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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))