Cairo::Pattern Class Reference

Cairo::Pattern is the paint with which cairo draws. More...

#include <cairomm/pattern.h>

Inheritance diagram for Cairo::Pattern:

Public Types
typedef cairo_pattern_t	cobject

Public Member Functions
	Pattern (cairo_pattern_t*cobject, bool has_reference=false)
	Create a C++ wrapper for the C instance. More...
	Pattern (const Pattern&)=delete
Pattern&	operator= (const Pattern&)=delete
virtual	~Pattern ()
void	set_matrix (const Matrix& matrix)
	Sets the pattern's transformation matrix to . More...
void	get_matrix (Matrix& matrix) const
	Returns the pattern's transformation matrix. More...
Matrix	get_matrix () const
	Returns the pattern's transformation matrix. More...
void	set_matrix (const cairo_matrix_t& matrix)
void	get_matrix (cairo_matrix_t& matrix) const
PatternType	get_type () const
	Returns the type of the pattern. More...
void	set_extend (Extend extend)
	Sets the mode to be used for drawing outside the area of a pattern. More...
Extend	get_extend () const
	Gets the current extend mode See Cairo::Extend for details on the semantics of each extend strategy. More...
cobject*	cobj ()
const cobject*	cobj () const
void	reference () const
void	unreference () const

Protected Member Functions
	Pattern ()

Protected Attributes
cobject*	m_cobject

Detailed Description

Cairo::Pattern is the paint with which cairo draws.

The primary use of patterns is as the source for all cairo drawing operations, although they can also be used as masks, that is, as the brush too.

This is a reference-counted object that should be used via Cairo::RefPtr.

Member Typedef Documentation

typedef cairo_pattern_t Cairo::Pattern::cobject

Constructor & Destructor Documentation

Cairo::Pattern::Pattern ( cairo_pattern_t *  cobject, bool  has_reference = false  )

explicit

Create a C++ wrapper for the C instance.

This C++ instance should then be given to a RefPtr.

Parameters

cobject	The C instance.
has_reference	Whether we already have a reference. Otherwise, the constructor will take an extra reference.

Cairo::Pattern::Pattern ( const Pattern&  )

delete

virtual Cairo::Pattern::~Pattern ( )

virtual

Cairo::Pattern::Pattern ( )

protected

Member Function Documentation

cobject* Cairo::Pattern::cobj ( )

inline

const cobject* Cairo::Pattern::cobj ( ) const

inline

Extend Cairo::Pattern::get_extend

(

)

const

Gets the current extend mode See Cairo::Extend for details on the semantics of each extend strategy.

Since

1.12

void Cairo::Pattern::get_matrix

(

Matrix&

matrix

)

const

Returns the pattern's transformation matrix.

Matrix Cairo::Pattern::get_matrix

(

)

const

Returns the pattern's transformation matrix.

Since

1.8

void Cairo::Pattern::get_matrix

(

cairo_matrix_t&

matrix

)

const

PatternType Cairo::Pattern::get_type

(

)

const

Returns the type of the pattern.

Since

1.2

Pattern& Cairo::Pattern::operator= ( const Pattern&  )

delete

void Cairo::Pattern::reference

(

)

const

void Cairo::Pattern::set_extend

(

Extend

extend

)

Sets the mode to be used for drawing outside the area of a pattern.

See Cairo::Extend for details on the semantics of each extend strategy.

The default extend mode is Cairo::EXTEND_NONE for surface patterns and Cairo::EXTEND_PAD for gradient patterns.

Parameters

Cairo::Extend

describing how the area outsize of the pattern will be drawn

Since

1.12

void Cairo::Pattern::set_matrix

(

const Matrix&

matrix

)

Sets the pattern's transformation matrix to .

This matrix is a transformation from user space to pattern space.

When a pattern is first created it always has the identity matrix for its transformation matrix, which means that pattern space is initially identical to user space.

Important: Please note that the direction of this transformation matrix is from user space to pattern space. This means that if you imagine the flow from a pattern to user space (and on to device space), then coordinates in that flow will be transformed by the inverse of the pattern matrix.

For example, if you want to make a pattern appear twice as large as it does by default the correct code to use is:

pattern->set_matrix(scaling_matrix(0.5, 0.5));

Meanwhile, using values of 2.0 rather than 0.5 in the code above would cause the pattern to appear at half of its default size.

Also, please note the discussion of the user-space locking semantics of set_source().

void Cairo::Pattern::set_matrix

(

const cairo_matrix_t&

matrix

)

void Cairo::Pattern::unreference

(

)

const

Member Data Documentation

cobject* Cairo::Pattern::m_cobject

protected

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The documentation for this class was generated from the following file:

• cairomm/pattern.h