X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/ae3c17b4013e80b99976c750c19fca47729517f6..b5fe7ca67bf3121959a0b5a59afd00c1708f2f03:/interface/wx/dc.h
diff --git a/interface/wx/dc.h b/interface/wx/dc.h
index 107cc06058..9184ee8900 100644
--- a/interface/wx/dc.h
+++ b/interface/wx/dc.h
@@ -6,9 +6,83 @@
// Licence: wxWindows license
/////////////////////////////////////////////////////////////////////////////
+
+/**
+ Logical raster operations which can be used with wxDC::SetLogicalFunction
+ and some other wxDC functions (e.g. wxDC::Blit and wxDC::StretchBlit).
+
+ The description of the values below refer to how a generic @e src source pixel
+ and the corresponding @e dst destination pixel gets combined together to produce
+ the final pixel. E.g. @c wxCLEAR and @c wxSET completely ignore the source
+ and the destination pixel and always put zeroes or ones in the final surface.
+*/
+enum wxRasterOperationMode
+{
+ wxCLEAR, //!< 0
+ wxXOR, //!< @e src XOR @e dst
+ wxINVERT, //!< NOT @e dst
+ wxOR_REVERSE, //!< @e src OR (NOT @e dst)
+ wxAND_REVERSE, //!< @e src AND (NOT @e dst)
+ wxCOPY, //!< @e src
+ wxAND, //!< @e src AND @e dst
+ wxAND_INVERT, //!< (NOT @e src) AND @e dst
+ wxNO_OP, //!< @e dst
+ wxNOR, //!< (NOT @e src) AND (NOT @e dst)
+ wxEQUIV, //!< (NOT @e src) XOR @e dst
+ wxSRC_INVERT, //!< (NOT @e src)
+ wxOR_INVERT, //!< (NOT @e src) OR @e dst
+ wxNAND, //!< (NOT @e src) OR (NOT @e dst)
+ wxOR, //!< @e src OR @e dst
+ wxSET //!< 1
+};
+
+/**
+ Flood styles used by wxDC::FloodFill.
+*/
+enum wxFloodFillStyle
+{
+ /** The flooding occurs until a colour other than the given colour is encountered. */
+ wxFLOOD_SURFACE = 1,
+
+ /** The area to be flooded is bounded by the given colour. */
+ wxFLOOD_BORDER
+};
+
+/**
+ The mapping used to transform @e logical units to @e device units.
+ See wxDC::SetMapMode.
+*/
+enum wxMappingMode
+{
+ /**
+ Each logical unit is 1 device pixel.
+ This is the default mapping mode for all wxDC-derived classes.
+ */
+ wxMM_TEXT = 1,
+
+ /** Each logical unit is 1 millimeter. */
+ wxMM_METRIC,
+
+ /** Each logical unit is 1/10 of a millimeter. */
+ wxMM_LOMETRIC,
+
+ /**
+ Each logical unit is 1/20 of a @e "printer point", or 1/1440 of an inch
+ (also known as "twip"). Equivalent to about 17.64 micrometers.
+ */
+ wxMM_TWIPS,
+
+ /**
+ Each logical unit is a @e "printer point" i.e. 1/72 of an inch.
+ Equivalent to about 353 micrometers.
+ */
+ wxMM_POINTS
+};
+
+
+
/**
@class wxDC
- @wxheader{dc.h}
A wxDC is a @e "device context" onto which graphics and text can be drawn.
It is intended to represent different output devices and offers a common
@@ -38,151 +112,113 @@
wxDCImpl class. The user-visible classes such as wxClientDC and
wxPaintDC merely forward all calls to the backend implementation.
- On Mac OS X colours with alpha channel are supported. Instances wxPen
+
+ @section dc_units Device and logical units
+
+ In the wxDC context there is a distinction between @e logical units and @e device units.
+
+ @b Device units are the units native to the particular device; e.g. for a screen,
+ a device unit is a @e pixel. For a printer, the device unit is defined by the
+ resolution of the printer (usually given in @c DPI: dot-per-inch).
+
+ All wxDC functions use instead @b logical units, unless where explicitely
+ stated. Logical units are arbitrary units mapped to device units using
+ the current mapping mode (see wxDC::SetMapMode).
+
+ This mechanism allows to reuse the same code which prints on e.g. a window
+ on the screen to print on e.g. a paper.
+
+
+ @section dc_alpha_support Support for Transparency / Alpha Channel
+
+ On Mac OS X colours with alpha channel are supported. Instances of wxPen
or wxBrush that are built from wxColour use the colour's alpha values
when stroking or filling.
+
@library{wxcore}
@category{dc,gdi}
- @see @ref overview_dc, wxGraphicsContext
+ @see @ref overview_dc, wxGraphicsContext, wxDCFontChanger, wxDCTextColourChanger,
+ wxDCPenChanger, wxDCBrushChanger, wxDCClipper
@todo Precise definition of default/initial state.
@todo Pixelwise definition of operations (e.g. last point of a line not
drawn).
- @todo Coordinates: state clearly which type of coordinates are returned by
- the various Get*Point() or similar functions - often they are client
- coordinates but not always.
*/
class wxDC : public wxObject
{
public:
/**
- Copy from a source DC to this DC, specifying the destination
- coordinates, size of area to copy, source DC, source coordinates,
- logical function, whether to use a bitmap mask, and mask source
- position.
-
- @param xdest
- Destination device context x position.
- @param ydest
- Destination device context y position.
- @param width
- Width of source area to be copied.
- @param height
- Height of source area to be copied.
- @param source
- Source device context.
- @param xsrc
- Source device context x position.
- @param ysrc
- Source device context y position.
- @param logicalFunc
- Logical function to use, see SetLogicalFunction().
- @param 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:
-
- - Creates a temporary bitmap and copies the destination area into
- it.
- - Copies the source area into the temporary bitmap using the
- specified logical function.
- - Sets the masked area in the temporary bitmap to BLACK by ANDing
- the mask bitmap with the temp bitmap with the foreground colour
- set to WHITE and the bg colour set to BLACK.
- - Sets the unmasked area in the destination area to BLACK by
- ANDing the mask bitmap with the destination area with the
- foreground colour set to BLACK and the background colour set to
- WHITE.
- - ORs the temporary bitmap with the destination area.
- - Deletes the temporary bitmap.
-
- This sequence of operations ensures that the source's transparent
- area need not be black, and logical functions are supported.
- @n @b Note: on Windows, blitting with masks can be speeded up
- considerably by compiling 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 wxSystemOptions and
- setting the @c no-maskblt option to 1.
- @param xsrcMask
- Source x position on the mask. If both xsrcMask and ysrcMask are
- -1, xsrc and ysrc will be assumed for the mask source position.
- Currently only implemented on Windows.
- @param ysrcMask
- Source y position on the mask. If both xsrcMask and ysrcMask are
- -1, xsrc and ysrc will be assumed for the mask source position.
- Currently only implemented on Windows.
-
- @remarks There is partial support for Blit() in wxPostScriptDC, under X.
-
- @see StretchBlit(), wxMemoryDC, wxBitmap, wxMask
+ @name Coordinate conversion functions
*/
- bool Blit(wxCoord xdest, wxCoord ydest, wxCoord width,
- wxCoord height, wxDC* source, wxCoord xsrc, wxCoord ysrc,
- int logicalFunc = wxCOPY, bool useMask = false,
- wxCoord xsrcMask = -1, wxCoord ysrcMask = -1);
+ //@{
/**
- Adds the specified point to the bounding box which can be retrieved
- with MinX(), MaxX() and MinY(), MaxY() functions.
-
- @see ResetBoundingBox()
+ Convert @e device X coordinate to logical coordinate, using the current
+ mapping mode, user scale factor, device origin and axis orientation.
*/
- void CalcBoundingBox(wxCoord x, wxCoord y);
+ wxCoord DeviceToLogicalX(wxCoord x) const;
/**
- Clears the device context using the current background brush.
+ Convert @e device X coordinate to relative logical coordinate, using the
+ current mapping mode and user scale factor but ignoring the
+ axis orientation. Use this for converting a width, for example.
*/
- void Clear();
+ wxCoord DeviceToLogicalXRel(wxCoord x) const;
/**
- 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.
+ Converts @e device Y coordinate to logical coordinate, using the current
+ mapping mode, user scale factor, device origin and axis orientation.
*/
- virtual void ComputeScaleAndOrigin();
+ wxCoord DeviceToLogicalY(wxCoord y) const;
/**
- 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.
+ Convert @e device Y coordinate to relative logical coordinate, using the
+ current mapping mode and user scale factor but ignoring the
+ axis orientation. Use this for converting a height, for example.
*/
- void CrossHair(wxCoord x, wxCoord y);
+ wxCoord DeviceToLogicalYRel(wxCoord y) const;
/**
- Destroys the current clipping region so that none of the DC is clipped.
+ Converts logical X coordinate to device coordinate, using the current
+ mapping mode, user scale factor, device origin and axis orientation.
+ */
+ wxCoord LogicalToDeviceX(wxCoord x) const;
- @see SetClippingRegion()
+ /**
+ Converts logical X coordinate to relative device coordinate, using the
+ current mapping mode and user scale factor but ignoring the
+ axis orientation. Use this for converting a width, for example.
*/
- void DestroyClippingRegion();
+ wxCoord LogicalToDeviceXRel(wxCoord x) const;
/**
- Convert device X coordinate to logical coordinate, using the current
- mapping mode.
+ Converts logical Y coordinate to device coordinate, using the current
+ mapping mode, user scale factor, device origin and axis orientation.
*/
- virtual wxCoord DeviceToLogicalX(wxCoord x);
+ wxCoord LogicalToDeviceY(wxCoord y) const;
/**
- 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.
+ Converts logical Y coordinate to relative device coordinate, using the
+ current mapping mode and user scale factor but ignoring the
+ axis orientation. Use this for converting a height, for example.
*/
- virtual wxCoord DeviceToLogicalXRel(wxCoord x);
+ wxCoord LogicalToDeviceYRel(wxCoord y) const;
+
+ //@}
+
+
/**
- Converts device Y coordinate to logical coordinate, using the current
- mapping mode.
+ @name Drawing functions
*/
- virtual wxCoord DeviceToLogicalY(wxCoord y);
+ //@{
/**
- 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.
+ Clears the device context using the current background brush.
*/
- virtual wxCoord DeviceToLogicalYRel(wxCoord y);
+ void Clear();
/**
Draws an arc of a circle, centred on (@a xc, @a yc), with starting
@@ -193,7 +229,7 @@ public:
to the end point.
*/
void DrawArc(wxCoord x1, wxCoord y1, wxCoord x2, wxCoord y2,
- wxCoord xc, wxCoord yc);
+ wxCoord xc, wxCoord yc);
/**
Draw a bitmap on the device context at the specified point. If
@@ -208,27 +244,30 @@ public:
@see SetTextForeground(), SetTextBackground(), wxMemoryDC
*/
void DrawBitmap(const wxBitmap& bitmap, wxCoord x, wxCoord y,
- bool transparent);
+ bool useMask = false);
- //@{
/**
Draws a check mark inside the given rectangle.
*/
void DrawCheckMark(wxCoord x, wxCoord y, wxCoord width, wxCoord height);
+
+ /**
+ @overload
+ */
void DrawCheckMark(const wxRect& rect);
- //@}
- //@{
/**
Draws a circle with the given centre and radius.
@see DrawEllipse()
*/
void DrawCircle(wxCoord x, wxCoord y, wxCoord radius);
+
+ /**
+ @overload
+ */
void DrawCircle(const wxPoint& pt, wxCoord radius);
- //@}
- //@{
/**
Draws an ellipse contained in the rectangle specified either with the
given top left corner and the given size or directly. The current pen
@@ -237,9 +276,16 @@ public:
@see DrawCircle()
*/
void DrawEllipse(wxCoord x, wxCoord y, wxCoord width, wxCoord height);
+
+ /**
+ @overload
+ */
void DrawEllipse(const wxPoint& pt, const wxSize& size);
+
+ /**
+ @overload
+ */
void DrawEllipse(const wxRect& rect);
- //@}
/**
Draws an arc of an ellipse. The current pen is used for drawing the arc
@@ -267,21 +313,23 @@ public:
*/
void DrawIcon(const wxIcon& icon, wxCoord x, wxCoord y);
- //@{
/**
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.
*/
- virtual void DrawLabel(const wxString& text, const wxBitmap& image,
- const wxRect& rect,
- int alignment = wxALIGN_LEFT | wxALIGN_TOP,
- int indexAccel = -1, wxRect* rectBounding = NULL);
+ void DrawLabel(const wxString& text, const wxBitmap& image,
+ const wxRect& rect,
+ int alignment = wxALIGN_LEFT | wxALIGN_TOP,
+ int indexAccel = -1, wxRect* rectBounding = NULL);
+
+ /**
+ @overload
+ */
void DrawLabel(const wxString& text, const wxRect& rect,
int alignment = wxALIGN_LEFT | wxALIGN_TOP,
int indexAccel = -1);
- //@}
/**
Draws a line from the first point to the second. The current pen is
@@ -333,7 +381,8 @@ public:
for filling the shape. Using a transparent brush suppresses filling.
*/
void DrawPolygon(int n, wxPoint points[], wxCoord xoffset = 0,
- wxCoord yoffset = 0, int fill_style = wxODDEVEN_RULE);
+ wxCoord yoffset = 0,
+ wxPolygonFillMode fill_style = wxODDEVEN_RULE);
/**
This method draws a filled polygon using a list of wxPoints, adding the
optional offset coordinate. The first and last points are automatically
@@ -354,7 +403,7 @@ public:
*/
void DrawPolygon(const wxPointList* points,
wxCoord xoffset = 0, wxCoord yoffset = 0,
- int fill_style = wxODDEVEN_RULE);
+ wxPolygonFillMode fill_style = wxODDEVEN_RULE);
/**
Draws two or more filled polygons using an array of @a points, adding
@@ -385,7 +434,7 @@ public:
*/
void DrawPolyPolygon(int n, int count[], wxPoint points[],
wxCoord xoffset = 0, wxCoord yoffset = 0,
- int fill_style = wxODDEVEN_RULE);
+ wxPolygonFillMode fill_style = wxODDEVEN_RULE);
/**
Draws a rectangle with the given top left corner, and with the given
@@ -423,7 +472,6 @@ public:
void DrawRoundedRectangle(wxCoord x, wxCoord y, wxCoord width,
wxCoord height, double radius);
- //@{
/**
Draws a spline between all given points using the current pen.
@@ -433,10 +481,17 @@ public:
@endWxPythonOnly
*/
void DrawSpline(int n, wxPoint points[]);
+
+ /**
+ @overload
+ */
void DrawSpline(const wxPointList* points);
+
+ /**
+ @overload
+ */
void DrawSpline(wxCoord x1, wxCoord y1, wxCoord x2, wxCoord y2,
wxCoord x3, wxCoord y3);
- //@}
/**
Draws a text string at the specified point, using the current text
@@ -446,22 +501,52 @@ public:
the string. See GetTextExtent() for how to get the dimensions of a text
string, which can be used to position the text more precisely.
- @note Under wxGTK, the current
- @ref GetLogicalFunction() "logical function" is used by this
- function but it is ignored by wxMSW. Thus, you should avoid using
- logical functions with this function in portable programs.
+ @note The current @ref GetLogicalFunction() "logical function" is
+ ignored by this function.
*/
void DrawText(const wxString& text, wxCoord x, wxCoord y);
/**
- Ends a document (only relevant when outputting to a printer).
+ Fill the area specified by rect with a radial gradient, starting from
+ @a initialColour at the centre of the circle and fading to
+ @a destColour on the circle outside.
+
+ The circle is placed at the centre of @a rect.
+
+ @note Currently this function is very slow, don't use it for real-time
+ drawing.
*/
- void EndDoc();
+ void GradientFillConcentric(const wxRect& rect,
+ const wxColour& initialColour,
+ const wxColour& destColour);
/**
- Ends a document page (only relevant when outputting to a printer).
+ Fill the area specified by rect with a radial gradient, starting from
+ @a initialColour at the centre of the circle and fading to
+ @a destColour on the circle outside.
+
+ @a circleCenter are the relative coordinates of centre of the circle in
+ the specified @a rect.
+
+ @note Currently this function is very slow, don't use it for real-time
+ drawing.
*/
- void EndPage();
+ void GradientFillConcentric(const wxRect& rect,
+ const wxColour& initialColour,
+ const wxColour& destColour,
+ const wxPoint& circleCenter);
+
+ /**
+ Fill the area specified by @a rect with a linear gradient, starting
+ from @a initialColour and eventually fading to @e destColour.
+
+ The @a nDirection specifies the direction of the colour change, default is
+ to use @a initialColour on the left part of the rectangle and
+ @a destColour on the right one.
+ */
+ void GradientFillLinear(const wxRect& rect, const wxColour& initialColour,
+ const wxColour& destColour,
+ wxDirection nDirection = wxRIGHT);
/**
Flood fills the device context starting from the given point, using
@@ -479,38 +564,29 @@ public:
exactly. However the function will still return @true.
*/
bool FloodFill(wxCoord x, wxCoord y, const wxColour& colour,
- int style = wxFLOOD_SURFACE);
+ wxFloodFillStyle style = wxFLOOD_SURFACE);
/**
- Gets the brush used for painting the background.
-
- @see wxDC::SetBackground()
+ 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.
*/
- const wxBrush GetBackground() const;
+ void CrossHair(wxCoord x, wxCoord y);
- /**
- Returns the current background mode: @c wxSOLID or @c wxTRANSPARENT.
+ //@}
- @see SetBackgroundMode()
- */
- int GetBackgroundMode() const;
/**
- Gets the current brush.
-
- @see wxDC::SetBrush()
+ @name Clipping region functions
*/
- const wxBrush GetBrush() const;
+ //@{
/**
- Gets the character height of the currently set font.
- */
- wxCoord GetCharHeight();
+ Destroys the current clipping region so that none of the DC is clipped.
- /**
- Gets the average character width of the currently set font.
+ @see SetClippingRegion()
*/
- wxCoord GetCharWidth();
+ void DestroyClippingRegion();
/**
Gets the rectangle surrounding the current clipping region.
@@ -520,49 +596,60 @@ public:
are returned as a tuple.
@endWxPythonOnly
*/
- void GetClippingBox(wxCoord x, wxCoord y, wxCoord width, wxCoord height);
+ void GetClippingBox(wxCoord *x, wxCoord *y, wxCoord *width, wxCoord *height) const;
/**
- Returns the depth (number of bits/pixel) of this DC.
+ Sets the clipping region for this device context to the intersection of
+ the given region described by the parameters of this method and the
+ previously set clipping region. You should call DestroyClippingRegion()
+ if you want to set the clipping region exactly to the region specified.
- @see wxDisplayDepth()
+ The clipping region is an area to which drawing is restricted. Possible
+ uses for the clipping region are for clipping text or for speeding up
+ window redraws when only a known area of the screen is damaged.
+
+ @see DestroyClippingRegion(), wxRegion
*/
- int GetDepth() const;
+ void SetClippingRegion(wxCoord x, wxCoord y, wxCoord width, wxCoord height);
/**
- Gets the current font. Notice that even although each device context
- object has some default font after creation, this method would return a
- wxNullFont initially and only after calling SetFont() a valid font is
- returned.
+ @overload
*/
- const wxFont GetFont() const;
+ void SetClippingRegion(const wxPoint& pt, const wxSize& sz);
/**
- Gets the current layout direction of the device context. On platforms
- where RTL layout is supported, the return value will either be
- @c wxLayout_LeftToRight or @c wxLayout_RightToLeft. If RTL layout is
- not supported, the return value will be @c wxLayout_Default.
-
- @see SetLayoutDirection()
+ @overload
*/
- wxLayoutDirection GetLayoutDirection() const;
+ void SetClippingRegion(const wxRect& rect);
/**
- Gets the current logical function.
+ Sets the clipping region for this device context.
- @see SetLogicalFunction()
- */
- int GetLogicalFunction();
+ Unlike SetClippingRegion(), this function works with physical
+ coordinates and not with the logical ones.
+ */
+ void SetDeviceClippingRegion(const wxRegion& region);
- /**
- Gets the mapping mode for the device context.
+ //@}
- @see SetMapMode()
+
+ /**
+ @name Text/character extent functions
*/
- int GetMapMode();
+ //@{
/**
- Gets the dimensions of the string using the currently selected font.
+ Gets the character height of the currently set font.
+ */
+ wxCoord GetCharHeight() const;
+
+ /**
+ Gets the average character width of the currently set font.
+ */
+ wxCoord GetCharWidth() const;
+
+ /**
+ Gets the dimensions of the string using the currently selected font.
@a string is the text string to measure, @e heightLine, if non @NULL,
is where to store the height of a single line.
@@ -579,7 +666,7 @@ public:
void GetMultiLineTextExtent(const wxString& string, wxCoord* w,
wxCoord* h,
wxCoord* heightLine = NULL,
- wxFont* font = NULL) const;
+ const wxFont* font = NULL) const;
/**
Gets the dimensions of the string using the currently selected font.
@a string is the text string to measure, @e heightLine, if non @NULL,
@@ -591,7 +678,7 @@ public:
@see wxFont, SetFont(), GetPartialTextExtents(), GetTextExtent()
*/
- const wxSize GetMultiLineTextExtent(const wxString& string) const;
+ wxSize GetMultiLineTextExtent(const wxString& string) const;
/**
Fills the @a widths array with the widths from the beginning of @a text
@@ -611,74 +698,6 @@ public:
bool GetPartialTextExtents(const wxString& text,
wxArrayInt& widths) const;
- /**
- Gets the current pen.
-
- @see SetPen()
- */
- const wxPen GetPen() const;
-
- /**
- Gets in @a colour the colour at the specified location. Not available
- for wxPostScriptDC or wxMetafileDC.
-
- @note Setting a pixel can be done using DrawPoint().
-
- @beginWxPythonOnly
- The wxColour value is returned and is not required as a parameter.
- @endWxPythonOnly
- */
- bool GetPixel(wxCoord x, wxCoord y, wxColour* colour);
-
- /**
- Returns the resolution of the device in pixels per inch.
- */
- wxSize GetPPI() const;
-
- //@{
- /**
- This gets the horizontal and vertical resolution in device units. It
- can be used to scale graphics to fit the page.
-
- For example, if @e maxX and @e maxY 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:
-
- @code
- wxCoord w, h;
- dc.GetSize(&w, &h);
- double scaleX = (double)(maxX / w);
- double scaleY = (double)(maxY / h);
- dc.SetUserScale(min(scaleX, scaleY),min(scaleX, scaleY));
- @endcode
-
- @beginWxPythonOnly
- In place of a single overloaded method name, wxPython implements the
- following methods:
- - GetSize() - Returns a wxSize.
- - GetSizeWH() - Returns a 2-tuple (width, height).
- @endWxPythonOnly
- */
- void GetSize(wxCoord* width, wxCoord* height) const;
- const wxSize GetSize() const;
- //@}
-
- //@{
- /**
- Returns the horizontal and vertical resolution in millimetres.
- */
- void GetSizeMM(wxCoord* width, wxCoord* height) const;
- const wxSize GetSizeMM() const;
- //@}
-
- /**
- Gets the current text background colour.
-
- @see SetTextBackground()
- */
- const wxColour GetTextBackground() const;
-
- //@{
/**
Gets the dimensions of the string using the currently selected font.
@a string is the text string to measure, @a descent is the dimension
@@ -709,312 +728,242 @@ public:
wxCoord* descent = NULL,
wxCoord* externalLeading = NULL,
const wxFont* font = NULL) const;
- const wxSize GetTextExtent(const wxString& string) const;
- //@}
/**
- Gets the current text foreground colour.
-
- @see SetTextForeground()
+ @overload
*/
- const wxColour GetTextForeground() const;
+ wxSize GetTextExtent(const wxString& string) const;
- /**
- Gets the current user scale factor.
+ //@}
- @see SetUserScale()
- */
- void GetUserScale(double x, double y);
- //@{
/**
- Fill the area specified by rect with a radial gradient, starting from
- @a initialColour at the centre of the circle and fading to
- @a destColour on the circle outside.
+ @name Text properties functions
+ */
+ //@{
- @a circleCenter are the relative coordinates of centre of the circle in
- the specified @e rect. If not specified, the circle is placed at the
- centre of rect.
+ /**
+ Returns the current background mode: @c wxSOLID or @c wxTRANSPARENT.
- @note Currently this function is very slow, don't use it for real-time
- drawing.
+ @see SetBackgroundMode()
*/
- void GradientFillConcentric(const wxRect& rect,
- const wxColour& initialColour,
- const wxColour& destColour);
- void GradientFillConcentric(const wxRect& rect,
- const wxColour& initialColour,
- const wxColour& destColour,
- const wxPoint& circleCenter);
- //@}
+ int GetBackgroundMode() const;
/**
- Fill the area specified by @a rect with a linear gradient, starting
- from @a initialColour and eventually fading to @e destColour. The
- @a nDirection specifies the direction of the colour change, default is
- to use @a initialColour on the left part of the rectangle and
- @a destColour on the right one.
+ Gets the current font. Notice that even although each device context
+ object has some default font after creation, this method would return a
+ ::wxNullFont initially and only after calling SetFont() a valid font is
+ returned.
*/
- void GradientFillLinear(const wxRect& rect,
- const wxColour& initialColour,
- const wxColour& destColour,
- wxDirection nDirection = wxEAST);
+ const wxFont& GetFont() const;
/**
- Returns @true if the DC is ok to use.
+ Gets the current layout direction of the device context. On platforms
+ where RTL layout is supported, the return value will either be
+ @c wxLayout_LeftToRight or @c wxLayout_RightToLeft. If RTL layout is
+ not supported, the return value will be @c wxLayout_Default.
+
+ @see SetLayoutDirection()
*/
- bool Ok();
+ wxLayoutDirection GetLayoutDirection() const;
/**
- Converts logical X coordinate to device coordinate, using the current
- mapping mode.
+ Gets the current text background colour.
+
+ @see SetTextBackground()
*/
- virtual wxCoord LogicalToDeviceX(wxCoord x);
+ const wxColour& GetTextBackground() const;
/**
- 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.
+ Gets the current text foreground colour.
+
+ @see SetTextForeground()
*/
- virtual wxCoord LogicalToDeviceXRel(wxCoord x);
+ const wxColour& GetTextForeground() const;
/**
- Converts logical Y coordinate to device coordinate, using the current
- mapping mode.
+ @a mode may be one of wxSOLID and wxTRANSPARENT. This setting
+ determines whether text will be drawn with a background colour or not.
*/
- virtual wxCoord LogicalToDeviceY(wxCoord y);
+ void SetBackgroundMode(int mode);
/**
- 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.
+ Sets the current font for the DC. It must be a valid font, in
+ particular you should not pass wxNullFont to this method.
+
+ @see wxFont
*/
- virtual wxCoord LogicalToDeviceYRel(wxCoord y);
+ void SetFont(const wxFont& font);
/**
- Gets the maximum horizontal extent used in drawing commands so far.
+ Sets the current text background colour for the DC.
*/
- wxCoord MaxX();
+ void SetTextBackground(const wxColour& colour);
/**
- Gets the maximum vertical extent used in drawing commands so far.
+ Sets the current text foreground colour for the DC.
+
+ @see wxMemoryDC for the interpretation of colours when drawing into a
+ monochrome bitmap.
*/
- wxCoord MaxY();
+ void SetTextForeground(const wxColour& colour);
/**
- Gets the minimum horizontal extent used in drawing commands so far.
+ Sets the current layout direction for the device context. @a dir may be
+ either @c wxLayout_Default, @c wxLayout_LeftToRight or
+ @c wxLayout_RightToLeft.
+
+ @see GetLayoutDirection()
*/
- wxCoord MinX();
+ void SetLayoutDirection(wxLayoutDirection dir);
+
+ //@}
+
/**
- Gets the minimum vertical extent used in drawing commands so far.
+ @name Bounding box functions
*/
- wxCoord MinY();
+ //@{
/**
- Resets the bounding box: after a call to this function, the bounding
- box doesn't contain anything.
+ Adds the specified point to the bounding box which can be retrieved
+ with MinX(), MaxX() and MinY(), MaxY() functions.
- @see CalcBoundingBox()
+ @see ResetBoundingBox()
*/
- void ResetBoundingBox();
+ void CalcBoundingBox(wxCoord x, wxCoord y);
/**
- Sets the x and y axis orientation (i.e., the direction from lowest to
- highest values on the axis). The default orientation is x axis from
- left to right and y axis from top down.
-
- @param xLeftRight
- True to set the x axis orientation to the natural left to right
- orientation, @false to invert it.
- @param yBottomUp
- True to set the y axis orientation to the natural bottom up
- orientation, @false to invert it.
+ Gets the maximum horizontal extent used in drawing commands so far.
*/
- void SetAxisOrientation(bool xLeftRight, bool yBottomUp);
+ wxCoord MaxX() const;
/**
- Sets the current background brush for the DC.
+ Gets the maximum vertical extent used in drawing commands so far.
*/
- void SetBackground(const wxBrush& brush);
+ wxCoord MaxY() const;
/**
- @a mode may be one of wxSOLID and wxTRANSPARENT. This setting
- determines whether text will be drawn with a background colour or not.
+ Gets the minimum horizontal extent used in drawing commands so far.
*/
- void SetBackgroundMode(int mode);
+ wxCoord MinX() const;
/**
- Sets the current brush for the DC.
-
- If the argument is wxNullBrush, the current brush is selected out of
- the device context (leaving wxDC without any valid brush), allowing the
- current brush to be destroyed safely.
-
- @see wxBrush, wxMemoryDC (for the interpretation of colours when
- drawing into a monochrome bitmap)
+ Gets the minimum vertical extent used in drawing commands so far.
*/
- void SetBrush(const wxBrush& brush);
+ wxCoord MinY() const;
- //@{
/**
- Sets the clipping region for this device context to the intersection of
- the given region described by the parameters of this method and the
- previously set clipping region. You should call DestroyClippingRegion()
- if you want to set the clipping region exactly to the region specified.
-
- The clipping region is an area to which drawing is restricted. Possible
- uses for the clipping region are for clipping text or for speeding up
- window redraws when only a known area of the screen is damaged.
+ Resets the bounding box: after a call to this function, the bounding
+ box doesn't contain anything.
- @see DestroyClippingRegion(), wxRegion
+ @see CalcBoundingBox()
*/
- void SetClippingRegion(wxCoord x, wxCoord y, wxCoord width,
- wxCoord height);
- void SetClippingRegion(const wxPoint& pt, const wxSize& sz);
- void SetClippingRegion(const wxRect& rect);
- //@}
+ void ResetBoundingBox();
- /**
- Sets the clipping region for this device context.
+ //@}
- Unlike SetClippingRegion(), this function works with physical
- coordinates and not with the logical ones.
- */
- void SetDeviceClippingRegion(const wxRegion& region);
/**
- 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.
+ @name Page and document start/end functions
*/
- void SetDeviceOrigin(wxCoord x, wxCoord y);
+ //@{
/**
- Sets the current font for the DC. It must be a valid font, in
- particular you should not pass wxNullFont to this method.
-
- @see wxFont
+ Starts a document (only relevant when outputting to a printer).
+ @a message is a message to show while printing.
*/
- void SetFont(const wxFont& font);
+ bool StartDoc(const wxString& message);
/**
- Sets the current layout direction for the device context. @a dir may be
- either @c wxLayout_Default, @c wxLayout_LeftToRight or
- @c wxLayout_RightToLeft.
-
- @see GetLayoutDirection()
+ Starts a document page (only relevant when outputting to a printer).
*/
- void SetLayoutDirection(wxLayoutDirection dir);
+ void StartPage();
/**
- Sets the current logical function for the device context. This
- determines how a source pixel (from a pen or brush colour, or source
- device context if using Blit()) combines with a destination pixel in
- the current device context.
-
- The possible values and their meaning in terms of source and
- destination pixel values are as follows:
-
- @verbatim
- wxAND src AND dst
- wxAND_INVERT (NOT src) AND dst
- wxAND_REVERSE src AND (NOT dst)
- wxCLEAR 0
- wxCOPY src
- wxEQUIV (NOT src) XOR dst
- wxINVERT NOT dst
- wxNAND (NOT src) OR (NOT dst)
- wxNOR (NOT src) AND (NOT dst)
- wxNO_OP dst
- wxOR src OR dst
- wxOR_INVERT (NOT src) OR dst
- wxOR_REVERSE src OR (NOT dst)
- wxSET 1
- wxSRC_INVERT NOT src
- wxXOR src XOR dst
- @endverbatim
-
- The default is wxCOPY, which simply draws with the current colour. 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.
+ Ends a document (only relevant when outputting to a printer).
*/
- void SetLogicalFunction(int function);
+ void EndDoc();
/**
- The mapping mode of the device context defines the unit of measurement
- used to convert logical units to device units. Note that in X, text
- drawing isn't handled consistently with the mapping mode; a font is
- always specified in point size. However, setting the user scale (see
- SetUserScale()) scales the text appropriately. In Windows, scalable
- TrueType fonts are always used; in X, results depend on availability of
- fonts, but usually a reasonable match is found.
+ Ends a document page (only relevant when outputting to a printer).
+ */
+ void EndPage();
- The coordinate origin is always at the top left of the screen/printer.
+ //@}
- 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:
- - wxMM_TWIPS: Each logical unit is 1/20 of a point, or 1/1440 of an
- inch.
- - wxMM_POINTS: Each logical unit is a point, or 1/72 of an inch.
- - wxMM_METRIC: Each logical unit is 1 mm.
- - wxMM_LOMETRIC: Each logical unit is 1/10 of a mm.
- - wxMM_TEXT: Each logical unit is 1 device pixel.
+ /**
+ @name Bit-Block Transfer operations (blit)
*/
- void SetMapMode(int mode);
+ //@{
/**
- 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 wxPalette
- */
- void SetPalette(const wxPalette& palette);
-
- /**
- Sets the current pen for the DC. If the argument is wxNullPen, the
- current pen is selected out of the device context (leaving wxDC without
- any valid pen), allowing the current brush to be destroyed safely.
-
- @see wxMemoryDC for the interpretation of colours when drawing into a
- monochrome bitmap.
- */
- void SetPen(const wxPen& pen);
-
- /**
- Sets the current text background colour for the DC.
- */
- void SetTextBackground(const wxColour& colour);
-
- /**
- Sets the current text foreground colour for the DC.
-
- @see wxMemoryDC for the interpretation of colours when drawing into a
- monochrome bitmap.
- */
- void SetTextForeground(const wxColour& colour);
+ Copy from a source DC to this DC, specifying the destination
+ coordinates, size of area to copy, source DC, source coordinates,
+ logical function, whether to use a bitmap mask, and mask source
+ position.
- /**
- Sets the user scaling factor, useful for applications which require
- 'zooming'.
- */
- void SetUserScale(double xScale, double yScale);
+ @param xdest
+ Destination device context x position.
+ @param ydest
+ Destination device context y position.
+ @param width
+ Width of source area to be copied.
+ @param height
+ Height of source area to be copied.
+ @param source
+ Source device context.
+ @param xsrc
+ Source device context x position.
+ @param ysrc
+ Source device context y position.
+ @param logicalFunc
+ Logical function to use, see SetLogicalFunction().
+ @param 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:
+
+ - Creates a temporary bitmap and copies the destination area into
+ it.
+ - Copies the source area into the temporary bitmap using the
+ specified logical function.
+ - Sets the masked area in the temporary bitmap to BLACK by ANDing
+ the mask bitmap with the temp bitmap with the foreground colour
+ set to WHITE and the bg colour set to BLACK.
+ - Sets the unmasked area in the destination area to BLACK by
+ ANDing the mask bitmap with the destination area with the
+ foreground colour set to BLACK and the background colour set to
+ WHITE.
+ - ORs the temporary bitmap with the destination area.
+ - Deletes the temporary bitmap.
+
+ This sequence of operations ensures that the source's transparent
+ area need not be black, and logical functions are supported.
+ @n @b Note: on Windows, blitting with masks can be speeded up
+ considerably by compiling 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 wxSystemOptions and
+ setting the @c no-maskblt option to 1.
+ @param xsrcMask
+ Source x position on the mask. If both xsrcMask and ysrcMask are
+ @c -1, xsrc and ysrc will be assumed for the mask source position.
+ Currently only implemented on Windows.
+ @param ysrcMask
+ Source y position on the mask. If both xsrcMask and ysrcMask are
+ @c -1, xsrc and ysrc will be assumed for the mask source position.
+ Currently only implemented on Windows.
- /**
- Starts a document (only relevant when outputting to a printer).
- @a message is a message to show while printing.
- */
- bool StartDoc(const wxString& message);
+ @remarks There is partial support for Blit() in wxPostScriptDC, under X.
- /**
- Starts a document page (only relevant when outputting to a printer).
+ @see StretchBlit(), wxMemoryDC, wxBitmap, wxMask
*/
- bool StartPage();
+ bool Blit(wxCoord xdest, wxCoord ydest, wxCoord width,
+ wxCoord height, wxDC* source, wxCoord xsrc, wxCoord ysrc,
+ wxRasterOperationMode logicalFunc = wxCOPY, bool useMask = false,
+ wxCoord xsrcMask = wxDefaultCoord, wxCoord ysrcMask = wxDefaultCoord);
/**
Copy from a source DC to this DC, specifying the destination
@@ -1071,12 +1020,12 @@ public:
setting the @c no-maskblt option to 1.
@param xsrcMask
Source x position on the mask. If both xsrcMask and ysrcMask are
- -1, xsrc and ysrc will be assumed for the mask source position.
- Currently only implemented on Windows.
+ wxDefaultCoord, @a xsrc and @a ysrc will be assumed for the mask
+ source position. Currently only implemented on Windows.
@param ysrcMask
Source y position on the mask. If both xsrcMask and ysrcMask are
- -1, xsrc and ysrc will be assumed for the mask source position.
- Currently only implemented on Windows.
+ wxDefaultCoord, @a xsrc and @a ysrc will be assumed for the mask
+ source position. Currently only implemented on Windows.
There is partial support for Blit() in wxPostScriptDC, under X.
@@ -1092,16 +1041,242 @@ public:
wxCoord dstWidth, wxCoord dstHeight,
wxDC* source, wxCoord xsrc, wxCoord ysrc,
wxCoord srcWidth, wxCoord srcHeight,
- int logicalFunc = wxCOPY,
+ wxRasterOperationMode logicalFunc = wxCOPY,
bool useMask = false,
- wxCoord xsrcMask = -1, wxCoord ysrcMask = -1);
+ wxCoord xsrcMask = wxDefaultCoord,
+ wxCoord ysrcMask = wxDefaultCoord);
+ //@}
+
+
+ /**
+ @name Background/foreground brush and pen
+ */
+ //@{
+
+ /**
+ Gets the brush used for painting the background.
+
+ @see wxDC::SetBackground()
+ */
+ const wxBrush& GetBackground() const;
+
+ /**
+ Gets the current brush.
+
+ @see wxDC::SetBrush()
+ */
+ const wxBrush& GetBrush() const;
+
+ /**
+ Gets the current pen.
+
+ @see SetPen()
+ */
+ const wxPen& GetPen() const;
+
+ /**
+ Sets the current background brush for the DC.
+ */
+ void SetBackground(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 (leaving wxDC without any valid brush), allowing the
+ current brush to be destroyed safely.
+
+ @see wxBrush, wxMemoryDC (for the interpretation of colours when
+ drawing into a monochrome bitmap)
+ */
+ void SetBrush(const wxBrush& brush);
+
+ /**
+ Sets the current pen for the DC. If the argument is wxNullPen, the
+ current pen is selected out of the device context (leaving wxDC without
+ any valid pen), allowing the current brush to be destroyed safely.
+
+ @see wxMemoryDC for the interpretation of colours when drawing into a
+ monochrome bitmap.
+ */
+ void SetPen(const wxPen& pen);
+
+ //@}
+
+
+
+ /**
+ Returns the depth (number of bits/pixel) of this DC.
+
+ @see wxDisplayDepth()
+ */
+ int GetDepth() const;
+
+ /**
+ Returns the current device origin.
+
+ @see SetDeviceOrigin()
+ */
+ wxPoint GetDeviceOrigin() const;
+
+ /**
+ Gets the current logical function.
+
+ @see SetLogicalFunction()
+ */
+ wxRasterOperationMode GetLogicalFunction() const;
+
+ /**
+ Gets the current mapping mode for the device context.
+
+ @see SetMapMode()
+ */
+ wxMappingMode GetMapMode() const;
+
+ /**
+ Gets in @a colour the colour at the specified location. Not available
+ for wxPostScriptDC or wxMetafileDC.
+
+ @note Setting a pixel can be done using DrawPoint().
+
+ @beginWxPythonOnly
+ The wxColour value is returned and is not required as a parameter.
+ @endWxPythonOnly
+ */
+ bool GetPixel(wxCoord x, wxCoord y, wxColour* colour) const;
+
+ /**
+ Returns the resolution of the device in pixels per inch.
+ */
+ wxSize GetPPI() const;
+
+ /**
+ Gets the horizontal and vertical extent of this device context in @e device units.
+ It can be used to scale graphics to fit the page.
+
+ For example, if @e maxX and @e maxY 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:
+
+ @code
+ wxCoord w, h;
+ dc.GetSize(&w, &h);
+ double scaleX = (double)(maxX / w);
+ double scaleY = (double)(maxY / h);
+ dc.SetUserScale(min(scaleX, scaleY),min(scaleX, scaleY));
+ @endcode
+
+ @beginWxPythonOnly
+ In place of a single overloaded method name, wxPython implements the
+ following methods:
+ - GetSize() - Returns a wxSize.
+ - GetSizeWH() - Returns a 2-tuple (width, height).
+ @endWxPythonOnly
+ */
+ void GetSize(wxCoord* width, wxCoord* height) const;
+
+ /**
+ @overload
+ */
+ wxSize GetSize() const;
+
+ /**
+ Returns the horizontal and vertical resolution in millimetres.
+ */
+ void GetSizeMM(wxCoord* width, wxCoord* height) const;
+
+ /**
+ @overload
+ */
+ wxSize GetSizeMM() const;
+
+ /**
+ Gets the current user scale factor.
+
+ @see SetUserScale()
+ */
+ void GetUserScale(double* x, double* y) const;
+
+ /**
+ Returns @true if the DC is ok to use.
+ */
+ bool IsOk() const;
+
+ /**
+ Sets the x and y axis orientation (i.e., the direction from lowest to
+ highest values on the axis). The default orientation is x axis from
+ left to right and y axis from top down.
+
+ @param xLeftRight
+ True to set the x axis orientation to the natural left to right
+ orientation, @false to invert it.
+ @param yBottomUp
+ True to set the y axis orientation to the natural bottom up
+ orientation, @false to invert it.
+ */
+ void SetAxisOrientation(bool xLeftRight, bool yBottomUp);
+
+ /**
+ 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.
+ */
+ void SetDeviceOrigin(wxCoord x, wxCoord y);
+
+ /**
+ Sets the current logical function for the device context.
+ It determines how a @e source pixel (from a pen or brush colour, or source
+ device context if using Blit()) combines with a @e destination pixel in
+ the current device context.
+ Text drawing is not affected by this function.
+
+ See ::wxRasterOperationMode enumeration values for more info.
+
+ The default is @c wxCOPY, which simply draws with the current colour.
+ The others combine the current colour and the background using a logical
+ operation. @c wxINVERT is commonly used for drawing rubber bands or moving
+ outlines, since drawing twice reverts to the original colour.
+ */
+ void SetLogicalFunction(wxRasterOperationMode function);
+
+ /**
+ The mapping mode of the device context defines the unit of measurement
+ used to convert @e logical units to @e device units.
+
+ Note that in X, text drawing isn't handled consistently with the mapping mode;
+ a font is always specified in point size. However, setting the user scale (see
+ SetUserScale()) scales the text appropriately. In Windows, scalable
+ TrueType fonts are always used; in X, results depend on availability of
+ fonts, but usually a reasonable match is found.
+
+ The coordinate origin is always at the top left of the screen/printer.
+
+ Drawing to a Windows printer device context uses the current mapping
+ mode, but mapping mode is currently ignored for PostScript output.
+ */
+ void SetMapMode(wxMappingMode mode);
+
+ /**
+ 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 wxPalette
+ */
+ void SetPalette(const wxPalette& palette);
+
+ /**
+ Sets the user scaling factor, useful for applications which require
+ 'zooming'.
+ */
+ void SetUserScale(double xScale, double yScale);
};
/**
@class wxDCClipper
- @wxheader{dc.h}
wxDCClipper is a small helper class for setting a clipping region on a wxDC
and unsetting it automatically. An object of wxDCClipper class is typically
@@ -1126,7 +1301,8 @@ public:
@library{wxcore}
@category{gdi}
- @see wxDC::SetClippingRegion()
+ @see wxDC::SetClippingRegion(), wxDCFontChanger, wxDCTextColourChanger, wxDCPenChanger,
+ wxDCBrushChanger
*/
class wxDCClipper
{
@@ -1139,7 +1315,145 @@ public:
*/
wxDCClipper(wxDC& dc, const wxRegion& r);
wxDCClipper(wxDC& dc, const wxRect& rect);
- wxDCClipper(wxDC& dc, int x, int y, int w, int h);
+ wxDCClipper(wxDC& dc, wxCoord x, wxCoord y, wxCoord w, wxCoord h);
//@}
+
+ /**
+ Destroys the clipping region associated with the DC passed to the ctor.
+ */
+ ~wxDCClipper();
+};
+
+
+/**
+ @class wxDCBrushChanger
+
+ wxDCBrushChanger is a small helper class for setting a brush on a wxDC
+ and unsetting it automatically in the destructor, restoring the previous one.
+
+ @library{wxcore}
+ @category{gdi}
+
+ @see wxDC::SetBrush(), wxDCFontChanger, wxDCTextColourChanger, wxDCPenChanger,
+ wxDCClipper
+*/
+class wxDCBrushChanger
+{
+public:
+ /**
+ Sets @a brush on the given @a dc, storing the old one.
+
+ @param dc
+ The DC where the brush must be temporary set.
+ @param brush
+ The brush to set.
+ */
+ wxDCBrushChanger(wxDC& dc, const wxBrush& brush);
+
+ /**
+ Restores the brush originally selected in the DC passed to the ctor.
+ */
+ ~wxDCBrushChanger();
+};
+
+
+/**
+ @class wxDCPenChanger
+
+ wxDCPenChanger is a small helper class for setting a pen on a wxDC
+ and unsetting it automatically in the destructor, restoring the previous one.
+
+ @library{wxcore}
+ @category{gdi}
+
+ @see wxDC::SetPen(), wxDCFontChanger, wxDCTextColourChanger, wxDCBrushChanger,
+ wxDCClipper
+*/
+class wxDCPenChanger
+{
+public:
+ /**
+ Sets @a pen on the given @a dc, storing the old one.
+
+ @param dc
+ The DC where the pen must be temporary set.
+ @param pen
+ The pen to set.
+ */
+ wxDCPenChanger(wxDC& dc, const wxPen& pen);
+
+ /**
+ Restores the pen originally selected in the DC passed to the ctor.
+ */
+ ~wxDCPenChanger();
+};
+
+
+
+/**
+ @class wxDCTextColourChanger
+
+ wxDCTextColourChanger is a small helper class for setting a foreground
+ text colour on a wxDC and unsetting it automatically in the destructor,
+ restoring the previous one.
+
+ @library{wxcore}
+ @category{gdi}
+
+ @see wxDC::SetTextForeground(), wxDCFontChanger, wxDCPenChanger, wxDCBrushChanger,
+ wxDCClipper
+*/
+class wxDCTextColourChanger
+{
+public:
+ /**
+ Sets @a col on the given @a dc, storing the old one.
+
+ @param dc
+ The DC where the colour must be temporary set.
+ @param col
+ The colour to set.
+ */
+ wxDCTextColourChanger(wxDC& dc, const wxColour& col);
+
+ /**
+ Restores the colour originally selected in the DC passed to the ctor.
+ */
+ ~wxDCTextColourChanger();
+};
+
+
+
+/**
+ @class wxDCFontChanger
+
+ wxDCFontChanger is a small helper class for setting a font on a wxDC and
+ unsetting it automatically in the destructor, restoring the previous one.
+
+ @since 2.9.0
+
+ @library{wxcore}
+ @category{gdi}
+
+ @see wxDC::SetFont(), wxDCTextColourChanger, wxDCPenChanger, wxDCBrushChanger,
+ wxDCClipper
+*/
+class wxDCFontChanger
+{
+public:
+ /**
+ Sets @a font on the given @a dc, storing the old one.
+
+ @param dc
+ The DC where the font must be temporary set.
+ @param font
+ The font to set.
+ */
+ wxDCFontChanger(wxDC& dc, const wxFont& font);
+
+ /**
+ Restores the colour originally selected in the DC passed to the ctor.
+ */
+ ~wxDCFontChanger();
};