-- File:	Prs3d_DatumAspect.cdl
-- Created:	Fri Jul 30 09:32:13 1993
-- Author:	Jean-Louis FRENKEL
--		<jlf@stylox>
---Copyright:	 Matra Datavision 1993


class DatumAspect from Prs3d inherits CompositeAspect from Prs3d
    	---Purpose: A framework to define the display of datums.
uses

    LineAspect from Prs3d,
    Length from Quantity    
is

    Create returns mutable DatumAspect from Prs3d;
    	---Purpose: An empty framework to define the display of datums.
      
    FirstAxisAspect(me) returns mutable LineAspect from Prs3d;
    	---Purpose: Returns the attributes for display of the first axis.    
    SecondAxisAspect(me) returns mutable LineAspect from Prs3d;
    	---Purpose: Returns the attributes for display of the second axis.    
    ThirdAxisAspect(me) returns mutable LineAspect from Prs3d;
    	---Purpose: Returns the attributes for display of the third axis.    
    SetDrawFirstAndSecondAxis(me:mutable ; draw: Boolean from Standard);
    	---Purpose: Sets the DrawFirstAndSecondAxis attributes to active.    
    
    DrawFirstAndSecondAxis(me) returns Boolean from Standard; 
    	---Purpose: Returns true if the first and second axes can be drawn. 
    
    SetDrawThirdAxis(me:mutable; draw: Boolean from Standard);
    	---Purpose: Sets the DrawThirdAxis attributes to active.
    
    DrawThirdAxis(me) returns Boolean from Standard;
    	---Purpose: Returns true if the third axis can be drawn.    
    SetAxisLength(me:mutable; L1,L2,L3: Real from Standard);
    	---Purpose: Sets the lengths L1, L2 and L3 of the three axes. 
        
    FirstAxisLength(me) returns Length from Quantity;
    	--- Purpose: Returns the length of the displayed first axis.   
    
    SecondAxisLength(me) returns Length from Quantity;
    	---Purpose: Returns the length of the displayed second axis.    
    
    ThirdAxisLength(me) returns Length from Quantity;
    	---Purpose: Returns the length of the displayed third axis.    
    Print(me; s: in out OStream from Standard) is static;
    
fields

    myFirstAxisAspect: LineAspect from Prs3d;
    mySecondAxisAspect: LineAspect from Prs3d;
    myThirdAxisAspect: LineAspect from Prs3d;
    myDrawFirstAndSecondAxis: Boolean from Standard;
    myDrawThirdAxis: Boolean from Standard;
    myFirstAxisLength: Length from Quantity;    
    mySecondAxisLength: Length from Quantity;    
    myThirdAxisLength: Length from Quantity;    
end DatumAspect from Prs3d;