+++ /dev/null
-#lang racket
-;; Atreus 2 case design
-;; Copyright © 2019-2020 Phil Hagelberg and contributors
-;; released under the GPLv3 or later
-
-(require xml)
-
-;; glowforge uses 96 dpi, 25.4 mm in an inch
-(define scale (/ 96 25.4))
-(define width 260)
-(define height 132)
-
-
-(define cols 6) ; per hand
-(define rows 4)
-(define angle (degrees->radians 10))
-(define corner-radius 6.0)
-
-(define alps-switch-width 15.34)
-(define alps-switch-height 12.49)
-(define cherry-switch-width 13.62)
-(define cherry-switch-height 13.72)
-(define cherry? false)
-(define switch-height (if cherry? cherry-switch-height alps-switch-height))
-(define switch-width (if cherry? cherry-switch-width alps-switch-width))
-
-(define switch-spacing 19.0)
-
-(define screw-radius 1.4) ; for M3 screws + kerf
-
-(define side-screw-distance (* switch-spacing rows))
-(define bottom-screw-distance (* switch-spacing cols))
-(define left corner-radius)
-(define bottom 95) ; outer bottom
-(define left-top (+ left (* side-screw-distance (sin angle))))
-(define top (- bottom (* side-screw-distance (cos angle))))
-(define right (- width corner-radius))
-(define right-top (- right (* side-screw-distance (sin angle))))
-(define mid-bottom (+ bottom (* bottom-screw-distance (sin angle)) -3))
-(define mid-offset 25)
-(define mid-x (/ width 2))
-(define mid-left (- mid-x mid-offset))
-(define mid-right (+ mid-x mid-offset))
-
-(define hull-coords (list (list right-top top)
- (list right bottom)
- (list mid-right mid-bottom)
- (list mid-left mid-bottom)
- (list left bottom)
- (list left-top top)))
-
-;;; screws
-(define screws
- `(g () ,@(for/list ([s (append (take hull-coords 2)
- ;; the bottom middle has only one screw but
- ;; two hull positions
- (list (list (/ width 2) mid-bottom))
- (drop hull-coords 4))])
- `(circle ((r ,(number->string screw-radius))
- (cx ,(number->string (first s)))
- (cy ,(number->string (second s))))))))
-
-;;; outline
-(define outline-coords (append hull-coords (take hull-coords 2)))
-
-(define (to-next-screw? theta current-screw)
- (let* ([current (list-ref outline-coords current-screw)]
- [cx (first current)] [cy (second current)]
- [next (list-ref outline-coords (add1 current-screw))]
- [nx (first next)] [ny (second next)]
- [dx (- nx cx)] [dy (- ny cy)]
- [next-theta (- (radians->degrees (atan dy dx)))])
- (= (floor (modulo (floor next-theta) 180))
- (floor (modulo (- theta 90) 180)))))
-
-;; trace the outline by going from screw to screw until you've gone full-circle
-(define (outline-points coords theta current-screw)
- (if (< -360 (- theta 90) 360)
- (let* ([current (list-ref outline-coords current-screw)]
- [sx (first current)] [sy (second current)]
- [x (+ sx (* (cos (degrees->radians theta)) corner-radius))]
- [y (- sy (* (sin (degrees->radians theta)) corner-radius))]
- [coords (cons (format "~s,~s" x y) coords)])
- (if (to-next-screw? theta current-screw)
- (outline-points coords theta (add1 current-screw))
- (outline-points coords (sub1 theta) current-screw)))
- coords))
-
-(define port-depth 8)
-
-(define port-curve (list (format "~s,~s" mid-right (- top corner-radius))
- (format "~s,~s" (+ mid-x corner-radius)
- (+ top port-depth
- (- corner-radius)))
- (format "~s,~s" (- mid-x corner-radius)
- (+ top port-depth
- (- corner-radius)))
- (format "~s,~s" mid-left (- top corner-radius))))
-
-(define (outline with-port?)
- `(polygon ((points ,(string-join (let ((noport (outline-points '() 90 0)))
- (if with-port?
- (append noport port-curve)
- noport)))))))
-
-;;; switches
-
-(define column-offsets `(8 5 0 6 11 ,(+ 8 switch-spacing switch-spacing)))
-
-(define (switch row col)
- (let* ([x (* (+ 1 col) switch-spacing)]
- [y (+ (list-ref column-offsets col) (* switch-spacing row))])
- `(rect ((height ,(number->string switch-height))
- (width ,(number->string switch-width))
- (x ,(number->string x))
- (y ,(number->string y))))))
-
-(define hand-height (+ (* switch-spacing rows) (- switch-spacing switch-height)
- (list-ref column-offsets 0)))
-(define switch-x-offset -6.5)
-(define switch-y-offset (- bottom hand-height -3.5))
-
-(define switches
- `(g ((transform ,(format "translate(~s, ~s) rotate(~s, ~s, ~s)"
- switch-x-offset switch-y-offset
- (radians->degrees angle)
- 0 hand-height)))
- ,@(for/list ([col (in-range cols)]
- #:when true
- [row (if (= 5 col) '(0 1) (in-range rows))])
- (switch row col))))
-
-(define switches-right
- `(g ((transform ,(format "translate(~s,~s) scale(-1, 1)" width 0)))
- ,switches))
-
-(define logo-doc (call-with-input-file "logo-fragment.svg" read-xml))
-
-(define pcb-doc (call-with-input-file "pcb-fragment.svg" read-xml))
-
-(define (layer plate)
- (document (prolog '() false '())
- (xexpr->xml
- `(svg ((xmlns:svg "http://www.w3.org/2000/svg")
- (height ,(number->string (* height scale)))
- (width ,(number->string (* width scale))))
- ,@(if (eq? plate 'switch)
- `((g ((transform "translate(436, 115)")
- (stroke "red"))
- ,(xml->xexpr (document-element logo-doc))))
- '())
- ,@(if (eq? plate 'spacer)
- (list (xml->xexpr (document-element pcb-doc)))
- (list))
- (g ((transform ,(format "scale(~s, ~s)" scale scale))
- (stroke-width "1")
- (stroke "black")
- (fill-opacity "0"))
- ,screws
- ,(outline (not (eq? plate 'switch)))
- ,@(if (eq? plate 'switch)
- (list switches switches-right)
- (list)))))
- '()))
-
-;; to laser cut these, you have to open them in inkscape, then save,
-;; and then upload; for some reason the glowforge crashes if you try to cut
-;; them directly.
-
-(define (write-out-layer layer-name)
- (call-with-output-file (format "case2-~a.svg" (symbol->string layer-name))
- (lambda (out)
- (display "<?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"no\"?>" out)
- (display-xml (layer layer-name) out))
- #:exists 'replace))
-
-;; live-reload with:
-;; qiv --watch case2-switch.svg
-
-(write-out-layer 'switch)
-(write-out-layer 'bottom)
-(write-out-layer 'spacer)
projects / atreides.git / blobdiff