143 lines
4.9 KiB
Racket
143 lines
4.9 KiB
Racket
#lang racket/base
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(require racket/gui/base racket/class racket/match unstable/parameter-group
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"../common/snip.rkt"
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"../common/math.rkt"
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"../common/worker-thread.rkt"
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"../common/parameters.rkt")
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(provide 3d-plot-snip% make-3d-plot-snip)
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(define show-rotate-message? #t)
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(struct draw-command (animating? angle altitude width height) #:transparent)
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(define (clamp x mn mx) (min* (max* x mn) mx))
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(define 3d-plot-snip%
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(class plot-snip%
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(init init-bm saved-plot-parameters)
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(init-field make-bm angle altitude width height)
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(inherit set-bitmap get-bitmap
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get-saved-plot-parameters
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set-message stop-message set-message-center reset-message-timeout
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update-thread-running? set-update
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get-left-down-here?)
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(super-make-object init-bm saved-plot-parameters)
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(define/override (copy)
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(make-object this%
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(get-bitmap) (get-saved-plot-parameters)
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make-bm angle altitude width height))
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(define mouse-x 0)
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(define mouse-y 0)
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(define left-click-x 0)
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(define left-click-y 0)
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(define last-angle angle)
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(define last-altitude altitude)
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(define (set-angle!)
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(define degrees-per-pixel (/ 180 (send (get-bitmap) get-width)))
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(define dx (- mouse-x left-click-x))
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(set! angle (real-modulo (+ last-angle (* dx degrees-per-pixel)) 360)))
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(define (set-altitude!)
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(define degrees-per-pixel (/ 180 (send (get-bitmap) get-height)))
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(define dy (- mouse-y left-click-y))
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(set! altitude (clamp (+ last-altitude (* dy degrees-per-pixel)) 0 90)))
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(define (start-update-thread animating?)
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(send this start-update-thread
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(λ () (make-worker-thread
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(match-lambda
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[(draw-command animating? angle altitude width height)
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(make-bm animating? angle altitude width height)])))
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(λ (animating?) (draw-command animating? angle altitude width height))
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(λ (rth)
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(define new-bm (worker-thread-try-get rth))
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(cond [(is-a? new-bm bitmap%)
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(set-bitmap new-bm)
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(when (not (and (= last-angle angle)
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(= last-altitude altitude)))
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(set-angles-message))
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#t]
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[else #f]))
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animating?))
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(define (set-angles-message)
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(set-message (format "angle = ~a\naltitude = ~a"
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(number->string (inexact->exact (round angle)))
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(number->string (inexact->exact (round altitude))))
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#:refresh? #f))
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(define (set-click-message)
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(when show-rotate-message?
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(set-message "Click and drag to rotate")))
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(define (on-left-down)
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(set! left-click-x mouse-x)
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(set! left-click-y mouse-y)
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(set! last-angle angle)
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(set! last-altitude altitude)
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(set-angles-message)
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(start-update-thread #t)
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(set-update #t))
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(define (on-left-up)
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(when (get-left-down-here?)
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(set! last-angle angle)
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(set! last-altitude altitude)
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(when (update-thread-running?)
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(start-update-thread #f)
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(set-update #t))))
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(define (on-motion evt last-mouse-x last-mouse-y)
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(cond [(get-left-down-here?)
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(when (not (and (= last-mouse-x mouse-x)
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(= last-mouse-y mouse-y)))
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(set! show-rotate-message? #f)
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(set-angle!)
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(set-altitude!)
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(unless (update-thread-running?)
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(start-update-thread #t))
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(set-update #t))]
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[(and (not (send evt get-left-down))
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(<= 0 mouse-x (send (get-bitmap) get-width))
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(<= 0 mouse-y (send (get-bitmap) get-height)))
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(set-click-message)]))
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(define/override (on-event dc x y editorx editory evt)
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(define evt-type (send evt get-event-type))
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(define last-mouse-x mouse-x)
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(define last-mouse-y mouse-y)
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(set! mouse-x (- (send evt get-x) x))
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(set! mouse-y (- (send evt get-y) y))
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(case evt-type
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[(left-down) (on-left-down)]
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[(left-up) (on-left-up)]
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[(motion) (on-motion evt last-mouse-x last-mouse-y)])
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(super on-event dc x y editorx editory evt))
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(define/override (resize w h)
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(when (not (and (= w width) (= h height)))
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(set! width w)
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(set! height h)
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(set-message-center (* 1/2 w) (* 1/2 h))
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(stop-message)
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(when (not (update-thread-running?))
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(start-update-thread #t))
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(set-update #t))
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#f)
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))
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(define (make-3d-plot-snip
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init-bm saved-plot-parameters
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make-bm angle altitude width height)
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(make-object 3d-plot-snip%
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init-bm saved-plot-parameters
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make-bm angle altitude width height))
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