-- CGClipper.mesa-- Last changed by Doug Wyatt, August 23, 1982 3:33 pmDIRECTORY  CGArea USING [Ref],  CGReducer USING [Edge, Ref],  GraphicsBasic USING [Box, Vec];CGClipper: CEDAR DEFINITIONS = { OPEN GraphicsBasic;Ref: TYPE = REF Rep;Rep: TYPE = RECORD [  isbox: BOOLEAN, -- is the clipping area a single box?  isallboxes: BOOLEAN, -- are all clipping regions boxes?  size: NAT, -- length of clipping list  data: Data, -- list of clipping trapezoids  box: REF Box -- bounding box for clipper  ];Data: TYPE = REF DataRep;DataRep: TYPE = RECORD[SEQUENCE space: NAT OF Node];Node: TYPE = REF NodeRep;NodeRep: TYPE = RECORD [  isbox: BOOLEAN,  ymin,ymax,xmin,xmax: REAL,  edgeL,edgeR: CGReducer.Edge  ];Error: ERROR[type: ErrorType];ErrorType: TYPE = {bug};New: PROC[size: NAT _ 0] RETURNS[Ref];-- create a new clipper object with given initial sizeEmpty: PROC[self: Ref] RETURNS[BOOLEAN] = INLINE { RETURN[self.size=0] };-- is the current clip area empty?IsBox: PROC[self: Ref] RETURNS[BOOLEAN] = INLINE { RETURN[self.isbox] };-- is the current clip area a single rectangle?IsAllBoxes: PROC[self: Ref] RETURNS[BOOLEAN] = INLINE { RETURN[self.isallboxes] };-- are all pieces of the current clip area rectangles?Bounds: PROC[self: Ref] RETURNS[Box] = INLINE { RETURN[self.box^] };-- get bounds of the current clipping areaTestPoint: PROC[self: Ref, p: Vec] RETURNS[BOOLEAN];-- return TRUE iff the given point is within the clip areaTestBox: PROC[self: Ref, box: Box, reducer: CGReducer.Ref] RETURNS[BOOLEAN];-- test the given box against the clip area-- load relevant clipping edges into reducer-- return TRUE iff any edges were loadedGenerateBox: PROC[self: Ref, box: Box, reducer: CGReducer.Ref, area: CGArea.Ref];GenerateLine: PROC[self: Ref, p,q: Vec, area: CGArea.Ref];Load: PROC[self: Ref, reducer: CGReducer.Ref];-- load all clipping edges into reducerSetBox: PROC[self: Ref, box: Box];-- set the clip area to the given boxSetArea: PROC[self: Ref, area: CGArea.Ref];-- set the clip area to the given areaCopy: PROC[self: Ref] RETURNS[Ref];-- make a copy of the clipperAssign: PROC[self: Ref, copy: Ref];-- assign the clip area from another clipper}.      Э╩└  Ц"Mesa" styleШ IprocЪ─╧cIЬ╧k	Ь
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