Cairo::RadialGradient Class Reference

#include <cairomm/pattern.h>

Inheritance diagram for Cairo::RadialGradient:

Public Member Functions
	RadialGradient (cairo_pattern_t *cobject, bool has_reference=false)
	Create a C++ wrapper for the C instance. More...
void	get_radial_circles (double & x0, double & y0, double & r0, double & x1, double & y1, double & r1) const
	Gets the gradient endpoint circles for a radial gradient, each specified as a center coordinate and a radius. More...
	~RadialGradient () override
Public Member Functions inherited from Cairo::Gradient
	Gradient (cairo_pattern_t *cobject, bool has_reference=false)
	Create a C++ wrapper for the C instance. More...
	~Gradient () override
void	add_color_stop_rgb (double offset, double red, double green, double blue)
	Adds an opaque color stop to a gradient pattern. More...
void	add_color_stop_rgba (double offset, double red, double green, double blue, double alpha)
	Adds a translucent color stop to a gradient pattern. More...
std::vector< ColorStop >	get_color_stops () const
	Gets the color stops and offsets for this Gradient. More...
Public Member Functions inherited from Cairo::Pattern
	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 @matrix. 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...
Type	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

Static Public Member Functions
static RefPtr< RadialGradient >	create (double cx0, double cy0, double radius0, double cx1, double cy1, double radius1)
	Creates a new radial gradient #cairo_pattern_t between the two circles defined by (cx0, cy0, radius0) and (cx1, cy1, radius1). More...

Protected Member Functions
	RadialGradient (double cx0, double cy0, double radius0, double cx1, double cy1, double radius1)
Protected Member Functions inherited from Cairo::Gradient
	Gradient ()
Protected Member Functions inherited from Cairo::Pattern
	Pattern ()

Additional Inherited Members
Public Types inherited from Cairo::Pattern
enum class	Type {   SOLID = CAIRO_PATTERN_TYPE_SOLID ,   SURFACE = CAIRO_PATTERN_TYPE_SURFACE ,   LINEAR = CAIRO_PATTERN_TYPE_LINEAR ,   RADIAL = CAIRO_PATTERN_TYPE_RADIAL }
	Type is used to describe the type of a given pattern. More...
enum class	Extend {   NONE = CAIRO_EXTEND_NONE ,   REPEAT = CAIRO_EXTEND_REPEAT ,   REFLECT = CAIRO_EXTEND_REFLECT ,   PAD = CAIRO_EXTEND_PAD }
	Cairo::Extend is used to describe how pattern color/alpha will be determined for areas "outside" the pattern's natural area, (for example, outside the surface bounds or outside the gradient geometry). More...
typedef cairo_pattern_t	cobject
Protected Attributes inherited from Cairo::Pattern
cobject *	m_cobject

Constructor & Destructor Documentation

RadialGradient() [1/2]

Cairo::RadialGradient::RadialGradient ( double  cx0, double  cy0, double  radius0, double  cx1, double  cy1, double  radius1  )

protected

RadialGradient() [2/2]

Cairo::RadialGradient::RadialGradient ( 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.

~RadialGradient()

Cairo::RadialGradient::~RadialGradient ( )

override

Member Function Documentation

create()

static RefPtr<RadialGradient> Cairo::RadialGradient::create ( double  cx0, double  cy0, double  radius0, double  cx1, double  cy1, double  radius1  )

static

Creates a new radial gradient #cairo_pattern_t between the two circles defined by (cx0, cy0, radius0) and (cx1, cy1, radius1).

Before using the gradient pattern, a number of color stops should be defined using Cairo::Gradient::add_color_stop_rgb() or Cairo::Gradient::add_color_stop_rgba().

Note

The coordinates here are in pattern space. For a new pattern, pattern space is identical to user space, but the relationship between the spaces can be changed with Cairo::Pattern::set_matrix().

Parameters

cx0	x coordinate for the center of the start circle
cy0	y coordinate for the center of the start circle
radius0	radius of the start circle
cx1	x coordinate for the center of the end circle
cy1	y coordinate for the center of the end circle
radius1	radius of the end circle

get_radial_circles()

void Cairo::RadialGradient::get_radial_circles	(	double &	x0,
		double &	y0,
		double &	r0,
		double &	x1,
		double &	y1,
		double &	r1
	)		const

Gets the gradient endpoint circles for a radial gradient, each specified as a center coordinate and a radius.

Parameters

x0	return value for the x coordinate of the center of the first (inner) circle
y0	return value for the y coordinate of the center of the first (inner) circle
r0	return value for the radius of the first (inner) circle
x1	return value for the x coordinate of the center of the second (outer) circle
y1	return value for the y coordinate of the center of the second (outer) circle
r1	return value for the radius of the second (outer) circle

Since

1.4

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

• cairomm/pattern.h