///////////////////////////////////////////////////////////////////////////// // Name: wx/graphics.h // Purpose: graphics context header // Author: Stefan Csomor // Modified by: // Created: // Copyright: (c) Stefan Csomor // Licence: wxWindows licence ///////////////////////////////////////////////////////////////////////////// #ifndef _WX_GRAPHICS_H_ #define _WX_GRAPHICS_H_ #include "wx/defs.h" #if wxUSE_GRAPHICS_CONTEXT #include "wx/affinematrix2d.h" #include "wx/geometry.h" #include "wx/colour.h" #include "wx/dynarray.h" #include "wx/font.h" #include "wx/image.h" #include "wx/vector.h" enum wxAntialiasMode { wxANTIALIAS_NONE, // should be 0 wxANTIALIAS_DEFAULT }; enum wxInterpolationQuality { // default interpolation 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 }; enum wxCompositionMode { // R = Result, S = Source, D = Destination, premultiplied with alpha // Ra, Sa, Da their alpha components // classic Porter-Duff compositions // http://keithp.com/~keithp/porterduff/p253-porter.pdf wxCOMPOSITION_INVALID = -1, /* indicates invalid/unsupported mode */ wxCOMPOSITION_CLEAR, /* R = 0 */ wxCOMPOSITION_SOURCE, /* R = S */ wxCOMPOSITION_OVER, /* R = S + D*(1 - Sa) */ wxCOMPOSITION_IN, /* R = S*Da */ wxCOMPOSITION_OUT, /* R = S*(1 - Da) */ wxCOMPOSITION_ATOP, /* R = S*Da + D*(1 - Sa) */ wxCOMPOSITION_DEST, /* R = D, essentially a noop */ wxCOMPOSITION_DEST_OVER, /* R = S*(1 - Da) + D */ wxCOMPOSITION_DEST_IN, /* R = D*Sa */ wxCOMPOSITION_DEST_OUT, /* R = D*(1 - Sa) */ wxCOMPOSITION_DEST_ATOP, /* R = S*(1 - Da) + D*Sa */ wxCOMPOSITION_XOR, /* R = S*(1 - Da) + D*(1 - Sa) */ // mathematical compositions wxCOMPOSITION_ADD /* R = S + D */ }; class WXDLLIMPEXP_FWD_CORE wxWindowDC; class WXDLLIMPEXP_FWD_CORE wxMemoryDC; #if wxUSE_PRINTING_ARCHITECTURE class WXDLLIMPEXP_FWD_CORE wxPrinterDC; #endif #ifdef __WXMSW__ #if wxUSE_ENH_METAFILE class WXDLLIMPEXP_FWD_CORE wxEnhMetaFileDC; #endif #endif class WXDLLIMPEXP_FWD_CORE wxGraphicsContext; class WXDLLIMPEXP_FWD_CORE wxGraphicsPath; class WXDLLIMPEXP_FWD_CORE wxGraphicsMatrix; class WXDLLIMPEXP_FWD_CORE wxGraphicsFigure; class WXDLLIMPEXP_FWD_CORE wxGraphicsRenderer; class WXDLLIMPEXP_FWD_CORE wxGraphicsPen; class WXDLLIMPEXP_FWD_CORE wxGraphicsBrush; class WXDLLIMPEXP_FWD_CORE wxGraphicsFont; class WXDLLIMPEXP_FWD_CORE wxGraphicsBitmap; /* * notes about the graphics context apis * * angles : are measured in radians, 0.0 being in direction of positiv x axis, PI/2 being * in direction of positive y axis. */ // Base class of all objects used for drawing in the new graphics API, the always point back to their // originating rendering engine, there is no dynamic unloading of a renderer currently allowed, // these references are not counted // // The data used by objects like graphics pens etc is ref counted, in order to avoid unnecessary expensive // duplication. Any operation on a shared instance that results in a modified state, uncouples this // instance from the other instances that were shared - using copy on write semantics // class WXDLLIMPEXP_FWD_CORE wxGraphicsObjectRefData; class WXDLLIMPEXP_FWD_CORE wxGraphicsBitmapData; class WXDLLIMPEXP_FWD_CORE wxGraphicsMatrixData; class WXDLLIMPEXP_FWD_CORE wxGraphicsPathData; class WXDLLIMPEXP_CORE wxGraphicsObject : public wxObject { public: wxGraphicsObject(); wxGraphicsObject( wxGraphicsRenderer* renderer ); virtual ~wxGraphicsObject(); bool IsNull() const; // returns the renderer that was used to create this instance, or NULL if it has not been initialized yet wxGraphicsRenderer* GetRenderer() const; wxGraphicsObjectRefData* GetGraphicsData() const; protected: virtual wxObjectRefData* CreateRefData() const wxOVERRIDE; virtual wxObjectRefData* CloneRefData(const wxObjectRefData* data) const wxOVERRIDE; DECLARE_DYNAMIC_CLASS(wxGraphicsObject) }; class WXDLLIMPEXP_CORE wxGraphicsPen : public wxGraphicsObject { public: wxGraphicsPen() {} virtual ~wxGraphicsPen() {} private: DECLARE_DYNAMIC_CLASS(wxGraphicsPen) }; extern WXDLLIMPEXP_DATA_CORE(wxGraphicsPen) wxNullGraphicsPen; class WXDLLIMPEXP_CORE wxGraphicsBrush : public wxGraphicsObject { public: wxGraphicsBrush() {} virtual ~wxGraphicsBrush() {} private: DECLARE_DYNAMIC_CLASS(wxGraphicsBrush) }; extern WXDLLIMPEXP_DATA_CORE(wxGraphicsBrush) wxNullGraphicsBrush; class WXDLLIMPEXP_CORE wxGraphicsFont : public wxGraphicsObject { public: wxGraphicsFont() {} virtual ~wxGraphicsFont() {} private: DECLARE_DYNAMIC_CLASS(wxGraphicsFont) }; extern WXDLLIMPEXP_DATA_CORE(wxGraphicsFont) wxNullGraphicsFont; class WXDLLIMPEXP_CORE wxGraphicsBitmap : public wxGraphicsObject { public: wxGraphicsBitmap() {} virtual ~wxGraphicsBitmap() {} // Convert bitmap to wxImage: this is more efficient than converting to // wxBitmap first and then to wxImage and also works without X server // connection under Unix that wxBitmap requires. #if wxUSE_IMAGE wxImage ConvertToImage() const; #endif // wxUSE_IMAGE void* GetNativeBitmap() const; const wxGraphicsBitmapData* GetBitmapData() const { return (const wxGraphicsBitmapData*) GetRefData(); } wxGraphicsBitmapData* GetBitmapData() { return (wxGraphicsBitmapData*) GetRefData(); } private: DECLARE_DYNAMIC_CLASS(wxGraphicsBitmap) }; extern WXDLLIMPEXP_DATA_CORE(wxGraphicsBitmap) wxNullGraphicsBitmap; class WXDLLIMPEXP_CORE wxGraphicsMatrix : public wxGraphicsObject { public: wxGraphicsMatrix() {} virtual ~wxGraphicsMatrix() {} // concatenates the matrix virtual void Concat( const wxGraphicsMatrix *t ); void Concat( const wxGraphicsMatrix &t ) { Concat( &t ); } // sets the matrix to the respective values virtual void Set(wxDouble a=1.0, wxDouble b=0.0, wxDouble c=0.0, wxDouble d=1.0, wxDouble tx=0.0, wxDouble ty=0.0); // gets the component valuess of the matrix virtual void Get(wxDouble* a=NULL, wxDouble* b=NULL, wxDouble* c=NULL, wxDouble* d=NULL, wxDouble* tx=NULL, wxDouble* ty=NULL) const; // makes this the inverse matrix virtual void Invert(); // returns true if the elements of the transformation matrix are equal ? virtual bool IsEqual( const wxGraphicsMatrix* t) const; bool IsEqual( const wxGraphicsMatrix& t) const { return IsEqual( &t ); } // return true if this is the identity matrix virtual bool IsIdentity() const; // // transformation // // add the translation to this matrix virtual void Translate( wxDouble dx , wxDouble dy ); // add the scale to this matrix virtual void Scale( wxDouble xScale , wxDouble yScale ); // add the rotation to this matrix (radians) virtual void Rotate( wxDouble angle ); // // apply the transforms // // applies that matrix to the point virtual void TransformPoint( wxDouble *x, wxDouble *y ) const; // applies the matrix except for translations virtual void TransformDistance( wxDouble *dx, wxDouble *dy ) const; // returns the native representation virtual void * GetNativeMatrix() const; const wxGraphicsMatrixData* GetMatrixData() const { return (const wxGraphicsMatrixData*) GetRefData(); } wxGraphicsMatrixData* GetMatrixData() { return (wxGraphicsMatrixData*) GetRefData(); } private: DECLARE_DYNAMIC_CLASS(wxGraphicsMatrix) }; extern WXDLLIMPEXP_DATA_CORE(wxGraphicsMatrix) wxNullGraphicsMatrix; class WXDLLIMPEXP_CORE wxGraphicsPath : public wxGraphicsObject { public: wxGraphicsPath() {} virtual ~wxGraphicsPath() {} // // These are the path primitives from which everything else can be constructed // // begins a new subpath at (x,y) virtual void MoveToPoint( wxDouble x, wxDouble y ); void MoveToPoint( const wxPoint2DDouble& p); // adds a straight line from the current point to (x,y) virtual void AddLineToPoint( wxDouble x, wxDouble y ); void AddLineToPoint( const wxPoint2DDouble& p); // adds a cubic Bezier curve from the current point, using two control points and an end point virtual void AddCurveToPoint( wxDouble cx1, wxDouble cy1, wxDouble cx2, wxDouble cy2, wxDouble x, wxDouble y ); void AddCurveToPoint( const wxPoint2DDouble& c1, const wxPoint2DDouble& c2, const wxPoint2DDouble& e); // adds another path virtual void AddPath( const wxGraphicsPath& path ); // closes the current sub-path virtual void CloseSubpath(); // gets the last point of the current path, (0,0) if not yet set virtual void GetCurrentPoint( wxDouble* x, wxDouble* y) const; wxPoint2DDouble GetCurrentPoint() const; // adds an arc of a circle centering at (x,y) with radius (r) from startAngle to endAngle virtual void AddArc( wxDouble x, wxDouble y, wxDouble r, wxDouble startAngle, wxDouble endAngle, bool clockwise ); void AddArc( const wxPoint2DDouble& c, wxDouble r, wxDouble startAngle, wxDouble endAngle, bool clockwise); // // These are convenience functions which - if not available natively will be assembled // using the primitives from above // // adds a quadratic Bezier curve from the current point, using a control point and an end point virtual void AddQuadCurveToPoint( wxDouble cx, wxDouble cy, wxDouble x, wxDouble y ); // appends a rectangle as a new closed subpath virtual void AddRectangle( wxDouble x, wxDouble y, wxDouble w, wxDouble h ); // appends an ellipsis as a new closed subpath fitting the passed rectangle virtual void AddCircle( wxDouble x, wxDouble y, wxDouble r ); // appends a an arc to two tangents connecting (current) to (x1,y1) and (x1,y1) to (x2,y2), also a straight line from (current) to (x1,y1) virtual void AddArcToPoint( wxDouble x1, wxDouble y1 , wxDouble x2, wxDouble y2, wxDouble r ); // appends an ellipse virtual void AddEllipse( wxDouble x, wxDouble y, wxDouble w, wxDouble h); // appends a rounded rectangle virtual void AddRoundedRectangle( wxDouble x, wxDouble y, wxDouble w, wxDouble h, wxDouble radius); // returns the native path virtual void * GetNativePath() const; // give the native path returned by GetNativePath() back (there might be some deallocations necessary) virtual void UnGetNativePath(void *p)const; // transforms each point of this path by the matrix virtual void Transform( const wxGraphicsMatrix& matrix ); // gets the bounding box enclosing all points (possibly including control points) virtual void GetBox(wxDouble *x, wxDouble *y, wxDouble *w, wxDouble *h)const; wxRect2DDouble GetBox()const; virtual bool Contains( wxDouble x, wxDouble y, wxPolygonFillMode fillStyle = wxODDEVEN_RULE)const; bool Contains( const wxPoint2DDouble& c, wxPolygonFillMode fillStyle = wxODDEVEN_RULE)const; const wxGraphicsPathData* GetPathData() const { return (const wxGraphicsPathData*) GetRefData(); } wxGraphicsPathData* GetPathData() { return (wxGraphicsPathData*) GetRefData(); } private: DECLARE_DYNAMIC_CLASS(wxGraphicsPath) }; extern WXDLLIMPEXP_DATA_CORE(wxGraphicsPath) wxNullGraphicsPath; // Describes a single gradient stop. class wxGraphicsGradientStop { public: wxGraphicsGradientStop(wxColour col = wxTransparentColour, float pos = 0.) : m_col(col), m_pos(pos) { } // default copy ctor, assignment operator and dtor are ok const wxColour& GetColour() const { return m_col; } void SetColour(const wxColour& col) { m_col = col; } float GetPosition() const { return m_pos; } void SetPosition(float pos) { wxASSERT_MSG( pos >= 0 && pos <= 1, "invalid gradient stop position" ); m_pos = pos; } private: // The colour of this gradient band. wxColour m_col; // Its starting position: 0 is the beginning and 1 is the end. float m_pos; }; // A collection of gradient stops ordered by their positions (from lowest to // highest). The first stop (index 0, position 0.0) is always the starting // colour and the last one (index GetCount() - 1, position 1.0) is the end // colour. class WXDLLIMPEXP_CORE wxGraphicsGradientStops { public: wxGraphicsGradientStops(wxColour startCol = wxTransparentColour, wxColour endCol = wxTransparentColour) { // we can't use Add() here as it relies on having start/end stops as // first/last array elements so do it manually m_stops.push_back(wxGraphicsGradientStop(startCol, 0.f)); m_stops.push_back(wxGraphicsGradientStop(endCol, 1.f)); } // default copy ctor, assignment operator and dtor are ok for this class // Add a stop in correct order. void Add(const wxGraphicsGradientStop& stop); void Add(wxColour col, float pos) { Add(wxGraphicsGradientStop(col, pos)); } // Get the number of stops. size_t GetCount() const { return m_stops.size(); } // Return the stop at the given index (which must be valid). wxGraphicsGradientStop Item(unsigned n) const { return m_stops.at(n); } // Get/set start and end colours. void SetStartColour(wxColour col) { m_stops[0].SetColour(col); } wxColour GetStartColour() const { return m_stops[0].GetColour(); } void SetEndColour(wxColour col) { m_stops[m_stops.size() - 1].SetColour(col); } wxColour GetEndColour() const { return m_stops[m_stops.size() - 1].GetColour(); } private: // All the stops stored in ascending order of positions. wxVector m_stops; }; class WXDLLIMPEXP_CORE wxGraphicsContext : public wxGraphicsObject { public: wxGraphicsContext(wxGraphicsRenderer* renderer); virtual ~wxGraphicsContext(); static wxGraphicsContext* Create( const wxWindowDC& dc); static wxGraphicsContext * Create( const wxMemoryDC& dc); #if wxUSE_PRINTING_ARCHITECTURE static wxGraphicsContext * Create( const wxPrinterDC& dc); #endif #ifdef __WXMSW__ #if wxUSE_ENH_METAFILE static wxGraphicsContext * Create( const wxEnhMetaFileDC& dc); #endif #endif static wxGraphicsContext* CreateFromNative( void * context ); static wxGraphicsContext* CreateFromNativeWindow( void * window ); static wxGraphicsContext* Create( wxWindow* window ); #if wxUSE_IMAGE // Create a context for drawing onto a wxImage. The image life time must be // greater than that of the context itself as when the context is destroyed // it will copy its contents to the specified image. static wxGraphicsContext* Create(wxImage& image); #endif // wxUSE_IMAGE // create a context that can be used for measuring texts only, no drawing allowed static wxGraphicsContext * Create(); // begin a new document (relevant only for printing / pdf etc) if there is a progress dialog, message will be shown virtual bool StartDoc( const wxString& message ); // done with that document (relevant only for printing / pdf etc) virtual void EndDoc(); // opens a new page (relevant only for printing / pdf etc) with the given size in points // (if both are null the default page size will be used) virtual void StartPage( wxDouble width = 0, wxDouble height = 0 ); // ends the current page (relevant only for printing / pdf etc) virtual void EndPage(); // make sure that the current content of this context is immediately visible virtual void Flush(); wxGraphicsPath CreatePath() const; virtual wxGraphicsPen CreatePen(const wxPen& pen) const; virtual wxGraphicsBrush CreateBrush(const wxBrush& brush ) const; // sets the brush to a linear gradient, starting at (x1,y1) and ending at // (x2,y2) with the given boundary colours or the specified stops 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; // sets the brush to a radial gradient originating at (xo,yc) and ending // on a circle around (xc,yc) with the given radius; the colours may be // specified by just the two extremes or the full array of gradient stops wxGraphicsBrush CreateRadialGradientBrush(wxDouble xo, wxDouble yo, wxDouble xc, wxDouble yc, wxDouble radius, const wxColour& oColor, const wxColour& cColor) const; wxGraphicsBrush CreateRadialGradientBrush(wxDouble xo, wxDouble yo, wxDouble xc, wxDouble yc, wxDouble radius, const wxGraphicsGradientStops& stops) const; // creates a font virtual wxGraphicsFont CreateFont( const wxFont &font , const wxColour &col = *wxBLACK ) const; virtual wxGraphicsFont CreateFont(double sizeInPixels, const wxString& facename, int flags = wxFONTFLAG_DEFAULT, const wxColour& col = *wxBLACK) const; // create a native bitmap representation virtual wxGraphicsBitmap CreateBitmap( const wxBitmap &bitmap ) const; #if wxUSE_IMAGE wxGraphicsBitmap CreateBitmapFromImage(const wxImage& image) const; #endif // wxUSE_IMAGE // create a native bitmap representation virtual wxGraphicsBitmap CreateSubBitmap( const wxGraphicsBitmap &bitmap, wxDouble x, wxDouble y, wxDouble w, wxDouble h ) const; // create a 'native' matrix corresponding to these values virtual wxGraphicsMatrix CreateMatrix( wxDouble a=1.0, wxDouble b=0.0, wxDouble c=0.0, wxDouble d=1.0, wxDouble tx=0.0, wxDouble ty=0.0) const; wxGraphicsMatrix CreateMatrix( const wxAffineMatrix2DBase& mat ) const { wxMatrix2D mat2D; wxPoint2DDouble tr; mat.Get(&mat2D, &tr); return CreateMatrix(mat2D.m_11, mat2D.m_12, mat2D.m_21, mat2D.m_22, tr.m_x, tr.m_y); } // push the current state of the context, ie the transformation matrix on a stack virtual void PushState() = 0; // pops a stored state from the stack virtual void PopState() = 0; // clips drawings to the region intersected with the current clipping region virtual void Clip( const wxRegion ®ion ) = 0; // clips drawings to the rect intersected with the current clipping region virtual void Clip( wxDouble x, wxDouble y, wxDouble w, wxDouble h ) = 0; // resets the clipping to original extent virtual void ResetClip() = 0; // returns the native context virtual void * GetNativeContext() = 0; // returns the current shape antialiasing mode virtual wxAntialiasMode GetAntialiasMode() const { return m_antialias; } // sets the antialiasing mode, returns true if it supported virtual bool SetAntialiasMode(wxAntialiasMode antialias) = 0; // returns the current interpolation quality virtual wxInterpolationQuality GetInterpolationQuality() const { return m_interpolation; } // sets the interpolation quality, returns true if it supported virtual bool SetInterpolationQuality(wxInterpolationQuality interpolation) = 0; // returns the current compositing operator virtual wxCompositionMode GetCompositionMode() const { return m_composition; } // sets the compositing operator, returns true if it supported virtual bool SetCompositionMode(wxCompositionMode op) = 0; // returns the size of the graphics context in device coordinates void GetSize(wxDouble* width, wxDouble* height) const { if ( width ) *width = m_width; if ( height ) *height = m_height; } // returns the resolution of the graphics context in device points per inch virtual void GetDPI( wxDouble* dpiX, wxDouble* dpiY); #if 0 // sets the current alpha on this context virtual void SetAlpha( wxDouble alpha ); // returns the alpha on this context virtual wxDouble GetAlpha() const; #endif // 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 // the BeginLayer call virtual void EndLayer() = 0; // // transformation : changes the current transformation matrix CTM of the context // // translate virtual void Translate( wxDouble dx , wxDouble dy ) = 0; // scale virtual void Scale( wxDouble xScale , wxDouble yScale ) = 0; // rotate (radians) virtual void Rotate( wxDouble angle ) = 0; // concatenates this transform with the current transform of this context virtual void ConcatTransform( const wxGraphicsMatrix& matrix ) = 0; // sets the transform of this context virtual void SetTransform( const wxGraphicsMatrix& matrix ) = 0; // gets the matrix of this context virtual wxGraphicsMatrix GetTransform() const = 0; // // setting the paint // // sets the pen virtual void SetPen( const wxGraphicsPen& pen ); void SetPen( const wxPen& pen ); // sets the brush for filling virtual void SetBrush( const wxGraphicsBrush& brush ); void SetBrush( const wxBrush& brush ); // sets the font virtual void SetFont( const wxGraphicsFont& font ); void SetFont( const wxFont& font, const wxColour& colour ); // strokes along a path with the current pen virtual void StrokePath( const wxGraphicsPath& path ) = 0; // fills a path with the current brush virtual void FillPath( const wxGraphicsPath& path, wxPolygonFillMode fillStyle = wxODDEVEN_RULE ) = 0; // draws a path by first filling and then stroking virtual void DrawPath( const wxGraphicsPath& path, wxPolygonFillMode fillStyle = wxODDEVEN_RULE ); // // text // void DrawText( const wxString &str, wxDouble x, wxDouble y ) { DoDrawText(str, x, y); } void DrawText( const wxString &str, wxDouble x, wxDouble y, wxDouble angle ) { DoDrawRotatedText(str, x, y, angle); } void DrawText( const wxString &str, wxDouble x, wxDouble y, const wxGraphicsBrush& backgroundBrush ) { DoDrawFilledText(str, x, y, backgroundBrush); } void DrawText( const wxString &str, wxDouble x, wxDouble y, wxDouble angle, const wxGraphicsBrush& backgroundBrush ) { DoDrawRotatedFilledText(str, x, y, angle, backgroundBrush); } virtual void GetTextExtent( const wxString &text, wxDouble *width, wxDouble *height, wxDouble *descent = NULL, wxDouble *externalLeading = NULL ) const = 0; virtual void GetPartialTextExtents(const wxString& text, wxArrayDouble& widths) const = 0; // // image support // 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; virtual void DrawIcon( const wxIcon &icon, wxDouble x, wxDouble y, wxDouble w, wxDouble h ) = 0; // // convenience methods // // strokes a single line virtual void StrokeLine( wxDouble x1, wxDouble y1, wxDouble x2, wxDouble y2); // stroke lines connecting each of the points virtual void StrokeLines( size_t n, const wxPoint2DDouble *points); // stroke disconnected lines from begin to end points virtual void StrokeLines( size_t n, const wxPoint2DDouble *beginPoints, const wxPoint2DDouble *endPoints); // draws a polygon virtual void DrawLines( size_t n, const wxPoint2DDouble *points, wxPolygonFillMode fillStyle = wxODDEVEN_RULE ); // draws a rectangle virtual void DrawRectangle( wxDouble x, wxDouble y, wxDouble w, wxDouble h); // draws an ellipse virtual void DrawEllipse( wxDouble x, wxDouble y, wxDouble w, wxDouble h); // draws a rounded rectangle virtual void DrawRoundedRectangle( wxDouble x, wxDouble y, wxDouble w, wxDouble h, wxDouble radius); // wrappers using wxPoint2DDouble TODO // helper to determine if a 0.5 offset should be applied for the drawing operation virtual bool ShouldOffset() const { return false; } // indicates whether the context should try to offset for pixel boundaries, this only makes sense on // bitmap devices like screen, by default this is turned off virtual void EnableOffset(bool enable = true); void DisableOffset() { EnableOffset(false); } bool OffsetEnabled() { return m_enableOffset; } protected: // These fields must be initialized in the derived class ctors. wxDouble m_width, m_height; wxGraphicsPen m_pen; wxGraphicsBrush m_brush; wxGraphicsFont m_font; wxAntialiasMode m_antialias; wxCompositionMode m_composition; wxInterpolationQuality m_interpolation; bool m_enableOffset; protected: // implementations of overloaded public functions: we use different names // for them to avoid the virtual function hiding problems in the derived // classes virtual void DoDrawText(const wxString& str, wxDouble x, wxDouble y) = 0; virtual void DoDrawRotatedText(const wxString& str, wxDouble x, wxDouble y, wxDouble angle); virtual void DoDrawFilledText(const wxString& str, wxDouble x, wxDouble y, const wxGraphicsBrush& backgroundBrush); virtual void DoDrawRotatedFilledText(const wxString& str, wxDouble x, wxDouble y, wxDouble angle, const wxGraphicsBrush& backgroundBrush); wxDECLARE_NO_COPY_CLASS(wxGraphicsContext); DECLARE_ABSTRACT_CLASS(wxGraphicsContext) }; #if 0 // // A graphics figure allows to cache path, pen etc creations, also will be a basis for layering/grouping elements // class WXDLLIMPEXP_CORE wxGraphicsFigure : public wxGraphicsObject { public: wxGraphicsFigure(wxGraphicsRenderer* renderer); virtual ~wxGraphicsFigure(); void SetPath( wxGraphicsMatrix* matrix ); void SetMatrix( wxGraphicsPath* path); // draws this object on the context virtual void Draw( wxGraphicsContext* cg ); // returns the path of this object wxGraphicsPath* GetPath() { return m_path; } // returns the transformation matrix of this object, may be null if there is no transformation necessary wxGraphicsMatrix* GetMatrix() { return m_matrix; } private: wxGraphicsMatrix* m_matrix; wxGraphicsPath* m_path; DECLARE_DYNAMIC_CLASS(wxGraphicsFigure) }; #endif // // The graphics renderer is the instance corresponding to the rendering engine used, eg there is ONE core graphics renderer // instance on OSX. This instance is pointed back to by all objects created by it. Therefore you can create eg additional // paths at any point from a given matrix etc. // class WXDLLIMPEXP_CORE wxGraphicsRenderer : public wxObject { public: wxGraphicsRenderer() {} virtual ~wxGraphicsRenderer() {} static wxGraphicsRenderer* GetDefaultRenderer(); static wxGraphicsRenderer* GetCairoRenderer(); // Context virtual wxGraphicsContext * CreateContext( const wxWindowDC& dc) = 0; virtual wxGraphicsContext * CreateContext( const wxMemoryDC& dc) = 0; #if wxUSE_PRINTING_ARCHITECTURE virtual wxGraphicsContext * CreateContext( const wxPrinterDC& dc) = 0; #endif #ifdef __WXMSW__ #if wxUSE_ENH_METAFILE virtual wxGraphicsContext * CreateContext( const wxEnhMetaFileDC& dc) = 0; #endif #endif virtual wxGraphicsContext * CreateContextFromNativeContext( void * context ) = 0; virtual wxGraphicsContext * CreateContextFromNativeWindow( void * window ) = 0; virtual wxGraphicsContext * CreateContext( wxWindow* window ) = 0; #if wxUSE_IMAGE virtual wxGraphicsContext * CreateContextFromImage(wxImage& image) = 0; #endif // wxUSE_IMAGE // create a context that can be used for measuring texts only, no drawing allowed virtual wxGraphicsContext * CreateMeasuringContext() = 0; // Path virtual wxGraphicsPath CreatePath() = 0; // Matrix virtual wxGraphicsMatrix CreateMatrix( wxDouble a=1.0, wxDouble b=0.0, wxDouble c=0.0, wxDouble d=1.0, wxDouble tx=0.0, wxDouble ty=0.0) = 0; // Paints virtual wxGraphicsPen CreatePen(const wxPen& pen) = 0; virtual wxGraphicsBrush CreateBrush(const wxBrush& brush ) = 0; // Gradient brush creation functions may not honour all the stops specified // stops and use just its boundary colours (this is currently the case // under OS X) virtual wxGraphicsBrush CreateLinearGradientBrush(wxDouble x1, wxDouble y1, wxDouble x2, wxDouble y2, const wxGraphicsGradientStops& stops) = 0; virtual wxGraphicsBrush CreateRadialGradientBrush(wxDouble xo, wxDouble yo, wxDouble xc, wxDouble yc, wxDouble radius, const wxGraphicsGradientStops& stops) = 0; // sets the font virtual wxGraphicsFont CreateFont( const wxFont &font , const wxColour &col = *wxBLACK ) = 0; virtual wxGraphicsFont CreateFont(double sizeInPixels, const wxString& facename, int flags = wxFONTFLAG_DEFAULT, const wxColour& col = *wxBLACK) = 0; // create a native bitmap representation virtual wxGraphicsBitmap CreateBitmap( const wxBitmap &bitmap ) = 0; #if wxUSE_IMAGE virtual wxGraphicsBitmap CreateBitmapFromImage(const wxImage& image) = 0; virtual wxImage CreateImageFromBitmap(const wxGraphicsBitmap& bmp) = 0; #endif // wxUSE_IMAGE // create a graphics bitmap from a native bitmap virtual wxGraphicsBitmap CreateBitmapFromNativeBitmap( void* bitmap ) = 0; // create a subimage from a native image representation virtual wxGraphicsBitmap CreateSubBitmap( const wxGraphicsBitmap &bitmap, wxDouble x, wxDouble y, wxDouble w, wxDouble h ) = 0; virtual wxString GetName() const = 0; virtual void GetVersion(int* major, int* minor = NULL, int* micro = NULL) const = 0; private: wxDECLARE_NO_COPY_CLASS(wxGraphicsRenderer); DECLARE_ABSTRACT_CLASS(wxGraphicsRenderer) }; #if wxUSE_IMAGE inline wxImage wxGraphicsBitmap::ConvertToImage() const { wxGraphicsRenderer* renderer = GetRenderer(); return renderer ? renderer->CreateImageFromBitmap(*this) : wxNullImage; } #endif // wxUSE_IMAGE #endif // wxUSE_GRAPHICS_CONTEXT #endif // _WX_GRAPHICS_H_