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(rtd-name (record-rtd vec2))))
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(assert ((disjoin vector2?) vec1))
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(cond
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((vector2? vec1)
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(make-vector2 (+ (vector-x vec1) (vector-x vec2))
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(+ (vector-y vec1) (vector-y vec2))))))
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;; TODO: make this function accept any number of vectors
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(define (vector-- vec1 vec2)
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(assert (and (record? vec1)
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(record? vec2)))
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(assert (eq? (rtd-name (record-rtd vec1))
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(rtd-name (record-rtd vec2))))
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(assert ((disjoin vector2?) vec1))
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(cond
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((vector2? vec1)
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(make-vector2 (- (vector-x vec1) (vector-x vec2))
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(- (vector-y vec1) (vector-y vec2))))))
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;; TODO: make this function accept any number of vectors
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(define (vector-* vec1 vec2)
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(assert (and (record? vec1)
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(record? vec2)))
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(assert (eq? (rtd-name (record-rtd vec1))
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(rtd-name (record-rtd vec2))))
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(assert ((disjoin vector2?) vec1))
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(cond
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((vector2? vec1)
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(make-vector2 (* (vector-x vec1) (vector-x vec2))
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(* (vector-y vec1) (vector-y vec2))))))
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;; TODO: make this function accept any number of vectors
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(define (vector-/ vec1 vec2)
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(assert (and (record? vec1)
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(record? vec2)))
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(assert (eq? (rtd-name (record-rtd vec1))
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(rtd-name (record-rtd vec2))))
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(assert ((disjoin vector2?) vec1))
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(cond
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((vector2? vec1)
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(make-vector2 (/ (vector-x vec1) (vector-x vec2))
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(/ (vector-y vec1) (vector-y vec2))))))
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;; Magnitude
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(define (vector-magnitude vec)
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(assert ((disjoin vector2?) vec))
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(cond
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((vector2? vec)
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(sqrt (+ (expt (vector-x vec) 2)
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(expt (vector-y vec) 2))))))
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(define (vector-dot vec1 vec2)
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(assert (and (record? vec1)
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(record? vec2)))
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(assert (eq? (rtd-name (record-rtd vec1))
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(rtd-name (record-rtd vec2))))
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(assert ((disjoin vector2?) vec1))
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(cond
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((vector2? vec1)
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(+ (* (vector-x vec1) (vector-x vec2))
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(* (vector-y vec1) (vector-y vec2))))))
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(define (vector-angle-between vec1 vec2)
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(assert (and (record? vec1)
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(record? vec2)))
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(assert (eq? (rtd-name (record-rtd vec1))
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(rtd-name (record-rtd vec2))))
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(assert ((disjoin vector2?) vec1))
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(cond
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((vector2? vec1)
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(acos (/ (vector-dot vec1 vec2)
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(* (vector-magnitude vec1)
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(vector-magnitude vec2)))))))
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;; Normalization
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(define (vector-normalize vec)
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(assert ((disjoin vector2?) vec)) ;; TODO: This assertion should be moved out of here
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(let ((magnitude (vector-magnitude vec)))
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(cond
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((vector2? vec)
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(make-vector2 (/ (vector-x vec)
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magnitude)
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(/ (vector-y vec)
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magnitude))))))
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;; Color exports
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(export make-color color-r color-g color-b color-a
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set-color-r! set-color-g! set-color-b! set-color-a!)
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;; Color type
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(define-record-type <color>
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(int:make-color r g b a)
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color?
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(r color-r int:set-color-r!)
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(g color-g int:set-color-g!)
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(b color-b int:set-color-b!)
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(a color-a int:set-color-a!))
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;; Type safe color constructor
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(define (make-color r g b a)
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(assert (and (number? r) (<= 0 r 1)))
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(assert (and (number? g) (<= 0 g 1)))
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(assert (and (number? b) (<= 0 b 1)))
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(assert (and (number? a) (<= 0 a 1)))
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(int:make-color r g b a))
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;; Type safe color setter
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(define (set-color-r! color r)
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(assert (color? color))
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(assert (and (number? r) (<= 0 r 1)))
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(int:set-color-r! color r))
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;; Type safe color setter
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(define (set-color-g! color g)
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(assert (color? color))
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(assert (and (number? g) (<= 0 g 1)))
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(int:set-color-g! color g))
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;; Type safe color setter
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(define (set-color-b! color b)
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(assert (color? color))
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(assert (and (number? b) (<= 0 b 1)))
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(int:set-color-b! color b))
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;; Type safe color setter
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(define (set-color-a! color a)
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(assert (color? color))
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(assert (and (number? a) (<= 0 a 1)))
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(int:set-color-a! color a))
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;; Screen transform record and exports
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(export make-screen-transform screen-transform?)
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;; The screen transform is for representing transformations in screen-space, that is
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;; in UI and not in 2D/3D
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(define-record-type <screen-transform>
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(int:make-screen-transform position pivot rotation scale anchor parent)
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screen-transform?
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(position screen-transform-position int:set-screen-transform-position!)
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(pivot screen-transform-pivot int:set-screen-transform-pivot!)
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(rotation screen-transform-rotation int:set-screen-transform-rotation!)
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(scale screen-transform-scale int:set-screen-transform-scale!)
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(anchor screen-transform-anchor int:set-screen-transform-anchor!)
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(parent screen-transform-parent int:set-screen-transform-parent!))
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;; Type safe constructor
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(define (make-screen-transform position rotation scale anchor parent)
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(assert (vector2? position))
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(assert (real? rotation))
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(assert (vector2? scale))
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(assert (and (symbol? anchor) (member anchor '(top-left top-middle top-right
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center-left center center-right
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bottom-left bottom-middle bottom-right))))
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(assert (and (symbol? parent)))
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(int:make-screen-transform position rotation scale anchor parent))
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;; Generic accessors and mutators for position, rotation, scale, anchor, and parent
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;; This allows us to abstract across different transform types - (position) will work for
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;; screen-transform and 2D-transform, with type checking
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(export position set-position! rotation set-rotation! scale set-scale!
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anchor set-anchor! parent set-parent!)
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(define (position component)
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(assert (record? component))
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((rtd-accessor (record-rtd component) 'position) component))
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(define (set-position! component position)
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(assert (record? component))
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(cond
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((screen-transform? component) (assert (vector2? position))))
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((rtd-mutator (record-rtd component) 'position) component position))
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(define (pivot component)
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(assert (record? component))
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((rtd-accessor (record-rtd component) 'pivot) component))
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(define (set-pivot! component pivot)
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(assert (record? component))
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(cond
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((screen-transform? component) (assert (vector2? pivot))))
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((rtd-mutator (record-rtd component) 'pivot) component pivot))
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(define (rotation component)
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(assert (record? component))
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((rtd-accessor (record-rtd component) 'rotation) component))
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(define (set-rotation! component rotation)
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(assert (record? component))
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(cond
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((screen-transform? component) (assert (real? rotation))))
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((rtd-mutator (record-rtd component) 'rotation) component rotation))
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(define (scale component)
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(assert (record? component))
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((rtd-accessor (record-rtd component) 'scale) component))
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(define (set-scale! component scale)
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(assert (record? component))
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(cond
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((screen-transform? component) (assert (vector2? scale))))
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((rtd-mutator (record-rtd component) 'scale) component scale))
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(define (anchor component)
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(assert (record? component))
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((rtd-accessor (record-rtd component) 'anchor) component))
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(define (set-anchor! component anchor)
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(assert (record? component))
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(cond
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((screen-transform? component)
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(assert (and (symbol? anchor)
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(member anchor '(top-left top-middle top-right
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center-left center center-right
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bottom-left bottom-middle bottom-right))))))
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((rtd-mutator (record-rtd component) 'anchor) component anchor))
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(define (parent component)
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(assert (record? component))
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((rtd-accessor (record-rtd component) 'parent) component))
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(define (set-parent! component parent)
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(assert (record? component))
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(cond
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((screen-transform? component)
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(assert (symbol? anchor))))
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((rtd-mutator (record-rtd component) 'parent) component parent))
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;; Visuals
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;; Primitive shape visual types
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(export pixel-2d? make-pixel-2d
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pixel-2d-position set-pixel-2d-position!)
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(define-record-type <pixel-2d>
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(int:make-pixel-2d position)
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pixel-2d?
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(position pixel-2d-position int:set-pixel-2d-position!))
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(define (make-pixel-2d position)
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(assert (vector2? position))
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(int:make-pixel-2d position))
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(define set-pixel-2d-position!
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(guarded-mutator pixel-2d? 'position vector2?))
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(export line-2d? make-line-2d line-2d-start-pos
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set-line-2d-start-pos! line-2d-end-pos set-line-2d-end-pos!
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line-2d-thickness set-line-2d-thickness!)
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(define-record-type <line-2d>
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(int:make-line-2d start-pos end-pos thickness)
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line-2d?
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(start-pos line-2d-start-pos int:set-line-2d-start-pos!)
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(end-pos line-2d-end-pos int:set-line-2d-end-pos!)
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(thickness line-2d-thickness int:set-line-2d-thickness!))
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(define (make-line-2d start-pos end-pos thickness)
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(assert (vector2? start-pos))
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(assert (vector2? end-pos))
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(assert ((conjoin integer? positive?) thickness))
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(int:make-line-2d start-pos end-pos thickness))
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(define set-line-2d-start-pos!
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(guarded-mutator line-2d? 'start-pos vector2?))
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(define set-line-2d-end-pos!
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(guarded-mutator line-2d? 'end-pos vector2?))
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(define set-line-2d-thickness!
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(guarded-mutator line-2d? 'start-pos (conjoin integer? positive?)))
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(export circle-2d? make-circle-2d circle-2d-center
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set-circle-2d-center! circle-2d-radius set-circle-2d-radius!
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circle-2d-filled set-circle-2d-filled!)
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(define-record-type <circle-2d>
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(int:make-circle-2d center radius filled)
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circle-2d?
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(center circle-2d-center int:set-circle-2d-center!)
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(radius circle-2d-radius int:set-circle-2d-radius!)
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(filled circle-2d-filled? int:set-circle-2d-filled!))
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(define (make-circle-2d center radius filled)
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(assert (vector2? center))
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(assert ((conjoin integer? positive?) radius))
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(assert (boolean? filled))
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(int:make-circle-2d center radius filled))
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(define set-circle-2d-center!
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(guarded-mutator circle-2d? 'center vector2?))
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(define set-circle-2d-radius!
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(guarded-mutator circle-2d? 'radius (conjoin integer? positive?)))
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(define set-circle-2d-filled!
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(guarded-mutator circle-2d? 'filled boolean?))
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;; TODO: might be nicer to have the origin and width/height inside a rect-2d type or similar
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(export rectangle-2d? make-rectangle-2d rectangle-2d-origin
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set-rectangle-2d-origin! rectangle-2d-width set-rectangle-2d-width!
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rectangle-2d-height set-rectangle-2d-height! rectangle-2d-filled
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set-rectangle-2d-filled! rectangle-2d-thickness set-rectangle-2d-thickness!)
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(define-record-type <rectangle-2d>
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(int:make-rectangle-2d origin width height filled thickness)
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rectangle-2d?
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(origin rectangle-2d-origin int:set-rectangle-2d-origin!)
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(width rectangle-2d-width int:set-rectangle-2d-width!)
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(height rectangle-2d-height int:set-rectangle-2d-height!)
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(filled rectangle-2d-filled? int:set-rectangle-2d-filled!)
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(thickness rectangle-2d-thickness int:set-rectangle-2d-thickness))
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(define (make-rectangle-2d origin width height filled thickness)
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(assert (vector2? origin))
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(assert ((conjoin integer? positive?) width))
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(assert ((conjoin integer? positive?) height))
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(assert (boolean? filled))
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(assert ((conjoin integer? positive?) thickness))
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(int:make-rectangle-2d origin width height filled thickness))
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(define set-rectangle-2d-origin!
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(guarded-mutator rectangle-2d? 'origin vector2?))
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(define set-rectangle-2d-width!
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(guarded-mutator rectangle-2d? 'width (conjoin integer? positive?)))
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(define set-rectangle-2d-height!
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(guarded-mutator rectangle-2d? 'height (conjoin integer? positive?)))
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(define set-rectangle-2d-filled!
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(guarded-mutator rectangle-2d? 'filled boolean?))
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(define set-rectangle-2d-thickness!
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(guarded-mutator rectangle-2d? 'thickness (conjoin integer? positive?)))
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(export triangle-2d? make-triangle-2d triangle-2d-vertex-1
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triangle-2d-set-vertex-1! triangle-2d-vertex-2 triangle-2d-set-vertex-2!
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triangle-2d-vertex-3 triangle-2d-set-vertex-3! triangle-2d-filled set-triangle-2d-filled!)
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(define-record-type <triangle-2d>
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(int:make-triangle-2d vertex-1 vertex-2 vertex-3 filled)
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triangle-2d?
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(vertex-1 triangle-2d-vertex-1 int:set-triangle-2d-vertex-1!)
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(vertex-2 triangle-2d-vertex-2 int:set-triangle-2d-vertex-2!)
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(vertex-3 triangle-2d-vertex-3 int:set-triangle-2d-vertex-3!)
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(filled triangle-2d-filled int:set-triangle-2d-filled!))
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(define (make-triangle-2d vertex-1 vertex-2 vertex-3 filled)
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(assert (vector2? vertex-1))
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(assert (vector2? vertex-2))
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(assert (vector2? vertex-3))
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(assert (boolean? filled))
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(int:make-triangle-2d vertex-1 vertex-2 vertex-3 filled))
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(define set-triangle-2d-vertex-1!
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(guarded-mutator triangle-2d? 'vertex-1 vector2?))
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(define set-triangle-2d-vertex-2!
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(guarded-mutator triangle-2d? 'vertex-2 vector2?))
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(define set-triangle-2d-vertex-3!
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(guarded-mutator triangle-2d? 'vertex-3 vector2?))
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(define set-triangle-2d-vertex-filled!
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(guarded-mutator triangle-2d? 'filled boolean?))
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;; Visual component
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(export visual-2d? make-visual-2d visual-2d-draw set-visual-2d-draw!
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visual-2d-color set-visual-2d-color! visual-2d-layer set-visual-2d-layer!)
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(define-record-type <visual-2d>
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(int:make-visual-2d draw color layer)
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visual-2d?
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(draw visual-2d-draw int:set-visual-2d-draw!) ;; NOTE: Typing here: pixel-2d, line-2d, circle-2d, rectangle-2d, triangle-2d etc
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(color visual-2d-color int:set-visual-2d-color!)
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(layer visual-2d-layer int:set-visual-2d-layer!))
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(define (make-visual-2d draw color layer)
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(assert ((conjoin triangle-2d? rectangle-2d? circle-2d? line-2d? pixel-2d?) draw))
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(assert (color? color))
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(assert (integer? layer)))
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(define set-visual-2d-draw!
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(guarded-mutator visual-2d? 'draw (conjoin triangle-2d? rectangle-2d? circle-2d? line-2d? pixel-2d?)))
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(define set-visual-2d-color!
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(guarded-mutator visual-2d? 'color color?))
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(define set-visual-2d-layer!
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(guarded-mutator visual-2d? 'layer integer?))
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)
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