553c72ab28
Moved Racket-language, doc-generating "defthing" defines to unstable/latent-contract/defthing (will document in another commit)
64 lines
2.4 KiB
Racket
64 lines
2.4 KiB
Racket
#lang racket
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(require plot plot/utils unstable/flonum)
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(time
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(plot3d (isosurface3d (λ (x y z) (sqrt (+ (sqr x) (sqr y) (sqr z)))) 1
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#:color 2 #:line-style 'transparent
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#:label "Sphere")
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#:x-min -0.8 #:x-max 0.8
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#:y-min -0.8 #:y-max 0.8
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#:z-min -0.8 #:z-max 0.8
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#:altitude 30
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#:legend-anchor 'center))
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(time
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(define saddle (λ (x y z) (- (sqr x) (* 1/2 (+ (sqr y) (sqr z))))))
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(plot3d (isosurfaces3d saddle #:d-min -1 #:d-max 1 #:label "d")
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#:x-min -2 #:x-max 2
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#:y-min -2 #:y-max 2
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#:z-min -2 #:z-max 2
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#:legend-anchor 'top-left))
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(time
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(define saddle (λ (x y z) (- (sqr x) (* 1/2 (+ (sqr y) (sqr z))))))
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(plot3d (isosurfaces3d saddle #:d-min -1 #:d-max 1
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#:colors '(1 2 3)
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#:line-colors '(1 2 3)
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#:line-styles '(solid)
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#:alphas '(3/4)
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#:label "d")
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#:x-min -2 #:x-max 2
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#:y-min -2 #:y-max 2
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#:z-min -2 #:z-max 2
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#:legend-anchor 'top-left))
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(time
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(define saddle (λ (x y z) (- (sqr x) (* 1/2 (+ (sqr y) (sqr z))))))
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(plot3d (isosurface3d saddle -1/4 #:samples 21
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#:color "black" #:style 3
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#:alpha 1
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#:label "d = -1/4")
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#:x-min -2 #:x-max 2
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#:y-min -2 #:y-max 2
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#:z-min -2 #:z-max 2))
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(define 2pi (* 2 pi))
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(time
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(define (f1 θ ρ) (+ 1 (/ θ 2pi) (* 1/8 (sin (* 8 ρ)))))
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(define (f2 θ ρ) (+ (/ θ 2pi) (* 1/8 (sin (* 8 ρ)))))
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(plot3d (list (polar3d f1 #:samples 41 #:color "navajowhite" #:line-style 'transparent #:alpha 2/3)
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(polar3d f2 #:samples 41 #:color "navajowhite" #:line-style 'transparent #:alpha 2/3)
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(parametric3d (λ (ρ) (3d-polar->3d-cartesian 0 ρ (f1 2pi ρ)))
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(* -1/2 pi) (* 1/2 pi)
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#:color "navajowhite" #:width 2)
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(lines3d '(#(0 0 2) #(0 0 -2)) #:color "navajowhite" #:width 2))
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#:title "A Seashell" #:x-label #f #:y-label #f #:angle 210 #:altitude 30))
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(define flepsilon (flnext 0.0))
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(time
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(plot3d (isosurface3d (λ (x y z) (+ (sqr x) (sqr y) (sqr z))) (sqr (inexact->exact flepsilon))
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(- flepsilon) flepsilon (- flepsilon) flepsilon (- flepsilon) flepsilon)))
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