// Purpose: interface of various wxGraphics* classes
// Author: wxWidgets team
// RCS-ID: $Id$
-// Licence: wxWindows license
+// Licence: wxWindows licence
/////////////////////////////////////////////////////////////////////////////
/**
{
public:
/**
- Adds an arc of a circle centering at (@a x,@a y) with radius (@a r)
- from @a startAngle to @a endAngle.
+ Adds an arc of a circle.
+
+ The circle is defined by the coordinates of its centre (@a x, @a y) or
+ @a c and its radius @a r. The arc goes from the starting angle @a
+ startAngle to @a endAngle either clockwise or counter-clockwise
+ depending on the value of @a clockwise argument.
+
+ The angles are measured in radians but, contrary to the usual
+ mathematical convention, are always @e clockwise from the horizontal
+ axis.
*/
+ //@{
virtual void AddArc(wxDouble x, wxDouble y, wxDouble r,
wxDouble startAngle, wxDouble endAngle,
bool clockwise);
- /**
- Adds an arc of a circle centering at @a c with radius (@a r)
- from @a startAngle to @a endAngle.
- */
void AddArc(const wxPoint2DDouble& c, wxDouble r,
wxDouble startAngle, wxDouble endAngle, bool clockwise);
+ //@}
/**
Appends a an arc to two tangents connecting (current) to (@a x1,@a y1)
@return @true if the point is within the path.
*/
bool Contains(const wxPoint2DDouble& c,
- int fillStyle = wxODDEVEN_RULE) const;
+ wxPolygonFillMode fillStyle = wxODDEVEN_RULE) const;
/**
@return @true if the point is within the path.
*/
virtual bool Contains(wxDouble x, wxDouble y,
- int fillStyle = wxODDEVEN_RULE) const;
+ wxPolygonFillMode fillStyle = wxODDEVEN_RULE) const;
/**
Gets the bounding box enclosing all points (possibly including control
};
/**
- Anti-aliasing modes used by wxGraphicsContext::SetAntialisingMode
+ Anti-aliasing modes used by wxGraphicsContext::SetAntialiasMode().
*/
enum wxAntialiasMode
{
/** No anti-aliasing */
- wxANTIALIAS_NONE,
-
+ wxANTIALIAS_NONE,
+
/** The default anti-aliasing */
wxANTIALIAS_DEFAULT,
};
/**
- Compositing is done using Porter-Duff compositions
+ Interpolation quality used by wxGraphicsContext::SetInterpolationQuality().
+ */
+enum wxInterpolationQuality
+{
+ /** default interpolation, based on type of context, in general medium quality */
+ wxINTERPOLATION_DEFAULT,
+ /** no interpolation */
+ wxINTERPOLATION_NONE,
+ /** fast interpolation, suited for interactivity */
+ wxINTERPOLATION_FAST,
+ /** better quality */
+ wxINTERPOLATION_GOOD,
+ /** best quality, not suited for interactivity */
+ wxINTERPOLATION_BEST
+};
+
+/**
+ Compositing is done using Porter-Duff compositions
(see http://keithp.com/~keithp/porterduff/p253-porter.pdf) with
- wxGraphicsContext::SetCompositionMode
+ wxGraphicsContext::SetCompositionMode().
The description give a short equation on how the values of a resulting
pixel are calculated.
*/
enum wxCompositionMode
{
+ /**
+ Indicates invalid or unsupported composition mode.
+
+ This value can't be passed to wxGraphicsContext::SetCompositionMode().
+
+ @since 2.9.2
+ */
+ wxCOMPOSITION_INVALID = -1,
wxCOMPOSITION_CLEAR, /**< @e R = 0 */
wxCOMPOSITION_SOURCE, /**< @e R = S */
wxCOMPOSITION_OVER, /**< @e R = @e S + @e D*(1 - @e Sa) */
wxCOMPOSITION_DEST_OUT, /**< @e R = @e D*(1 - @e Sa) */
wxCOMPOSITION_DEST_ATOP, /**< @e R = @e S*(1 - @e Da) + @e D*@e Sa */
wxCOMPOSITION_XOR, /**< @e R = @e S*(1 - @e Da) + @e D*(1 - @e Sa) */
- wxCOMPOSITION_ADD, /**< @e R = @e S + @e D */
+ wxCOMPOSITION_ADD /**< @e R = @e S + @e D */
};
+/**
+ Represents a bitmap.
+
+ The objects of this class are not created directly but only via
+ wxGraphicsContext or wxGraphicsRenderer CreateBitmap(),
+ CreateBitmapFromImage() or CreateSubBitmap() methods. They can subsequently
+ be used with wxGraphicsContext::DrawBitmap(). The only other operation is
+ testing for the bitmap validity which can be performed using IsNull()
+ method inherited from the base class.
+ */
+class wxGraphicsBitmap : public wxGraphicsObject
+{
+public:
+ /**
+ Default constructor creates an invalid bitmap.
+ */
+ wxGraphicsBitmap() {}
+
+ /**
+ Return the contents of this bitmap as wxImage.
+
+ Using this method is more efficient than converting wxGraphicsBitmap to
+ wxBitmap first and then to wxImage and can be useful if, for example,
+ you want to save wxGraphicsBitmap as a disk file in a format not
+ directly supported by wxBitmap.
+
+ Invalid image is returned if the bitmap is invalid.
+
+ @since 2.9.3
+ */
+ wxImage ConvertToImage() const;
+
+ /**
+ Return the pointer to the native bitmap data. (CGImageRef for Core Graphics,
+ cairo_surface_t for Cairo, Bitmap* for GDI+.)
+
+ @since 2.9.4
+ */
+ void* GetNativeBitmap() const;
+};
/**
@class wxGraphicsContext
@see wxGraphicsRenderer::CreateContext()
*/
- static wxGraphicsContext* Create(const wxWindowDC& dc);
+ static wxGraphicsContext* Create(const wxWindowDC& windowDC);
/**
Creates a wxGraphicsContext from a wxMemoryDC
@see wxGraphicsRenderer::CreateContext()
*/
- static wxGraphicsContext* Create(const wxMemoryDC& dc);
+ static wxGraphicsContext* Create(const wxMemoryDC& memoryDC);
/**
Creates a wxGraphicsContext from a wxPrinterDC. Under GTK+, this will
@see wxGraphicsRenderer::CreateContext(), @ref overview_unixprinting
*/
- static wxGraphicsContext* Create(const wxPrinterDC& dc);
+ static wxGraphicsContext* Create(const wxPrinterDC& printerDC);
+
+ /**
+ Creates a wxGraphicsContext from a wxEnhMetaFileDC.
+
+ This function, as wxEnhMetaFileDC class itself, is only available only
+ under MSW.
+
+ @see wxGraphicsRenderer::CreateContext()
+ */
+ static wxGraphicsContext* Create(const wxEnhMetaFileDC& metaFileDC);
+
+ /**
+ Creates a wxGraphicsContext associated with a wxImage.
+
+ The image specifies the size of the context as well as whether alpha is
+ supported (if wxImage::HasAlpha()) or not and the initial contents of
+ the context. The @a image object must have a life time greater than
+ that of the new context as the context copies its contents back to the
+ image when it is destroyed.
+
+ @since 2.9.3
+ */
+ static wxGraphicsContext* Create(wxImage& image);
/**
Clips drawings to the specified region.
*/
virtual void ConcatTransform(const wxGraphicsMatrix& matrix) = 0;
+ /**
+ Creates wxGraphicsBitmap from an existing wxBitmap.
+
+ Returns an invalid wxNullGraphicsBitmap on failure.
+ */
+ virtual wxGraphicsBitmap CreateBitmap( const wxBitmap &bitmap ) = 0;
+
+ /**
+ Creates wxGraphicsBitmap from an existing wxImage.
+
+ This method is more efficient than converting wxImage to wxBitmap first
+ and then calling CreateBitmap() but otherwise has the same effect.
+
+ Returns an invalid wxNullGraphicsBitmap on failure.
+
+ @since 2.9.3
+ */
+ virtual wxGraphicsBitmap CreateBitmapFromImage(const wxImage& image);
+
+ /**
+ Extracts a sub-bitmap from an existing bitmap.
+
+ Currently this function is implemented in the native MSW and OS X
+ versions but not when using Cairo.
+ */
+ virtual wxGraphicsBitmap CreateSubBitmap(const wxGraphicsBitmap& bitmap,
+ wxDouble x, wxDouble y,
+ wxDouble w, wxDouble h) = 0;
+
/**
Creates a native brush from a wxBrush.
*/
virtual wxGraphicsFont CreateFont(const wxFont& font,
const wxColour& col = *wxBLACK) const;
+ /**
+ Creates a font object with the specified attributes.
+
+ The use of overload taking wxFont is preferred, see
+ wxGraphicsRenderer::CreateFont() for more details.
+
+ @since 2.9.3
+ */
+ virtual wxGraphicsFont CreateFont(double sizeInPixels,
+ const wxString& facename,
+ int flags = wxFONTFLAG_DEFAULT,
+ const wxColour& col = *wxBLACK) const;
+
/**
Creates a wxGraphicsContext from a native context. This native context
must be a CGContextRef for Core Graphics, a Graphics pointer for
static wxGraphicsContext* CreateFromNativeWindow(void* window);
/**
- Creates a native brush, having a linear gradient, starting at
- (@a x1, @a y1) with color @a c1 to (@a x2, @a y2) with color @a c2.
+ Creates a native brush with a linear gradient.
+
+ The brush starts at (@a x1, @a y1) and ends at (@a x2, @a y2). Either
+ just the start and end gradient colours (@a c1 and @a c2) or full set
+ of gradient @a stops can be specified.
+
+ The version taking wxGraphicsGradientStops is new in wxWidgets 2.9.1.
*/
- virtual wxGraphicsBrush CreateLinearGradientBrush(wxDouble x1,
- wxDouble y1,
- wxDouble x2,
- wxDouble y2,
- const wxColour& c1,
- const wxColour& c2) const;
+ //@{
+ wxGraphicsBrush
+ CreateLinearGradientBrush(wxDouble x1, wxDouble y1,
+ wxDouble x2, wxDouble y2,
+ const wxColour& c1, const wxColour& c2) const;
+
+ wxGraphicsBrush
+ CreateLinearGradientBrush(wxDouble x1, wxDouble y1,
+ wxDouble x2, wxDouble y2,
+ const wxGraphicsGradientStops& stops) const;
+ //@}
/**
Creates a native affine transformation matrix from the passed in
wxDouble tx = 0.0,
wxDouble ty = 0.0) const;
+ /**
+ Creates a native affine transformation matrix from the passed
+ generic one.
+
+ @since 2.9.4
+ */
+ wxGraphicsMatrix CreateMatrix(const wxAffineMatrix2DBase& mat) const;
+
/**
Creates a native graphics path which is initially empty.
*/
virtual wxGraphicsPen CreatePen(const wxPen& pen) const;
/**
- Creates a native brush, having a radial gradient originating at
- (@a xo, @a yc) with color @a oColour and ends on a circle around
- (@a xc, @a yc) with the given @a radius and color @a cColour.
+ Creates a native brush with a radial gradient.
+
+ The brush originates at (@a xo, @a yc) and ends on a circle around
+ (@a xc, @a yc) with the given @a radius.
+
+ The gradient may be specified either by its start and end colours @a
+ oColor and @a cColor or by a full set of gradient @a stops.
+
+ The version taking wxGraphicsGradientStops is new in wxWidgets 2.9.1.
*/
- virtual wxGraphicsBrush CreateRadialGradientBrush(wxDouble xo, wxDouble yo,
- wxDouble xc, wxDouble yc,
- wxDouble radius,
- const wxColour& oColor,
- const wxColour& cColor) const;
+ //@{
+ virtual wxGraphicsBrush
+ CreateRadialGradientBrush(wxDouble xo, wxDouble yo,
+ wxDouble xc, wxDouble yc,
+ wxDouble radius,
+ const wxColour& oColor,
+ const wxColour& cColor) const;
+
+ virtual wxGraphicsBrush
+ CreateRadialGradientBrush(wxDouble xo, wxDouble yo,
+ wxDouble xc, wxDouble yc,
+ wxDouble radius,
+ const wxGraphicsGradientStops& stops) = 0;
+ //@}
/**
Draws the bitmap. In case of a mono bitmap, this is treated as a mask
and the current brushed is used for filling.
*/
- virtual void DrawBitmap(const wxBitmap& bmp, wxDouble x, wxDouble y,
+ //@{
+ virtual void DrawBitmap(const wxGraphicsBitmap& bmp,
+ wxDouble x, wxDouble y,
+ wxDouble w, wxDouble h ) = 0;
+ virtual void DrawBitmap(const wxBitmap& bmp,
+ wxDouble x, wxDouble y,
wxDouble w, wxDouble h) = 0;
+ //@}
/**
Draws an ellipse.
virtual void StrokeLines(size_t n, const wxPoint2DDouble* beginPoints,
const wxPoint2DDouble* endPoints);
/**
- Stroke disconnected lines from begin to end points, fastest method
- available for this purpose.
+ Stroke lines connecting all the points.
+
+ Unlike the other overload of this function, this method draws a single
+ polyline and not a number of disconnected lines.
*/
virtual void StrokeLines(size_t n, const wxPoint2DDouble* points);
virtual void Translate(wxDouble dx, wxDouble dy) = 0;
/**
- Redirects all rendering is done into a fully transparent temporary context
+ Redirects all rendering is done into a fully transparent temporary context
*/
virtual void BeginLayer(wxDouble opacity) = 0;
- /**
- Composites back the drawings into the context with the opacity given at
+ /**
+ Composites back the drawings into the context with the opacity given at
the BeginLayer call
*/
virtual void EndLayer() = 0;
- /**
+ /**
Sets the antialiasing mode, returns true if it supported
*/
virtual bool SetAntialiasMode(wxAntialiasMode antialias) = 0;
- /**
+ /**
Returns the current shape antialiasing mode
*/
virtual wxAntialiasMode GetAntialiasMode() const ;
-
+
+ /**
+ Sets the interpolation quality, returns true if it is supported.
+
+ Not implemented in Cairo backend currently.
+ */
+ virtual bool SetInterpolationQuality(wxInterpolationQuality interpolation) = 0;
+
+ /**
+ Returns the current interpolation quality.
+ */
+ virtual wxInterpolationQuality GetInterpolationQuality() const;
+
/**
Sets the compositing operator, returns true if it supported
*/
virtual bool SetCompositionMode(wxCompositionMode op) = 0;
- /**
+ /**
Returns the current compositing operator
*/
virtual wxCompositionMode GetCompositionMode() const;
-
+
+
+ /**
+ Push the current state of the context's transformation matrix on a
+ stack.
+
+ @see wxGraphicsContext::PopState
+ */
+ virtual void PushState() = 0;
+
+ /**
+ Pops a stored state from the stack and sets the current transformation
+ matrix to that state.
+
+ @see wxGraphicsContext::PopState
+ */
+ virtual void PopState() = 0;
+
+
+ virtual void EnableOffset(bool enable = true);
+ void DisableOffset();
+ bool OffsetEnabled();
+
};
+/**
+ Represents a single gradient stop in a collection of gradient stops as
+ represented by wxGraphicsGradientStops.
+ @library{wxcore}
+ @category{gdi}
+
+ @since 2.9.1
+*/
+class wxGraphicsGradientStop
+{
+public:
+ /**
+ Creates a stop with the given colour and position.
+
+ @param col The colour of this stop. Note that the alpha component of
+ the colour is honoured thus allowing the background colours to
+ partially show through the gradient.
+ @param pos The stop position, must be in [0, 1] range with 0 being the
+ beginning and 1 the end of the gradient.
+ */
+ wxGraphicsGradientStop(wxColour col = wxTransparentColour, float pos = 0.);
+
+ /// Return the stop colour.
+ const wxColour& GetColour() const;
+
+ /**
+ Change the stop colour.
+
+ @param col The new colour.
+ */
+ void SetColour(const wxColour& col);
+
+ /// Return the stop position.
+ float GetPosition() const;
+
+ /**
+ Change the stop position.
+
+ @param pos The new position, must always be in [0, 1] range.
+ */
+ void SetPosition(float pos);
+};
+
+/**
+ Represents a collection of wxGraphicGradientStop values for use with
+ CreateLinearGradientBrush and CreateRadialGradientBrush.
+
+ The stops are maintained in order of position. If two or more stops are
+ added with the same position then the one(s) added later come later.
+ This can be useful for producing discontinuities in the colour gradient.
+
+ Notice that this class is write-once, you can't modify the stops once they
+ had been added.
+
+ @library{wxcore}
+ @category{gdi}
+
+ @since 2.9.1
+*/
+class wxGraphicsGradientStops
+{
+public:
+ /**
+ Initializes the gradient stops with the given boundary colours.
+
+ Creates a wxGraphicsGradientStops instance with start colour given
+ by @a startCol and end colour given by @a endCol.
+ */
+ wxGraphicsGradientStops(wxColour startCol = wxTransparentColour,
+ wxColour endCol = wxTransparentColour);
+
+ /**
+ Add a new stop.
+ */
+ //@{
+ void Add(const wxGraphicsGradientStop& stop);
+ void Add(wxColour col, float pos);
+ //@}
+
+ /**
+ Returns the stop at the given index.
+
+ @param n The index, must be in [0, GetCount()) range.
+ */
+ wxGraphicsGradientStop Item(unsigned n) const;
+
+ /**
+ Returns the number of stops.
+ */
+ unsigned GetCount() const;
+
+ /**
+ Set the start colour to @a col
+ */
+ void SetStartColour(wxColour col);
+
+ /**
+ Returns the start colour.
+ */
+ wxColour GetStartColour() const;
+
+ /**
+ Set the end colour to @a col
+ */
+ void SetEndColour(wxColour col);
+
+ /**
+ Returns the end colour.
+ */
+ wxColour GetEndColour() const;
+};
/**
@class wxGraphicsRenderer
class wxGraphicsRenderer : public wxObject
{
public:
+ /**
+ Creates wxGraphicsBitmap from an existing wxBitmap.
+
+ Returns an invalid wxNullGraphicsBitmap on failure.
+ */
+ virtual wxGraphicsBitmap CreateBitmap( const wxBitmap &bitmap ) = 0;
+
+ /**
+ Creates wxGraphicsBitmap from an existing wxImage.
+
+ This method is more efficient than converting wxImage to wxBitmap first
+ and then calling CreateBitmap() but otherwise has the same effect.
+
+ Returns an invalid wxNullGraphicsBitmap on failure.
+
+ @since 2.9.3
+ */
+ virtual wxGraphicsBitmap CreateBitmapFromImage(const wxImage& image) = 0;
+
+ /**
+ Creates a wxImage from a wxGraphicsBitmap.
+
+ This method is used by the more convenient wxGraphicsBitmap::ConvertToImage.
+ */
+ virtual wxImage CreateImageFromBitmap(const wxGraphicsBitmap& bmp) = 0;
+
+ /**
+ Creates wxGraphicsBitmap from a native bitmap handle.
+
+ @a bitmap meaning is platform-dependent. Currently it's a GDI+ @c
+ Bitmap pointer under MSW, @c CGImage pointer under OS X or a @c
+ cairo_surface_t pointer when using Cairo under any platform.
+ */
+ virtual wxGraphicsBitmap CreateBitmapFromNativeBitmap( void* bitmap ) = 0;
+
/**
Creates a wxGraphicsContext from a wxWindow.
*/
/**
Creates a wxGraphicsContext from a wxWindowDC
*/
- virtual wxGraphicsContext* CreateContext(const wxWindowDC& dc) = 0 ;
+ virtual wxGraphicsContext* CreateContext(const wxWindowDC& windowDC) = 0 ;
/**
Creates a wxGraphicsContext from a wxMemoryDC
*/
- virtual wxGraphicsContext* CreateContext(const wxMemoryDC& dc) = 0 ;
+ virtual wxGraphicsContext* CreateContext(const wxMemoryDC& memoryDC) = 0 ;
/**
Creates a wxGraphicsContext from a wxPrinterDC
*/
- virtual wxGraphicsContext* CreateContext(const wxPrinterDC& dc) = 0 ;
+ virtual wxGraphicsContext* CreateContext(const wxPrinterDC& printerDC) = 0 ;
+
+ /**
+ Creates a wxGraphicsContext from a wxEnhMetaFileDC.
+
+ This function, as wxEnhMetaFileDC class itself, is only available only
+ under MSW.
+ */
+ virtual wxGraphicsContext* CreateContext(const wxEnhMetaFileDC& metaFileDC) = 0;
+
+ /**
+ Creates a wxGraphicsContext associated with a wxImage.
+
+ This function is used by wxContext::CreateFromImage() and is not
+ normally called directly.
+
+ @since 2.9.3
+ */
+ wxGraphicsContext* CreateContextFromImage(wxImage& image);
/**
Creates a native brush from a wxBrush.
*/
virtual wxGraphicsContext* CreateContextFromNativeWindow(void* window) = 0;
+ /**
+ Creates a wxGraphicsContext that can be used for measuring texts only.
+ No drawing commands are allowed.
+ */
+ virtual wxGraphicsContext * CreateMeasuringContext() = 0;
+
/**
Creates a native graphics font from a wxFont and a text colour.
*/
const wxColour& col = *wxBLACK) = 0;
/**
- Creates a native brush, having a linear gradient, starting at
- (@a x1, @a y1) with color @a c1 to (@a x2, @a y2) with color @a c2.
+ Creates a graphics font with the given characteristics.
+
+ If possible, the CreateFont() overload taking wxFont should be used
+ instead. The main advantage of this overload is that it can be used
+ without X server connection under Unix when using Cairo.
+
+ @param sizeInPixels
+ Height of the font in user space units, i.e. normally pixels.
+ Notice that this is different from the overload taking wxFont as
+ wxFont size is specified in points.
+ @param facename
+ The name of the font. The same font name might not be available
+ under all platforms so the font name can also be empty to use the
+ default platform font.
+ @param flags
+ Combination of wxFontFlag enum elements. Currently only
+ @c wxFONTFLAG_ITALIC and @c wxFONTFLAG_BOLD are supported. By
+ default the normal font version is used.
+ @param col
+ The font colour, black by default.
+
+ @since 2.9.3
+ */
+ virtual wxGraphicsFont CreateFont(double sizeInPixels,
+ const wxString& facename,
+ int flags = wxFONTFLAG_DEFAULT,
+ const wxColour& col = *wxBLACK) = 0;
+
+
+ /**
+ Creates a native brush with a linear gradient.
+
+ Stops support is new since wxWidgets 2.9.1, previously only the start
+ and end colours could be specified.
*/
virtual wxGraphicsBrush CreateLinearGradientBrush(wxDouble x1,
wxDouble y1,
wxDouble x2,
wxDouble y2,
- const wxColour& c1,
- const wxColour& c2) = 0;
+ const wxGraphicsGradientStops& stops) = 0;
/**
Creates a native affine transformation matrix from the passed in
virtual wxGraphicsPen CreatePen(const wxPen& pen) = 0;
/**
- Creates a native brush, having a radial gradient originating at
- (@a xo, @a yc) with color @a oColour and ends on a circle around
- (@a xc, @a yc) with the given @a radius and color @a cColour.
+ Creates a native brush with a radial gradient.
+
+ Stops support is new since wxWidgets 2.9.1, previously only the start
+ and end colours could be specified.
*/
virtual wxGraphicsBrush CreateRadialGradientBrush(wxDouble xo, wxDouble yo,
wxDouble xc, wxDouble yc,
wxDouble radius,
- const wxColour& oColour,
- const wxColour& cColour) = 0;
+ const wxGraphicsGradientStops& stops) = 0;
+
+ /**
+ Extracts a sub-bitmap from an existing bitmap.
+
+ Currently this function is implemented in the native MSW and OS X
+ versions but not when using Cairo.
+ */
+ virtual wxGraphicsBitmap CreateSubBitmap(const wxGraphicsBitmap& bitmap,
+ wxDouble x, wxDouble y,
+ wxDouble w, wxDouble h) = 0;
/**
Returns the default renderer on this platform. On OS X this is the Core
on GTK we currently default to the cairo renderer.
*/
static wxGraphicsRenderer* GetDefaultRenderer();
+ static wxGraphicsRenderer* GetCairoRenderer();
+
};
virtual void Translate(wxDouble dx, wxDouble dy);
};
+
+const wxGraphicsPen wxNullGraphicsPen;
+const wxGraphicsBrush wxNullGraphicsBrush;
+const wxGraphicsFont wxNullGraphicsFont;
+const wxGraphicsBitmap wxNullGraphicsBitmap;
+const wxGraphicsMatrix wxNullGraphicsMatrix;
+const wxGraphicsPath wxNullGraphicsPath;
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