+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%% Name: pen.tex
+%% Purpose: wxPen docs
+%% Author:
+%% Modified by:
+%% Created:
+%% RCS-ID: $Id$
+%% Copyright: (c) wxWidgets
+%% License: wxWindows license
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
\section{\class{wxPen}}\label{wxpen}
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.
+colour, a width and a style.
\wxheading{Derived from}
\wxheading{Remarks}
-On a monochrome display, wxWindows shows all non-white pens as black.
+On a monochrome display, wxWidgets shows all non-white pens as black.
Do not initialize objects on the stack before the program commences,
since other required structures may not have been set up yet. Instead,
wxThePenList}, and calling the member function {\bf FindOrCreatePen}.
See the entry for \helpref{wxPenList}{wxpenlist}.
-wxPen uses a reference counting system, so assignments between brushes are very
-cheap. You can therefore use actual wxPen objects instead of pointers without
-efficiency problems. Once one wxPen object changes its data it will create its
-own pen data internally so that other pens, which previously shared the
+This class uses \helpref{reference counting and copy-on-write}{trefcount}
+internally so that assignments between two instances of this class are very
+cheap. You can therefore use actual objects instead of pointers without
+efficiency problems. If an instance of this class is changed it will create
+its own data internally so that other instances, which previously shared the
data using the reference counting, are not affected.
%TODO: an overview for wxPen.
\latexignore{\rtfignore{\wxheading{Members}}}
-\membersection{wxPen::wxPen}\label{wxpenconstr}
+\membersection{wxPen::wxPen}\label{wxpenctor}
\func{}{wxPen}{\void}
-Default constructor. The pen will be uninitialised, and \helpref{wxPen::Ok}{wxpenok} will
+Default constructor. The pen will be uninitialised, and \helpref{wxPen:IsOk}{wxpenisok} will
return false.
-\func{}{wxPen}{\param{const wxColour\&}{ colour}, \param{int}{ width}, \param{int}{ style}}
+\func{}{wxPen}{\param{const wxColour\&}{ colour}, \param{int}{ width = $1$}, \param{int}{ style = {\tt wxSOLID}}}
Constructs a pen from a colour object, pen width and style.
\func{}{wxPen}{\param{const wxPen\&}{ pen}}
-Copy constructor. This uses reference counting so is a cheap operation.
+Copy constructor, uses \helpref{reference counting}{trefcount}.
\wxheading{Parameters}
\end{itemize}
}
-\membersection{wxPen::\destruct{wxPen}}
+\membersection{wxPen::\destruct{wxPen}}\label{wxpendtor}
\func{}{\destruct{wxPen}}{\void}
Destructor.
+See \helpref{reference-counted object destruction}{refcountdestruct} for more info.
\wxheading{Remarks}
-The destructor may not delete the underlying pen object of the native windowing
-system, since wxBrush uses a reference counting system for efficiency.
-
Although all remaining pens are deleted when the application exits,
the application should try to clean up all pens itself. This is because
-wxWindows cannot know if a pointer to the pen object is stored in an
+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.
\membersection{wxPen::GetCap}\label{wxpengetcap}
\wxheading{See also}
-\helpref{wxPen::wxPen}{wxpenconstr}, \helpref{wxPen::SetStyle}{wxpensetstyle}
+\helpref{wxPen::wxPen}{wxpenctor}, \helpref{wxPen::SetStyle}{wxpensetstyle}
\membersection{wxPen::GetWidth}\label{wxpengetwidth}
\helpref{wxPen::SetWidth}{wxpensetwidth}
-\membersection{wxPen::Ok}\label{wxpenok}
+\membersection{wxPen::IsOk}\label{wxpenisok}
-\constfunc{bool}{Ok}{\void}
+\constfunc{bool}{IsOk}{\void}
Returns true if the pen is initialised.
\func{void}{SetColour}{\param{const wxString\& }{colourName}}
-\func{void}{SetColour}{\param{int}{ red}, \param{int}{ green}, \param{int}{ blue}}
+\func{void}{SetColour}{\param{unsigned char}{ red}, \param{unsigned char}{ green}, \param{unsigned char}{ blue}}
The pen's colour is changed to the given colour.
\membersection{wxPen::SetJoin}\label{wxpensetjoin}
-\func{void}{SetJoin}{\param{int}{join\_style}}
+\func{void}{SetJoin}{\param{int }{join\_style}}
Sets the pen join style, which may be one of {\bf wxJOIN\_BEVEL}, {\bf wxJOIN\_ROUND} and
\rtfsp{\bf wxJOIN\_MITER}. The default is {\bf wxJOIN\_ROUND}.
\wxheading{See also}
-\helpref{wxPen::wxPen}{wxpenconstr}
+\helpref{wxPen::wxPen}{wxpenctor}
\membersection{wxPen::SetWidth}\label{wxpensetwidth}
\func{wxPen\&}{operator $=$}{\param{const wxPen\& }{pen}}
-Assignment operator, using reference counting. Returns a reference
-to `this'.
+Assignment operator, using \helpref{reference counting}{trefcount}.
\membersection{wxPen::operator $==$}\label{wxpenequals}
\func{bool}{operator $==$}{\param{const wxPen\& }{pen}}
-Equality operator. Two pens are equal if they contain pointers
-to the same underlying pen data. It does not compare each attribute,
-so two independently-created pens using the same parameters will
-fail the test.
+Equality operator.
+See \helpref{reference-counted object comparison}{refcountequality} for more info.
\membersection{wxPen::operator $!=$}\label{wxpennotequals}
\func{bool}{operator $!=$}{\param{const wxPen\& }{pen}}
-Inequality operator. Two pens are not equal if they contain pointers
-to different underlying pen data. It does not compare each attribute.
+Inequality operator.
+See \helpref{reference-counted object comparison}{refcountequality} for more info.
\section{\class{wxPenList}}\label{wxpenlist}
`memory leaks'. However, it is best not to rely on this automatic
cleanup because it can lead to double deletion in some circumstances.
-There are two mechanisms in recent versions of wxWindows which make the
+There are two mechanisms in recent versions of wxWidgets which make the
pen list less useful than it once was. Under Windows, scarce resources
are cleaned up internally if they are not being used. Also, a referencing
counting mechanism applied to all GDI objects means that some sharing
your application is using too many resources, you can resort to using
GDI lists to share objects explicitly.
-The only compelling use for the pen list is for wxWindows to keep
+The only compelling use for the pen list is for wxWidgets to keep
track of pens in order to clean them up on exit. It is also kept for
-backward compatibility with earlier versions of wxWindows.
+backward compatibility with earlier versions of wxWidgets.
\wxheading{See also}
\latexignore{\rtfignore{\wxheading{Members}}}
-\membersection{wxPenList::wxPenList}
+\membersection{wxPenList::wxPenList}\label{wxpenlistctor}
\func{void}{wxPenList}{\void}
Constructor. The application should not construct its own pen list:
use the object pointer {\bf wxThePenList}.
-\membersection{wxPenList::AddPen}\label{wxpenlistaddpen}
-
-\func{void}{AddPen}{\param{wxPen*}{ pen}}
-
-Used internally by wxWindows to add a pen to the list.
-
\membersection{wxPenList::FindOrCreatePen}\label{wxpenlistfindorcreatepen}
\func{wxPen*}{FindOrCreatePen}{\param{const wxColour\& }{colour}, \param{int}{ width}, \param{int}{ style}}
\docparam{width}{Width of pen.}
-\docparam{style}{Pen style. See \helpref{wxPen::wxPen}{wxpenconstr} for a list of styles.}
-
-\membersection{wxPenList::RemovePen}\label{wxpenlistremovepen}
-
-\func{void}{RemovePen}{\param{wxPen*}{ pen}}
-
-Used by wxWindows to remove a pen from the list.
-
+\docparam{style}{Pen style. See \helpref{wxPen::wxPen}{wxpenctor} for a list of styles.}
projects / wxWidgets.git / blobdiff