#include <wx/graphics.h>
A wxGraphicsContext instance is the object that is drawn upon.
It is created by a renderer using wxGraphicsRenderer::CreateContext(). This can be either directly using a renderer instance, or indirectly using the static convenience Create() functions of wxGraphicsContext that always delegate the task to the default renderer.
Public Member Functions | |
Clipping region functions | |
virtual void | ResetClip ()=0 |
Resets the clipping to original shape. More... | |
virtual void | Clip (const wxRegion ®ion)=0 |
Sets the clipping region to the intersection of the given region and the previously set clipping region. More... | |
virtual void | Clip (wxDouble x, wxDouble y, wxDouble w, wxDouble h)=0 |
This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts. More... | |
virtual void | GetClipBox (wxDouble *x, wxDouble *y, wxDouble *w, wxDouble *h)=0 |
Returns bounding box of the current clipping region. More... | |
Transformation 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) const |
Creates a native affine transformation matrix from the passed in values. More... | |
wxGraphicsMatrix | CreateMatrix (const wxAffineMatrix2DBase &mat) const |
Creates a native affine transformation matrix from the passed generic one. More... | |
virtual void | ConcatTransform (const wxGraphicsMatrix &matrix)=0 |
Concatenates the passed in transform with the current transform of this context. More... | |
virtual wxGraphicsMatrix | GetTransform () const =0 |
Gets the current transformation matrix of this context. More... | |
virtual void | Rotate (wxDouble angle)=0 |
Rotates the current transformation matrix (in radians). More... | |
virtual void | Scale (wxDouble xScale, wxDouble yScale)=0 |
Scales the current transformation matrix. More... | |
virtual void | SetTransform (const wxGraphicsMatrix &matrix)=0 |
Sets the current transformation matrix of this context. More... | |
virtual void | Translate (wxDouble dx, wxDouble dy)=0 |
Translates the current transformation matrix. More... | |
Brush and pen functions | |
virtual wxGraphicsBrush | CreateBrush (const wxBrush &brush) const |
Creates a native brush from a wxBrush. More... | |
wxGraphicsBrush | CreateLinearGradientBrush (wxDouble x1, wxDouble y1, wxDouble x2, wxDouble y2, const wxColour &c1, const wxColour &c2, const wxGraphicsMatrix &matrix=wxNullGraphicsMatrix) const |
Creates a native brush with a linear gradient. More... | |
wxGraphicsBrush | CreateLinearGradientBrush (wxDouble x1, wxDouble y1, wxDouble x2, wxDouble y2, const wxGraphicsGradientStops &stops, const wxGraphicsMatrix &matrix=wxNullGraphicsMatrix) const |
This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts. More... | |
virtual wxGraphicsBrush | CreateRadialGradientBrush (wxDouble startX, wxDouble startY, wxDouble endX, wxDouble endY, wxDouble radius, const wxColour &oColor, const wxColour &cColor, const wxGraphicsMatrix &matrix=wxNullGraphicsMatrix) const |
Creates a native brush with a radial gradient. More... | |
virtual wxGraphicsBrush | CreateRadialGradientBrush (wxDouble startX, wxDouble startY, wxDouble endX, wxDouble endY, wxDouble radius, const wxGraphicsGradientStops &stops, const wxGraphicsMatrix &matrix=wxNullGraphicsMatrix)=0 |
This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts. More... | |
void | SetBrush (const wxBrush &brush) |
Sets the brush for filling paths. More... | |
virtual void | SetBrush (const wxGraphicsBrush &brush) |
Sets the brush for filling paths. More... | |
wxGraphicsPen | CreatePen (const wxPen &pen) const |
Creates a native pen from a wxPen. More... | |
wxGraphicsPen | CreatePen (const wxGraphicsPenInfo &info) const |
Creates a native pen from a wxGraphicsPenInfo. More... | |
void | SetPen (const wxPen &pen) |
Sets the pen used for stroking. More... | |
virtual void | SetPen (const wxGraphicsPen &pen) |
Sets the pen used for stroking. More... | |
Drawing functions | |
virtual void | DrawBitmap (const wxGraphicsBitmap &bmp, wxDouble x, wxDouble y, wxDouble w, wxDouble h)=0 |
Draws the bitmap. More... | |
virtual void | DrawBitmap (const wxBitmap &bmp, wxDouble x, wxDouble y, wxDouble w, wxDouble h)=0 |
This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts. More... | |
virtual void | DrawEllipse (wxDouble x, wxDouble y, wxDouble w, wxDouble h) |
Draws an ellipse. More... | |
virtual void | DrawIcon (const wxIcon &icon, wxDouble x, wxDouble y, wxDouble w, wxDouble h)=0 |
Draws the icon. More... | |
virtual void | DrawLines (size_t n, const wxPoint2DDouble *points, wxPolygonFillMode fillStyle=wxODDEVEN_RULE) |
Draws a polygon. More... | |
virtual void | DrawPath (const wxGraphicsPath &path, wxPolygonFillMode fillStyle=wxODDEVEN_RULE) |
Draws the path by first filling and then stroking. More... | |
virtual void | DrawRectangle (wxDouble x, wxDouble y, wxDouble w, wxDouble h) |
Draws a rectangle. More... | |
virtual void | DrawRoundedRectangle (wxDouble x, wxDouble y, wxDouble w, wxDouble h, wxDouble radius) |
Draws a rounded rectangle. More... | |
void | DrawText (const wxString &str, wxDouble x, wxDouble y) |
Draws text at the defined position. More... | |
void | DrawText (const wxString &str, wxDouble x, wxDouble y, wxDouble angle) |
Draws text at the defined position. More... | |
void | DrawText (const wxString &str, wxDouble x, wxDouble y, const wxGraphicsBrush &backgroundBrush) |
Draws text at the defined position. More... | |
void | DrawText (const wxString &str, wxDouble x, wxDouble y, wxDouble angle, const wxGraphicsBrush &backgroundBrush) |
Draws text at the defined position. More... | |
wxGraphicsPath | CreatePath () const |
Creates a native graphics path which is initially empty. More... | |
virtual void | FillPath (const wxGraphicsPath &path, wxPolygonFillMode fillStyle=wxODDEVEN_RULE)=0 |
Fills the path with the current brush. More... | |
virtual void | StrokeLine (wxDouble x1, wxDouble y1, wxDouble x2, wxDouble y2) |
Strokes a single line. More... | |
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. More... | |
virtual void | StrokeLines (size_t n, const wxPoint2DDouble *points) |
Stroke lines connecting all the points. More... | |
virtual void | StrokePath (const wxGraphicsPath &path)=0 |
Strokes along a path with the current pen. More... | |
Text functions | |
virtual wxGraphicsFont | CreateFont (const wxFont &font, const wxColour &col= *wxBLACK) const |
Creates a native graphics font from a wxFont and a text colour. More... | |
virtual wxGraphicsFont | CreateFont (double sizeInPixels, const wxString &facename, int flags=wxFONTFLAG_DEFAULT, const wxColour &col= *wxBLACK) const |
Creates a font object with the specified attributes. More... | |
void | SetFont (const wxFont &font, const wxColour &colour) |
Sets the font for drawing text. More... | |
virtual void | SetFont (const wxGraphicsFont &font) |
Sets the font for drawing text. More... | |
virtual void | GetPartialTextExtents (const wxString &text, wxArrayDouble &widths) const =0 |
Fills the widths array with the widths from the beginning of text to the corresponding character of text. More... | |
virtual void | GetTextExtent (const wxString &text, wxDouble *width, wxDouble *height, wxDouble *descent, wxDouble *externalLeading) const =0 |
Gets the dimensions of the string using the currently selected font. More... | |
Page and document start/end functions | |
virtual bool | StartDoc (const wxString &message) |
Begin a new document (relevant only for printing / pdf etc.) If there is a progress dialog, message will be shown. More... | |
virtual void | EndDoc () |
Done with that document (relevant only for printing / pdf etc.) More... | |
virtual void | StartPage (wxDouble width=0, wxDouble height=0) |
Opens a new page (relevant only for printing / pdf etc.) with the given size in points. More... | |
virtual void | EndPage () |
Ends the current page (relevant only for printing / pdf etc.) More... | |
Bitmap functions | |
virtual wxGraphicsBitmap | CreateBitmap (const wxBitmap &bitmap)=0 |
Creates wxGraphicsBitmap from an existing wxBitmap. More... | |
virtual wxGraphicsBitmap | CreateBitmapFromImage (const wxImage &image) |
Creates wxGraphicsBitmap from an existing wxImage. More... | |
virtual wxGraphicsBitmap | CreateSubBitmap (const wxGraphicsBitmap &bitmap, wxDouble x, wxDouble y, wxDouble w, wxDouble h)=0 |
Extracts a sub-bitmap from an existing bitmap. More... | |
Modifying the state | |
virtual void | BeginLayer (wxDouble opacity)=0 |
All rendering will be done into a fully transparent temporary context. More... | |
virtual void | EndLayer ()=0 |
Composites back the drawings into the context with the opacity given at the BeginLayer() call. More... | |
virtual void | PushState ()=0 |
Push the current state (like transformations, clipping region and quality settings) of the context on a stack. More... | |
virtual void | PopState ()=0 |
Sets current state of the context to the state saved by a preceding call to PushState() and removes that state from the stack of saved states. More... | |
virtual void | Flush () |
Make sure that the current content of this context is immediately visible. More... | |
Getting/setting parameters | |
virtual void * | GetNativeContext ()=0 |
Returns the native context (CGContextRef for Core Graphics, Graphics pointer for GDIPlus and cairo_t pointer for cairo). More... | |
virtual bool | SetAntialiasMode (wxAntialiasMode antialias)=0 |
Sets the antialiasing mode, returns true if it supported. More... | |
virtual wxAntialiasMode | GetAntialiasMode () const |
Returns the current shape antialiasing mode. More... | |
virtual bool | SetInterpolationQuality (wxInterpolationQuality interpolation)=0 |
Sets the interpolation quality, returns true if it is supported. More... | |
virtual wxInterpolationQuality | GetInterpolationQuality () const |
Returns the current interpolation quality. More... | |
virtual bool | SetCompositionMode (wxCompositionMode op)=0 |
Sets the compositing operator, returns true if it supported. More... | |
virtual wxCompositionMode | GetCompositionMode () const |
Returns the current compositing operator. More... | |
void | GetSize (wxDouble *width, wxDouble *height) const |
Returns the size of the graphics context in device coordinates. More... | |
virtual void | GetDPI (wxDouble *dpiX, wxDouble *dpiY) const |
Returns the resolution of the graphics context in device points per inch. More... | |
wxWindow * | GetWindow () const |
Returns the associated window if any. More... | |
Offset management | |
virtual bool | ShouldOffset () const |
Helper to determine if a 0.5 offset should be applied for the drawing operation. More... | |
virtual void | EnableOffset (bool enable=true) |
Indicates whether the context should try to offset for pixel boundaries. More... | |
void | DisableOffset () |
Helper to determine if a 0.5 offset should be applied for the drawing operation. More... | |
bool | OffsetEnabled () const |
Helper to determine if a 0.5 offset should be applied for the drawing operation. More... | |
wxSize | FromDIP (const wxSize &sz) const |
Convert DPI-independent pixel values to the value in pixels appropriate for the graphics context. More... | |
wxPoint | FromDIP (const wxPoint &pt) const |
This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts. More... | |
int | FromDIP (int d) const |
Convert DPI-independent value in pixels to the value in pixels appropriate for the graphics context. More... | |
wxSize | ToDIP (const wxSize &sz) const |
Convert pixel values of the current graphics context to DPI-independent pixel values. More... | |
wxPoint | ToDIP (const wxPoint &pt) const |
This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts. More... | |
int | ToDIP (int d) const |
Convert pixel values of the current graphics context to DPI-independent pixel values. More... | |
Public Member Functions inherited from wxGraphicsObject | |
wxGraphicsRenderer * | GetRenderer () const |
Returns the renderer that was used to create this instance, or nullptr if it has not been initialized yet. More... | |
bool | IsNull () const |
Public Member Functions inherited from wxObject | |
wxObject () | |
Default ctor; initializes to nullptr the internal reference data. More... | |
wxObject (const wxObject &other) | |
Copy ctor. More... | |
virtual | ~wxObject () |
Destructor. More... | |
virtual wxClassInfo * | GetClassInfo () const |
This virtual function is redefined for every class that requires run-time type information, when using the wxDECLARE_CLASS macro (or similar). More... | |
wxObjectRefData * | GetRefData () const |
Returns the wxObject::m_refData pointer, i.e. the data referenced by this object. More... | |
bool | IsKindOf (const wxClassInfo *info) const |
Determines whether this class is a subclass of (or the same class as) the given class. More... | |
bool | IsSameAs (const wxObject &obj) const |
Returns true if this object has the same data pointer as obj. More... | |
void | Ref (const wxObject &clone) |
Makes this object refer to the data in clone. More... | |
void | SetRefData (wxObjectRefData *data) |
Sets the wxObject::m_refData pointer. More... | |
void | UnRef () |
Decrements the reference count in the associated data, and if it is zero, deletes the data. More... | |
void | UnShare () |
This is the same of AllocExclusive() but this method is public. More... | |
void | operator delete (void *buf) |
The delete operator is defined for debugging versions of the library only, when the identifier __WXDEBUG__ is defined. More... | |
void * | operator new (size_t size, const wxString &filename=nullptr, int lineNum=0) |
The new operator is defined for debugging versions of the library only, when the identifier __WXDEBUG__ is defined. More... | |
Static Public Member Functions | |
Creating a context | |
static wxGraphicsContext * | Create (wxWindow *window) |
Creates a wxGraphicsContext from a wxWindow. More... | |
static wxGraphicsContext * | Create (const wxWindowDC &windowDC) |
Creates a wxGraphicsContext from a wxWindowDC. More... | |
static wxGraphicsContext * | Create (const wxMemoryDC &memoryDC) |
Creates a wxGraphicsContext from a wxMemoryDC. More... | |
static wxGraphicsContext * | Create (const wxPrinterDC &printerDC) |
Creates a wxGraphicsContext from a wxPrinterDC. More... | |
static wxGraphicsContext * | Create (const wxEnhMetaFileDC &metaFileDC) |
Creates a wxGraphicsContext from a wxEnhMetaFileDC. More... | |
static wxGraphicsContext * | CreateFromUnknownDC (wxDC &dc) |
Creates a wxGraphicsContext from a DC of unknown specific type. More... | |
static wxGraphicsContext * | Create (wxImage &image) |
Creates a wxGraphicsContext associated with a wxImage. More... | |
static wxGraphicsContext * | CreateFromNative (void *context) |
Creates a wxGraphicsContext from a native context. More... | |
static wxGraphicsContext * | CreateFromNativeWindow (void *window) |
Creates a wxGraphicsContext from a native window. More... | |
static wxGraphicsContext * | CreateFromNativeHDC (WXHDC dc) |
Creates a wxGraphicsContext from a native DC handle. More... | |
static wxGraphicsContext * | Create () |
Create a lightweight context that can be used only for measuring text. More... | |
Additional Inherited Members | |
Protected Member Functions inherited from wxObject | |
void | AllocExclusive () |
Ensure that this object's data is not shared with any other object. More... | |
virtual wxObjectRefData * | CreateRefData () const |
Creates a new instance of the wxObjectRefData-derived class specific to this object and returns it. More... | |
virtual wxObjectRefData * | CloneRefData (const wxObjectRefData *data) const |
Creates a new instance of the wxObjectRefData-derived class specific to this object and initializes it copying data. More... | |
Protected Attributes inherited from wxObject | |
wxObjectRefData * | m_refData |
Pointer to an object which is the object's reference-counted data. More... | |
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All rendering will be done into a fully transparent temporary context.
Layers can be nested by making balanced calls to BeginLayer()/EndLayer().
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Sets the clipping region to the intersection of the given region and the previously set clipping region.
The clipping region is an area to which drawing is restricted.
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This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.
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Concatenates the passed in transform with the current transform of this context.
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Create a lightweight context that can be used only for measuring text.
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Creates a wxGraphicsContext from a wxEnhMetaFileDC.
This function, as wxEnhMetaFileDC class itself, is only available only under MSW.
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Creates a wxGraphicsContext from a wxMemoryDC.
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Creates a wxGraphicsContext from a wxPrinterDC.
Under GTK+, this will only work when using the GtkPrint printing backend which is available since GTK+ 2.10.
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Creates a wxGraphicsContext from a wxWindowDC.
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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 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.
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Creates a wxGraphicsContext from a wxWindow.
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Creates wxGraphicsBitmap from an existing wxBitmap.
Returns an invalid wxNullGraphicsBitmap on failure.
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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.
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Creates a native brush from a wxBrush.
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Creates a native graphics font from a wxFont and a text colour.
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Creates a font object with the specified attributes.
The use of overload taking wxFont is preferred, see wxGraphicsRenderer::CreateFont() for more details.
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Creates a wxGraphicsContext from a native context.
This native context must be a CGContextRef for Core Graphics, a Graphics pointer for GDIPlus, or a cairo_t pointer for cairo.
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Creates a wxGraphicsContext from a native window.
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Creates a wxGraphicsContext from a DC of unknown specific type.
Creates a wxGraphicsContext if dc is a supported type (i.e. has a corresponding Create() method, e.g. wxWindowDC or wxMemoryDC). Returns nullptr if the DC is unsupported.
This method is only useful as a helper in generic code that operates with wxDC and doesn't known its exact type. Use Create() instead if you know that the DC is e.g. wxWindowDC.
wxGraphicsBrush wxGraphicsContext::CreateLinearGradientBrush | ( | wxDouble | x1, |
wxDouble | y1, | ||
wxDouble | x2, | ||
wxDouble | y2, | ||
const wxColour & | c1, | ||
const wxColour & | c2, | ||
const wxGraphicsMatrix & | matrix = wxNullGraphicsMatrix |
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) | const |
Creates a native brush with a linear gradient.
The brush starts at (x1, y1) and ends at (x2, y2). Either just the start and end gradient colours (c1 and c2) or full set of gradient stops can be specified.
The version taking wxGraphicsGradientStops is new in wxWidgets 2.9.1.
The matrix parameter was added in wxWidgets 3.1.3
wxGraphicsBrush wxGraphicsContext::CreateLinearGradientBrush | ( | wxDouble | x1, |
wxDouble | y1, | ||
wxDouble | x2, | ||
wxDouble | y2, | ||
const wxGraphicsGradientStops & | stops, | ||
const wxGraphicsMatrix & | matrix = wxNullGraphicsMatrix |
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) | const |
This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.
wxGraphicsMatrix wxGraphicsContext::CreateMatrix | ( | const wxAffineMatrix2DBase & | mat | ) | const |
Creates a native affine transformation matrix from the passed generic one.
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Creates a native affine transformation matrix from the passed in values.
The default parameters result in an identity matrix.
wxGraphicsPath wxGraphicsContext::CreatePath | ( | ) | const |
Creates a native graphics path which is initially empty.
wxGraphicsPen wxGraphicsContext::CreatePen | ( | const wxGraphicsPenInfo & | info | ) | const |
Creates a native pen from a wxGraphicsPenInfo.
wxGraphicsPen wxGraphicsContext::CreatePen | ( | const wxPen & | pen | ) | const |
Creates a native pen from a wxPen.
Prefer to use the overload taking wxGraphicsPenInfo unless you already have a wxPen as constructing one only to pass it to this method is wasteful.
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Creates a native brush with a radial gradient.
The brush originates at (startX, startY) and ends on a circle around (endX, endY) with the given radius.
The gradient may be specified either by its start and end colours oColor and cColor or by a full set of gradient stops.
The version taking wxGraphicsGradientStops is new in wxWidgets 2.9.1.
The ability to apply a transformation matrix to the gradient was added in 3.1.3
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This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.
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Extracts a sub-bitmap from an existing bitmap.
void wxGraphicsContext::DisableOffset | ( | ) |
Helper to determine if a 0.5 offset should be applied for the drawing operation.
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This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.
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Draws the bitmap.
In case of a mono bitmap, this is treated as a mask and the current brushed is used for filling.
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Draws an ellipse.
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Draws the icon.
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Draws a polygon.
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Draws the path by first filling and then stroking.
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Draws a rectangle.
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Draws a rounded rectangle.
Draws text at the defined position.
void wxGraphicsContext::DrawText | ( | const wxString & | str, |
wxDouble | x, | ||
wxDouble | y, | ||
const wxGraphicsBrush & | backgroundBrush | ||
) |
Draws text at the defined position.
str | The text to draw. |
x | The x coordinate position to draw the text at. |
y | The y coordinate position to draw the text at. |
backgroundBrush | Brush to fill the text with. |
Draws text at the defined position.
str | The text to draw. |
x | The x coordinate position to draw the text at. |
y | The y coordinate position to draw the text at. |
angle | The angle, in radians, relative to the (default) horizontal direction to draw the string. |
void wxGraphicsContext::DrawText | ( | const wxString & | str, |
wxDouble | x, | ||
wxDouble | y, | ||
wxDouble | angle, | ||
const wxGraphicsBrush & | backgroundBrush | ||
) |
Draws text at the defined position.
str | The text to draw. |
x | The x coordinate position to draw the text at. |
y | The y coordinate position to draw the text at. |
angle | The angle, in radians, relative to the (default) horizontal direction to draw the string. |
backgroundBrush | Brush to fill the text with. |
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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.
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Done with that document (relevant only for printing / pdf etc.)
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Composites back the drawings into the context with the opacity given at the BeginLayer() call.
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Ends the current page (relevant only for printing / pdf etc.)
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Fills the path with the current brush.
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Make sure that the current content of this context is immediately visible.
This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.
Convert DPI-independent pixel values to the value in pixels appropriate for the graphics context.
See wxWindow::FromDIP(const wxSize& sz) and wxDC::FromDIP(const wxSize& sz) for more info about converting device independent pixel values.
int wxGraphicsContext::FromDIP | ( | int | d | ) | const |
Convert DPI-independent value in pixels to the value in pixels appropriate for the graphics context.
This is the same as FromDIP(const wxSize& sz) overload, but assumes that the resolution is the same in horizontal and vertical directions.
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Returns the current shape antialiasing mode.
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Returns bounding box of the current clipping region.
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Returns the current compositing operator.
Returns the resolution of the graphics context in device points per inch.
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Returns the current interpolation quality.
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Returns the native context (CGContextRef for Core Graphics, Graphics pointer for GDIPlus and cairo_t pointer for cairo).
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Fills the widths array with the widths from the beginning of text to the corresponding character of text.
Returns the size of the graphics context in device coordinates.
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Gets the dimensions of the string using the currently selected font.
text | The text string to measure. |
width | Variable to store the total calculated width of the text. |
height | Variable to store the total calculated height of the text. |
descent | Variable to store the dimension from the baseline of the font to the bottom of the descender. |
externalLeading | Any extra vertical space added to the font by the font designer (usually is zero). |
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Gets the current transformation matrix of this context.
wxWindow* wxGraphicsContext::GetWindow | ( | ) | const |
Returns the associated window if any.
If this context was created using Create() overload taking wxWindow or wxWindowDC, this method returns the corresponding window. Otherwise returns nullptr.
bool wxGraphicsContext::OffsetEnabled | ( | ) | const |
Helper to determine if a 0.5 offset should be applied for the drawing operation.
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Sets current state of the context to the state saved by a preceding call to PushState() and removes that state from the stack of saved states.
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Push the current state (like transformations, clipping region and quality settings) of the context on a stack.
Multiple balanced calls to PushState() and PopState() can be nested.
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Resets the clipping to original shape.
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Rotates the current transformation matrix (in radians).
Scales the current transformation matrix.
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Sets the antialiasing mode, returns true if it supported.
void wxGraphicsContext::SetBrush | ( | const wxBrush & | brush | ) |
Sets the brush for filling paths.
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Sets the brush for filling paths.
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Sets the compositing operator, returns true if it supported.
Sets the font for drawing text.
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Sets the font for drawing text.
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Sets the interpolation quality, returns true if it is supported.
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Sets the pen used for stroking.
void wxGraphicsContext::SetPen | ( | const wxPen & | pen | ) |
Sets the pen used for stroking.
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Sets the current transformation matrix of this context.
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Helper to determine if a 0.5 offset should be applied for the drawing operation.
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Begin a new document (relevant only for printing / pdf etc.) If there is a progress dialog, message will be shown.
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.)
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Strokes a single line.
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Stroke disconnected lines from begin to end points, fastest method available for this purpose.
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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.
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Strokes along a path with the current pen.
This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.
Convert pixel values of the current graphics context to DPI-independent pixel values.
See wxWindow::ToDIP(const wxSize& sz) and wxDC::ToDIP(const wxSize& sz) for more info about converting device independent pixel values.
int wxGraphicsContext::ToDIP | ( | int | d | ) | const |
Convert pixel values of the current graphics context to DPI-independent pixel values.
This is the same as ToDIP(const wxSize& sz) overload, but assumes that the resolution is the same in horizontal and vertical directions.