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152 | ;;; ezd - easy drawing for X11 displays.
;;;
;;; The procedures in this module generate the GRAPHIC objects representing
;;; lines and points.
;* Copyright 1990-1993 Digital Equipment Corporation
;* All Rights Reserved
;*
;* Permission to use, copy, and modify this software and its documentation is
;* hereby granted only under the following terms and conditions. Both the
;* above copyright notice and this permission notice must appear in all copies
;* of the software, derivative works or modified versions, and any portions
;* thereof, and both notices must appear in supporting documentation.
;*
;* Users of this software agree to the terms and conditions set forth herein,
;* and hereby grant back to Digital a non-exclusive, unrestricted, royalty-free
;* right and license under any changes, enhancements or extensions made to the
;* core functions of the software, including but not limited to those affording
;* compatibility with other hardware or software environments, but excluding
;* applications which incorporate this software. Users further agree to use
;* their best efforts to return to Digital any such changes, enhancements or
;* extensions that they make and inform Digital of noteworthy uses of this
;* software. Correspondence should be provided to Digital at:
;*
;* Director of Licensing
;* Western Research Laboratory
;* Digital Equipment Corporation
;* 250 University Avenue
;* Palo Alto, California 94301
;*
;* This software may be distributed (but not offered for sale or transferred
;* for compensation) to third parties, provided such third parties agree to
;* abide by the terms and conditions of this notice.
;*
;* THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
;* WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF
;* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT
;* CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
;* DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
;* PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
;* ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
;* SOFTWARE.
(module line)
(include "struct.sch")
(include "commands.sch")
(include "ginfo.sch")
(include "display.sch")
(include "view.sch")
(include "psdraw.sch")
(include "graphic.sch")
(include "xternal.sch")
;;; A line is generated by the following procedure.
(define (LINE x1 y1 x2 y2 line-width color dash)
(make-graphic
#f
(lambda ()
(let ((ux1 (user->x x1))
(ux2 (user->x x2))
(uy1 (user->y y1))
(uy2 (user->y y2))
(lw (max 1 (user->lw line-width))))
(list (- (min ux1 ux2) lw)
(- (min uy1 uy2) lw)
(+ (max ux1 ux2) lw)
(+ (max uy1 uy2) lw))))
(if (eq? color 'clear)
draw-clear
(lambda ()
(xdrawline *dpy* *xwindow*
(cv-gc (user->lw line-width) color #f dash #f #f)
(user->x x1) (user->y y1)
(user->x x2) (user->y y2))))
(if (eq? color 'clear)
draw-clear
(lambda ()
(pscolor color)
(pscommand "newpath" x1 y1 "moveto" x2 y2 "lineto")
(psstroke (user->lw line-width) dash)))
(lambda (minx miny maxx maxy)
(let* ((ux1 (user->x x1))
(ux2 (user->x x2))
(uy1 (user->y y1))
(uy2 (user->y y2))
(vertical (zero? (- ux2 ux1)))
(bbx1 (user->x minx))
(bbx2 (user->x maxx))
(bby1 (user->y miny))
(bby2 (user->y maxy))
(dx/2 (abs (/ (- bbx1 bbx2) 2)))
(dy/2 (abs (/ (- bby1 bby2) 2)))
(mouse-x (/ (+ bbx1 bbx2) 2))
(mouse-y (/ (+ bby1 bby2) 2))
(lw/2 (/ (user->lw line-width) 2))
(theta (if vertical (acos 0) (atan (/ (- uy2 uy1)
(- ux2 ux1)))))
(cos-theta (cos (- theta)))
(sin-theta (sin (- theta))))
(define (ROTATE-X x y)
(- (* x cos-theta) (* y sin-theta)))
(define (ROTATE-Y x y)
(+ (* x sin-theta) (* y cos-theta)))
(and (<= (- (min (rotate-x ux1 uy1) (rotate-x ux2 uy2))
dx/2)
(rotate-x mouse-x mouse-y)
(+ (max (rotate-x ux1 uy1) (rotate-x ux2 uy2))
dx/2))
(<= (- (min (rotate-y ux1 uy1) (rotate-y ux2 uy2))
dy/2 lw/2)
(rotate-y mouse-x mouse-y)
(+ (max (rotate-y ux1 uy1) (rotate-y ux2 uy2))
dy/2 lw/2)))))))
(define-ezd-command
`(line ,number? ,number? ,number? ,number?
(optional ,non-negative?) (optional ,color?) (optional ,dash?))
"(line x1 y1 x2 y2 [<line-width>] [<color>] [dash])"
line)
;;; A point is generated by the following procedure.
(define (POINT x y color)
(make-graphic
#f
(lambda ()
(let ((ux (user->x x))
(uy (user->y y)))
(list ux uy (+ ux 1) (+ uy 1))))
(if (eq? color 'clear)
draw-clear
(lambda ()
(xdrawpoint *dpy* *xwindow* (cv-gc 0 color #f #f #f #f)
(user->x x) (user->y y))))
(if (eq? color 'clear)
draw-clear
(lambda ()
(pscolor color)
(pscommand "newpath" x y "moveto" 0 (psypixel 1) "rlineto"
(psxpixel 1) 0 "rlineto" 0 (- (psypixel 1)) "rlineto"
"closepath" "fill")))
(lambda (minx miny maxx maxy) #t)))
(define-ezd-command
`(point ,number? ,number? (optional ,color?))
"(point x y [<color>])"
point)
|
ezd /src/line.sc