cairomm  1.16.2
Public Member Functions | Static Public Member Functions | Protected Member Functions | List of all members
Cairo::RadialGradient Class Reference

#include <cairomm/pattern.h>

Inheritance diagram for Cairo::RadialGradient:
Inheritance graph
[legend]

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< ColorStopget_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
 
Patternoperator= (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...
 
cobjectcobj ()
 
const cobjectcobj () const
 
void reference () const
 
void unreference () const
 

Static Public Member Functions

static RefPtr< RadialGradientcreate (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
cobjectm_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
cobjectThe C instance.
has_referenceWhether 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
cx0x coordinate for the center of the start circle
cy0y coordinate for the center of the start circle
radius0radius of the start circle
cx1x coordinate for the center of the end circle
cy1y coordinate for the center of the end circle
radius1radius 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
x0return value for the x coordinate of the center of the first (inner) circle
y0return value for the y coordinate of the center of the first (inner) circle
r0return value for the radius of the first (inner) circle
x1return value for the x coordinate of the center of the second (outer) circle
y1return value for the y coordinate of the center of the second (outer) circle
r1return value for the radius of the second (outer) circle
Since
1.4

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