added wxWindow::IsVisible() method

[wxWidgets.git] / docs / latex / wx / dc.tex

diff --git a/docs/latex/wx/dc.tex b/docs/latex/wx/dc.tex
index febf46d1503fdbcec37f71441fc11ab1a433991e..e0f3256f499c1c592a4992fc047ff08e30c8fb1a 100644 (file)
--- a/docs/latex/wx/dc.tex
+++ b/docs/latex/wx/dc.tex
@@ -6,8 +6,10 @@ so a window can have a device context associated with it, and a printer also has
 In this way, the same piece of code may write to a number of different devices,
 if the device context is used as a parameter.
 
 In this way, the same piece of code may write to a number of different devices,
 if the device context is used as a parameter.
 

-Derived types of wxDC have documentation for specific features
-only, so refer to this section for most device context information.
+Notice that wxDC is an abstract base class and can't be created directly,
+please use \helpref{wxPaintDC}{wxpaintdc}, \helpref{wxClientDC}{wxclientdc}, 
+\helpref{wxWindowDC}{wxwindowdc}, \helpref{wxScreenDC}{wxscreendc}, 
+\helpref{wxMemoryDC}{wxmemorydc} or \helpref{wxPrinterDC}{wxprinterdc}.

 
 % VZ: we should really document them instead of this lame excuse, but I don't
 %     have time for it now, when it is done please remove this
 
 % VZ: we should really document them instead of this lame excuse, but I don't
 %     have time for it now, when it is done please remove this


@@ -16,6 +18,12 @@ there are also versions which accept single {\tt wxPoint} parameter instead of
 two {\tt wxCoord} ones or {\tt wxPoint} and {\tt wxSize} instead of four of
 them.
 
 two {\tt wxCoord} ones or {\tt wxPoint} and {\tt wxSize} instead of four of
 them.
 

+\wxheading{Support for Transparency / Alpha Channel}
+
+On Mac OS X when using Core Graphics (wx\_MAC\_USE\_CORE\_GRAPHICS set to 1) 
+colors with alpha are supported, so instances  {\tt wxPen} or  {\tt wxBrush} that are built from  {\tt wxColour} use
+the color's alpha values when stroking or filling.
+

 \wxheading{Derived from}
 
 \helpref{wxObject}{wxobject}
 \wxheading{Derived from}
 
 \helpref{wxObject}{wxobject}


@@ -31,36 +39,6 @@ them.
 \latexignore{\rtfignore{\wxheading{Members}}}
 
 
 \latexignore{\rtfignore{\wxheading{Members}}}
 
 

-\membersection{wxDC::wxDC}\label{wxdcctor}
-
-\func{}{wxDC}{\void}
-
-Constructor.
-
-
-\membersection{wxDC::\destruct{wxDC}}\label{wxdcdtor}
-
-\func{}{\destruct{wxDC}}{\void}
-
-Destructor.
-
-
-\membersection{wxDC::BeginDrawing}\label{wxdcbegindrawing}
-
-\func{void}{BeginDrawing}{\void}
-
-Allows optimization of drawing code under MS Windows. Enclose
-drawing primitives between {\bf BeginDrawing} and {\bf EndDrawing}\rtfsp
-calls.
-
-Drawing to a wxDialog panel device context outside of a
-system-generated OnPaint event {\it requires} this pair of calls to
-enclose drawing code. This is because a Windows dialog box does not have
-a retained device context associated with it, and selections such as pen
-and brush settings would be lost if the device context were obtained and
-released for each drawing operation.
-
-

 \membersection{wxDC::Blit}\label{wxdcblit}
 
 \func{bool}{Blit}{\param{wxCoord}{ xdest}, \param{wxCoord}{ ydest}, \param{wxCoord}{ width}, \param{wxCoord}{ height},
 \membersection{wxDC::Blit}\label{wxdcblit}
 
 \func{bool}{Blit}{\param{wxCoord}{ xdest}, \param{wxCoord}{ ydest}, \param{wxCoord}{ width}, \param{wxCoord}{ height},


@@ -486,7 +464,7 @@ which is.
 
 \membersection{wxDC::DrawRoundedRectangle}\label{wxdcdrawroundedrectangle}
 
 
 \membersection{wxDC::DrawRoundedRectangle}\label{wxdcdrawroundedrectangle}
 

-\func{void}{DrawRoundedRectangle}{\param{wxCoord}{ x}, \param{wxCoord}{ y}, \param{wxCoord}{ width}, \param{wxCoord}{ height}, \param{double}{ radius = 20}}
+\func{void}{DrawRoundedRectangle}{\param{wxCoord}{ x}, \param{wxCoord}{ y}, \param{wxCoord}{ width}, \param{wxCoord}{ height}, \param{double}{ radius}}

 
 Draws a rectangle with the given top left corner, and with the given
 size.  The corners are quarter-circles using the given radius. The
 
 Draws a rectangle with the given top left corner, and with the given
 size.  The corners are quarter-circles using the given radius. The


@@ -504,12 +482,15 @@ the rectangle.
 
 \membersection{wxDC::DrawSpline}\label{wxdcdrawspline}
 
 
 \membersection{wxDC::DrawSpline}\label{wxdcdrawspline}
 

+\func{void}{DrawSpline}{\param{int }{n}, \param{wxPoint }{points[]}}
+
+Draws a spline between all given control points, using the current
+pen.
+

 \func{void}{DrawSpline}{\param{wxList *}{points}}
 
 Draws a spline between all given control points, using the current
 \func{void}{DrawSpline}{\param{wxList *}{points}}
 
 Draws a spline between all given control points, using the current

-pen.  Doesn't delete the wxList and contents. The spline is drawn
-using a series of lines, using an algorithm taken from the X drawing
-program `XFIG'.
+pen.  Doesn't delete the wxList and contents.

 
 \func{void}{DrawSpline}{\param{wxCoord}{ x1}, \param{wxCoord}{ y1}, \param{wxCoord}{ x2}, \param{wxCoord}{ y2}, \param{wxCoord}{ x3}, \param{wxCoord}{ y3}}
 
 
 \func{void}{DrawSpline}{\param{wxCoord}{ x1}, \param{wxCoord}{ y1}, \param{wxCoord}{ x2}, \param{wxCoord}{ y2}, \param{wxCoord}{ x3}, \param{wxCoord}{ y3}}
 


@@ -565,15 +546,6 @@ wxUSE\_DC\_CACHEING preprocessor symbol for portability.
 Ends a document (only relevant when outputting to a printer).
 
 
 Ends a document (only relevant when outputting to a printer).
 
 

-\membersection{wxDC::EndDrawing}\label{wxdcenddrawing}
-
-\func{void}{EndDrawing}{\void}
-
-Allows optimization of drawing code under MS Windows. Enclose
-drawing primitives between {\bf BeginDrawing} and {\bf EndDrawing}\rtfsp
-calls.
-
-

 \membersection{wxDC::EndPage}\label{wxdcendpage}
 
 \func{void}{EndPage}{\void}
 \membersection{wxDC::EndPage}\label{wxdcendpage}
 
 \func{void}{EndPage}{\void}


@@ -656,7 +628,10 @@ rectangle are returned as a tuple.}
 
 \constfunc{const wxFont\&}{GetFont}{\void}
 
 
 \constfunc{const wxFont\&}{GetFont}{\void}
 

-Gets the current font (see \helpref{wxDC::SetFont}{wxdcsetfont}).
+Gets the current font. Notice that even although each device context object has
+some default font after creation, this method would return a \texttt{wxNullFont} 
+initially and only after calling \helpref{wxDC::SetFont}{wxdcsetfont} a valid
+font is returned.

 
 
 \membersection{wxDC::GetLogicalFunction}\label{wxdcgetlogicalfunction}
 
 
 \membersection{wxDC::GetLogicalFunction}\label{wxdcgetlogicalfunction}


@@ -678,12 +653,12 @@ Gets the {\it mapping mode} for the device context (see \helpref{wxDC::SetMapMod
 \constfunc{bool}{GetPartialTextExtents}{\param{const wxString\&  }{text}, 
 \param{wxArrayInt\& }{widths}}
 
 \constfunc{bool}{GetPartialTextExtents}{\param{const wxString\&  }{text}, 
 \param{wxArrayInt\& }{widths}}
 

-Fills the {\it widths} array with the widths from the begining of 
-{\it text} to the coresponding character of {\it text}.  The generic
+Fills the {\it widths} array with the widths from the beginning of 
+{\it text} to the corresponding character of {\it text}.  The generic

 version simply builds a running total of the widths of each character
 using \helpref{GetTextExtent}{wxdcgettextextent}, however if the
 various platforms have a native API function that is faster or more
 version simply builds a running total of the widths of each character
 using \helpref{GetTextExtent}{wxdcgettextextent}, however if the
 various platforms have a native API function that is faster or more

-accurate than the generic implementaiton then it should be used
+accurate than the generic implementation then it should be used

 instead. 
 
 \pythonnote{This method only takes the {\it text} parameter and
 instead. 
 
 \pythonnote{This method only takes the {\it text} parameter and


@@ -701,9 +676,11 @@ Gets the current pen (see \helpref{wxDC::SetPen}{wxdcsetpen}).
 
 \func{bool}{GetPixel}{\param{wxCoord}{ x}, \param{wxCoord}{ y}, \param{wxColour *}{colour}}
 
 
 \func{bool}{GetPixel}{\param{wxCoord}{ x}, \param{wxCoord}{ y}, \param{wxColour *}{colour}}
 

-Sets {\it colour} to the colour at the specified location.
+Gets in {\it colour} the colour at the specified location.

 Not available for wxPostScriptDC or wxMetafileDC.
 
 Not available for wxPostScriptDC or wxMetafileDC.
 

+Note that setting a pixel can be done using \helpref{DrawPoint}{wxdcdrawpoint}.
+

 \pythonnote{For wxPython the wxColour value is returned and is not
 required as a parameter.}
 
 \pythonnote{For wxPython the wxColour value is returned and is not
 required as a parameter.}
 


@@ -779,10 +756,8 @@ dimension from the baseline of the font to the bottom of the
 descender, and {\it externalLeading} is any extra vertical space added
 to the font by the font designer (usually is zero).
 
 descender, and {\it externalLeading} is any extra vertical space added
 to the font by the font designer (usually is zero).
 

-The optional parameter {\it font} specifies an alternative
-to the currently selected font: but note that this does not
-yet work under Windows, so you need to set a font for
-the device context first.
+If the optional parameter {\it font} is specified and valid, then it is used
+for the text extent calculation. Otherwise the currently selected font is.

 
 See also \helpref{wxFont}{wxfont}, \helpref{wxDC::SetFont}{wxdcsetfont}.
 
 
 See also \helpref{wxFont}{wxfont}, \helpref{wxDC::SetFont}{wxdcsetfont}.
 


@@ -817,6 +792,35 @@ Gets the current user scale factor (set by \helpref{SetUserScale}{wxdcsetusersca
  array {\tt ( x, y )}}
 
 
  array {\tt ( x, y )}}
 
 

+\membersection{wxDC::GradientFillConcentric}\label{wxdcgradientfillconcentric}
+
+\func{void}{GradientFillConcentric}{\param{const wxRect\&}{ rect}, \param{const wxColour\&}{ initialColour}, \param{const wxColour\&}{ destColour}}
+
+\func{void}{GradientFillConcentric}{\param{const wxRect\&}{ rect}, \param{const wxColour\&}{ initialColour}, \param{const wxColour\&}{ destColour}, \param{const wxPoint\& }{circleCenter}}
+
+Fill the area specified by rect with a radial gradient, starting from 
+\arg{initialColour} at the centre of the circle and fading to \arg{destColour} 
+on the circle outside.
+
+\arg{circleCenter} are the relative coordinates of centre of the circle in
+the specified \arg{rect}. If not specified, the cercle is placed at the
+centre of rect.
+
+\textbf{Note: } Currently this function is very slow, don't use it for
+real-time drawing.
+
+
+\membersection{wxDC::GradientFillLinear}\label{wxdcgradientfilllinear}
+
+\func{void}{GradientFillLinear}{\param{const wxRect\&}{ rect}, \param{const wxColour\&}{ initialColour}, \param{const wxColour\&}{ destColour}, \param{wxDirection}{ nDirection = wxEAST}}
+
+Fill the area specified by \arg{rect} with a linear gradient, starting from 
+\arg{initialColour} and eventually fading to \arg{destColour}. The 
+\arg{nDirection} specifies the direction of the colour change, default is to
+use \arg{initialColour} on the left part of the rectangle and 
+\arg{destColour} on the right one.
+
+

 \membersection{wxDC::LogicalToDeviceX}\label{wxdclogicaltodevicex}
 
 \func{wxCoord}{LogicalToDeviceX}{\param{wxCoord}{ x}}
 \membersection{wxDC::LogicalToDeviceX}\label{wxdclogicaltodevicex}
 
 \func{wxCoord}{LogicalToDeviceX}{\param{wxCoord}{ x}}


@@ -904,8 +908,8 @@ doesn't contain anything.
                                 \param{bool}{ yBottomUp}}
 
 Sets the x and y axis orientation (i.e., the direction from lowest to
                                 \param{bool}{ yBottomUp}}
 
 Sets the x and y axis orientation (i.e., the direction from lowest to

-highest values on the axis). The default orientation is the natural
-orientation, e.g. x axis from left to right and y axis from bottom up.
+highest values on the axis). The default orientation is 
+x axis from left to right and y axis from top down.

 
 \wxheading{Parameters}
 
 
 \wxheading{Parameters}
 


@@ -1115,7 +1119,7 @@ Sets the user scaling factor, useful for applications which require
 \func{bool}{StartDoc}{\param{const wxString\& }{message}}
 
 Starts a document (only relevant when outputting to a printer).
 \func{bool}{StartDoc}{\param{const wxString\& }{message}}
 
 Starts a document (only relevant when outputting to a printer).

-Message is a message to show whilst printing.
+Message is a message to show while printing.

 
 
 \membersection{wxDC::StartPage}\label{wxdcstartpage}
 
 
 \membersection{wxDC::StartPage}\label{wxdcstartpage}


@@ -1123,41 +1127,3 @@ Message is a message to show whilst printing.
 \func{bool}{StartPage}{\void}
 
 Starts a document page (only relevant when outputting to a printer).
 \func{bool}{StartPage}{\void}
 
 Starts a document page (only relevant when outputting to a printer).

-
-\section{\class{wxDCClipper}}\label{wxdcclipper}
-
-This is a small helper class which sets the specified DC to its constructor
-clipping region and then automatically destroys it in its destructor. Using
-it ensures that an unwanted clipping region is not left set on the DC.
-
-\wxheading{Derived from}
-
-No base class
-
-\wxheading{Include files}
-
-<wx/dc.h>
-
-\wxheading{See also}
-
-\helpref{wxDC}{wxdc}
-
-\latexignore{\rtfignore{\wxheading{Members}}}
-
-
-\membersection{wxDCClipper::wxDCClipper}\label{wxdcclipperctor}
-
-\func{}{wxDCClipper}{\param{wxDC\& }{dc}, \param{wxCoord }{x},\param{wxCoord }{y},\param{wxCoord }{w},\param{wxCoord }{h},}
-
-\func{}{wxDCClipper}{\param{wxDC\& }{dc}, \param{const wxRect\&}{ rect}}
-
-Constructor: sets the the clipping region for the given device context to the
-specified rectangle.
-
-
-\membersection{wxDCClipper::\destruct{wxDCClipper}}\label{wxdcclipperdtor}
-
-\func{}{\destruct{wxDCClipper}}{\void}
-
-Destructor: destroys the clipping region set in the constructor.
-