-- File:	Prs3d.cdl
-- Created:	Wed Aug 26 17:38:18 1992
-- Author:	Jean Louis FRENKEL
--		<jlf@mastox>
---Copyright:	 Matra Datavision 1992

package Prs3d

    	---Purpose: The Prs3d package provides the following services
	-- -   a presentation object (the context for all
	--   modifications to the display, its presentation will be
	--   displayed in every view of an active viewer)
	-- -   an attribute manager governing how objects such
	--   as color, width, and type of line are displayed;
	--   these are generic objects, whereas those in
	--   StdPrs are specific geometries and topologies.
	-- -   generic   algorithms providing default settings for
	--   objects such as points, curves, surfaces and shapes
	-- -   a root object which provides the abstract
	--   framework for the DsgPrs definitions at work in
	--   display of dimensions, relations and trihedra.
    
uses
	Graphic3d,
	Aspect,
        Quantity,
	MMgt,
	Standard,
        Adaptor3d,
	BRepAdaptor,
	Geom,
        CPnts,
    	GCPnts,
    	TopAbs,
	TopLoc,
	TopoDS,
	TopTools,
	TopExp,
    	HLRAlgo,
        TCollection,
	TColgp,
	Bnd,
	gp,
	Poly,
	TColStd
is  
        exception InvalidAngle inherits RangeError from Standard;
	
        enumeration TypeOfLinePicking is TOLP_Point,
	                                 TOLP_Segment
	end TypeOfLinePicking;

        class Presentation;
    	---Purpose: defines the presentation object. This object can be
    	--          displayed, highlighted, erased, etc... The output
    	--          of the presentation algorithms are sent in a
    	--          presentation object. A presentation object is attached
    	--          to a given Viewer.
    	
	---Category: Aspect classes.
	---Purpose: The aspect classes qualifies how to represent
	--          a given kind of object.
	--          

	
        deferred class BasicAspect;	
        class PointAspect;
    	class LineAspect;
	class ShadingAspect;
	class TextAspect;
        deferred class CompositeAspect;	
        class IsoAspect;
	class PlaneAspect;
        class ArrowAspect;	
	class LengthAspect;
	class AngleAspect;
	class RadiusAspect;
	class DatumAspect;

        class Drawer;
	---Purpose: qualifies how the presentation algorithms compute
	--          the presentation of a specific kind of object. 
	--          This includes for example color, width and type
	--          of lines, maximal chordial deviation, etc...
	--          A drawer includes an instance of the Aspect classes
	--          with particular default values.
	
        class Projector;
	---Purpose: defines the projection parameters for the hidden
	--          lines removal algorithm.
	
    	class PlaneSet;
	---Purpose: defines a set of planes used for a presentation
	--          by sections.
	-- 

    	deferred class Root;
	---Purpose: defines the root of the presentation algorithms.
	
        generic class Point;
	---Purpose: computes the presentation of objects to be
	--          seen as points.
	
        generic class Line;
	---Purpose: computes the presentation of objects to be
	--          seen as broken lines.
	
        --generic class WFSectionShape;
	---Purpose: computes the wireframe presentation of surfaces 
	--          by displaying planar sections.
	
	generic class WFDeflectionRestrictedFace;
	---Purpose: computes the wireframe presentation of faces with
	--          restrictions by displaying a given number of U and/or
	--          V isoparametric curves. The isoparametric curves are
	--          drawn with respect to a maximal chordial deviation.
	--          The presentation includes the restriction curves.
	
        
	generic class WFRestrictedFace;
	---Purpose: computes the wireframe presentation of faces with
	--          restrictions by displaying a given number of U and/or
	--          V isoparametric curves. The isoparametric curves are
	--          drawn with a fixed number of points.
	--          The presentation includes the restriction curves.
    

	generic class WFShape;
	---Purpose: computes the wireframe presentation of compound set 
	--          of faces, edges and vertices by displaying a given 
	--          number of U and/or V isoparametric curves. 
	


	
	---Category: Hidden lines removal algorithms.
	
	generic class HLRShape;
		     ---Purpose: computes the presentation of objects with
		     --          removal of their hidden lines for a specific
		     --          projector.
		     --          

	---Category: Shading algorithms.

        generic class SectionShapeTool;	
	
	generic class ShadedShape;
	
	
       	---Category: Basis construction elements.
        generic class Vector;
	generic class Datum;

        class LengthPresentation;
	
	class AnglePresentation;
	
	class Text;
	
	
        ---Category: Class signatures.
	--           
	generic class PointTool;
	---Purpose: describes the behaviour requested for a point presentation

	generic class LineTool;
	---Purpose: describes the behaviour requested for a line presentation

      
        generic class CurvePresentation;
	
        generic class RestrictionTool;
       	---Purpose: describes the behaviour requested for a restricted
	--          face presentation.

	class ShapeTool;
	---Purpose: describes the behaviour requested for a wireframe
	--          shape presentation.

	generic class HLRShapeTool;
	---Purpose: describes the behaviour requested for a shape
	--          presentation with hidden lines removal.
	 
	deferred generic class VectorTool;
	---Purpose: describes the behaviour requested for a vector
	--          presentation.
	
	deferred generic class DatumTool;
	---Purpose: describes the behaviour requested for a datum
	--          presentation.

        class Arrow;
	---Purpose: draws an arrow at a given location, with respect
	--          to a given direction. 
	 
	imported NListOfSequenceOfPnt; 
	imported NListIteratorListOfSequenceOfPnt;
	
        MatchSegment(X,Y,Z: Length from Quantity;
	             aDistance: Length from Quantity;
		     p1,p2: Pnt from gp;
                     dist: out Length from Quantity)
	returns Boolean from Standard;
end Prs3d;