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;"tek40.scm", Tektronix 4000 series graphics support in Scheme.
;Copyright (C) 1992, 1994 Aubrey Jaffer
;
;Permission to copy this software, to redistribute it, and to use it
;for any purpose is granted, subject to the following restrictions and
;understandings.
;
;1. Any copy made of this software must include this copyright notice
;in full.
;
;2. I have made no warrantee or representation that the operation of
;this software will be error-free, and I am under no obligation to
;provide any services, by way of maintenance, update, or otherwise.
;
;3. In conjunction with products arising from the use of this
;material, there shall be no use of my name in any advertising,
;promotional, or sales literature without prior written consent in
;each case.
;THIS FILE NEEDS MORE WORK.
;The Tektronix 4000 series graphics protocol gives the user a 1024 by
;1024 square drawing area. The origin is in the lower left corner of
;the screen. Increasing y is up and increasing x is to the right.
;The graphics control codes are sent over the current-output-port and
;can be mixed with regular text and ANSI or other terminal control
;sequences.
; (tek40:init) procedure
(define (tek40:init) 'noop)
(define esc-string (string (integer->char #o33)))
(define tek40:graphics-str
(string-append
(string slib:form-feed)
esc-string (string (integer->char #o14))
;; clear the screen
))
(define (tek40:graphics) (display tek40:graphics-str) (force-output))
(define (tek40:text)
(tek40:move 0 12)
(write-char (integer->char #o37)))
(define (tek40:linetype linetype)
(cond ((or (negative? linetype) (> linetype 15))
(slib:error "bad linetype" linetype))
(else
(display esc-string)
(write-char (integer->char (+ (char->integer #\`) linetype))))))
(define (tek40:move x y)
(write-char (integer->char #o35))
(tek40:draw x y))
(define (tek40:draw x y)
(display (string
(integer->char (+ #x20 (quotient y 32)))
(integer->char (+ #x60 (remainder y 32)))
(integer->char (+ #x20 (quotient x 32)))
(integer->char (+ #x40 (remainder x 32))))))
(define (tek40:put-text x y str)
(tek40:move x (+ y -11))
(write-char (integer->char #o37))
(display str))
(define (tek40:reset) (display tek40:graphics-str) (force-output))
(define (tek40:test)
(tek40:init)
; (tek40:reset)
(tek40:graphics)
(tek40:linetype 0)
(tek40:move 100 100)
(tek40:draw 200 100)
(tek40:draw 200 200)
(tek40:draw 100 200)
(tek40:draw 100 100)
(do ((i 0 (+ 1 i)))
((> i 15))
(tek40:linetype i)
(tek40:move (+ (* 50 i) 100) 100)
(tek40:put-text (+ (* 50 i) 100) 100 (number->string i))
(tek40:move (+ (* 50 i) 100) 100)
(tek40:draw (+ (* 50 i) 200) 200))
(tek40:linetype 0)
(tek40:text))
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