attrval.h

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// $Id: attrval.h 1445 2006-07-14 20:15:02Z phil $
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 */

// Defines AttributeValue and some derived classes 

#ifndef INC_ATTRVAL
#define INC_ATTRVAL

#include "doccoord.h"
#include "doccolor.h"
#include "ensure.h"
#include "attr.h"
#include "arrows.h"
#include "node.h"

class Path;
class RenderRegion;
class Node;
class NodeAttribute;
class BlendAttrParam;
class PathStrokerVector;

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

>   class AttributeValue : public CCObject

    Author:     Tim_Browse (Xara Group Ltd) <camelotdev@xara.com>
    Created:    26/01/94
    Purpose:    To encapsulate rendering attributes.  Derivations of NodeAttribute will
                hold an instance of this class (or derivation of it) to store the
                attribute information - this instance field should always be called 'Value'.
                An AttributeValue object is capable of being pushed onto and popped off the
                render context stack, and being rendered.  This is accomplished by using
                virtual functions to perform these operations.
    SeeAlso:    NodeAttribute; RenderStack

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

class AttributeValue : public CCObject
{
    CC_DECLARE_DYNCREATE(AttributeValue)
public:
    AttributeValue() {};
    virtual ~AttributeValue() {};

    virtual void Render(RenderRegion *, BOOL Temp = FALSE) = 0;
            // Called to "render" an attribute (makes it current for the first time)

    virtual void Restore(RenderRegion *, BOOL Temp) = 0;
            // Called to "restore" a stacked attribute (makes it current once more)

    virtual void GoingOutOfScope(RenderRegion *pRender) {};
            // Called when a current attribute goes out of scope
            // (only called once, when the attribute is "popped" from being current)
            // Used to allow us to remove any PathProcessor we may have added to the RndRgn

    virtual void SimpleCopy(AttributeValue *) = 0;
    virtual NodeAttribute *MakeNode();
    virtual NodeAttribute *MakeNode(Node* pContextNode, AttachNodeDirection Direction);
    virtual BOOL IsDifferent(AttributeValue*);

    // This blends the attribute value with the one provided by pBlendParam
    virtual BOOL Blend(BlendAttrParam* pBlendParam);

    virtual INT32 operator=(AttributeValue& Attrib) { return TRUE; }

public:
    virtual AttributeValue *MouldIntoStroke(PathStrokerVector *pMoulder, double TransScale = 1.0);
            // Moulds the attribute into the given Stroke envelope. This translates fill
            // handles, and scales transparency values and line widths (etc). The base class
            // does nothing.

    // There is only one case to date where AttributeValue are rendered directly ie without calling the render function of their
    // associated/containing NodeAttribute class. This occurs in RenderRegion::InitDevice().
    // This function is to determine if the AttributeValue can be rendered independently of the NodeAttribute.
    // It is only used in RR::InitDevice() at present but I am defining it in order to highlight this new characteristic of
    // nodes which are geometry dependent, in order to ensure that this becomes an acknowledged attribute design consideration
    // (ie so that these special cases get handled correctly by future code which may need to render attributes directly)
    virtual BOOL CanBeRenderedDirectly();
};

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

>   class LineWidthAttribute : public AttributeValue

    Author:     Tim_Browse (Xara Group Ltd) <camelotdev@xara.com>
    Created:    15/06/94
    Purpose:    Represent a line width of a path.  This may be a simple stroking operator
                such as a constant line width, or a complex one such as variable line
                widths or an airbrush stroke operator.
    SeeAlso:    FillColourAttribute; StrokeColourAttribute;
                StartArrowAttribute; EndArrowAttribute; StartCapAttribute; EndCapAttribute;
                JoinTypeAttribute; MitreLimitAttribute; WindingRuleAttribute;
                DashPatternAttribute

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

class LineWidthAttribute : public AttributeValue
{
    CC_DECLARE_DYNCREATE(LineWidthAttribute)
public:
    LineWidthAttribute();
    LineWidthAttribute(MILLIPOINT NewLineWidth) { LineWidth = NewLineWidth; }
    virtual void Restore(RenderRegion *, BOOL);
    virtual void Render(RenderRegion *, BOOL Temp = FALSE);
    virtual NodeAttribute *MakeNode();
    BOOL IsDifferent(AttributeValue *pAttr);
    virtual void SimpleCopy(AttributeValue *);

    // This blend the attribute value with the one provided by pBlendParam
    virtual BOOL Blend(BlendAttrParam* pBlendParam);

    // Extra virtual function for stroke type attributes.
    virtual BOOL RenderStroke(RenderRegion *, Path *) { return FALSE; }

    // Simplified colour for render regions that can only handle simple line widths.
    MILLIPOINT LineWidth;

    static BOOL Init();

public:
    virtual AttributeValue *MouldIntoStroke(PathStrokerVector *pMoulder, double TransScale = 1.0);
            // Moulds the attribute into the given Stroke envelope. This translates fill
            // handles, and scales transparency values and line widths (etc). The base class
            // does nothing.
};

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

>   class StartArrowAttribute : public AttributeValue

    Author:     Tim_Browse (Xara Group Ltd) <camelotdev@xara.com>
    Created:    26/01/94
    Purpose:    Attribute for start arrow type of paths.
    SeeAlso:    FillColourAttribute; StrokeColourAttribute; LineWidthAttribute;
                EndArrowAttribute; StartCapAttribute; EndCapAttribute;
                JoinTypeAttribute; MitreLimitAttribute; WindingRuleAttribute;
                DashPatternAttribute

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

class StartArrowAttribute : public AttributeValue
{
    CC_DECLARE_DYNCREATE(StartArrowAttribute)
public:
    virtual void Restore(RenderRegion *, BOOL);
    virtual void Render(RenderRegion *, BOOL Temp = FALSE);
    virtual void SimpleCopy(AttributeValue *);
    virtual NodeAttribute *MakeNode();
    BOOL IsDifferent(AttributeValue *pAttr);

    // The arrow style
    ArrowRec StartArrow;

    static BOOL Init();
};

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

>   class EndArrowAttribute : public AttributeValue

    Author:     Tim_Browse (Xara Group Ltd) <camelotdev@xara.com>
    Created:    26/01/94
    Purpose:    Attribute for end arrow type of paths.
    SeeAlso:    FillColourAttribute; StrokeColourAttribute; LineWidthAttribute;
                StartArrowAttribute; StartCapAttribute; EndCapAttribute;
                JoinTypeAttribute; MitreLimitAttribute; WindingRuleAttribute;
                DashPatternAttribute

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

class EndArrowAttribute : public AttributeValue
{
    CC_DECLARE_DYNCREATE(EndArrowAttribute)
public:
    virtual void Restore(RenderRegion *, BOOL);
    virtual void Render(RenderRegion *, BOOL Temp = FALSE);
    virtual void SimpleCopy(AttributeValue *);
    virtual NodeAttribute *MakeNode();
    BOOL IsDifferent(AttributeValue *pAttr);

    // The arrow style
    ArrowRec EndArrow;

    static BOOL Init();
};

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

>   class StartCapAttribute : public AttributeValue

    Author:     Tim_Browse (Xara Group Ltd) <camelotdev@xara.com>
    Created:    26/01/94
    Purpose:    Attribute for start cap style of paths.
    SeeAlso:    FillColourAttribute; StrokeColourAttribute; LineWidthAttribute;
                StartArrowAttribute; EndArrowAttribute; EndCapAttribute;
                JoinTypeAttribute; MitreLimitAttribute; WindingRuleAttribute;
                DashPatternAttribute

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

class StartCapAttribute : public AttributeValue
{
    CC_DECLARE_DYNCREATE(StartCapAttribute)
public:
    StartCapAttribute();

    virtual void Restore(RenderRegion *, BOOL);
    virtual void Render(RenderRegion *, BOOL Temp = FALSE);
    virtual void SimpleCopy(AttributeValue *);
    virtual NodeAttribute *MakeNode();
    virtual BOOL IsDifferent(AttributeValue*);

    // The cap style
    LineCapType StartCap;

    static BOOL Init();
};

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

>   class JoinTypeAttribute : public AttributeValue

    Author:     Tim_Browse (Xara Group Ltd) <camelotdev@xara.com>
    Created:    26/01/94
    Purpose:    Attribute for join types of paths.
    SeeAlso:    FillColourAttribute; StrokeColourAttribute; LineWidthAttribute;
                StartArrowAttribute; EndArrowAttribute; StartCapAttribute; EndCapAttribute;
                MitreLimitAttribute; WindingRuleAttribute; DashPatternAttribute

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

class JoinTypeAttribute : public AttributeValue
{
    CC_DECLARE_DYNCREATE(JoinTypeAttribute)
public:
    JoinTypeAttribute();

    virtual void Restore(RenderRegion *, BOOL);
    virtual void Render(RenderRegion *, BOOL Temp = FALSE);
    virtual void SimpleCopy(AttributeValue *);
    virtual NodeAttribute *MakeNode();
    virtual BOOL IsDifferent(AttributeValue*);

    // The join type
    JointType JoinType;

    static BOOL Init();
};

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

>   class MitreLimitAttribute : public AttributeValue

    Author:     Tim_Browse (Xara Group Ltd) <camelotdev@xara.com>
    Created:    26/01/94
    Purpose:    Attribute for mitre limits of paths.
    SeeAlso:    FillColourAttribute; StrokeColourAttribute; LineWidthAttribute;
                StartArrowAttribute; EndArrowAttribute; StartCapAttribute; EndCapAttribute;
                JoinTypeAttribute; WindingRuleAttribute; DashPatternAttribute

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

class MitreLimitAttribute : public AttributeValue
{
    CC_DECLARE_DYNCREATE(MitreLimitAttribute)
public:
    MitreLimitAttribute();

    virtual void Restore(RenderRegion *, BOOL);
    virtual void Render(RenderRegion *, BOOL Temp = FALSE);
    virtual void SimpleCopy(AttributeValue *);
    virtual NodeAttribute *MakeNode();
    BOOL IsDifferent(AttributeValue *pAttr);

    // The mitre limit
    MILLIPOINT MitreLimit;

    static BOOL Init();
};

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

>   class WindingRuleAttribute : public AttributeValue

    Author:     Tim_Browse (Xara Group Ltd) <camelotdev@xara.com>
    Created:    26/01/94
    Purpose:    Attribute for the winding rule of a path.
    SeeAlso:    FillColourAttribute; StrokeColourAttribute; LineWidthAttribute;
                StartArrowAttribute; EndArrowAttribute; StartCapAttribute; EndCapAttribute;
                JoinTypeAttribute; MitreLimitAttribute; DashPatternAttribute

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

class WindingRuleAttribute : public AttributeValue
{
    CC_DECLARE_DYNCREATE(WindingRuleAttribute)
public:
    WindingRuleAttribute();
    WindingRuleAttribute(WindingType NewRule) { WindingRule = NewRule; }

    virtual void Restore(RenderRegion *, BOOL);
    virtual void Render(RenderRegion *, BOOL Temp = FALSE);
    virtual void SimpleCopy(AttributeValue *);
    virtual NodeAttribute *MakeNode();
    virtual BOOL IsDifferent(AttributeValue*);

    // Winding rule
    WindingType WindingRule;

    static BOOL Init();
};

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

>   class DashPatternAttribute : public AttributeValue

    Author:     Tim_Browse (Xara Group Ltd) <camelotdev@xara.com>
    Created:    26/01/94
    Purpose:    Attribute for dash pattern style of paths.
    SeeAlso:    FillColourAttribute; StrokeColourAttribute; LineWidthAttribute;
                StartArrowAttribute; EndArrowAttribute; StartCapAttribute; EndCapAttribute;
                JoinTypeAttribute; MitreLimitAttribute; WindingRuleAttribute

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

class DashPatternAttribute : public AttributeValue
{
    CC_DECLARE_DYNCREATE(DashPatternAttribute)
public:
    DashPatternAttribute();
    ~DashPatternAttribute();

    BOOL SetDashPattern(DashRec& NewDash);
    BOOL SetStockDashPattern(StockDash NewDash);
    BOOL SetDeviceDashPattern(DashRec& NewDash, INT32 PixelSize);
    BOOL SetDeviceStockDashPattern(StockDash NewDash, INT32 PixelSize);
    INT32 operator==(DashPatternAttribute&);

    virtual void Restore(RenderRegion*, BOOL);
    virtual void Render(RenderRegion *, BOOL Temp = FALSE);
    virtual void SimpleCopy(AttributeValue*);
    virtual NodeAttribute* MakeNode();
    BOOL IsDifferent(AttributeValue *pAttr);

    // Dash pattern
    DashRec DashPattern;

    static BOOL Init();
};

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

>   class DrawingModeAttribute : public AttributeValue

    Author:     Tim_Browse (Xara Group Ltd) <camelotdev@xara.com>
    Created:    26/01/94
    Purpose:    Attribute for drawing mode - EOR, COPY etc.
    SeeAlso:    FillColourAttribute; StrokeColourAttribute; LineWidthAttribute;
                StartArrowAttribute; EndArrowAttribute; StartCapAttribute; EndCapAttribute;
                JoinTypeAttribute; MitreLimitAttribute; WindingRuleAttribute

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

class DrawingModeAttribute : public AttributeValue
{
    CC_DECLARE_DYNCREATE(DrawingModeAttribute)
public:
    DrawingModeAttribute() {}
    DrawingModeAttribute(DrawModeType NewDrawingMode) { DrawingMode = NewDrawingMode; }

    virtual void Restore(RenderRegion *, BOOL);
    virtual void Render(RenderRegion *, BOOL Temp = FALSE);
    virtual void SimpleCopy(AttributeValue *);
    virtual NodeAttribute *MakeNode();
    BOOL IsDifferent(AttributeValue *pAttr);

    // Drawing Mode
    DrawModeType DrawingMode;
    static UINT32 ID;
};



#endif // INC_ATTRVAL

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