X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/489cc69b396e927bdd62da9970cfe64951071f92..487f6627541e49810f6fb48947a7226717fe17a8:/interface/wx/dc.h?ds=sidebyside diff --git a/interface/wx/dc.h b/interface/wx/dc.h index 704e5b06a4..54b0053602 100644 --- a/interface/wx/dc.h +++ b/interface/wx/dc.h @@ -3,7 +3,7 @@ // Purpose: interface of wxDC // Author: wxWidgets team // RCS-ID: $Id$ -// Licence: wxWindows license +// Licence: wxWindows licence ///////////////////////////////////////////////////////////////////////////// @@ -79,6 +79,28 @@ enum wxMappingMode wxMM_POINTS }; +/** + Simple collection of various font metrics. + + This object is returned by wxDC::GetFontMetrics(). + + @since 2.9.2 + + @library{wxcore} + @category{dc,gdi} + */ +struct wxFontMetrics +{ + /// Constructor initializes all fields to 0. + wxFontMetrics(); + + int height, ///< Total character height. + ascent, ///< Part of the height above the baseline. + descent, ///< Part of the height below the baseline. + internalLeading, ///< Intra-line spacing. + externalLeading, ///< Inter-line spacing. + averageWidth; ///< Average font width, a.k.a. "x-width". +}; /** @@ -91,7 +113,7 @@ enum wxMappingMode wxWidgets offers an alternative drawing API based on the modern drawing backends GDI+, CoreGraphics and Cairo. See wxGraphicsContext, wxGraphicsRenderer and related classes. There is also a wxGCDC linking the APIs by offering - the wxDC API ontop of a wxGraphicsContext. + the wxDC API on top of a wxGraphicsContext. wxDC is an abstract base class and cannot be created directly. Use wxPaintDC, wxClientDC, wxWindowDC, wxScreenDC, wxMemoryDC or @@ -121,7 +143,7 @@ enum wxMappingMode 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 + All wxDC functions use instead @b logical units, unless where explicitly stated. Logical units are arbitrary units mapped to device units using the current mapping mode (see wxDC::SetMapMode). @@ -131,9 +153,25 @@ enum wxMappingMode @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. + In general wxDC methods don't support alpha transparency and the alpha + component of wxColour is simply ignored and you need to use wxGraphicsContext + for full transparency support. There are, however, a few exceptions: first, + under Mac OS X colours with alpha channel are supported in all the normal + wxDC-derived classes as they use wxGraphicsContext internally. Second, + under all platforms wxSVGFileDC also fully supports alpha channel. In both + of these cases the instances of wxPen or wxBrush that are built from + wxColour use the colour's alpha values when stroking or filling. + + + @section Support for Transformation Matrix + + On some platforms (currently only under MSW and only on Windows NT, i.e. + not Windows 9x/ME, systems) wxDC has support for applying an arbitrary + affine transformation matrix to its coordinate system. Call + CanUseTransformMatrix() to check if this support is available and then call + SetTransformMatrix() if it is. If the transformation matrix is not + supported, SetTransformMatrix() always simply returns false and doesn't do + anything. @library{wxcore} @@ -222,15 +260,21 @@ public: /** Draws an arc of a circle, centred on (@a xc, @a yc), with starting - point (@a x1, @a y1) and ending at (@a x2, @a y2). The current pen is - used for the outline and the current brush for filling the shape. + point (@a xStart, @a yStart) and ending at (@a xEnd, @a yEnd). + The current pen is used for the outline and the current brush for + filling the shape. The arc is drawn in a counter-clockwise direction from the start point to the end point. */ - void DrawArc(wxCoord x1, wxCoord y1, wxCoord x2, wxCoord y2, + void DrawArc(wxCoord xStart, wxCoord yStart, wxCoord xEnd, wxCoord yEnd, wxCoord xc, wxCoord yc); + /** + @overload + */ + void DrawArc(const wxPoint& ptStart, const wxPoint& ptEnd, const wxPoint& centre); + /** Draw a bitmap on the device context at the specified point. If @a transparent is @true and the bitmap has a transparency mask, the @@ -246,6 +290,12 @@ public: void DrawBitmap(const wxBitmap& bitmap, wxCoord x, wxCoord y, bool useMask = false); + /** + @overload + */ + void DrawBitmap(const wxBitmap &bmp, const wxPoint& pt, + bool useMask = false); + /** Draws a check mark inside the given rectangle. */ @@ -306,6 +356,12 @@ public: void DrawEllipticArc(wxCoord x, wxCoord y, wxCoord width, wxCoord height, double start, double end); + /** + @overload + */ + void DrawEllipticArc(const wxPoint& pt, const wxSize& sz, + double sa, double ea); + /** 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 @@ -313,13 +369,18 @@ public: */ void DrawIcon(const wxIcon& icon, wxCoord x, wxCoord y); + /** + @overload + */ + void DrawIcon(const wxIcon& icon, const wxPoint& pt); + /** 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. */ - void DrawLabel(const wxString& text, const wxBitmap& image, + void DrawLabel(const wxString& text, const wxBitmap& bitmap, const wxRect& rect, int alignment = wxALIGN_LEFT | wxALIGN_TOP, int indexAccel = -1, wxRect* rectBounding = NULL); @@ -339,14 +400,18 @@ public: */ void DrawLine(wxCoord x1, wxCoord y1, wxCoord x2, wxCoord y2); + /** + @overload + */ + void DrawLine(const wxPoint& pt1, const wxPoint& pt2); + /** Draws lines using an array of points of size @a n adding the optional offset coordinate. The current pen is used for drawing the lines. - @beginWxPythonOnly - The wxPython version of this method accepts a Python list of wxPoint - objects. - @endWxPythonOnly + @beginWxPerlOnly + Not supported by wxPerl. + @endWxPerlOnly */ void DrawLines(int n, wxPoint points[], wxCoord xoffset = 0, wxCoord yoffset = 0); @@ -355,10 +420,11 @@ public: coordinate. The programmer is responsible for deleting the list of points. - @beginWxPythonOnly - The wxPython version of this method accepts a Python list of wxPoint - objects. - @endWxPythonOnly + @beginWxPerlOnly + The wxPerl version of this method accepts + as its first parameter a reference to an array + of wxPoint objects. + @endWxPerlOnly */ void DrawLines(const wxPointList* points, wxCoord xoffset = 0, wxCoord yoffset = 0); @@ -369,6 +435,11 @@ public: */ void DrawPoint(wxCoord x, wxCoord y); + /** + @overload + */ + void DrawPoint(const wxPoint& pt); + /** Draws a filled polygon using an array of points of size @a n, adding the optional offset coordinate. The first and last points are @@ -379,6 +450,10 @@ public: The current pen is used for drawing the outline, and the current brush for filling the shape. Using a transparent brush suppresses filling. + + @beginWxPerlOnly + Not supported by wxPerl. + @endWxPerlOnly */ void DrawPolygon(int n, wxPoint points[], wxCoord xoffset = 0, wxCoord yoffset = 0, @@ -396,10 +471,11 @@ public: The programmer is responsible for deleting the list of points. - @beginWxPythonOnly - The wxPython version of this method accepts a Python list of wxPoint - objects. - @endWxPythonOnly + @beginWxPerlOnly + The wxPerl version of this method accepts + as its first parameter a reference to an array + of wxPoint objects. + @endWxPerlOnly */ void DrawPolygon(const wxPointList* points, wxCoord xoffset = 0, wxCoord yoffset = 0, @@ -427,10 +503,6 @@ public: call to DrawPolyPolygon() must be closed. Unlike polygons created by the DrawPolygon() member function, the polygons created by this method are not closed automatically. - - @beginWxPythonOnly - Not implemented yet. - @endWxPythonOnly */ void DrawPolyPolygon(int n, int count[], wxPoint points[], wxCoord xoffset = 0, wxCoord yoffset = 0, @@ -443,6 +515,16 @@ public: */ void DrawRectangle(wxCoord x, wxCoord y, wxCoord width, wxCoord height); + /** + @overload + */ + void DrawRectangle(const wxPoint& pt, const wxSize& sz); + + /** + @overload + */ + void DrawRectangle(const wxRect& rect); + /** Draws the text rotated by @a angle degrees (positive angles are counterclockwise; the full angle is 360 degrees). @@ -457,6 +539,12 @@ public: void DrawRotatedText(const wxString& text, wxCoord x, wxCoord y, double angle); + /** + @overload + */ + void DrawRotatedText(const wxString& text, const wxPoint& point, + double angle); + /** Draws a rectangle with the given top left corner, and with the given size. The corners are quarter-circles using the given radius. The @@ -473,23 +561,45 @@ public: void DrawRoundedRectangle(wxCoord x, wxCoord y, wxCoord width, wxCoord height, double radius); + /** + @overload + */ + void DrawRoundedRectangle(const wxPoint& pt, const wxSize& sz, + double radius); + + /** + @overload + */ + void DrawRoundedRectangle(const wxRect& rect, double radius); + /** Draws a spline between all given points using the current pen. - @beginWxPythonOnly - The wxPython version of this method accepts a Python list of wxPoint - objects. - @endWxPythonOnly + @beginWxPerlOnly + Not supported by wxPerl. + @endWxPerlOnly */ void DrawSpline(int n, wxPoint points[]); /** @overload + + + @beginWxPerlOnly + The wxPerl version of this method accepts + as its first parameter a reference to an array + of wxPoint objects. + @endWxPerlOnly */ void DrawSpline(const wxPointList* points); /** @overload + + + @beginWxPerlOnly + Not supported by wxPerl. + @endWxPerlOnly */ void DrawSpline(wxCoord x1, wxCoord y1, wxCoord x2, wxCoord y2, wxCoord x3, wxCoord y3); @@ -500,13 +610,23 @@ public: The coordinates refer to the top-left corner of the rectangle bounding the string. See GetTextExtent() for how to get the dimensions of a text - string, which can be used to position the text more precisely. + string, which can be used to position the text more precisely and + DrawLabel() if you need to align the string differently. + + Starting from wxWidgets 2.9.2 @a text parameter can be a multi-line + string, i.e. contain new line characters, and will be rendered + correctly. @note The current @ref GetLogicalFunction() "logical function" is ignored by this function. */ void DrawText(const wxString& text, wxCoord x, wxCoord y); + /** + @overload + */ + void DrawText(const wxString& text, const wxPoint& pt); + /** Fill the area specified by rect with a radial gradient, starting from @a initialColour at the centre of the circle and fading to @@ -563,10 +683,23 @@ public: @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. + + @note This method shouldn't be used with wxPaintDC under non-Windows + platforms as it uses GetPixel() internally and this may give + wrong results, notably in wxGTK. If you need to flood fill + wxPaintDC, create a temporary wxMemoryDC, flood fill it and then + blit it to, or draw as a bitmap on, wxPaintDC. See the example of + doing this in the drawing sample and wxBufferedPaintDC class. */ bool FloodFill(wxCoord x, wxCoord y, const wxColour& colour, wxFloodFillStyle style = wxFLOOD_SURFACE); + /** + @overload + */ + bool FloodFill(const wxPoint& pt, const wxColour& col, + wxFloodFillStyle style = wxFLOOD_SURFACE); + /** 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 @@ -574,6 +707,11 @@ public: */ void CrossHair(wxCoord x, wxCoord y); + /** + @overload + */ + void CrossHair(const wxPoint& pt); + //@} @@ -591,11 +729,6 @@ public: /** Gets the rectangle surrounding the current clipping region. - - @beginWxPythonOnly - No arguments are required and the four values defining the rectangle - are returned as a tuple. - @endWxPythonOnly */ void GetClippingBox(wxCoord *x, wxCoord *y, wxCoord *width, wxCoord *height) const; @@ -656,6 +789,21 @@ public: */ wxCoord GetCharWidth() const; + /** + Returns the various font characteristics. + + This method allows to retrieve some of the font characteristics not + returned by GetTextExtent(), notably internal leading and average + character width. + + Currently this method returns correct results only under wxMSW, in the + other ports the internal leading will always be 0 and the average + character width will be computed as the width of the character 'x'. + + @since 2.9.2 + */ + wxFontMetrics GetFontMetrics() 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, @@ -669,6 +817,12 @@ public: @note This function works with both single-line and multi-line strings. + @beginWxPerlOnly + In wxPerl this method is implemented as + GetMultiLineTextExtent(string, font = undef) returning a + 3-element list (width, height, line_height) + @endWxPerlOnly + @see wxFont, SetFont(), GetPartialTextExtents(), GetTextExtent() */ void GetMultiLineTextExtent(const wxString& string, wxCoord* w, @@ -684,6 +838,10 @@ public: @note This function works with both single-line and multi-line strings. + @beginWxPerlOnly + Not supported by wxPerl. + @endWxPerlOnly + @see wxFont, SetFont(), GetPartialTextExtents(), GetTextExtent() */ wxSize GetMultiLineTextExtent(const wxString& string) const; @@ -696,10 +854,10 @@ public: function that is faster or more accurate than the generic implementation then it should be used instead. - @beginWxPythonOnly - This method only takes the @a text parameter and returns a Python list - of integers. - @endWxPythonOnly + @beginWxPerlOnly + In wxPerl this method only takes the @a text parameter and + returns the widths as a list of integers. + @endWxPerlOnly @see GetMultiLineTextExtent(), GetTextExtent() */ @@ -722,12 +880,11 @@ public: @note This function only works with single-line strings. - @beginWxPythonOnly - The following methods are implemented in wxPython: - - GetTextExtent(string) - Returns a 2-tuple, (width, height). - - GetFullTextExtent(string, font=NULL) - - Returns a 4-tuple, (width, height, descent, externalLeading). - @endWxPythonOnly + @beginWxPerlOnly + In wxPerl this method is implemented as GetTextExtent(string, + font = undef) returning a 4-element list (width, height, + descent, externalLeading) + @endWxPerlOnly @see wxFont, SetFont(), GetPartialTextExtents(), GetMultiLineTextExtent() @@ -739,6 +896,11 @@ public: /** @overload + + + @beginWxPerlOnly + Not supported by wxPerl. + @endWxPerlOnly */ wxSize GetTextExtent(const wxString& string) const; @@ -915,10 +1077,17 @@ 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. + Copy from a source DC to this DC. + + With this method you can specify the destination coordinates and the + size of area to copy which will be the same for both the source and + target DCs. If you need to apply scaling while copying, use + StretchBlit(). + + Notice that source DC coordinates @a xsrc and @a ysrc are interpreted + using the current source DC coordinate system, i.e. the scale, origin + position and axis directions are taken into account when transforming + them to physical (pixel) coordinates. @param xdest Destination device context x position. @@ -959,7 +1128,7 @@ public: 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 + considerably by compiling wxWidgets with the wxUSE_DC_CACHEING 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. @@ -982,10 +1151,18 @@ public: wxCoord xsrcMask = wxDefaultCoord, wxCoord ysrcMask = wxDefaultCoord); /** - Copy from a source DC to this DC, specifying the destination - coordinates, destination size, source DC, source coordinates, size of - source area to copy, logical function, whether to use a bitmap mask, - and mask source position. + Copy from a source DC to this DC possibly changing the scale. + + Unlike Blit(), this method allows to specify different source and + destination region sizes, meaning that it can stretch or shrink it + while copying. The same can be achieved by changing the scale of the + source or target DC but calling this method is simpler and can also be + more efficient if the platform provides a native implementation of it. + + The meaning of its other parameters is the same as with Blit(), in + particular all source coordinates are interpreted using the source DC + coordinate system, i.e. are affected by its scale, origin translation + and axis direction. @param xdest Destination device context x position. @@ -1030,7 +1207,7 @@ public: 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 + considerably by compiling wxWidgets with the wxUSE_DC_CACHEING 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. @@ -1045,8 +1222,6 @@ public: There is partial support for Blit() in wxPostScriptDC, under X. - StretchBlit() is only implemented under wxMAC and wxMSW. - See wxMemoryDC for typical usage. @since 2.9.0 @@ -1170,9 +1345,8 @@ public: @note Setting a pixel can be done using DrawPoint(). - @beginWxPythonOnly - The wxColour value is returned and is not required as a parameter. - @endWxPythonOnly + @note This method shouldn't be used with wxPaintDC as accessing the DC + while drawing can result in unexpected results, notably in wxGTK. */ bool GetPixel(wxCoord x, wxCoord y, wxColour* colour) const; @@ -1197,12 +1371,12 @@ public: 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 + @beginWxPerlOnly + In wxPerl there are two methods instead of a single overloaded + method: + - GetSize(): returns a Wx::Size object. + - GetSizeWH(): returns a 2-element list (width, height). + @endWxPerlOnly */ void GetSize(wxCoord* width, wxCoord* height) const; @@ -1224,6 +1398,11 @@ public: /** Gets the current user scale factor. + @beginWxPerlOnly + In wxPerl this method takes no arguments and return a two + element array (x, y). + @endWxPerlOnly + @see SetUserScale() */ void GetUserScale(double* x, double* y) const; @@ -1302,6 +1481,82 @@ public: 'zooming'. */ void SetUserScale(double xScale, double yScale); + + + /** + @name Transformation matrix + + See the notes about the availability of these functions in the class + documentation. + */ + //@{ + + /** + Check if the use of transformation matrix is supported by the current + system. + + Currently this function always returns @false for non-MSW platforms and + may return @false for old (Windows 9x/ME) Windows systems. Normally + support for the transformation matrix is always available in any + relatively recent Windows versions. + + @since 2.9.2 + */ + bool CanUseTransformMatrix() const; + + /** + Set the transformation matrix. + + If transformation matrix is supported on the current system, the + specified @a matrix will be used to transform between wxDC and physical + coordinates. Otherwise the function returns @false and doesn't change + the coordinate mapping. + + @since 2.9.2 + */ + bool SetTransformMatrix(const wxAffineMatrix2D& matrix); + + /** + Return the transformation matrix used by this device context. + + By default the transformation matrix is the identity matrix. + + @since 2.9.2 + */ + wxAffineMatrix2D GetTransformMatrix() const; + + /** + Revert the transformation matrix to identity matrix. + + @since 2.9.2 + */ + void ResetTransformMatrix(); + + //@} + + + /** + Returns a value that can be used as a handle to the native drawing + context, if this wxDC has something that could be thought of in that + way. (Not all of them do.) + + For example, on Windows the return value is an HDC, on OSX it is a + CGContextRef and on wxGTK it will be a GdkDrawable. If the DC is a + wxGCDC then the return value will be the value returned from + wxGraphicsContext::GetNativeContext. A value of NULL is returned if + the DC does not have anything that fits the handle concept. + + @since 2.9.5 + */ + void* GetHandle() const; + + + void SetLogicalScale(double x, double y); + void GetLogicalScale(double *x, double *y) const; + void SetLogicalOrigin(wxCoord x, wxCoord y); + void GetLogicalOrigin(wxCoord *x, wxCoord *y) const; + wxPoint GetLogicalOrigin() const; + }; @@ -1309,10 +1564,12 @@ public: /** @class wxDCClipper - 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 - created on the stack so that it is automatically destroyed when the object - goes out of scope. A typical usage example: + wxDCClipper is a helper class for setting a clipping region on a wxDC + during its lifetime. + + An object of wxDCClipper class is typically created on the stack so that it + is automatically destroyed when the object goes out of scope. A typical + usage example: @code void MyFunction(wxDC& dc) @@ -1329,6 +1586,12 @@ public: } @endcode + @note Unlike other similar classes such as wxDCFontChanger, wxDCClipper + currently doesn't restore the previously active clipping region when it + is destroyed but simply resets clipping on the associated wxDC. This + may be changed in the future wxWidgets versions but has to be taken + into account explicitly in the current one. + @library{wxcore} @category{gdi} @@ -1344,7 +1607,7 @@ public: The clipping region is automatically unset when this object is destroyed. */ - wxDCClipper(wxDC& dc, const wxRegion& r); + wxDCClipper(wxDC& dc, const wxRegion& region); wxDCClipper(wxDC& dc, const wxRect& rect); wxDCClipper(wxDC& dc, wxCoord x, wxCoord y, wxCoord w, wxCoord h); //@} @@ -1493,6 +1756,18 @@ public: class wxDCFontChanger { public: + /** + Trivial constructor not changing anything. + + This constructor is useful if you don't know beforehand if the font + needs to be changed or not. It simply creates the object which won't do + anything in its destructor unless Set() is called -- in which case it + would reset the previous font. + + @since 2.9.1 + */ + wxDCFontChanger(wxDC& dc); + /** Sets @a font on the given @a dc, storing the old one. @@ -1504,7 +1779,18 @@ public: wxDCFontChanger(wxDC& dc, const wxFont& font); /** - Restores the colour originally selected in the DC passed to the ctor. + Set the font to use. + + This method is meant to be called once only and only on the objects + created with the constructor overload not taking wxColour argument and + has the same effect as the other constructor, i.e. sets the font to + the given @a font and ensures that the old value is restored when this + object is destroyed. + */ + void Set(const wxFont& font); + + /** + Restores the font originally selected in the DC passed to the ctor. */ ~wxDCFontChanger(); };