DIRECTORYBoxTree,InternalExpr,ImagerFont;BoxTreeImpl: CEDAR PROGRAM~ BEGINEXPR: TYPE ~ InternalExpr.EXPR;BoxTreeRep: TYPE ~RECORD [boundBox: ImagerBox.Box _ [0,0,0,0],  -- size of bounding boxoffset: Vector.VEC _[0,0],  -- offset from origin of parent boxsubBoxes: LIST OF BoxTree.BOXTREE _ NIL,  -- list of boxes bound by this boxparentBox: BoxTree.BOXTREE _ NIL, -- parent bounding boxstyle: BoxTree.STYLE,value: EXPR,  -- value of this boxexpression: EXPR  -- pointer to expression bound by this box];Format: PUBLIC PROC[box: BoxTree]  ~ {subExprBoxes: LIST OF BOX;myBox, tempBox: BOX;WITH box.value SELECT FROMatm: atomic => {AtomicFormat[atm, size]};fn: function => {box.subBoxes _ GetFormat[fn];   -- get format rule-- recursively format subexpressionsFOR l: LIST OF BoxTreeRep.subBoxes _ box.subBoxes, l.rest DOFormat[l.first]ENDLOOP;-- size boxesbox.boundBox _ BoundingBox[box.subBoxes];-- compose layoutLayOutBoxes[box.subBoxes];};ENDCASE => ERROR;};GetFormat: PROC [expr: function EXPR] RETURNS [LIST OF BoxTree.BOXTREE] ~ {boxlist : BOX.subBoxes;xi : INT _ 1;boxlist _ MakeBox[expr.name, [0,0]];FOR l: LIST OF EXPR _ expr.subExprs, l.next DO{xi _ xi + 1;boxlist _ CONS[MakeBox[l.first, [xi,0]], boxlist]};ENDLOOP;};MakeBox: PROC [exp: EXPR, offset: Vector.VEC RETURNS [BoxTree.BOXTREE] ~ {NEW[BoxTreeRep _ [offset: offset, value: exp, expression: exp]]};BoundingBox: PROC [boxes: LIST OF BoxTree.BOXTREE] RETURNS [ImagerBox.Box] ~ {biggestBox: ImagerBox.Box _ [0, 0, 0, 0];FOR l: LIST OF BoxTree.BOXTREE _ boxes, l.next DObiggestBox _  ImagerBox.BoundingBox[BiggestBox, l.first]ENDLOOP;RETURN [biggestBox]};LayOutBoxes: PROC [boxes: LIST OF BoxTree.BOXTREE]  ~ {-- compose layout of list of boxes using the relative offsets};Paint: PUBLIC PROC [boxTree: BOXTREE, context: Imager.Context, selections: LIST OF Selection];END.  А  BoxTreeImpl.mesaMcisaac, July 20, 1987 6:25:45 pm PDTImplementation for Displaying Mathematical ExpressionsType DefinitionsDisplay & Formatting local declarationslookup expression in data base and return a list of boxes for itdummy routine for nowcompute least greatest bounding box for list of boxespaints a boxed expression in the imager space given by context Э╩~  Ш JЪ╧cЩIcodeЪЬ%Щ%KЩ JЪ╧a6Щ6KЩ Ъ╨kr	Ш	JЪ╨rtШKЪЬШKЪЬШЧKШ KЪ╧nЬ╧kЬвШЪЬвШKШ KЪбЩЩ KЪвЬвЬвЬШJШ ЪЬвЬШЪвЬШKЪЬ&ЭШ=KЪЬвЬ
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