365ee2c70d
This makes it more efficient to plot piecewise functions by drawing each piece with one renderer, and possible to plot functions with discontinuities by using a renderer to draw each continuous piece.
58 lines
2.5 KiB
Racket
58 lines
2.5 KiB
Racket
#lang racket/base
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(require racket/class racket/match racket/list racket/flonum racket/contract
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unstable/latent-contract/defthing
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plot/utils)
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(provide (all-defined-out))
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;; ===================================================================================================
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;; Surface plots of R R -> R functions
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(define ((surface3d-render-proc f samples color style line-color line-width line-style alpha label)
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area)
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(match-define (vector x-ivl y-ivl z-ivl) (send area get-bounds-rect))
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(define num (animated-samples samples))
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(define sample (f (vector x-ivl y-ivl) (vector num num)))
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(match-define (ivl x-min x-max) x-ivl)
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(match-define (ivl y-min y-max) y-ivl)
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(match-define (ivl z-min z-max) z-ivl)
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(send area put-alpha alpha)
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(send area put-brush color style)
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(send area put-pen line-color line-width line-style)
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(let* ([flonum-ok? (flonum-ok-for-3d? x-min x-max y-min y-max z-min z-max)]
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[sample (if flonum-ok? (2d-sample-exact->inexact sample) sample)])
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(for-2d-sample
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(xa xb ya yb z1 z2 z3 z4) sample
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(send area put-polygon
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(list (vector xa ya z1) (vector xb ya z2) (vector xb yb z3) (vector xa yb z4)))))
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(cond [label (rectangle-legend-entry label color style line-color line-width line-style)]
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[else empty]))
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(defproc (surface3d
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[f (real? real? . -> . real?)]
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[x-min (or/c rational? #f) #f] [x-max (or/c rational? #f) #f]
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[y-min (or/c rational? #f) #f] [y-max (or/c rational? #f) #f]
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[#:z-min z-min (or/c rational? #f) #f] [#:z-max z-max (or/c rational? #f) #f]
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[#:samples samples (and/c exact-integer? (>=/c 2)) (plot3d-samples)]
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[#:color color plot-color/c (surface-color)]
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[#:style style plot-brush-style/c (surface-style)]
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[#:line-color line-color plot-color/c (surface-line-color)]
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[#:line-width line-width (>=/c 0) (surface-line-width)]
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[#:line-style line-style plot-pen-style/c (surface-line-style)]
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[#:alpha alpha (real-in 0 1) (surface-alpha)]
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[#:label label (or/c string? #f) #f]
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) renderer3d?
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(define x-ivl (ivl x-min x-max))
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(define y-ivl (ivl y-min y-max))
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(define z-ivl (ivl z-min z-max))
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(define g (2d-function->sampler f (vector x-ivl y-ivl)))
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(renderer3d (vector x-ivl y-ivl z-ivl)
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(surface3d-bounds-fun g samples)
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default-ticks-fun
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(surface3d-render-proc g samples color style
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line-color line-width line-style alpha label)))
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