X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/2edb0bdef6238c8c246b6978bc14828b7033d931..43e995b6e39d41fd8a26f8bb9e6a6ef54bbcd324:/docs/latex/wx/dc.tex?ds=sidebyside diff --git a/docs/latex/wx/dc.tex b/docs/latex/wx/dc.tex index f2f55be06f..e0f3256f49 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} @@ -30,38 +38,12 @@ 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}, \param{wxDC* }{source}, \param{wxCoord}{ xsrc}, \param{wxCoord}{ ysrc}, \param{int}{ logicalFunc = wxCOPY}, - \param{bool }{useMask = FALSE}, \param{wxCoord}{ xsrcMask = -1}, \param{wxCoord}{ ysrcMask = -1}} + \param{bool }{useMask = false}, \param{wxCoord}{ xsrcMask = -1}, \param{wxCoord}{ ysrcMask = -1}} Copy from a source DC to this DC, specifying the destination coordinates, size of area to copy, source DC, source coordinates, @@ -85,7 +67,7 @@ logical function, whether to use a bitmap mask, and mask source position. \docparam{logicalFunc}{Logical function to use: see \helpref{wxDC::SetLogicalFunction}{wxdcsetlogicalfunction}.} -\docparam{useMask}{If TRUE, Blit does a transparent blit using the mask that is associated with the bitmap +\docparam{useMask}{If true, Blit does a transparent blit using the mask that is associated with the bitmap selected into the source device context. The Windows implementation does the following if MaskBlt cannot be used: \begin{enumerate} @@ -105,7 +87,7 @@ This sequence of operations ensures that the source's transparent area need not and logical functions are supported. {\bf Note:} on Windows, blitting with masks can be speeded up considerably by compiling -wxWindows with the wxUSE\_DC\_CACHE option enabled. You can also influence whether MaskBlt +wxWidgets with the wxUSE\_DC\_CACHE option enabled. You can also influence whether MaskBlt or the explicit mask blitting code above is used, by using \helpref{wxSystemOptions}{wxsystemoptions} and setting the {\bf no-maskblt} option to 1. @@ -129,11 +111,12 @@ See \helpref{wxMemoryDC}{wxmemorydc} for typical usage. \helpref{wxMemoryDC}{wxmemorydc}, \helpref{wxBitmap}{wxbitmap}, \helpref{wxMask}{wxmask} \begin{comment} + \membersection{wxDC::CacheEnabled}\label{wxdccacheenabled} \func{static bool}{CacheEnabled}{\void} -On supported platforms (currently only Windows), returns TRUE +On supported platforms (currently only Windows), returns true if the DC cache is enabled. The DC cache can speed up the \helpref{Blit}{wxdcblit} operation when drawing a large number of masked bitmaps. @@ -146,6 +129,7 @@ wxUSE\_DC\_CACHEING preprocessor symbol for portability. \helpref{wxDC::EnableCache}{wxdcenablecache}, \helpref{wxDC::ClearCache} \end{comment} + \membersection{wxDC::CalcBoundingBox}\label{wxdccalcboundingbox} \func{void}{CalcBoundingBox}{\param{wxCoord }{x}, \param{wxCoord }{y}} @@ -158,6 +142,7 @@ Adds the specified point to the bounding box which can be retrieved with \helpref{ResetBoundingBox}{wxdcresetboundingbox} + \membersection{wxDC::Clear}\label{wxdcclear} \func{void}{Clear}{\void} @@ -165,6 +150,7 @@ Adds the specified point to the bounding box which can be retrieved with Clears the device context using the current background brush. \begin{comment} + \membersection{wxDC::ClearCache}\label{wxdcclearcache} \func{static void}{ClearCache}{\void} @@ -184,6 +170,16 @@ wxUSE\_DC\_CACHEING preprocessor symbol for portability. \helpref{wxDC::EnableCache}{wxdcenablecache}, \helpref{wxDC::CacheEnabled} \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}} @@ -192,6 +188,7 @@ Displays a cross hair using the current pen. This is a vertical and horizontal line the height and width of the window, centred on the given point. + \membersection{wxDC::DestroyClippingRegion}\label{wxdcdestroyclippingregion} \func{void}{DestroyClippingRegion}{\void} @@ -199,6 +196,7 @@ on the given point. Destroys the current clipping region so that none of the DC is clipped. See also \helpref{wxDC::SetClippingRegion}{wxdcsetclippingregion}. + \membersection{wxDC::DeviceToLogicalX}\label{wxdcdevicetologicalx} \func{wxCoord}{DeviceToLogicalX}{\param{wxCoord}{ x}} @@ -206,6 +204,7 @@ See also \helpref{wxDC::SetClippingRegion}{wxdcsetclippingregion}. Convert device X coordinate to logical coordinate, using the current mapping mode. + \membersection{wxDC::DeviceToLogicalXRel}\label{wxdcdevicetologicalxrel} \func{wxCoord}{DeviceToLogicalXRel}{\param{wxCoord}{ x}} @@ -214,6 +213,7 @@ Convert device X coordinate to relative logical coordinate, using the current mapping mode but ignoring the x axis orientation. Use this function for converting a width, for example. + \membersection{wxDC::DeviceToLogicalY}\label{wxdcdevicetologicaly} \func{wxCoord}{DeviceToLogicalY}{\param{wxCoord}{ y}} @@ -221,6 +221,7 @@ Use this function for converting a width, for example. Converts device Y coordinate to logical coordinate, using the current mapping mode. + \membersection{wxDC::DeviceToLogicalYRel}\label{wxdcdevicetologicalyrel} \func{wxCoord}{DeviceToLogicalYRel}{\param{wxCoord}{ y}} @@ -229,9 +230,10 @@ Convert device Y coordinate to relative logical coordinate, using the current mapping mode but ignoring the y axis orientation. Use this function for converting a height, for example. + \membersection{wxDC::DrawArc}\label{wxdcdrawarc} -\func{void}{DrawArc}{\param{wxCoord}{ x1}, \param{wxCoord}{ y1}, \param{wxCoord}{ x2}, \param{wxCoord}{ y2}, \param{double}{ xc}, \param{double}{ yc}} +\func{void}{DrawArc}{\param{wxCoord}{ x1}, \param{wxCoord}{ y1}, \param{wxCoord}{ x2}, \param{wxCoord}{ y2}, \param{wxCoord}{ xc}, \param{wxCoord}{ yc}} Draws an arc of a circle, centred on ({\it xc, yc}), with starting point ({\it x1, y1}) and ending at ({\it x2, y2}). The current pen is used for the outline @@ -239,11 +241,12 @@ and the current brush for filling the shape. The arc is drawn in an anticlockwise direction from the start point to the end point. + \membersection{wxDC::DrawBitmap}\label{wxdcdrawbitmap} \func{void}{DrawBitmap}{\param{const wxBitmap\&}{ bitmap}, \param{wxCoord}{ x}, \param{wxCoord}{ y}, \param{bool}{ transparent}} -Draw a bitmap on the device context at the specified point. If {\it transparent} is TRUE and the bitmap has +Draw a bitmap on the device context at the specified point. If {\it transparent} is true and the bitmap has a transparency mask, the bitmap will be drawn transparently. When drawing a mono-bitmap, the current text foreground colour will be used to draw the foreground @@ -251,6 +254,7 @@ of the bitmap (all bits set to 1), and the current text background colour to dra (all bits set to 0). See also \helpref{SetTextForeground}{wxdcsettextforeground}, \helpref{SetTextBackground}{wxdcsettextbackground} and \helpref{wxMemoryDC}{wxmemorydc}. + \membersection{wxDC::DrawCheckMark}\label{wxdcdrawcheckmark} \func{void}{DrawCheckMark}{\param{wxCoord}{ x}, \param{wxCoord}{ y}, \param{wxCoord}{ width}, \param{wxCoord}{ height}} @@ -259,6 +263,7 @@ of the bitmap (all bits set to 1), and the current text background colour to dra Draws a check mark inside the given rectangle. + \membersection{wxDC::DrawCircle}\label{wxdcdrawcircle} \func{void}{DrawCircle}{\param{wxCoord}{ x}, \param{wxCoord}{ y}, \param{wxCoord}{ radius}} @@ -271,6 +276,7 @@ Draws a circle with the given centre and radius. \helpref{DrawEllipse}{wxdcdrawellipse} + \membersection{wxDC::DrawEllipse}\label{wxdcdrawellipse} \func{void}{DrawEllipse}{\param{wxCoord}{ x}, \param{wxCoord}{ y}, \param{wxCoord}{ width}, \param{wxCoord}{ height}} @@ -287,6 +293,7 @@ outline and the current brush for filling the shape. \helpref{DrawCircle}{wxdcdrawcircle} + \membersection{wxDC::DrawEllipticArc}\label{wxdcdrawellipticarc} \func{void}{DrawEllipticArc}{\param{wxCoord}{ x}, \param{wxCoord}{ y}, \param{wxCoord}{ width}, \param{wxCoord}{ height}, @@ -307,6 +314,7 @@ in degrees (360 is a complete circle). Positive values mean counter-clockwise motion. If {\it start} is equal to {\it end}, a complete ellipse will be drawn. + \membersection{wxDC::DrawIcon}\label{wxdcdrawicon} \func{void}{DrawIcon}{\param{const wxIcon\&}{ icon}, \param{wxCoord}{ x}, \param{wxCoord}{ y}} @@ -314,12 +322,34 @@ complete ellipse will be drawn. 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}} Draws a line from the first point to the second. The current pen is used -for drawing the line. +for drawing the line. Note that the point $(x2, y2)$ is {\emph not} part of the +line and is not drawn by this function (this is consistent with the behaviour +of many other toolkits). + \membersection{wxDC::DrawLines}\label{wxdcdrawlines} @@ -339,6 +369,7 @@ of wxPoint objects.} as its first parameter a reference to an array of wxPoint objects.} + \membersection{wxDC::DrawPolygon}\label{wxdcdrawpolygon} \func{void}{DrawPolygon}{\param{int}{ n}, \param{wxPoint}{ points[]}, \param{wxCoord}{ xoffset = 0}, \param{wxCoord}{ yoffset = 0},\\ @@ -357,7 +388,7 @@ The current pen is used for drawing the outline, and the current brush for filling the shape. Using a transparent brush suppresses filling. The programmer is responsible for deleting the list of points. -Note that wxWindows automatically closes the first and last points. +Note that wxWidgets automatically closes the first and last points. \pythonnote{The wxPython version of this method accepts a Python list of wxPoint objects.} @@ -366,11 +397,45 @@ of wxPoint objects.} as its first parameter a reference to an array of wxPoint objects.} + +\membersection{wxDC::DrawPolyPolygon}\label{wxdcdrawpolypolygon} + +\func{void}{DrawPolyPolygon}{\param{int}{ n}, \param{int}{ count[]}, \param{wxPoint}{ points[]}, \param{wxCoord}{ xoffset = 0}, \param{wxCoord}{ yoffset = 0},\\ + \param{int }{fill\_style = wxODDEVEN\_RULE}} + +Draws two or more filled polygons using an array of {\it points}, adding the +optional offset coordinates. + +Notice that for the platforms providing a native implementation +of this function (Windows and PostScript-based wxDC currently), this is more +efficient than using \helpref{DrawPolygon}{wxdcdrawpolygon} in a loop. + +{\it n} specifies the number of polygons to draw, the array {\it count} of size +{\it n} specifies the number of points in each of the polygons in the +{\it points} array. + +The last argument specifies the fill rule: {\bf wxODDEVEN\_RULE} (the default) +or {\bf wxWINDING\_RULE}. + +The current pen is used for drawing the outline, and the current brush for +filling the shape. Using a transparent brush suppresses filling. + +The polygons maybe disjoint or overlapping. Each polygon specified in a call to +{\bf DrawPolyPolygon} must be closed. Unlike polygons created by the +\helpref{DrawPolygon}{wxdcdrawpolygon} member function, the polygons created by +{\bf DrawPolyPolygon} are not closed automatically. + +\pythonnote{Not implemented yet} + +\perlnote{Not implemented yet} + + \membersection{wxDC::DrawPoint}\label{wxdcdrawpoint} \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} @@ -380,6 +445,7 @@ Draws a rectangle with the given top left corner, and with the given size. The current pen is used for the outline and the current brush for filling the shape. + \membersection{wxDC::DrawRotatedText}\label{wxdcdrawrotatedtext} \func{void}{DrawRotatedText}{\param{const wxString\& }{text}, \param{wxCoord}{ x}, \param{wxCoord}{ y}, \param{double}{ angle}} @@ -395,9 +461,10 @@ which is. \helpref{DrawText}{wxdcdrawtext} + \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 @@ -412,14 +479,18 @@ a sensible size relative to the size of the rectangle, and also avoids the strange effects X produces when the corners are too big for 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}} @@ -431,6 +502,7 @@ of wxPoint objects.} \perlnote{The wxPerl version of this method accepts a reference to an array of wxPoint objects.} + \membersection{wxDC::DrawText}\label{wxdcdrawtext} \func{void}{DrawText}{\param{const wxString\& }{text}, \param{wxCoord}{ x}, \param{wxCoord}{ y}} @@ -449,6 +521,7 @@ but it is ignored by wxMSW. Thus, you should avoid using logical functions with this function in portable programs. \begin{comment} + \membersection{wxDC::EnableCache}\label{wxdcenablecache} \func{static void}{EnableCache}{\param{bool}{ enableCache}} @@ -465,19 +538,13 @@ wxUSE\_DC\_CACHEING preprocessor symbol for portability. \helpref{wxDC::CacheEnabled}{wxdccacheenabled}, \helpref{wxDC::ClearCache} \end{comment} + \membersection{wxDC::EndDoc}\label{wxdcenddoc} \func{void}{EndDoc}{\void} 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} @@ -485,6 +552,7 @@ calls. Ends a document page (only relevant when outputting to a printer). + \membersection{wxDC::FloodFill}\label{wxdcfloodfill} \func{bool}{FloodFill}{\param{wxCoord}{ x}, \param{wxCoord}{ y}, \param{const wxColour\&}{ colour}, \param{int}{ style=wxFLOOD\_SURFACE}} @@ -497,20 +565,20 @@ the {\it current brush colour}, and using a style: \item wxFLOOD\_BORDER: the area to be flooded is bounded by the given colour. \end{itemize} -Returns FALSE if the operation failed. +Returns false if the operation failed. {\it Note:} The present implementation for non-Windows platforms may fail to find colour borders if the pixels do not match the colour exactly. However the -function will still return TRUE. +function will still return true. -\membersection{wxDC::GetBackground}\label{wxdcgetbackground} -\func{wxBrush\&}{GetBackground}{\void} +\membersection{wxDC::GetBackground}\label{wxdcgetbackground} \constfunc{const wxBrush\&}{GetBackground}{\void} Gets the brush used for painting the background (see \helpref{wxDC::SetBackground}{wxdcsetbackground}). + \membersection{wxDC::GetBackgroundMode}\label{wxdcgetbackgroundmode} \constfunc{int}{GetBackgroundMode}{\void} @@ -521,26 +589,28 @@ Returns the current background mode: {\tt wxSOLID} or {\tt wxTRANSPARENT}. \helpref{SetBackgroundMode}{wxdcsetbackgroundmode} -\membersection{wxDC::GetBrush}\label{wxdcgetbrush} -\func{wxBrush\&}{GetBrush}{\void} +\membersection{wxDC::GetBrush}\label{wxdcgetbrush} \constfunc{const wxBrush\&}{GetBrush}{\void} Gets the current brush (see \helpref{wxDC::SetBrush}{wxdcsetbrush}). + \membersection{wxDC::GetCharHeight}\label{wxdcgetcharheight} \func{wxCoord}{GetCharHeight}{\void} Gets the character height of the currently set font. + \membersection{wxDC::GetCharWidth}\label{wxdcgetcharwidth} \func{wxCoord}{GetCharWidth}{\void} Gets the average character width of the currently set font. + \membersection{wxDC::GetClippingBox}\label{wxdcgetclippingbox} \func{void}{GetClippingBox}{\param{wxCoord}{ *x}, \param{wxCoord}{ *y}, \param{wxCoord}{ *width}, \param{wxCoord}{ *height}} @@ -553,13 +623,16 @@ rectangle are returned as a tuple.} \perlnote{This method takes no arguments and returns a four element list {\tt ( x, y, width, height )}} -\membersection{wxDC::GetFont}\label{wxdcgetfont} -\func{wxFont\&}{GetFont}{\void} +\membersection{wxDC::GetFont}\label{wxdcgetfont} \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} @@ -567,33 +640,46 @@ Gets the current font (see \helpref{wxDC::SetFont}{wxdcsetfont}). Gets the current logical function (see \helpref{wxDC::SetLogicalFunction}{wxdcsetlogicalfunction}). + \membersection{wxDC::GetMapMode}\label{wxdcgetmapmode} \func{int}{GetMapMode}{\void} Gets the {\it mapping mode} for the device context (see \helpref{wxDC::SetMapMode}{wxdcsetmapmode}). -\membersection{wxDC::GetOptimization}\label{wxdcgetoptimization} -\func{bool}{GetOptimization}{\void} +\membersection{wxDC::GetPartialTextExtents}\label{wxdcgetpartialtextextents} -Returns TRUE if device context optimization is on. -See \helpref{wxDC::SetOptimization}{wxsetoptimization} for details. +\constfunc{bool}{GetPartialTextExtents}{\param{const wxString\& }{text}, +\param{wxArrayInt\& }{widths}} -\membersection{wxDC::GetPen}\label{wxdcgetpen} +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 implementation then it should be used +instead. + +\pythonnote{This method only takes the {\it text} parameter and + returns a Python list of integers.} -\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. Windows only; an X implementation -is being worked on. Not available for wxPostScriptDC or wxMetafileDC. +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.} @@ -601,16 +687,20 @@ required as a parameter.} \perlnote{This method only takes the parameters {\tt x} and {\tt y} and returns a Wx::Colour value} +\membersection{wxDC::GetPPI}\label{wxdcgetppi} + +\constfunc{wxSize}{GetPPI}{\void} + +Returns the resolution of the device in pixels per inch. + \membersection{wxDC::GetSize}\label{wxdcgetsize} -\func{void}{GetSize}{\param{wxCoord *}{width}, \param{wxCoord *}{height}} +\constfunc{void}{GetSize}{\param{wxCoord *}{width}, \param{wxCoord *}{height}} -For a PostScript device context, this gets the maximum size of graphics -drawn so far on the device context. +\constfunc{wxSize}{GetSize}{\void} -For a Windows printer device context, this gets the horizontal and vertical -resolution. It can be used to scale graphics to fit the page when using -a Windows printer device context. For example, if {\it maxX} and {\it maxY}\rtfsp +This gets the horizontal and vertical resolution in device units. It can be used to scale graphics to fit the page. +For example, if {\it maxX} and {\it maxY}\rtfsp represent the maximum horizontal and vertical `pixel' values used in your application, the following code will scale the graphic to fit on the printer page: @@ -639,14 +729,21 @@ implements the following methods:\par \end{twocollist} }} -\membersection{wxDC::GetTextBackground}\label{wxdcgettextbackground} +\membersection{wxDC::GetSizeMM}\label{wxdcgetsizemm} -\func{wxColour\&}{GetTextBackground}{\void} +\constfunc{void}{GetSizeMM}{\param{wxCoord *}{width}, \param{wxCoord *}{height}} + +\constfunc{wxSize}{GetSizeMM}{\void} + +Returns the horizontal and vertical resolution in millimetres. + +\membersection{wxDC::GetTextBackground}\label{wxdcgettextbackground} \constfunc{const wxColour\&}{GetTextBackground}{\void} Gets the current text background colour (see \helpref{wxDC::SetTextBackground}{wxdcsettextbackground}). + \membersection{wxDC::GetTextExtent}\label{wxdcgettextextent} \func{void}{GetTextExtent}{\param{const wxString\& }{string}, \param{wxCoord *}{w}, \param{wxCoord *}{h},\\ @@ -659,10 +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). -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}. @@ -679,9 +774,8 @@ See also \helpref{wxFont}{wxfont}, \helpref{wxDC::SetFont}{wxdcsetfont}. array {\tt ( width, height, descent, externalLeading )} } -\membersection{wxDC::GetTextForeground}\label{wxdcgettextforeground} -\func{wxColour\&}{GetTextForeground}{\void} +\membersection{wxDC::GetTextForeground}\label{wxdcgettextforeground} \constfunc{const wxColour\&}{GetTextForeground}{\void} @@ -697,6 +791,36 @@ Gets the current user scale factor (set by \helpref{SetUserScale}{wxdcsetusersca \perlnote{In wxPerl this method takes no arguments and return a two element 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}} @@ -704,6 +828,7 @@ Gets the current user scale factor (set by \helpref{SetUserScale}{wxdcsetusersca Converts logical X coordinate to device coordinate, using the current mapping mode. + \membersection{wxDC::LogicalToDeviceXRel}\label{wxdclogicaltodevicexrel} \func{wxCoord}{LogicalToDeviceXRel}{\param{wxCoord}{ x}} @@ -712,6 +837,7 @@ Converts logical X coordinate to relative device coordinate, using the current mapping mode but ignoring the x axis orientation. Use this for converting a width, for example. + \membersection{wxDC::LogicalToDeviceY}\label{wxdclogicaltodevicey} \func{wxCoord}{LogicalToDeviceY}{\param{wxCoord}{ y}} @@ -719,6 +845,7 @@ Use this for converting a width, for example. Converts logical Y coordinate to device coordinate, using the current mapping mode. + \membersection{wxDC::LogicalToDeviceYRel}\label{wxdclogicaltodeviceyrel} \func{wxCoord}{LogicalToDeviceYRel}{\param{wxCoord}{ y}} @@ -727,35 +854,41 @@ Converts logical Y coordinate to relative device coordinate, using the current mapping mode but ignoring the y axis orientation. Use this for converting a height, for example. + \membersection{wxDC::MaxX}\label{wxdcmaxx} \func{wxCoord}{MaxX}{\void} Gets the maximum horizontal extent used in drawing commands so far. + \membersection{wxDC::MaxY}\label{wxdcmaxy} \func{wxCoord}{MaxY}{\void} Gets the maximum vertical extent used in drawing commands so far. + \membersection{wxDC::MinX}\label{wxdcminx} \func{wxCoord}{MinX}{\void} Gets the minimum horizontal extent used in drawing commands so far. + \membersection{wxDC::MinY}\label{wxdcminy} \func{wxCoord}{MinY}{\void} Gets the minimum vertical extent used in drawing commands so far. + \membersection{wxDC::Ok}\label{wxdcok} \func{bool}{Ok}{\void} -Returns TRUE if the DC is ok to use. +Returns true if the DC is ok to use. + \membersection{wxDC::ResetBoundingBox}\label{wxdcresetboundingbox} @@ -768,14 +901,15 @@ doesn't contain anything. \helpref{CalcBoundingBox}{wxdccalcboundingbox} + \membersection{wxDC::SetAxisOrientation}\label{wxdcsetaxisorientation} \func{void}{SetAxisOrientation}{\param{bool}{ xLeftRight}, \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} @@ -785,15 +919,6 @@ left to right orientation, false to invert it.} \docparam{yBottomUp}{True to set the y axis orientation to the natural 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} @@ -801,6 +926,7 @@ operations for placing a graphic on a page. Sets the current background brush for the DC. + \membersection{wxDC::SetBackgroundMode}\label{wxdcsetbackgroundmode} \func{void}{SetBackgroundMode}{\param{int}{ mode}} @@ -808,6 +934,23 @@ Sets the current background brush for the DC. {\it mode} may be one of wxSOLID and wxTRANSPARENT. This setting determines 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}} @@ -832,31 +975,17 @@ when only a known area of the screen is damaged. \helpref{wxDC::DestroyClippingRegion}{wxdcdestroyclippingregion}, \helpref{wxRegion}{wxregion} -\membersection{wxDC::SetPalette}\label{wxdcsetpalette} - -\func{void}{SetPalette}{\param{const wxPalette\& }{palette}} - -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. - -See \helpref{wxPalette}{wxpalette} for further details. - -\membersection{wxDC::SetBrush}\label{wxdcsetbrush} -\func{void}{SetBrush}{\param{const wxBrush\& }{brush}} +\membersection{wxDC::SetDeviceOrigin}\label{wxdcsetdeviceorigin} -Sets the current brush for the DC. +\func{void}{SetDeviceOrigin}{\param{wxCoord}{ x}, \param{wxCoord}{ y}} -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. +Sets the device origin (i.e., the origin in pixels after scaling has been +applied). -See also \helpref{wxBrush}{wxbrush}. +This function may be useful in Windows printing +operations for placing a graphic on a page. -See also \helpref{wxMemoryDC}{wxmemorydc} for the interpretation of colours -when drawing into a monochrome bitmap. \membersection{wxDC::SetFont}\label{wxdcsetfont} @@ -867,6 +996,7 @@ should not pass {\tt wxNullFont} to this method. See also \helpref{wxFont}{wxfont}. + \membersection{wxDC::SetLogicalFunction}\label{wxdcsetlogicalfunction} \func{void}{SetLogicalFunction}{\param{int}{ function}} @@ -904,6 +1034,7 @@ The others combine the current colour and the background using a logical operation. wxINVERT is commonly used for drawing rubber bands or moving outlines, since drawing twice reverts to the original colour. + \membersection{wxDC::SetMapMode}\label{wxdcsetmapmode} \func{void}{SetMapMode}{\param{int}{ int}} @@ -916,12 +1047,10 @@ user scale} (see \helpref{wxDC::SetUserScale}{wxdcsetuserscale}) scales the text Windows, scalable TrueType fonts are always used; in X, results depend on availability of fonts, but usually a reasonable match is found. -Note that the coordinate origin should ideally be selectable, but for -now is always at the top left of the screen/printer. +The coordinate origin is always at the top left of the screen/printer. -Drawing to a Windows printer device context under UNIX -uses the current mapping mode, but mapping mode is currently ignored for -PostScript output. +Drawing to a Windows printer device context uses the current mapping mode, +but mapping mode is currently ignored for PostScript output. The mapping mode can be one of the following: @@ -934,19 +1063,18 @@ The mapping mode can be one of the following: \twocolitem{wxMM\_TEXT}{Each logical unit is 1 pixel.} \end{twocollist} -\membersection{wxDC::SetOptimization}\label{wxsetoptimization} -\func{void}{SetOptimization}{\param{bool }{optimize}} +\membersection{wxDC::SetPalette}\label{wxdcsetpalette} -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-wxWindows 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 wxWindows device context 'memory' will now be out of step with reality. +\func{void}{SetPalette}{\param{const wxPalette\& }{palette}} + +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. + +See \helpref{wxPalette}{wxpalette} for further details. -Setting optimization off, drawing, then setting it back on again, is a trick -that must occasionally be employed. \membersection{wxDC::SetPen}\label{wxdcsetpen} @@ -960,12 +1088,14 @@ context, and the original pen restored. See also \helpref{wxMemoryDC}{wxmemorydc} for the interpretation of colours when drawing into a monochrome bitmap. + \membersection{wxDC::SetTextBackground}\label{wxdcsettextbackground} \func{void}{SetTextBackground}{\param{const wxColour\& }{colour}} Sets the current text background colour for the DC. + \membersection{wxDC::SetTextForeground}\label{wxdcsettextforeground} \func{void}{SetTextForeground}{\param{const wxColour\& }{colour}} @@ -975,6 +1105,7 @@ Sets the current text foreground colour for the DC. See also \helpref{wxMemoryDC}{wxmemorydc} for the interpretation of colours when drawing into a monochrome bitmap. + \membersection{wxDC::SetUserScale}\label{wxdcsetuserscale} \func{void}{SetUserScale}{\param{double}{ xScale}, \param{double}{ yScale}} @@ -982,51 +1113,17 @@ when drawing into a monochrome bitmap. Sets the user scaling factor, useful for applications which require `zooming'. + \membersection{wxDC::StartDoc}\label{wxdcstartdoc} \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} \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 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. -