| patterns | R Documentation |
Functions to define gradient fills and pattern fills.
linearGradient(colours = c("black", "white"),
stops = seq(0, 1, length.out = length(colours)),
x1 = unit(0, "npc"), y1 = unit(0, "npc"),
x2 = unit(1, "npc"), y2 = unit(1, "npc"),
default.units = "npc",
extend = c("pad", "repeat", "reflect", "none"))
radialGradient(colours = c("black", "white"),
stops = seq(0, 1, length.out = length(colours)),
cx1 = unit(.5, "npc"), cy1 = unit(.5, "npc"),
r1 = unit(0, "npc"),
cx2 = unit(.5, "npc"), cy2 = unit(.5, "npc"),
r2 = unit(.5, "npc"),
default.units = "npc",
extend = c("pad", "repeat", "reflect", "none"))
pattern(grob,
x = 0.5, y = 0.5, width = 1, height = 1,
default.units = "npc",
just="centre", hjust=NULL, vjust=NULL,
extend = c("pad", "repeat", "reflect", "none"),
gp = gpar(fill="transparent"))
colours |
Two or more colours for the gradient to transition between. |
stops |
Locations of the gradient colours between the start and end points of the gradient (as a proportion of the distance from the start point to the end point). |
x1, y1, x2, y2 |
The start and end points for a linear gradient. |
default.units |
The coordinate system to use if any location or dimension is specified as just a numeric value. |
extend |
What happens outside the start and end of the gradient (see Details). |
cx1, cy1, r1, cx2, cy2, r2 |
The centre and radius of the start and end circles for a radial gradient. |
grob |
A grob (or a gTree) that will be drawn as the tile in a pattern fill. |
x, y, width, height |
The size of the tile for a pattern fill. |
just, hjust, vjust |
The justification of the tile relative to its location. |
gp |
Default graphical parameter settings for the tile. |
Use these functions to define a gradient fill or pattern fill and
then use the resulting object as the value for fill
in a call to the gpar() function.
The possible values of extend, and their meanings, are:
[pad:] propagate the value of the gradient at its
boundary.
[none:] produce no fill beyond the limits of the
gradient.
[repeat:] repeat the fill.
[reflect:] repeat the fill in reverse.
To create a tiling pattern, provide a simple grob (like a circle),
specify the location and size of the pattern to include the simple
grob, and specify extend="repeat".
A linear gradient or radial gradient or pattern object.
Gradient fills and pattern fills are not supported on all graphics
devices. Where they are not supported, closed shapes will be
rendered with a transparent fill. Where they are supported,
not all values of extend are supported.
Paul Murrell
gpar
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