cairomm: Cairo::Pattern Class Reference

cairomm 1.0

Public Types | Public Member Functions | Protected Member Functions | Protected Attributes | List of all members
Cairo::Pattern Class Reference

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

Inheritance diagram for Cairo::Pattern:
[legend]

## 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

## ◆ cobject

typedef cairo_pattern_t Cairo::Pattern::cobject

## Constructor & Destructor Documentation

## ◆ Pattern() [1/3]

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.

## ◆ Pattern() [2/3]

Cairo::Pattern::Pattern | ( | const Pattern& |  | ) |
| delete

## ◆ ~Pattern()

virtual Cairo::Pattern::~Pattern | ( |  | ) |
| virtual

## ◆ Pattern() [3/3]

Cairo::Pattern::Pattern | ( |  | ) |
| protected

## Member Function Documentation

## ◆ cobj() [1/2]

cobject* Cairo::Pattern::cobj | ( |  | ) |
| inline

## ◆ cobj() [2/2]

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

## ◆ get_extend()

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

## ◆ get_matrix() [1/3]

void Cairo::Pattern::get_matrix | ( | Matrix& | matrix | ) | const

Returns the pattern's transformation matrix.

## ◆ get_matrix() [2/3]

Matrix Cairo::Pattern::get_matrix | ( |  | ) | const

Returns the pattern's transformation matrix.

Since
  1.8

## ◆ get_matrix() [3/3]

void Cairo::Pattern::get_matrix | ( | cairo_matrix_t& | matrix | ) | const

## ◆ get_type()

PatternType Cairo::Pattern::get_type | ( |  | ) | const

Returns the type of the pattern.

Since
  1.2

## ◆ operator=()

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

## ◆ reference()

void Cairo::Pattern::reference | ( |  | ) | const

## ◆ set_extend()

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

## ◆ set_matrix() [1/2]

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().

## ◆ set_matrix() [2/2]

void Cairo::Pattern::set_matrix | ( | const cairo_matrix_t& | matrix | ) |

## ◆ unreference()

void Cairo::Pattern::unreference | ( |  | ) | const

## Member Data Documentation

## ◆ m_cobject

cobject* Cairo::Pattern::m_cobject
| protected

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

- cairomm/pattern.h