X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/fc2171bd4c660b8554dae2a1cbf34ff09f3032a6..8d1517cef26509f5b2fca218145af4e4db7a4be2:/docs/latex/wx/dc.tex diff --git a/docs/latex/wx/dc.tex b/docs/latex/wx/dc.tex index d609a8eaec..c7242bf74f 100644 --- 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. -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 @@ -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. +\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} @@ -31,36 +39,6 @@ them. \latexignore{\rtfignore{\wxheading{Members}}} -\membersection{wxDC::wxDC} - -\func{}{wxDC}{\void} - -Constructor. - - -\membersection{wxDC::\destruct{wxDC}} - -\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}, @@ -193,6 +171,15 @@ wxUSE\_DC\_CACHEING preprocessor symbol for portability. \end{comment} +\membersection{wxDC::ComputeScaleAndOrigin}\label{wxdccomputescaleandorigin} + +\func{virtual void}{ComputeScaleAndOrigin}{\void} + +Performs all necessary computations for given platform and context type +after each change of scale and origin parameters. Usually called automatically +internally after such changes. + + \membersection{wxDC::CrossHair}\label{wxdccrosshair} \func{void}{CrossHair}{\param{wxCoord}{ x}, \param{wxCoord}{ y}} @@ -336,6 +323,24 @@ Draw an icon on the display (does nothing if the device context is PostScript). This can be the simplest way of drawing bitmaps on a window. +\membersection{wxDC::DrawLabel}\label{wxdcdrawlabel} + +\func{virtual void}{DrawLabel}{\param{const wxString\&}{ text}, + \param{const wxBitmap\&}{ image}, + \param{const wxRect\&}{ rect}, + \param{int}{ alignment = wxALIGN\_LEFT | wxALIGN\_TOP}, + \param{int}{ indexAccel = -1}, + \param{wxRect *}{rectBounding = NULL}} + +\func{void}{DrawLabel}{\param{const wxString\&}{ text}, \param{const wxRect\&}{ rect}, + \param{int}{ alignment = wxALIGN\_LEFT | wxALIGN\_TOP}, + \param{int}{ indexAccel = -1}} + +Draw optional bitmap and the text into the given rectangle and aligns it as specified +by alignment parameter; it also will emphasize the character with the given index if +it is != -1 and return the bounding rectangle if required. + + \membersection{wxDC::DrawLine}\label{wxdcdrawline} \func{void}{DrawLine}{\param{wxCoord}{ x1}, \param{wxCoord}{ y1}, \param{wxCoord}{ x2}, \param{wxCoord}{ y2}} @@ -429,7 +434,7 @@ The polygons maybe disjoint or overlapping. Each polygon specified in a call to \func{void}{DrawPoint}{\param{wxCoord}{ x}, \param{wxCoord}{ y}} -Draws a point using the current pen. +Draws a point using the color of the current pen. Note that the other properties of the pen are not used, such as width etc.. \membersection{wxDC::DrawRectangle}\label{wxdcdrawrectangle} @@ -459,7 +464,7 @@ which is. \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 @@ -477,12 +482,15 @@ the rectangle. \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 -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}} @@ -538,15 +546,6 @@ wxUSE\_DC\_CACHEING preprocessor symbol for portability. 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} @@ -575,8 +574,6 @@ function will still return true. \membersection{wxDC::GetBackground}\label{wxdcgetbackground} -\func{wxBrush\&}{GetBackground}{\void} - \constfunc{const wxBrush\&}{GetBackground}{\void} Gets the brush used for painting the background (see \helpref{wxDC::SetBackground}{wxdcsetbackground}). @@ -595,8 +592,6 @@ Returns the current background mode: {\tt wxSOLID} or {\tt wxTRANSPARENT}. \membersection{wxDC::GetBrush}\label{wxdcgetbrush} -\func{wxBrush\&}{GetBrush}{\void} - \constfunc{const wxBrush\&}{GetBrush}{\void} Gets the current brush (see \helpref{wxDC::SetBrush}{wxdcsetbrush}). @@ -631,11 +626,26 @@ rectangle are returned as a tuple.} \membersection{wxDC::GetFont}\label{wxdcgetfont} -\func{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::GetLayoutDirection}\label{wxdcgetlayoutdirection} + +\constfunc{wxLayoutDirection}{GetLayoutDirection}{\void} + +Gets the current layout direction of the device context. On platforms where RTL layout +is supported, the return value will either be \texttt{wxLayout\_LeftToRight} or +\texttt{wxLayout\_RightToLeft}. If RTL layout is not supported, the return value will +be \texttt{wxLayout\_Default}. + +\wxheading{See also} + +\helpref{SetLayoutDirection}{wxdcsetlayoutdirection} \membersection{wxDC::GetLogicalFunction}\label{wxdcgetlogicalfunction} @@ -652,45 +662,39 @@ Gets the current logical function (see \helpref{wxDC::SetLogicalFunction}{wxdcse Gets the {\it mapping mode} for the device context (see \helpref{wxDC::SetMapMode}{wxdcsetmapmode}). -\membersection{wxDC::GetOptimization}\label{wxdcgetoptimization} - -\func{bool}{GetOptimization}{\void} - -Returns true if device context optimization is on. -See \helpref{wxDC::SetOptimization}{wxsetoptimization} for details. - - \membersection{wxDC::GetPartialTextExtents}\label{wxdcgetpartialtextextents} \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 -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 returns a Python list of integers.} -\membersection{wxDC::GetPen}\label{wxdcgetpen} -\func{wxPen\&}{GetPen}{\void} +\membersection{wxDC::GetPen}\label{wxdcgetpen} \constfunc{const wxPen\&}{GetPen}{\void} Gets the current pen (see \helpref{wxDC::SetPen}{wxdcsetpen}). + \membersection{wxDC::GetPixel}\label{wxdcgetpixel} \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. +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.} @@ -749,8 +753,6 @@ Returns the horizontal and vertical resolution in millimetres. \membersection{wxDC::GetTextBackground}\label{wxdcgettextbackground} -\func{wxColour\&}{GetTextBackground}{\void} - \constfunc{const wxColour\&}{GetTextBackground}{\void} Gets the current text background colour (see \helpref{wxDC::SetTextBackground}{wxdcsettextbackground}). @@ -768,10 +770,8 @@ 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). -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}. @@ -791,14 +791,11 @@ See also \helpref{wxFont}{wxfont}, \helpref{wxDC::SetFont}{wxdcsetfont}. \membersection{wxDC::GetTextForeground}\label{wxdcgettextforeground} -\func{wxColour\&}{GetTextForeground}{\void} - \constfunc{const wxColour\&}{GetTextForeground}{\void} Gets the current text foreground colour (see \helpref{wxDC::SetTextForeground}{wxdcsettextforeground}). - \membersection{wxDC::GetUserScale}\label{wxdcgetuserscale} \func{void}{GetUserScale}{\param{double}{ *x}, \param{double}{ *y}} @@ -809,6 +806,35 @@ Gets the current user scale factor (set by \helpref{SetUserScale}{wxdcsetusersca 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}} @@ -871,7 +897,7 @@ Gets the minimum horizontal extent used in drawing commands so far. Gets the minimum vertical extent used in drawing commands so far. -\membersection{wxDC::Ok}\label{wxdcok} +\membersection{wxDC::IsOk}\label{wxdcisok} \func{bool}{Ok}{\void} @@ -896,8 +922,8 @@ doesn't contain anything. \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} @@ -908,17 +934,6 @@ left to right orientation, false to invert it.} bottom up orientation, false to invert it.} -\membersection{wxDC::SetDeviceOrigin}\label{wxdcsetdeviceorigin} - -\func{void}{SetDeviceOrigin}{\param{wxCoord}{ x}, \param{wxCoord}{ y}} - -Sets the device origin (i.e., the origin in pixels after scaling has been -applied). - -This function may be useful in Windows printing -operations for placing a graphic on a page. - - \membersection{wxDC::SetBackground}\label{wxdcsetbackground} \func{void}{SetBackground}{\param{const wxBrush\& }{brush}} @@ -934,6 +949,22 @@ Sets the current background brush for the DC. whether text will be drawn with a background colour or not. +\membersection{wxDC::SetBrush}\label{wxdcsetbrush} + +\func{void}{SetBrush}{\param{const wxBrush\& }{brush}} + +Sets the current brush for the DC. + +If the argument is wxNullBrush, the current brush is selected out of the device +context, and the original brush restored, allowing the current brush to +be destroyed safely. + +See also \helpref{wxBrush}{wxbrush}. + +See also \helpref{wxMemoryDC}{wxmemorydc} for the interpretation of colours +when drawing into a monochrome bitmap. + + \membersection{wxDC::SetClippingRegion}\label{wxdcsetclippingregion} \func{void}{SetClippingRegion}{\param{wxCoord}{ x}, \param{wxCoord}{ y}, \param{wxCoord}{ width}, \param{wxCoord}{ height}} @@ -959,42 +990,37 @@ when only a known area of the screen is damaged. \helpref{wxDC::DestroyClippingRegion}{wxdcdestroyclippingregion}, \helpref{wxRegion}{wxregion} -\membersection{wxDC::SetPalette}\label{wxdcsetpalette} +\membersection{wxDC::SetDeviceOrigin}\label{wxdcsetdeviceorigin} -\func{void}{SetPalette}{\param{const wxPalette\& }{palette}} +\func{void}{SetDeviceOrigin}{\param{wxCoord}{ x}, \param{wxCoord}{ y}} -If this is a window DC or memory DC, assigns the given palette to the window -or bitmap associated with the DC. If the argument is wxNullPalette, the current -palette is selected out of the device context, and the original palette -restored. +Sets the device origin (i.e., the origin in pixels after scaling has been +applied). -See \helpref{wxPalette}{wxpalette} for further details. +This function may be useful in Windows printing +operations for placing a graphic on a page. -\membersection{wxDC::SetBrush}\label{wxdcsetbrush} +\membersection{wxDC::SetFont}\label{wxdcsetfont} -\func{void}{SetBrush}{\param{const wxBrush\& }{brush}} +\func{void}{SetFont}{\param{const wxFont\& }{font}} -Sets the current brush for the DC. +Sets the current font for the DC. It must be a valid font, in particular you +should not pass {\tt wxNullFont} to this method. -If the argument is wxNullBrush, the current brush is selected out of the device -context, and the original brush restored, allowing the current brush to -be destroyed safely. +See also \helpref{wxFont}{wxfont}. -See also \helpref{wxBrush}{wxbrush}. -See also \helpref{wxMemoryDC}{wxmemorydc} for the interpretation of colours -when drawing into a monochrome bitmap. +\membersection{wxDC::SetLayoutDirection}\label{wxdcsetlayoutdirection} +\func{void}{SetLayoutDirection}{\param{wxLayoutDirection}{ dir}} -\membersection{wxDC::SetFont}\label{wxdcsetfont} +Sets the current layout direction for the device context. \arg{dir} may be either +\texttt{wxLayout\_Default}, \texttt{wxLayout\_LeftToRight} or \texttt{wxLayout\_RightToLeft}. -\func{void}{SetFont}{\param{const wxFont\& }{font}} - -Sets the current font for the DC. It must be a valid font, in particular you -should not pass {\tt wxNullFont} to this method. +\wxheading{See also} -See also \helpref{wxFont}{wxfont}. +\helpref{GetLayoutDirection}{wxdcgetlayoutdirection} \membersection{wxDC::SetLogicalFunction}\label{wxdcsetlogicalfunction} @@ -1064,19 +1090,16 @@ The mapping mode can be one of the following: \end{twocollist} -\membersection{wxDC::SetOptimization}\label{wxsetoptimization} +\membersection{wxDC::SetPalette}\label{wxdcsetpalette} -\func{void}{SetOptimization}{\param{bool }{optimize}} +\func{void}{SetPalette}{\param{const wxPalette\& }{palette}} -If {\it optimize} is true (the default), this function sets optimization mode on. -This currently means that under X, the device context will not try to set a pen or brush -property if it is known to be set already. This approach can fall down -if non-wxWidgets code is using the same device context or window, for example -when the window is a panel on which the windowing system draws panel items. -The wxWidgets device context 'memory' will now be out of step with reality. +If this is a window DC or memory DC, assigns the given palette to the window +or bitmap associated with the DC. If the argument is wxNullPalette, the current +palette is selected out of the device context, and the original palette +restored. -Setting optimization off, drawing, then setting it back on again, is a trick -that must occasionally be employed. +See \helpref{wxPalette}{wxpalette} for further details. \membersection{wxDC::SetPen}\label{wxdcsetpen} @@ -1122,7 +1145,7 @@ 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). -Message is a message to show whilst printing. +Message is a message to show while printing. \membersection{wxDC::StartPage}\label{wxdcstartpage} @@ -1131,40 +1154,3 @@ Message is a message to show whilst printing. 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 to its constructor -clipping region and then automatically destroys it in its destructor. Using -it ensures that unwanted clipping region is not left set on the DC. - -\wxheading{Derived from} - -No base class - -\wxheading{Include files} - - - -\wxheading{See also} - -\helpref{wxDC}{wxdc} - -\latexignore{\rtfignore{\wxheading{Members}}} - - -\membersection{wxDCClipper::wxDCClipper} - -\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}} - -\func{}{\destruct{wxDCClipper}}{\void} - -Destructor: destroys the clipping region set in the constructor. -