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wxWidgets/include/wx/graphics.h
Paul Cornett 52cc838b12 Implement 0-width pen consistently in wxGraphicsContext 
Emulate a 1-pixel pen width as closely as possible.

This reverts:
334cf1cc91 (Take HiDPI scale into account for wxGCDC 0-width pen, 2021-04-03)
0d80050057 (Make wxGCDC behavior with 0-width wxPen consistent with MSW wxDC, 2021-03-02)

See #19077, #19115
2021-04-05 09:56:28 -07:00

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/////////////////////////////////////////////////////////////////////////////
// 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/peninfobase.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 */
};
enum wxGradientType
{
wxGRADIENT_NONE,
wxGRADIENT_LINEAR,
wxGRADIENT_RADIAL
};
class WXDLLIMPEXP_FWD_CORE wxDC;
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 positive 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;
wxDECLARE_DYNAMIC_CLASS(wxGraphicsObject);
};
class WXDLLIMPEXP_CORE wxGraphicsPen : public wxGraphicsObject
{
public:
wxGraphicsPen() {}
virtual ~wxGraphicsPen() {}
private:
wxDECLARE_DYNAMIC_CLASS(wxGraphicsPen);
};
extern WXDLLIMPEXP_DATA_CORE(wxGraphicsPen) wxNullGraphicsPen;
class WXDLLIMPEXP_CORE wxGraphicsBrush : public wxGraphicsObject
{
public:
wxGraphicsBrush() {}
virtual ~wxGraphicsBrush() {}
private:
wxDECLARE_DYNAMIC_CLASS(wxGraphicsBrush);
};
extern WXDLLIMPEXP_DATA_CORE(wxGraphicsBrush) wxNullGraphicsBrush;
class WXDLLIMPEXP_CORE wxGraphicsFont : public wxGraphicsObject
{
public:
wxGraphicsFont() {}
virtual ~wxGraphicsFont() {}
private:
wxDECLARE_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:
wxDECLARE_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 values 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:
wxDECLARE_DYNAMIC_CLASS(wxGraphicsMatrix);
};
extern WXDLLIMPEXP_DATA_CORE(wxGraphicsMatrix) wxNullGraphicsMatrix;
// ----------------------------------------------------------------------------
// wxGradientStop and wxGradientStops: Specify what intermediate colors are used
// and how they are spread out in a gradient
// ----------------------------------------------------------------------------
// gcc 9 gives a nonsensical warning about implicitly generated move ctor not
// throwing but not being noexcept, suppress it.
#if wxCHECK_GCC_VERSION(9, 1) && !wxCHECK_GCC_VERSION(10, 0)
wxGCC_WARNING_SUPPRESS(noexcept)
#endif
// Describes a single gradient stop.
class wxGraphicsGradientStop
{
public:
wxGraphicsGradientStop(wxColour col = wxTransparentColour,
float pos = 0.0f)
: 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;
};
#if wxCHECK_GCC_VERSION(9, 1) && !wxCHECK_GCC_VERSION(10, 0)
wxGCC_WARNING_RESTORE(noexcept)
#endif
// 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<wxGraphicsGradientStop> m_stops;
};
// ----------------------------------------------------------------------------
// wxGraphicsPenInfo describes a wxGraphicsPen
// ----------------------------------------------------------------------------
class wxGraphicsPenInfo : public wxPenInfoBase<wxGraphicsPenInfo>
{
public:
explicit wxGraphicsPenInfo(const wxColour& colour = wxColour(),
wxDouble width = 1.0,
wxPenStyle style = wxPENSTYLE_SOLID)
: wxPenInfoBase<wxGraphicsPenInfo>(colour, style)
{
m_width = width;
m_gradientType = wxGRADIENT_NONE;
}
// Setters
wxGraphicsPenInfo& Width(wxDouble width)
{ m_width = width; return *this; }
wxGraphicsPenInfo&
LinearGradient(wxDouble x1, wxDouble y1, wxDouble x2, wxDouble y2,
const wxColour& c1, const wxColour& c2,
const wxGraphicsMatrix& matrix = wxNullGraphicsMatrix)
{
m_gradientType = wxGRADIENT_LINEAR;
m_x1 = x1;
m_y1 = y1;
m_x2 = x2;
m_y2 = y2;
m_stops.SetStartColour(c1);
m_stops.SetEndColour(c2);
m_matrix = matrix;
return *this;
}
wxGraphicsPenInfo&
LinearGradient(wxDouble x1, wxDouble y1, wxDouble x2, wxDouble y2,
const wxGraphicsGradientStops& stops,
const wxGraphicsMatrix& matrix = wxNullGraphicsMatrix)
{
m_gradientType = wxGRADIENT_LINEAR;
m_x1 = x1;
m_y1 = y1;
m_x2 = x2;
m_y2 = y2;
m_stops = stops;
m_matrix = matrix;
return *this;
}
wxGraphicsPenInfo&
RadialGradient(wxDouble startX, wxDouble startY,
wxDouble endX, wxDouble endY, wxDouble radius,
const wxColour& oColor, const wxColour& cColor,
const wxGraphicsMatrix& matrix = wxNullGraphicsMatrix)
{
m_gradientType = wxGRADIENT_RADIAL;
m_x1 = startX;
m_y1 = startY;
m_x2 = endX;
m_y2 = endY;
m_radius = radius;
m_stops.SetStartColour(oColor);
m_stops.SetEndColour(cColor);
m_matrix = matrix;
return *this;
}
wxGraphicsPenInfo&
RadialGradient(wxDouble startX, wxDouble startY,
wxDouble endX, wxDouble endY,
wxDouble radius, const wxGraphicsGradientStops& stops,
const wxGraphicsMatrix& matrix = wxNullGraphicsMatrix)
{
m_gradientType = wxGRADIENT_RADIAL;
m_x1 = startX;
m_y1 = startY;
m_x2 = endX;
m_y2 = endY;
m_radius = radius;
m_stops = stops;
m_matrix = matrix;
return *this;
}
// Accessors
wxDouble GetWidth() const { return m_width; }
wxGradientType GetGradientType() const { return m_gradientType; }
wxDouble GetX1() const { return m_x1; }
wxDouble GetY1() const { return m_y1; }
wxDouble GetX2() const { return m_x2; }
wxDouble GetY2() const { return m_y2; }
wxDouble GetStartX() const { return m_x1; }
wxDouble GetStartY() const { return m_y1; }
wxDouble GetEndX() const { return m_x2; }
wxDouble GetEndY() const { return m_y2; }
wxDouble GetRadius() const { return m_radius; }
const wxGraphicsGradientStops& GetStops() const { return m_stops; }
const wxGraphicsMatrix& GetMatrix() const { return m_matrix; }
private:
wxDouble m_width;
wxGradientType m_gradientType;
wxDouble m_x1, m_y1, m_x2, m_y2; // also used for m_xo, m_yo, m_xc, m_yc
wxDouble m_radius;
wxGraphicsGradientStops m_stops;
wxGraphicsMatrix m_matrix;
};
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:
wxDECLARE_DYNAMIC_CLASS(wxGraphicsPath);
};
extern WXDLLIMPEXP_DATA_CORE(wxGraphicsPath) wxNullGraphicsPath;
class WXDLLIMPEXP_CORE wxGraphicsContext : public wxGraphicsObject
{
public:
wxGraphicsContext(wxGraphicsRenderer* renderer, wxWindow* window = NULL);
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
// Create a context from a DC of unknown type, if supported, returns NULL otherwise
static wxGraphicsContext* CreateFromUnknownDC(const wxDC& dc);
static wxGraphicsContext* CreateFromNative( void * context );
static wxGraphicsContext* CreateFromNativeWindow( void * window );
#ifdef __WXMSW__
static wxGraphicsContext* CreateFromNativeHDC(WXHDC dc);
#endif
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();
// Return the window this context is associated with, if any.
wxWindow* GetWindow() const { return m_window; }
// 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;
wxGraphicsPen CreatePen(const wxPen& pen) const;
wxGraphicsPen CreatePen(const wxGraphicsPenInfo& info) const
{ return DoCreatePen(info); }
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 wxGraphicsMatrix& matrix = wxNullGraphicsMatrix) const;
wxGraphicsBrush
CreateLinearGradientBrush(wxDouble x1, wxDouble y1,
wxDouble x2, wxDouble y2,
const wxGraphicsGradientStops& stops,
const wxGraphicsMatrix& matrix = wxNullGraphicsMatrix) 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 startX, wxDouble startY,
wxDouble endX, wxDouble endY, wxDouble radius,
const wxColour& oColor, const wxColour& cColor,
const wxGraphicsMatrix& matrix = wxNullGraphicsMatrix) const;
wxGraphicsBrush
CreateRadialGradientBrush(wxDouble startX, wxDouble startY,
wxDouble endX, wxDouble endY, wxDouble radius,
const wxGraphicsGradientStops& stops,
const wxGraphicsMatrix& matrix = wxNullGraphicsMatrix) 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 &region ) = 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 bounding box of the clipping region
virtual void GetClipBox(wxDouble* x, wxDouble* y, wxDouble* w, wxDouble* h) = 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) const;
#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 );
// paints a transparent rectangle (only useful for bitmaps or windows)
virtual void ClearRectangle(wxDouble x, wxDouble y, wxDouble w, wxDouble h);
//
// 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() const { return m_enableOffset; }
void SetContentScaleFactor(double contentScaleFactor);
double GetContentScaleFactor() const { return m_contentScaleFactor; }
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 wxGraphicsPen DoCreatePen(const wxGraphicsPenInfo& info) const;
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);
private:
// The associated window, if any, i.e. if one was passed directly to
// Create() or the associated window of the wxDC this context was created
// from.
wxWindow* const m_window;
double m_contentScaleFactor;
wxDECLARE_NO_COPY_CLASS(wxGraphicsContext);
wxDECLARE_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;
wxDECLARE_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();
#ifdef __WXMSW__
#if wxUSE_GRAPHICS_GDIPLUS
static wxGraphicsRenderer* GetGDIPlusRenderer();
#endif
#if wxUSE_GRAPHICS_DIRECT2D
static wxGraphicsRenderer* GetDirect2DRenderer();
#endif
#endif
// 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
wxGraphicsContext* CreateContextFromUnknownDC(const wxDC& dc);
virtual wxGraphicsContext * CreateContextFromNativeContext( void * context ) = 0;
virtual wxGraphicsContext * CreateContextFromNativeWindow( void * window ) = 0;
#ifdef __WXMSW__
virtual wxGraphicsContext * CreateContextFromNativeHDC(WXHDC dc) = 0;
#endif
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 wxGraphicsPenInfo& info) = 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,
const wxGraphicsMatrix& matrix = wxNullGraphicsMatrix) = 0;
virtual wxGraphicsBrush
CreateRadialGradientBrush(wxDouble startX, wxDouble startY,
wxDouble endX, wxDouble endY,
wxDouble radius,
const wxGraphicsGradientStops& stops,
const wxGraphicsMatrix& matrix = wxNullGraphicsMatrix) = 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;
virtual wxGraphicsFont CreateFontAtDPI(const wxFont& font,
const wxRealPoint& dpi,
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);
wxDECLARE_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_
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