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- ;;; -*- Mode:Lisp; Package:XLIB; Syntax:COMMON-LISP; Base:10; Lowercase:T -*-
-
- ;;; CLX interface for Bezier Spline Extension.
-
- ;;;
- ;;; TEXAS INSTRUMENTS INCORPORATED
- ;;; P.O. BOX 2909
- ;;; AUSTIN, TEXAS 78769
- ;;;
- ;;; Copyright (C) 1987 Texas Instruments Incorporated.
- ;;;
- ;;; Permission is granted to any individual or institution to use, copy, modify,
- ;;; and distribute this software, provided that this complete copyright and
- ;;; permission notice is maintained, intact, in all copies and supporting
- ;;; documentation.
- ;;;
- ;;; Texas Instruments Incorporated provides this software "as is" without
- ;;; express or implied warranty.
- ;;;
-
- (in-package :xlib)
-
- (export 'draw-curves)
-
- (define-extension "bezier")
-
- (defun draw-curves (drawable gcontext points)
- ;; Draw Bezier splines on drawable using gcontext.
- ;; Points are a list of (x0 y0 x1 y1 x2 y2 x3 y3)
- (declare (type drawable drawable)
- (type gcontext gcontext)
- (type sequence points))
- (let* ((display (drawable-display drawable))
- (opcode (extension-opcode display "bezier")))
- (with-buffer-request (display opcode :gc-force gcontext)
- ((data card8) 1) ;; X_PolyBezier - The minor_opcode for PolyBezier
- (drawable drawable)
- (gcontext gcontext)
- ((sequence :format int16) points))))
-