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;;;-*- Mode:Common-Lisp; Package:PICTURES; Base:10 -*-
;;;
;;;
;;;
;;; TEXAS INSTRUMENTS INCORPORATED
;;; P.O. BOX 149149
;;; AUSTIN, TEXAS 78714-9149
;;;
;;; Copyright (C)1987,1988,1989,1990 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.
;;;
;;; Authors: Delmar Hager, James Dutton, Teri Crowe
;;; Contributors: Kerry Kimbrough, Patrick Hogan, Eric Mielke
(in-package "PICTURES")
(export '(
make-polygon make-filled-polygon make-filled-polygon-edge
)
'pictures)
;Polygon Class Definition:
(defclass polygon (polypoint)
()
(:documentation "the graphic class for drawing a polygon on the screen"))
;Function: make-polygon
; Return a new polygon object.
(defun make-polygon (point-seq &rest options )
"Make a polygon with the coordinates contained in POINT-SEQ.
The following keyword OPTIONS are allowed:
GSTATE PARENT SENESITIVITY TRANSFORM PLIST"
(APPLY #'MAKE-INSTANCE 'polygon
:point-seq point-seq
options))
(defmethod draw-graphic ((polygon polygon) (view view)
&optional min-x min-y width height)
(declare (type (or null wcoord) min-x min-y width height))
(with-slots (vertices gstate sensitivity extent) polygon
(WHEN (visible-p polygon)
(WHEN (AND ( > (LENGTH vertices) 0) (viewable-p polygon))
(with-vector temp-vertices
(copy-to-vector vertices temp-vertices)
(transform-point-seq (graphic-world-transform polygon) temp-vertices)
(view-draw-polygon view temp-vertices
(graphic-gstate polygon)))))
))
(DEFMETHOD graphic-contains-p ((polygon polygon) x y &optional (pixel 1) )
(DECLARE (type wcoord x y) )
(when (point-in-extents-p polygon x y pixel)
(LET ((line-width
(OR (AND (graphic-gstate polygon)
(gstate-line-width polygon)
(+ (/ (gstate-line-width polygon) 2) pixel)) pixel)))
(with-slots (vertices transform) polygon
(with-vector temp-vertices
(copy-to-vector vertices temp-vertices)
(transform-point-seq (graphic-world-transform polygon) temp-vertices)
(point-near-line temp-vertices line-width x y))))))
;define the filled-polygon class
(defclass filled-polygon (polygon)
()
(:documentation "the graphic class for drawing a filled polygon on the screen"))
;Function: make-filled-polygon
; Return a new filled polygon object.
(defun make-filled-polygon (point-seq &rest options )
"Make a filled-polygon with the coordinates contained in POINT-SEQ.
The following keyword OPTIONS are allowed:
GSTATE PARENT SENESITIVITY TRANSFORM PLIST"
(APPLY #'MAKE-INSTANCE 'filled-polygon
:point-seq point-seq
options))
;(DEFMETHOD graphic-contains-p ((filled-polygon filled-polygon) x y &optional pixel)
; (DECLARE (type wcoord x y))
; (WHEN (point-in-extents-p filled-polygon x y pixel)
; (with-slots (vertices) filled-polygon
; (with-vector temp-vertices
; (copy-to-vector vertices temp-vertices)
; (transform-point-seq (graphic-world-transform filled-polygon) temp-vertices)
; (WHEN
; (inside-p temp-vertices (make-point :x x :y y)) t )))
; ))
(defmethod graphic-contains-p ((filled-polygon filled-polygon) x y &optional pixel)
;; A variation of the "area fill" algorithm (see Lane J. M. et al., ACM TOGS,
;; July, 1983, pp. 192-196). A series of triangles are formed connecting the
;; first vertex to the i'th and (1+ i)'th vertices. X/Y is inside the polygon
;; iff it is inside an odd number of these triangles.
(when (point-in-extents-p filled-polygon x y pixel)
(with-slots ( vertices) filled-polygon
(with-vector points
(copy-to-vector vertices points)
(transform-point-seq (graphic-world-transform filled-polygon) points)
(let*
( ;;(points (polygon-points polygon))
(p1x (elt points 0))
(p1y (elt points 1))
(p2x (elt points 2))
(p2y (elt points 3))
p3x p3y in-p)
(do ((i 4 (+ i 2)))
((>= i (length points))
in-p)
(setf p3x (elt points i)
p3y (elt points (1+ i)))
;; Point inside next triangle?
(when
;; Use cross product to test if point is on same
;; side of all triangle edges or if point lies on an edge.
(let ((sign1 (signum (- (* (- p1x x) (- p2y y))
(* (- p2x x) (- p1y y))))))
(or (zerop sign1)
(let ((sign2 (signum (- (* (- p2x x) (- p3y y))
(* (- p3x x) (- p2y y))))))
(or (zerop sign2)
(when (= sign1 sign2)
(let ((sign3 (signum (- (* (- p3x x) (- p1y y))
(* (- p1x x) (- p3y y))))))
(or (zerop sign3)
(= sign1 sign3))))))))
;; Yes, complement inside-ness
(setf in-p (not in-p)))
;; Prepare next triangle.
(setf p2x p3x p2y p3y)))))))
; Method for drawing a filled-polygon
(defmethod draw-graphic ((filled-polygon filled-polygon) (view view)
&optional min-x min-y width height)
(declare (type (or null wcoord) min-x min-y width height))
(with-slots (vertices gstate extent) filled-polygon
(WHEN (visible-p filled-polygon)
(WHEN (AND ( > (LENGTH vertices) 0) (viewable-p filled-polygon))
(with-vector temp-vertices
(copy-to-vector vertices temp-vertices)
(transform-point-seq
(graphic-world-transform filled-polygon) temp-vertices)
(view-draw-filled-polygon view temp-vertices
(graphic-gstate filled-polygon)))))))
;;define the filled-polygon-edge class
(defclass filled-polygon-edge ( filled-polygon edge) ;mixin the edge class
()
(:documentation
"the graphic class for drawing a filled polygon with edge on the screen"))
;Function: make-filled-polygon-edge
;return a filled-polygon-edge
(defun make-filled-polygon-edge (point-seq &rest options )
"Make a filled-polygon-edge with the coordinates contained in POINT-SEQ.
The following keyword OPTIONS are allowed: GSTATE PARENT SENESITIVITY TRANSFORM PLIST"
(APPLY #'MAKE-INSTANCE 'filled-polygon-edge
:point-seq point-seq
options))
; Return a new filled-polygon-edge object.
(defmethod draw-graphic ((filled-polygon-edge filled-polygon-edge) (view view)
&optional min-x min-y width height)
(declare (type (or null wcoord) min-x min-y width height))
(with-slots (vertices gstate edge-gstate extent) filled-polygon-edge
(when (visible-p filled-polygon-edge)
(WHEN (AND ( > (LENGTH vertices) 0) (viewable-p filled-polygon-edge))
(with-vector temp-vertices
(copy-to-vector vertices temp-vertices)
(transform-point-seq
(graphic-world-transform filled-polygon-edge) temp-vertices)
(view-draw-filled-polygon view temp-vertices
(graphic-gstate filled-polygon-edge))
(view-draw-polygon view temp-vertices
(edge-gstate filled-polygon-edge)))
))))
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