Pattern

cairo_pattern_t 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.

A cairo pattern is created by using one of the many constructors, of the form Pattern.createType

or implicitly through cairo_set_source_type() functions.

class Pattern {}

Constructors

this
this(cairo_pattern_t* cairo_pattern)

Sets our main struct and passes it to the parent class

Members

Functions

addColorStopRgb
void addColorStopRgb(double offset, double red, double green, double blue)

Adds an opaque color stop to a gradient pattern. The offset specifies the location along the gradient's control vector. For example, a linear gradient's control vector is from (x0,y0) to (x1,y1) while a radial gradient's control vector is from any point on the start circle to the corresponding point on the end circle. The color is specified in the same way as in cairo_set_source_rgb(). If two (or more) stops are specified with identical offset values, they will be sorted according to the order in which the stops are added, (stops added earlier will compare less than stops added later). This can be useful for reliably making sharp color transitions instead of the typical blend. Note: If the pattern is not a gradient pattern, (eg. a linear or radial pattern), then the pattern will be put into an error status with a status of CAIRO_STATUS_PATTERN_TYPE_MISMATCH. Since 1.0

addColorStopRgba
void addColorStopRgba(double offset, double red, double green, double blue, double alpha)

Adds a translucent color stop to a gradient pattern. The offset specifies the location along the gradient's control vector. For example, a linear gradient's control vector is from (x0,y0) to (x1,y1) while a radial gradient's control vector is from any point on the start circle to the corresponding point on the end circle. The color is specified in the same way as in cairo_set_source_rgba(). If two (or more) stops are specified with identical offset values, they will be sorted according to the order in which the stops are added, (stops added earlier will compare less than stops added later). This can be useful for reliably making sharp color transitions instead of the typical blend. Note: If the pattern is not a gradient pattern, (eg. a linear or radial pattern), then the pattern will be put into an error status with a status of CAIRO_STATUS_PATTERN_TYPE_MISMATCH. Since 1.0

destroy
void destroy()

Decreases the reference count on pattern by one. If the result is zero, then pattern and all associated resources are freed. See Pattern.reference. Since 1.0

getColorStopCount
cairo_status_t getColorStopCount(out int count)

Gets the number of color stops specified in the given gradient pattern. Since 1.4

getColorStopRgba
cairo_status_t getColorStopRgba(int index, out double offset, out double red, out double green, out double blue, out double alpha)

Gets the color and offset information at the given index for a gradient pattern. Values of index are 0 to 1 less than the number returned by Pattern.getColorStopCount. Since 1.4

getExtend
cairo_extend_t getExtend()

Gets the current extend mode for a pattern. See cairo_extend_t for details on the semantics of each extend strategy. Since 1.0

getFilter
cairo_filter_t getFilter()

Gets the current filter for a pattern. See cairo_filter_t for details on each filter. Since 1.0

getLinearPoints
cairo_status_t getLinearPoints(out double x0, out double y0, out double x1, out double y1)

Gets the gradient endpoints for a linear gradient. Since 1.4

getMatrix
void getMatrix(Matrix matrix)

Stores the pattern's transformation matrix into matrix. Since 1.0

getPatternStruct
cairo_pattern_t* getPatternStruct()

Get the main Gtk struct

getRadialCircles
cairo_status_t getRadialCircles(out double x0, out double y0, out double r0, out double x1, out double y1, out double r1)

Gets the gradient endpoint circles for a radial gradient, each specified as a center coordinate and a radius. Since 1.4

getReferenceCount
uint getReferenceCount()

Returns the current reference count of pattern. Since 1.4

getRgba
cairo_status_t getRgba(out double red, out double green, out double blue, out double alpha)

Gets the solid color for a solid color pattern. Since 1.4

getStruct
void* getStruct()

the main Gtk struct as a void*

getSurface
cairo_status_t getSurface(out Surface surface)

Gets the surface of a surface pattern. The reference returned in surface is owned by the pattern; the caller should call Surface.reference if the surface is to be retained. Since 1.4

getType
cairo_pattern_type_t getType()

This function returns the type a pattern. See cairo_pattern_type_t for available types. Since 1.2

getUserData
void* getUserData(cairo_user_data_key_t* key)

Return user data previously attached to pattern using the specified key. If no user data has been attached with the given key this function returns NULL. Since 1.4

reference
Pattern reference()

Increases the reference count on pattern by one. This prevents pattern from being destroyed until a matching call to Pattern.destroy is made. The number of references to a cairo_pattern_t can be get using Pattern.getReferenceCount. Since 1.0

setExtend
void setExtend(cairo_extend_t extend)

Sets the mode to be used for drawing outside the area of a pattern. See cairo_extend_t 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. Since 1.0

setFilter
void setFilter(cairo_filter_t filter)

Sets the filter to be used for resizing when using this pattern. See cairo_filter_t for details on each filter. * Note that you might want to control filtering even when you do not have an explicit cairo_pattern_t object, (for example when using cairo_set_source_surface()). In these cases, it is convenient to use cairo_get_source() to get access to the pattern that cairo Since 1.0

setMatrix
void setMatrix(Matrix matrix)

Sets the pattern's transformation matrix to matrix. 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 Since 1.0

setUserData
cairo_status_t setUserData(cairo_user_data_key_t* key, void* userData, cairo_destroy_func_t destroy)

Attach user data to pattern. To remove user data from a surface, call this function with the key that was used to set it and NULL for data. Since 1.4

status
cairo_status_t status()

Checks whether an error has previously occurred for this pattern. Since 1.0

Static functions

createForSurface
Pattern createForSurface(Surface surface)

Create a new cairo_pattern_t for the given surface. Since 1.0

createLinear
Pattern createLinear(double x0, double y0, double x1, double y1)

Create a new linear gradient cairo_pattern_t along the line defined by (x0, y0) and (x1, y1). Before using the gradient pattern, a number of color stops should be defined using Pattern.addColorStopRgb or Pattern.addColorStopRgba. 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 Pattern.setMatrix. Since 1.0

createRadial
Pattern createRadial(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). Before using the gradient pattern, a number of color stops should be defined using Pattern.addColorStopRgb or Pattern.addColorStopRgba. 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 Pattern.setMatrix. Since 1.0

createRgb
Pattern createRgb(double red, double green, double blue)

Creates a new cairo_pattern_t corresponding to an opaque color. The color components are floating point numbers in the range 0 to 1. If the values passed in are outside that range, they will be clamped. Since 1.0

createRgba
Pattern createRgba(double red, double green, double blue, double alpha)

Creates a new cairo_pattern_t corresponding to a translucent color. The color components are floating point numbers in the range 0 to 1. If the values passed in are outside that range, they will be clamped. Since 1.0

Variables

cairo_pattern
cairo_pattern_t* cairo_pattern;

the main Gtk struct

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