wxWidgets/interface/pen.h

/////////////////////////////////////////////////////////////////////////////
// Name:        pen.h
// Purpose:     documentation for wxPen class
// Author:      wxWidgets team
// RCS-ID:      $Id$
// Licence:     wxWindows license
/////////////////////////////////////////////////////////////////////////////

/**
    @class wxPen
    @wxheader{pen.h}
    
    A pen is a drawing tool for drawing outlines. It is used for drawing
    lines and painting the outline of rectangles, ellipses, etc. It has a
    colour, a width and a style.
    
    @library{wxcore}
    @category{gdi}
    
    @stdobjects
    Objects:
    wxNullPen
    Pointers:
    wxRED_PEN
    
    wxCYAN_PEN
    
    wxGREEN_PEN
    
    wxBLACK_PEN
    
    wxWHITE_PEN
    
    wxTRANSPARENT_PEN
    
    wxBLACK_DASHED_PEN
    
    wxGREY_PEN
    
    wxMEDIUM_GREY_PEN
    
    wxLIGHT_GREY_PEN
    
    @seealso
    wxPenList, wxDC, wxDC::SetPen
*/
class wxPen : public wxGDIObject
{
public:
    //@{
    /**
        Copy constructor, uses @ref overview_trefcount "reference counting".
        
        @param colour 
        A colour object.
        
        @param colourName 
        A colour name.
        
        @param width 
        Pen width. Under Windows, the pen width cannot be greater than 1 if
        the style is wxDOT, wxLONG_DASH, wxSHORT_DASH, wxDOT_DASH, or wxUSER_DASH.
        
        @param stipple 
        A stipple bitmap.
        
        @param pen 
        A pointer or reference to a pen to copy.
        
        @param style 
        The style may be one of the following:
        
        wxSOLID
        
        
        Solid style.
        
        wxTRANSPARENT
        
        
        No pen is used.
        
        wxDOT
        
        
        Dotted style.
        
        wxLONG_DASH
        
        
        Long dashed style.
        
        wxSHORT_DASH
        
        
        Short dashed style.
        
        wxDOT_DASH
        
        
        Dot and dash style.
        
        wxSTIPPLE
        
        
        Use the stipple bitmap.
        
        wxUSER_DASH
        
        
        Use the user dashes: see SetDashes().
        
        wxBDIAGONAL_HATCH
        
        
        Backward diagonal hatch.
        
        wxCROSSDIAG_HATCH
        
        
        Cross-diagonal hatch.
        
        wxFDIAGONAL_HATCH
        
        
        Forward diagonal hatch.
        
        wxCROSS_HATCH
        
        
        Cross hatch.
        
        wxHORIZONTAL_HATCH
        
        
        Horizontal hatch.
        
        wxVERTICAL_HATCH
        
        
        Vertical hatch.
        
        @remarks Different versions of Windows and different versions of other
                   platforms support very different subsets of the
                   styles above - there is no similarity even between
                   Windows95 and Windows98 - so handle with care.
        
        @sa SetStyle(), SetColour(), SetWidth(), SetStipple()
    */
    wxPen();
        wxPen(const wxColour& colour, int width = 1,
              int style = wxSOLID);
        wxPen(const wxString& colourName, int width, int style);
        wxPen(const wxBitmap& stipple, int width);
        wxPen(const wxPen& pen);
    //@}

    /**
        Destructor.
        See @ref overview_refcountdestruct "reference-counted object destruction" for
        more info.
        
        @remarks Although all remaining pens are deleted when the application
                   exits, the application should try to clean up all
                   pens itself. This is because wxWidgets cannot know if
                   a pointer to the pen object is stored in an
                   application data structure, and there is a risk of
                   double deletion.
    */
    ~wxPen();

    /**
        Returns the pen cap style, which may be one of @b wxCAP_ROUND, @b
        wxCAP_PROJECTING and
        @b wxCAP_BUTT. The default is @b wxCAP_ROUND.
        
        @sa SetCap()
    */
    int GetCap();

    /**
        Returns a reference to the pen colour.
        
        @sa SetColour()
    */
    wxColour GetColour();

    /**
        Gets an array of dashes (defined as char in X, DWORD under Windows).
        @e dashes is a pointer to the internal array. Do not deallocate or store this
        pointer.
        The function returns the number of dashes associated with this pen.
        
        @sa SetDashes()
    */
    int GetDashes(wxDash** dashes);

    /**
        Returns the pen join style, which may be one of @b wxJOIN_BEVEL, @b
        wxJOIN_ROUND and
        @b wxJOIN_MITER. The default is @b wxJOIN_ROUND.
        
        @sa SetJoin()
    */
    int GetJoin();

    /**
        Gets a pointer to the stipple bitmap.
        
        @sa SetStipple()
    */
    wxBitmap* GetStipple();

    /**
        Returns the pen style.
        
        @sa wxPen(), SetStyle()
    */
    int GetStyle();

    /**
        Returns the pen width.
        
        @sa SetWidth()
    */
    int GetWidth();

    /**
        Returns @true if the pen is initialised.
    */
#define bool IsOk()     /* implementation is private */

    /**
        Sets the pen cap style, which may be one of @b wxCAP_ROUND, @b wxCAP_PROJECTING
        and
        @b wxCAP_BUTT. The default is @b wxCAP_ROUND.
        
        @sa GetCap()
    */
    void SetCap(int capStyle);

    //@{
    /**
        The pen's colour is changed to the given colour.
        
        @sa GetColour()
    */
    void SetColour(wxColour& colour);
        void SetColour(const wxString& colourName);
        void SetColour(unsigned char red, unsigned char green,
                       unsigned char blue);
    //@}

    /**
        Associates an array of pointers to dashes (defined as char in X, DWORD under
        Windows)
        with the pen. The array is not deallocated by wxPen, but neither must it be
        deallocated by the calling application until the pen is deleted or this
        function is called with a @NULL array.
        
        @sa GetDashes()
    */
    void SetDashes(int n, wxDash* dashes);

    /**
        Sets the pen join style, which may be one of @b wxJOIN_BEVEL, @b wxJOIN_ROUND
        and
        @b wxJOIN_MITER. The default is @b wxJOIN_ROUND.
        
        @sa GetJoin()
    */
    void SetJoin(int join_style);

    /**
        Sets the bitmap for stippling.
        
        @sa GetStipple()
    */
    void SetStipple(wxBitmap* stipple);

    /**
        Set the pen style.
        
        @sa wxPen()
    */
    void SetStyle(int style);

    /**
        Sets the pen width.
        
        @sa GetWidth()
    */
    void SetWidth(int width);

    /**
        Inequality operator.
        See @ref overview_refcountequality "reference-counted object comparison" for
        more info.
    */
    bool operator !=(const wxPen& pen);

    /**
        Assignment operator, using @ref overview_trefcount "reference counting".
    */
    wxPen operator =(const wxPen& pen);

    /**
        Equality operator.
        See @ref overview_refcountequality "reference-counted object comparison" for
        more info.
    */
    bool operator ==(const wxPen& pen);
};