tranform.h

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// $Id: tranform.h 751 2006-03-31 15:43:49Z alex $
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 */
// The Transformation Base Classes

/*
*/


#ifndef TRANFORM_INC
#define TRANFORM_INC

#include "ccobject.h"


class DocCoord;

/********************************************************************************************

>   class TransformBase : public CCObject

    Author:     Rik_Heywood (Xara Group Ltd) <camelotdev@xara.com>
    Created:    10/02/94
    Purpose:    The Transformation Base Class. This is an abstract class - you can only create
                instances of its derived classes. The Transformation classes are used to
                give a transparent interface to arbitary transformations on objects. Nodes
                do not need to be aware of what type of transformation is being applied or
                how is should be undone.
                This class contains two virtual function :-
                MonoOn virtual void Transform(DocCoord* Coords, INT32 NumCoords) MonoOff
                MonoOn virtual BOOL IsInvertable() MonoOff
                It also contains the following public member vars
                MonoOn BOOL TransLines;     // TRUE if Line Widths are to be transformed MonoOff
                MonoOn BOOL TransFills;     // TRUE if Fills are to be transformed MonoOff
    SeeAlso:    TransInvertable; TransNonInvertable

********************************************************************************************/

class TransformBase : public CCObject
{
CC_DECLARE_DYNAMIC(TransformBase);

public:
    TransformBase()
    {
        TransFills                  = TRUE;
        TransLines                  = TRUE;
        bSolidDrag                  = FALSE;
        bTransformYourChildren      = TRUE;
        bHaveTransformedChildren    = TRUE;
        bHaveTransformedCached      = TRUE;
        bHaveTransformedAllChildren = FALSE;
        bHaveTransformedAllCached   = FALSE;
    };
    virtual void Transform( DocCoord* Coords, INT32 NumCoords) = 0;
    virtual BOOL IsInvertable() = 0;
    virtual BOOL IsTranslation() {return FALSE;}

    // Other functions
    virtual FIXED16 GetScalar();

// vars
public:
    BOOL TransFills : 1;                    // Should the Fills be transformed
    BOOL TransLines : 1;                    // Should the line widths be transformed
    BOOL bSolidDrag : 1;                    // Should the object update itself fully so it can be rendered?

    BOOL bTransformYourChildren : 1;        // Should the object transform all its children (it might not need to if it can transform its cached data)
    BOOL bHaveTransformedChildren : 1;      // Feedback from Node: Node is fully transformed, including all children
    BOOL bHaveTransformedCached : 1;        // Feedback from Node: Node has transformed its cached data

    BOOL bHaveTransformedAllChildren : 1;   // Feedback from Iterator: All iterated nodes returned bHaveTransformedChildren;
    BOOL bHaveTransformedAllCached : 1;     // Feedback from Iterator: All iterated nodes returned bHaveTransformedCached;
};




/********************************************************************************************

>   class TransInvertable : public TransformBase

    Author:     Rik_Heywood (Xara Group Ltd) <camelotdev@xara.com>
    Created:    10/02/94
    Purpose:    One of the transformation base classes. All Transformations derived from this
                class can be inverted directly. ie Transforms that make use of a matrix can
                be inverted by inverting the matrix.
                This class adds the following virtual functions :-
                MonoOn virtual void Invert() MonoOff
    SeeAlso:    Trans2DMatrix

********************************************************************************************/

class TransInvertable : public TransformBase
{
CC_DECLARE_DYNAMIC(TransInvertable);

public:
    TransInvertable(){};
    virtual BOOL IsInvertable() { return TRUE; }
    virtual void Invert() = 0;
};




/********************************************************************************************

>   class TransNonInvertable : public TransformBase

    Author:     Rik_Heywood (Xara Group Ltd) <camelotdev@xara.com>
    Created:    10/02/94
    Purpose:    One of the Transformation base classes. All the transformations derived from
                this class can not be inverted. Transforms of this kind are considered to be
                one way mappings from the original coords. There is no way of getting the
                original coords back after they have been transformed by a class derived from
                this one. Examples include the Envelope transformation

********************************************************************************************/

class TransNonInvertable : public TransformBase
{
CC_DECLARE_DYNAMIC(TransNonInvertable);

public:
    TransNonInvertable(){};
    virtual BOOL IsInvertable() { return FALSE; }
};



#endif  // TRANFORM_INC

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