-- File:	Prs3d_Projector.cdl
-- Created:	Fri Mar 19 09:51:20 1993
-- Author:	Jean-Louis FRENKEL
--		<jlf@phylox>
---Copyright:	 Matra Datavision 1993


class Projector from Prs3d inherits TShared from MMgt

	---Purpose: A projector object.
    	-- This object defines the parameters of a view for a
    	-- visualization algorithm. It is, for example, used by the
    	-- hidden line removal algorithms.

uses
    Projector from HLRAlgo,
        Length    from Quantity
is

    Create(Pr: Projector from HLRAlgo)
    returns mutable Projector from Prs3d;


    Create ( Pers: Boolean from Standard;
    	     Focus: Length from Quantity;
	     DX, DY, DZ: Length from Quantity;       -- Projection Vector
	     XAt, YAt , ZAt: Length from Quantity;   -- View Point
	     XUp, YUp, ZUp: Length from Quantity)    -- High Point Direction
    returns mutable Projector from Prs3d;
    	--- Purpose: Constructs a projector framework from the following parameters
    	-- -   Pers is true if the view is a perspective view and
    	--   false if it is an axonometric one;
    	-- -   Focus is the focal length if a perspective view is defined;
    	-- -   DX, DY and DZ are the coordinates of the
    	--   projection vector;
    	-- -   XAt, YAt and ZAt are the coordinates of the view point;
    	-- -   XUp, YUp and ZUp are the coordinates of the
    	--   vertical direction vector.   
        
    Projector(me) returns Projector from HLRAlgo
    is static;
    	---Purpose: Returns a projector object for use in a hidden line removal algorithm.
        
fields
    MyProjector: Projector from HLRAlgo;
end Projector;