In coolbutuseless/ggpattern: 'ggplot2' Pattern Geoms
suppressPackageStartupMessages({
library("ggplot2")
library("ggpattern")
require("magick", quietly = TRUE)
})
Introduction to the 'image and 'placeholder' patterns
- The 'image' pattern allows filling a geom with an image from file or URL.
It is an "array" pattern that depends on the suggested package
{magick}.
- The 'placeholder' pattern fetches images from image placeholder sites.
It is an "array" pattern that depends on the suggested package
{magick}
and additionally requires an internet connect.
-
For more info on these patterns see their {gridpattern} documentation:
-
help("grid.pattern_placeholder", package = "gridpattern")
The image pattern - filling a geom with an image from file or URL
This pattern will load an image from a file or URL (pattern_filename)
and display it within the geom.
Because the image will most likely not exactly cover the area of the geom, there
are options to specify how the image is used to fill
the region.
After expanding to cover the area, the image is then clipped to the boundary of the geom.
The files/URLs are loaded with magick::image_read which means that transparent
images and SVGs are supported.
image options
| Aesthetic | Description | Default |
|----------------------------|------------------------------------|-----------|
| pattern_filename | Image filename or URL | '' |
| pattern_type | Image scaling type | 'fit' |
| pattern_scale | Extra scaling | 1 |
| pattern_gravity | Position of image within area | 'center' |
| pattern_filter | Filter to use when scaling | 'lanczos' |
| pattern_alpha | Alpha | NA |
| pattern_aspect_ratio | Override aspect ratio | NA |
| pattern_key_scale_factor | Additional scale factor for legend | 1 |
| pattern_type | Description | pattern_scale | pattern_gravity |
|----------------|---------------------------------------------------------------------------------------------------------------------------------|-----------------|-----------------------------|
| squish | distort the image to cover the bounding box of the region | | |
| fit | scale the image such that either the width or the height of the image fits in the bounding box. | | Yes |
| expand | scale the image beyond the bounding box and crop it such that the image fully covers the width and the height of the region | | |
| none | position a single image in the region without attempting to scale to the bounding box size | Yes | Yes |
| tile | repeat the image to cover the bounding box. | Yes | |
Note: not all combinations of aesthetics are useful e.g. if pattern_type = 'fit' is specified, then
pattern_scale has no effect.
Example Data
These examples use some of the built-in images in the ggpattern package.
#~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# filenames of images
#~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
logo_filename <- system.file("img", "Rlogo.png" , package="png")
magpie_filename <- system.file("img", "magpie.jpg", package="ggpattern")
bug_filename <- system.file("img", "bug.jpg" , package="ggpattern")
seamless1 <- system.file("img", "seamless1.jpg" , package="ggpattern")
seamless2 <- system.file("img", "seamless2.jpg" , package="ggpattern")
seamless3 <- system.file("img", "seamless3.jpg" , package="ggpattern")
#~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# Plotting data
#~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
df1 <- data.frame(
trt = c("a", "b", "c"),
outcome = c(2.3, 1.9, 3.2),
gravity = c('South', 'North', 'West'),
filltype = c('squish', 'fit' , 'expand'),
scale = c(1, 2, 0.5),
filename = c(logo_filename, magpie_filename, bug_filename),
stringsAsFactors = FALSE
)
Table: Example Data
|trt | outcome|gravity |filltype | scale|filename |
|:---|-------:|:-------|:--------|-----:|:------------------------------------------------------|
|a | 2.3|South |squish | 1.0|/usr/local/lib/R/site-library/png/img/Rlogo.png |
|b | 1.9|North |fit | 2.0|/usr/local/lib/R/site-library/ggpattern/img/magpie.jpg |
|c | 3.2|West |expand | 0.5|/usr/local/lib/R/site-library/ggpattern/img/bug.jpg |
Example: pattern = 'image' - No Attempt at filling the area (pattern_type = 'none')
If pattern_type = 'none' then no attempt is made at snugly filling the area.
Instead a single copy of the image is scaled (pattern_scale) and
placed (pattern_gravity) in the geom area.
if (require("magick")) {
ggplot(df1, aes(trt, outcome)) +
geom_col_pattern(
aes(
fill = trt,
pattern_gravity = I(gravity),
pattern_scale = I(scale)
),
pattern = 'image',
pattern_filename = logo_filename,
pattern_type = 'none',
colour = 'black'
) +
theme_bw(15) +
labs(
title = "ggpattern::geom_col_pattern()",
subtitle = "pattern = 'image', pattern_type = 'none'"
) +
theme(legend.key.size = unit(1.5, 'cm')) +
coord_fixed(ratio = 1/2)
}
Example: pattern = 'image' - Covering the area (pattern_type = 'fit', 'squish', 'expand')
In the plot below, 3 different methods are used to cover the area of the geom. From
left-to-right:
pattern_type = 'squish' to force the image to cover the bounding box of the geom.pattern_type = 'fit' to force the image to cover the width (or height) yet still
remain fully visible. pattern_gravity = 'North' floats the image to the top.pattern_type = 'expand`` scales the image (while preserving aspect ratio) such
that the entire geom is covered.pattern_gravity = 'West'` anchors the image
to the left side of the geom.
if (require("magick")) {
ggplot(df1, aes(trt, outcome)) +
geom_col_pattern(
aes(
fill = trt,
pattern_gravity = I(gravity),
pattern_type = I(filltype)
),
pattern = 'image',
colour = 'black',
pattern_filename = logo_filename,
) +
theme_bw(15) +
labs(
title = "ggpattern::geom_col_pattern()",
subtitle = "pattern = 'image'"
) +
# theme(legend.key.size = unit(1.5, 'cm')) +
theme(legend.position = 'none') +
coord_fixed(ratio = 1/2)
}
Example: pattern = 'image' - Tiling (pattern_type = 'tile')
When tiled, the image is replicated in order to cover the entire area of the geom.
In this example, pattern_scale is also applied to the image so that it appears at
different sizes.
if (require("magick")) {
ggplot(df1, aes(trt, outcome)) +
geom_col_pattern(
aes(
fill = trt,
pattern_gravity = I(gravity),
pattern_scale = I(scale)
),
pattern = 'image',
pattern_type = 'tile',
pattern_filename = logo_filename,
colour = 'black'
) +
theme_bw(15) +
labs(
title = "ggpattern::geom_col_pattern()",
subtitle = "pattern = 'image', pattern_type = 'tile'"
) +
# theme(legend.key.size = unit(1.5, 'cm')) +
theme(legend.position = 'none') +
coord_fixed(ratio = 1/2)
}
Example: pattern = 'image' - Tiling with seamless patterns
By choosing a seamlessly tiling image, then a tiled fill will not have visible discontinuities.
if (require("magick")) {
ggplot(mtcars) +
geom_density_pattern(
aes(
x = mpg,
pattern_filename = as.factor(cyl)
),
pattern = 'image',
pattern_type = 'tile'
) +
theme_bw(15) +
theme(legend.key.size = unit(1.5, 'cm')) +
labs(
title = "ggpattern::geom_density_pattern()",
subtitle = "pattern = 'image', pattern_type = 'tile'"
) +
scale_pattern_filename_manual(values = c(`4` = seamless1, `6` = seamless2, `8` = seamless3)) +
coord_fixed(ratio = 80)
}
Example: pattern = 'image' - Tiling with seamless patterns (with scaling)
if (require("magick")) {
ggplot(mtcars) +
geom_density_pattern(
aes(
x = mpg,
pattern_filename = as.factor(cyl)
),
pattern = 'image',
pattern_type = 'tile',
pattern_scale = 0.5
) +
theme_bw(15) +
theme(legend.key.size = unit(2, 'cm')) +
labs(
title = "ggpattern::geom_density_pattern()",
subtitle = "pattern = 'image', pattern_type = 'tile'"
) +
scale_pattern_filename_manual(values = c(`4` = seamless1, `6` = seamless2, `8` = seamless3)) +
coord_fixed(ratio = 80)
}
Example: pattern = 'image' - Tiling with fit to width (of element bounding box)
In a common case, the image to be tiled should be first scaled to
the width of the bar to be tiled and then tiling appears like a vertical stacking.
This is useful for bar charts.
Specify pattern_scale = -1 to fit the width of the geom, and pattern_scale = -2 to
fit the height of the geom.
if (require("magick")) {
ggplot(df1, aes(trt, outcome)) +
geom_col_pattern(
aes(
fill = trt,
pattern_filename = I(filename)
),
pattern = 'image',
pattern_type = 'tile',
pattern_scale = -1,
colour = 'black'
) +
theme_bw(15) +
labs(
title = "ggpattern::geom_col_pattern()",
subtitle = "pattern = 'image', pattern_type = 'tile',\npattern_scale = -1"
) +
theme(legend.position = 'none') +
coord_fixed(ratio = 1)
}
placeholder - Filling with an image placeholder
Array-based patterns allow the user to specify an RGBA that should be displayed
in the geom.
Getting the correct sized image such that it takes up the full space without
being distorted can be a time-consuming task.
The placeholder pattern takes out this drudgery by fetching exactly the correct
sized image to fit the space. These images come from image placeholder sites
which are most often used by web-developers as a stand-in for a final image
while they are developing a new site.
placeholder options
| Aesthetic | Description | Default |
|----------------------------|------------------------------------|-----------|
| pattern_type | Image source | 'bear' |
| pattern_alpha | Alpha | NA |
| pattern_aspect_ratio | Override aspect ratio | NA |
| pattern_key_scale_factor | Additional scale factor for legend | 1 |
placeholder option pattern_type
The following is a list of all the pattern_type values which are valid. If
unspecified or unknown, then ggpattern will use pattern_type = 'bear'.
If you would like only greyscale images, append bw to the name, e.g. to
display only black and white bears use pattern_type = 'bearbw'.
Click the link to see an example of each placeholder generator
- 'kitten' - kitten
- 'picsum' - random picture from picsum
- 'murray' - bill murray
- 'cage' - nicholas cage
- 'bear' - bears
- 'seagal' - steven seagal
- 'placeholder' - placeholder.com
- 'dummy' - image showing dimensions
- 'flickr' - random picture from flickr
- 'beard' - beards
- 'lorempixel' - lorempixel
- 'placeimg' - random pic from placeimg.com
- 'keanu' - Keanu
All placeholder names are available in gridpattern::names_placeholder.
Example Data
df1 <- data.frame(
trt = c("a", "b", "c"),
outcome = c(2.3, 1.9, 3.2),
stringsAsFactors = FALSE
)
Example: pattern = 'placeholder' - pattern_type = 'bear'
if (require("magick")) {
ggplot(df1, aes(trt, outcome)) +
geom_col_pattern(
aes(fill = trt),
pattern = 'placeholder',
pattern_type = 'bear',
colour = 'black'
) +
theme_bw(15) +
labs(
title = "ggpattern::geom_col_pattern()",
subtitle = "pattern='placeholder', pattern_type='bear'"
) +
theme(legend.position = 'none') +
coord_fixed(ratio = 1/2)
}
Example: pattern = 'placeholder' - pattern_type = 'picsum'
if (require("magick")) {
ggplot(mtcars) +
geom_density_pattern(
aes(x = mpg, group = as.factor(cyl)),
pattern = 'placeholder',
pattern_type = 'picsum'
) +
theme_bw(15) +
theme(legend.position = 'none') +
labs(
title = "ggpattern::geom_col_pattern()",
subtitle = "pattern='placeholder', pattern_type='picsum'"
) +
coord_fixed(ratio = 80)
}
Example: pattern = 'placeholder' - pattern_type = 'dummy'
if (require("magick")) {
ggplot(df1, aes(trt, outcome)) +
geom_col_pattern(
aes(fill = trt),
pattern = 'placeholder',
pattern_type = 'dummy',
colour = 'black'
) +
theme_bw(15) +
labs(
title = "ggpattern::geom_col_pattern()",
subtitle = "pattern='placeholder', pattern_type='dummy'"
) +
theme(legend.position = 'none') +
coord_fixed(ratio = 1/2)
}
Resetting the image cache
{gridpattern} stores the images used by the "image" and "placeholder" patterns in a cache.
This is mainly to avoid the risk of re-downloading the same image over and over especially for
the "placeholder" pattern. However, this may cause problems if you re-using the same image filename
but the images in those files are changing.
You may reset this image cache with gridpattern::reset_image_cache().
coolbutuseless/ggpattern documentation built on May 3, 2024, 2:31 a.m.
R Package Documentation
Browse R Packages
We want your feedback!
Note that we can't provide technical support on individual packages. You should contact the package authors for that.
suppressPackageStartupMessages({ library("ggplot2") library("ggpattern") require("magick", quietly = TRUE) })
Introduction to the 'image and 'placeholder' patterns
- The 'image' pattern allows filling a geom with an image from file or URL.
It is an "array" pattern that depends on the suggested package
{magick}. - The 'placeholder' pattern fetches images from image placeholder sites.
It is an "array" pattern that depends on the suggested package
{magick}and additionally requires an internet connect. -
For more info on these patterns see their
{gridpattern}documentation: help("grid.pattern_placeholder", package = "gridpattern")
The image pattern - filling a geom with an image from file or URL
This pattern will load an image from a file or URL (pattern_filename)
and display it within the geom.
Because the image will most likely not exactly cover the area of the geom, there are options to specify how the image is used to fill the region.
After expanding to cover the area, the image is then clipped to the boundary of the geom.
The files/URLs are loaded with magick::image_read which means that transparent
images and SVGs are supported.
image options
| Aesthetic | Description | Default |
|----------------------------|------------------------------------|-----------|
| pattern_filename | Image filename or URL | '' |
| pattern_type | Image scaling type | 'fit' |
| pattern_scale | Extra scaling | 1 |
| pattern_gravity | Position of image within area | 'center' |
| pattern_filter | Filter to use when scaling | 'lanczos' |
| pattern_alpha | Alpha | NA |
| pattern_aspect_ratio | Override aspect ratio | NA |
| pattern_key_scale_factor | Additional scale factor for legend | 1 |
| pattern_type | Description | pattern_scale | pattern_gravity |
|----------------|---------------------------------------------------------------------------------------------------------------------------------|-----------------|-----------------------------|
| squish | distort the image to cover the bounding box of the region | | |
| fit | scale the image such that either the width or the height of the image fits in the bounding box. | | Yes |
| expand | scale the image beyond the bounding box and crop it such that the image fully covers the width and the height of the region | | |
| none | position a single image in the region without attempting to scale to the bounding box size | Yes | Yes |
| tile | repeat the image to cover the bounding box. | Yes | |
Note: not all combinations of aesthetics are useful e.g. if pattern_type = 'fit' is specified, then
pattern_scale has no effect.
Example Data
These examples use some of the built-in images in the ggpattern package.
#~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ # filenames of images #~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ logo_filename <- system.file("img", "Rlogo.png" , package="png") magpie_filename <- system.file("img", "magpie.jpg", package="ggpattern") bug_filename <- system.file("img", "bug.jpg" , package="ggpattern") seamless1 <- system.file("img", "seamless1.jpg" , package="ggpattern") seamless2 <- system.file("img", "seamless2.jpg" , package="ggpattern") seamless3 <- system.file("img", "seamless3.jpg" , package="ggpattern") #~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ # Plotting data #~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ df1 <- data.frame( trt = c("a", "b", "c"), outcome = c(2.3, 1.9, 3.2), gravity = c('South', 'North', 'West'), filltype = c('squish', 'fit' , 'expand'), scale = c(1, 2, 0.5), filename = c(logo_filename, magpie_filename, bug_filename), stringsAsFactors = FALSE )
Table: Example Data
|trt | outcome|gravity |filltype | scale|filename | |:---|-------:|:-------|:--------|-----:|:------------------------------------------------------| |a | 2.3|South |squish | 1.0|/usr/local/lib/R/site-library/png/img/Rlogo.png | |b | 1.9|North |fit | 2.0|/usr/local/lib/R/site-library/ggpattern/img/magpie.jpg | |c | 3.2|West |expand | 0.5|/usr/local/lib/R/site-library/ggpattern/img/bug.jpg |
Example: pattern = 'image' - No Attempt at filling the area (pattern_type = 'none')
If pattern_type = 'none' then no attempt is made at snugly filling the area.
Instead a single copy of the image is scaled (pattern_scale) and
placed (pattern_gravity) in the geom area.
if (require("magick")) { ggplot(df1, aes(trt, outcome)) + geom_col_pattern( aes( fill = trt, pattern_gravity = I(gravity), pattern_scale = I(scale) ), pattern = 'image', pattern_filename = logo_filename, pattern_type = 'none', colour = 'black' ) + theme_bw(15) + labs( title = "ggpattern::geom_col_pattern()", subtitle = "pattern = 'image', pattern_type = 'none'" ) + theme(legend.key.size = unit(1.5, 'cm')) + coord_fixed(ratio = 1/2) }
Example: pattern = 'image' - Covering the area (pattern_type = 'fit', 'squish', 'expand')
In the plot below, 3 different methods are used to cover the area of the geom. From left-to-right:
pattern_type = 'squish'to force the image to cover the bounding box of the geom.pattern_type = 'fit'to force the image to cover the width (or height) yet still remain fully visible.pattern_gravity = 'North'floats the image to the top.pattern_type = 'expand`` scales the image (while preserving aspect ratio) such that the entire geom is covered.pattern_gravity = 'West'` anchors the image to the left side of the geom.
if (require("magick")) { ggplot(df1, aes(trt, outcome)) + geom_col_pattern( aes( fill = trt, pattern_gravity = I(gravity), pattern_type = I(filltype) ), pattern = 'image', colour = 'black', pattern_filename = logo_filename, ) + theme_bw(15) + labs( title = "ggpattern::geom_col_pattern()", subtitle = "pattern = 'image'" ) + # theme(legend.key.size = unit(1.5, 'cm')) + theme(legend.position = 'none') + coord_fixed(ratio = 1/2) }
Example: pattern = 'image' - Tiling (pattern_type = 'tile')
When tiled, the image is replicated in order to cover the entire area of the geom.
In this example, pattern_scale is also applied to the image so that it appears at
different sizes.
if (require("magick")) { ggplot(df1, aes(trt, outcome)) + geom_col_pattern( aes( fill = trt, pattern_gravity = I(gravity), pattern_scale = I(scale) ), pattern = 'image', pattern_type = 'tile', pattern_filename = logo_filename, colour = 'black' ) + theme_bw(15) + labs( title = "ggpattern::geom_col_pattern()", subtitle = "pattern = 'image', pattern_type = 'tile'" ) + # theme(legend.key.size = unit(1.5, 'cm')) + theme(legend.position = 'none') + coord_fixed(ratio = 1/2) }
Example: pattern = 'image' - Tiling with seamless patterns
By choosing a seamlessly tiling image, then a tiled fill will not have visible discontinuities.
if (require("magick")) { ggplot(mtcars) + geom_density_pattern( aes( x = mpg, pattern_filename = as.factor(cyl) ), pattern = 'image', pattern_type = 'tile' ) + theme_bw(15) + theme(legend.key.size = unit(1.5, 'cm')) + labs( title = "ggpattern::geom_density_pattern()", subtitle = "pattern = 'image', pattern_type = 'tile'" ) + scale_pattern_filename_manual(values = c(`4` = seamless1, `6` = seamless2, `8` = seamless3)) + coord_fixed(ratio = 80) }
Example: pattern = 'image' - Tiling with seamless patterns (with scaling)
if (require("magick")) { ggplot(mtcars) + geom_density_pattern( aes( x = mpg, pattern_filename = as.factor(cyl) ), pattern = 'image', pattern_type = 'tile', pattern_scale = 0.5 ) + theme_bw(15) + theme(legend.key.size = unit(2, 'cm')) + labs( title = "ggpattern::geom_density_pattern()", subtitle = "pattern = 'image', pattern_type = 'tile'" ) + scale_pattern_filename_manual(values = c(`4` = seamless1, `6` = seamless2, `8` = seamless3)) + coord_fixed(ratio = 80) }
Example: pattern = 'image' - Tiling with fit to width (of element bounding box)
In a common case, the image to be tiled should be first scaled to the width of the bar to be tiled and then tiling appears like a vertical stacking. This is useful for bar charts.
Specify pattern_scale = -1 to fit the width of the geom, and pattern_scale = -2 to
fit the height of the geom.
if (require("magick")) { ggplot(df1, aes(trt, outcome)) + geom_col_pattern( aes( fill = trt, pattern_filename = I(filename) ), pattern = 'image', pattern_type = 'tile', pattern_scale = -1, colour = 'black' ) + theme_bw(15) + labs( title = "ggpattern::geom_col_pattern()", subtitle = "pattern = 'image', pattern_type = 'tile',\npattern_scale = -1" ) + theme(legend.position = 'none') + coord_fixed(ratio = 1) }
placeholder - Filling with an image placeholder
Array-based patterns allow the user to specify an RGBA that should be displayed in the geom.
Getting the correct sized image such that it takes up the full space without being distorted can be a time-consuming task.
The placeholder pattern takes out this drudgery by fetching exactly the correct sized image to fit the space. These images come from image placeholder sites which are most often used by web-developers as a stand-in for a final image while they are developing a new site.
placeholder options
| Aesthetic | Description | Default |
|----------------------------|------------------------------------|-----------|
| pattern_type | Image source | 'bear' |
| pattern_alpha | Alpha | NA |
| pattern_aspect_ratio | Override aspect ratio | NA |
| pattern_key_scale_factor | Additional scale factor for legend | 1 |
placeholder option pattern_type
The following is a list of all the pattern_type values which are valid. If
unspecified or unknown, then ggpattern will use pattern_type = 'bear'.
If you would like only greyscale images, append bw to the name, e.g. to
display only black and white bears use pattern_type = 'bearbw'.
Click the link to see an example of each placeholder generator
- 'kitten' - kitten
- 'picsum' - random picture from picsum
- 'murray' - bill murray
- 'cage' - nicholas cage
- 'bear' - bears
- 'seagal' - steven seagal
- 'placeholder' - placeholder.com
- 'dummy' - image showing dimensions
- 'flickr' - random picture from flickr
- 'beard' - beards
- 'lorempixel' - lorempixel
- 'placeimg' - random pic from placeimg.com
- 'keanu' - Keanu
All placeholder names are available in gridpattern::names_placeholder.
Example Data
df1 <- data.frame( trt = c("a", "b", "c"), outcome = c(2.3, 1.9, 3.2), stringsAsFactors = FALSE )
Example: pattern = 'placeholder' - pattern_type = 'bear'
if (require("magick")) { ggplot(df1, aes(trt, outcome)) + geom_col_pattern( aes(fill = trt), pattern = 'placeholder', pattern_type = 'bear', colour = 'black' ) + theme_bw(15) + labs( title = "ggpattern::geom_col_pattern()", subtitle = "pattern='placeholder', pattern_type='bear'" ) + theme(legend.position = 'none') + coord_fixed(ratio = 1/2) }
Example: pattern = 'placeholder' - pattern_type = 'picsum'
if (require("magick")) { ggplot(mtcars) + geom_density_pattern( aes(x = mpg, group = as.factor(cyl)), pattern = 'placeholder', pattern_type = 'picsum' ) + theme_bw(15) + theme(legend.position = 'none') + labs( title = "ggpattern::geom_col_pattern()", subtitle = "pattern='placeholder', pattern_type='picsum'" ) + coord_fixed(ratio = 80) }
Example: pattern = 'placeholder' - pattern_type = 'dummy'
if (require("magick")) { ggplot(df1, aes(trt, outcome)) + geom_col_pattern( aes(fill = trt), pattern = 'placeholder', pattern_type = 'dummy', colour = 'black' ) + theme_bw(15) + labs( title = "ggpattern::geom_col_pattern()", subtitle = "pattern='placeholder', pattern_type='dummy'" ) + theme(legend.position = 'none') + coord_fixed(ratio = 1/2) }
Resetting the image cache
{gridpattern} stores the images used by the "image" and "placeholder" patterns in a cache.
This is mainly to avoid the risk of re-downloading the same image over and over especially for
the "placeholder" pattern. However, this may cause problems if you re-using the same image filename
but the images in those files are changing.
You may reset this image cache with gridpattern::reset_image_cache().
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