cairo-Patterns {RGtk2} | R Documentation |
Sources for drawing
cairoPatternAddColorStopRgb(pattern, offset, red, green, blue)
cairoPatternAddColorStopRgba(pattern, offset, red, green, blue, alpha)
cairoPatternGetColorStopCount(pattern)
cairoPatternGetColorStopRgba(pattern, index)
cairoPatternCreateRgb(red, green, blue)
cairoPatternCreateRgba(red, green, blue, alpha)
cairoPatternGetRgba(pattern)
cairoPatternCreateForSurface(surface)
cairoPatternGetSurface(pattern)
cairoPatternCreateLinear(x0, y0, x1, y1)
cairoPatternGetLinearPoints(pattern)
cairoPatternCreateRadial(cx0, cy0, radius0, cx1, cy1, radius1)
cairoPatternGetRadialCircles(pattern)
cairoPatternStatus(pattern)
cairoPatternSetExtend(pattern, extend)
cairoPatternGetExtend(pattern)
cairoPatternSetFilter(pattern, filter)
cairoPatternGetFilter(pattern)
cairoPatternSetMatrix(pattern, matrix)
cairoPatternGetMatrix(pattern, matrix)
cairoPatternGetType(pattern)
cairoPatternSetUserData(pattern, key, user.data)
cairoPatternGetUserData(pattern, key)
cairoPattern(red, green, blue, alpha, surface, x0, y0, x1, y1, cx0, cy0, radius0, cx1, cy1, radius1)
CairoPattern
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 cairo_pattern_create_type() or implicitly through cairo_set_source_type() functions.
CairoPattern
CairoPattern
represents a source when drawing onto a
surface. There are different subtypes of CairoPattern
,
for different types of sources; for example,
cairoPatternCreateRgb
creates a pattern for a solid
opaque color.
Other than various cairo_pattern_create_type()
functions, some of the pattern types can be implicitly created
using various cairo_set_source_type() functions;
for example cairoSetSourceRgb
.
The type of a pattern can be queried with cairoPatternGetType
.
Memory management of CairoPattern
is done with
cairoPatternReference()
and cairoPatternDestroy()
.
cairoPattern
is the result of collapsing the constructors of cairo_pattern_t
(cairoPatternCreateRgb
, cairoPatternCreateRgba
, cairoPatternCreateForSurface
, cairoPatternCreateLinear
, cairoPatternCreateRadial
) and accepts a subset of its arguments matching the required arguments of one of its delegate constructors.
CairoExtend
CairoExtend
is used to describe how the area outside
of a pattern will be drawn.
New entries may be added in future versions.
none
repeat
reflect
CairoFilter
CairoFilter
is used to indicate what filtering should be
applied when reading pixel values from patterns. See
cairoPatternSetSource()
for indicating the desired filter to be
used with a particular pattern.
fast
CAIRO_FILTER_NEAREST
good
CAIRO_FILTER_BILINEAR
best
nearest
bilinear
gaussian
CairoPatternType
CairoPatternType
is used to describe the type of a given pattern.
The type of a pattern is determined by the function used to create
it. The cairoPatternCreateRgb
and cairoPatternCreateRgba
functions create SOLID patterns. The remaining
cairo_pattern_create functions map to pattern types in obvious
ways.
The pattern type can be queried with cairoPatternGetType
Most CairoPattern
functions can be called with a pattern of any
type, (though trying to change the extend or filter for a solid
pattern will have no effect). A notable exception is
cairoPatternAddColorStopRgb
and
cairoPatternAddColorStopRgba
which must only be called with
gradient patterns (either LINEAR or RADIAL). Otherwise the pattern
will be shutdown and put into an error state.
New entries may be added in future versions.
Since 1.2
solid
surface
linear
radial
Derived by RGtkGen from GTK+ documentation
http://www.cairographics.org/manual/cairo-Patterns.html