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;"tek41.scm", Tektronix 4100 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. Let me know if you test or fix it.
;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.
(define esc-string (string (integer->char #o33)))
(define tek41:init
(string-append
esc-string "%!0"
;;1. set tek mode
esc-string "MN0"
;;2. set character path to 0 (characters placed equal to rotation)
esc-string "MCB7C;"
;;3. set character size to 59 height
esc-string "MQ1"
;;4. set character precision to string
esc-string "MT1"
;;5. set character text index to 1
esc-string "MG1"
;;6. set character write mode to overstrike
esc-string "RK!"
;;7. clear the view
esc-string "SK!"
;;8. clear the segments
esc-string "LZ"
;;9. clear the dialog buffer
esc-string "%!1"
;;10. set ansi mode
))
(define (tek41:init) (display tek41:init-str) (force-output))
(define (tek41:reset)
(string-append
esc-string "%!0"
;;1. set tek mode
esc-string "LZ"
;;2. clear the dialog buffer
esc-string "%!1"
;;3. set ansi mode
))
(define (tek41:reset) (display tek41:reset-str) (force-output))
(define tek41:graphics-str
(string-append
esc-string "%!0"
;;1. set tek mode
esc-string (string (integer->char #o14))
;;2. clear the screen
esc-string "LV0"
;;3. set dialog area invisible
))
(define (tek41:graphics) (display tek41:graphics-str) (force-output))
(define tek41:text-str
(string-append
esc-string "LV1"
;;1. set dialog area visible
esc-string "%!1"
;;2. set ansi mode
))
(define (tek41:text) (display tek41:text-str) (force-output))
(define tek41:move-str
(string-append esc-string "LF"))
(define (tek41:move x y)
(display tek41:move-str)
(tek41:encode-x-y x y)
(force-output))
(define tek41:draw-str
(string-append esc-string "LG"))
(define (tek41:draw x y)
(display tek41:draw-str)
(tek41:encode-x-y x y)
(force-output))
(define tek41:set-marker-str (string-append esc-string "MM"))
(define tek41:draw-marker-str (string-append esc-string "LH"))
(define (tek41:point x y number)
(display tek41:set-marker-str)
(tek41:encode-int (remainder (max number 0) 11))
(display tek41:draw-marker-str)
(tek41:encode-x-y x y)
(force-output))
(define (tek41:encode-x-y x y)
(let ((hix (+ (quotient x 128) 32))
(lox (+ (modulo (quotient x 4) 32) 64))
(hiy (+ (quotient y 128) 32))
(loy (+ (modulo (quotient y 4) 32) 96))
(eb (+ (* (modulo y 4) 4) (modulo x 4) 96)))
(if (positive? hiy) (write-char (integer->char hiy)))
(if (positive? eb) (write-char (integer->char eb)))
(if (positive? (+ loy eb hix)) (write-char (integer->char loy)))
(if (positive? hix) (write-char (integer->char hix)))
(write-char (integer->char lox))))
(define (tek41:encode-int number)
(let* ((mag (abs number))
(hi1 (+ (quotient mag 1024) 64))
(hi2 (+ (modulo (quotient mag 16) 64) 64))
(lo (+ (modulo mag 16) 32)))
(if (>= number 0) (set! lo (+ lo 16)))
(if (not (= hi1 64)) (write-char (integer->char hi1)))
(if (or (not (= hi2 64))
(not (= hi1 64)))
(write-char (integer->char hi2)))
(write-char (integer->char lo))))
(define (test)
(tek41:init)
(tek41:reset)
(tek41:graphics)
(do ((i 0 (+ 1 i)))
((> i 15))
(tek41:linetype i)
(tek41:move (+ (* 200 i) 1000) 1000)
(tek41:draw (+ (* 200 i) 2000) 2000))
(tek41:text))
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