-- File:	  WNT_ImageManager.cdl
-- Created:	  Mon Mar 11 10:51:39 1996
-- Author:	  PLOTNIKOV Eugeny <eugeny@maniax>
-- Modifications: PLOTNIKOV Eugeny at July 1998 (BUC60286)
---Copyright:	  Matra Datavision 1996


class ImageManager from WNT inherits TShared from MMgt

	---Purpose: This class defines image management

 uses

    Handle          from Aspect,
    Window          from WNT,
    SequenceOfImage from WNT,
    TypeOfImage     from WNT,
    Image           from WNT,
    WindowPtr       from WNT

 is

    Create ( aWindow : WindowPtr from WNT )
     returns mutable ImageManager from WNT;
	---Purpose: Creates a class instance

    Destroy ( me : mutable )
     is virtual;
	---Purpose: Deletes all resources associated with the class instance.
	---C++:     alias ~

    SetFormat ( me : mutable; aFormat : TypeOfImage from WNT = WNT_TOI_XWD )
     is static;
	---Purpose: Sets image format for output.

    Add ( me : mutable; anImage : Image from WNT )
     is static;
	---Purpose: Adds <anImage> to manager.

    Image ( me : mutable; anIndex : Integer from Standard )
     returns Image from WNT is static;
	---Purpose: returns Image stored at <anIndex>.

    Load ( me : mutable; aFileName : CString from Standard )
     returns Integer from Standard
     is static;
	---Purpose: Loads image from file and returns its index in the
        --          sequence.
	--  Warning: Returns 0 if loading was failed.                   

    Save (
     me;
     aFileName               : CString from Standard;
     aX, aY, aWidth, aHeight : Integer from Standard
    )
     returns Boolean from Standard
     is static;
	---Purpose: Stories image to the file according to <myFormat>
        --          class field. Returns True on success, otherwise
        --          returns False.

    SaveBuffer (
     me;
     aFileName               : CString from Standard;
     aX, aY, aWidth, aHeight : Integer from Standard
    )
     returns Boolean from Standard
     is static;
	---Purpose: Stories contents of the double buffer window pixmap.
        --          See "Save" method.

    Draw (
     me      : mutable;
     anIndex : Integer from Standard;
     Xc, Yc  : Integer from Standard;
     aWidth  : Integer from Standard;
     aHeight : Integer from Standard;
     anAngle : Real    from Standard = 0.0
    )
     is static;
	---Purpose: Displays the image according to the DoubleBuffer state
        --          of the associated window.

    Delete ( me : mutable; anIndex : Integer from Standard )
     is static;
	---Purpose: Deletes an image at index <anIndex>.

    Discard ( me : mutable; anIndex : Integer from Standard )
     is static;
    ---Purpose: Places an image to the trash

    Scale (
     me       : mutable;
     anIndex  : Integer from Standard;
     aScaleX  : Real    from Standard;
     aScaleY  : Real    from Standard;
     aReplace : Boolean from Standard = Standard_False
    ) returns Handle from Aspect is static;
	---Purpose: Scales the specified image.

    Size ( me ) returns Integer from Standard is static;
        ---Purpose: Returns number of loaded images.

    ImageHandle (
     me      : mutable;
     anIndex : Integer from Standard
    ) returns Handle from Aspect is static;
	---Purpose: Returns image handle.

    Dim (
     me              : mutable;
     anIndex         :     Integer from Standard;
     aWidth, aHeight : out Integer from Standard
    )
     is static;
	---Purpose: Returns image dimensions.

    HashCode (
     me      : mutable;
     anIndex : Integer from Standard
    )
     returns Integer from Standard is redefined static;
	---Purpose: Returns image's hash code.

    Index (
     me        : mutable;
     aHashCode : Integer from Standard
    )
     returns Integer from Standard is static;
	---Purpose: Returns image's index.

    StringHashCode (
     me      : mutable;
     aString : CString from Standard
    )
     returns Integer from Standard is static;
	---Purpose: Returns hash code of the string.

    Open (
     me        : mutable;
     aDC       : Handle  from Aspect;
     aWidth    : Integer from Standard;
     aHeight   : Integer from Standard;
     aHashCode : Integer from Standard
    )
     returns Integer from Standard is static;
    ---Purpose: Creates new empty image and returns its index

 fields

    myWindow    : Address         from Standard is protected;
    myImages    : SequenceOfImage from WNT      is protected;
    myTrash     : SequenceOfImage from WNT      is protected;
    myFormat    : TypeOfImage     from WNT      is protected;
    myLastImage : Image           from WNT      is protected;
    myLastIndex : Integer         from Standard is protected;

 friends
 
    class WDriver from WNT,
    class Window  from WNT

end ImageManager;