SV2d: CEDAR DEFINITIONS =BEGINPoint2d: TYPE = ARRAY[1..2] OF REAL;Vector2d: TYPE = ARRAY[1..2] OF REAL;Matrix3by3: TYPE = ARRAY [1..3] OF ARRAY [1..3] OF REAL;Polygon: TYPE = REF PolygonObj;PolygonObj: TYPE = RECORD [len: NAT, seq: SEQUENCE maxVerts: NAT OF Point2d];Path: TYPE = REF PathObj;PathObj: TYPE = RECORD [len: NAT, seq: SEQUENCE maxVerts: NAT OF Point2d];TrigPolygon: TYPE = REF TrigPolygonObj;TrigPolygonObj: TYPE = RECORD [len: NAT, seq: SEQUENCE maxVerts: NAT OF TrigLineSeg];LineSeg: TYPE = REF LineSegObj;LineSegObj: TYPE = RECORD [p1, p2: Point2d,slope: REAL,xInt, yInt: REAL,isVert: BOOL];TrigLineSeg: TYPE = REF TrigLineSegObj;TrigLineSegObj: TYPE = RECORD [line: TrigLine,pLo, pHi: Point2d,pLoIsFirst: BOOL]; -- Are [pLo, pHi] in the same order as [v1, v2] (the segment endpoints as they are given to CreateTrigLineSeg)?TrigLine: TYPE = REF TrigLineObj;TrigLineObj: TYPE = RECORD [c: REAL, -- cos(theta)s: REAL, -- sin(theta)theta: REAL, -- angle in (-pi..pi]d: REAL, -- distance from line to originslope: REAL, -- slope and yInt are redundant information but they come almost for free.yInt: REAL];Ray2d: TYPE = REF Ray2dObj;Ray2dObj: TYPE = RECORD [p: Point2d,d: Vector2d];END.   n  File: SV2d.mesaAuthor: Eric Bier on August 20, 1982 11:39 amLast edited by Bier on September 4, 1986 2:56:43 pm PDTContents:  Definitions of data structures used to represent two dimensional entities, and procedures to support them.  Part of the Solidviews Three Dimensional Illustrator.Polygons and PathsA possible substitute for TrigLineSeg A TrigLine with endpoints pLo and pHi.pLo has lower y than pHi or the same y and lower x.Line equation of the form: y*cos(theta) - x*sin(theta) -d = 0,where theta is the angle which the line makes with the x axis and d is the distance from the line to the origin.Э╩┼  Ц"cedar" styleШ IheadЪЬЩIprocЪЬ-Щ-LЪЬ7Щ7LЪЬмЩмLШ LЪЬ╧kЬШLЪЭШLШ LЪ	Ь	ЭЬЭЬЭЬЭЬШ$LЪ	Ь
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