Simple Examples

In gridify: Enrich Figures and Tables with Custom Headers and Footers and More

knitr::opts_chunk$set(
  collapse = TRUE,
  comment = "#>",
  fig.width = 7,
  fig.height = 4
)

Introduction

This document provides simple examples to illustrate the use of gridify to add headers, footers and more to both figures and tables.

We will cover the use of simple_layout(), complex_layout(), pharma_layout_base(), pharma_layout_A4() and pharma_layout_letter(), and show how to add these layouts to ggplot2 figures, base R figures, flextables, and gt tables.

gridify does not support rtables directly, but we will demonstrate how users can implement gridify with rtables by converting them to flextables (with rtables.officer).

Examples with Figures

We can use gridify with both ggplot2 figures and base R figures.

Examples with ggplot2 Figures

Precedence of Operators

When using the ggplot2 package in conjunction with pipes (%>% or native |>), it's important to understand the precedence of operators to ensure your code works as expected.

In R, the pipe operator (%>% or |>) has a higher precedence than the addition operator (+) used by ggplot2. This means that the %>% or |> operator will be evaluated before the + operator.

Because of this, if you're piping into a ggplot2 call, you need to wrap it in brackets () or {}. This ensures that the entire ggplot2 call is evaluated first, before the result is passed to the next function in the pipe.

Here's an example:

# Load the necessary libraries
library(ggplot2)
# (to use |> version 4.1.0 of R is required, for lower versions we recommend %>% from magrittr)
library(magrittr)

# Create a scatter plot
mtcars %>%
  {
    ggplot2::ggplot(., aes(x = mpg, y = wt)) +
      ggplot2::geom_point()
  } %>%
  print()

Simple Layout Example

Here we create a line plot of mpg against wt using the mtcars dataset.

library(gridify)
fig_obj <- ggplot2::ggplot(data = mtcars, ggplot2::aes(x = mpg, y = wt)) +
  ggplot2::geom_line()

We then use the gridify() function to apply simple_layout().

g <- gridify(fig_obj, layout = simple_layout())

Next, we use the set_cell() function to add a title and footer to our figure before printing it.

g <- g %>%
  set_cell("title", "Title") %>%
  set_cell("footer", "Footer")

print(g)

Complex Layout Example

Here we create a line plot of mpg against wt using the mtcars dataset.

fig_obj <- ggplot2::ggplot(data = mtcars, ggplot2::aes(x = mpg, y = wt)) +
  ggplot2::geom_line()

We then use gridify() to apply complex_layout().

g <- gridify(fig_obj, layout = complex_layout()) %>%
  set_cell("header_left", "Left Header") %>%
  set_cell("header_middle", "Middle Header") %>%
  set_cell("header_right", "Right Header") %>%
  set_cell("title", "Title") %>%
  set_cell("subtitle", "Subtitle") %>%
  set_cell("note", "Note") %>%
  set_cell("footer_left", "Left Footer") %>%
  set_cell("footer_middle", "Middle Footer") %>%
  set_cell("footer_right", "Right Footer")

print(g)

Pharma Layout Examples

Pharma layout base, letter, and A4 are specific layouts for pharmaceutical outputs provided by the gridify package. They have identical predefined cells for headers, footers, titles, subtitles, notes, watermarks, and references. Some of these cells are set by default but can be overwritten.

Pharma Layout Base Example

Here we create a line plot of mpg against wt using the mtcars dataset. We then use the gridify() function to apply pharma_layout_base().

figure_obj <- ggplot2::ggplot(data = mtcars, ggplot2::aes(x = mpg, y = wt)) +
  ggplot2::geom_line()

g <- gridify(object = figure_obj, layout = pharma_layout_base()) %>%
  set_cell("header_left_1", "Left Header 1") %>%
  set_cell("header_left_2", "Left Header 2") %>%
  set_cell("header_left_3", "Left Header 3") %>%
  set_cell("header_right_1", "Right Header 1") %>%
  set_cell("header_right_2", "Right Header 2") %>%
  set_cell("header_right_3", "Right Header 3") %>%
  set_cell("output_num", "Output") %>%
  set_cell("title_1", "Title 1") %>%
  set_cell("title_2", "Title 2") %>%
  set_cell("title_3", "Title 3") %>%
  set_cell("by_line", "By Line") %>%
  set_cell("note", "Note") %>%
  set_cell("references", "References") %>%
  set_cell("footer_left", "Left Footer") %>%
  set_cell("footer_right", "Right Footer") %>%
  set_cell("watermark", "Watermark")

print(g)

Pharma Layout Letter Example

Here we apply pharma_layout_letter() with just the main cells filled in.

figure_obj <- ggplot2::ggplot(data = mtcars, ggplot2::aes(x = mpg, y = wt)) +
  ggplot2::geom_line()

g <- gridify(object = figure_obj, layout = pharma_layout_letter()) %>%
  set_cell("header_left_1", "My Company") %>%
  set_cell("header_left_2", "<PROJECT> / <INDICATION>") %>%
  set_cell("header_left_3", "<STUDY>") %>%
  set_cell("header_right_2", "<Draft or Final>") %>%
  set_cell("output_num", "<Figure> xx.xx.xx") %>%
  set_cell("title_1", "<Title 1>") %>%
  set_cell("title_2", "<Title 2>") %>%
  set_cell("note", "<Note or Footnotes>") %>%
  set_cell("references", "<References:>") %>%
  set_cell("footer_left", "Program: <PROGRAM NAME>, YYYY-MM-DD at HH:MM") %>%
  set_cell("footer_right", "Page xx of nn") %>%
  set_cell("watermark", "Draft")

print(g)

Pharma Layout A4 Example

Here we apply pharma_layout_A4() to the prior example. Note the difference in the margin on the right for the A4 sized output.

figure_obj <- ggplot2::ggplot(data = mtcars, ggplot2::aes(x = mpg, y = wt)) +
  ggplot2::geom_line()

g <- gridify(object = figure_obj, layout = pharma_layout_A4()) %>%
  set_cell("header_left_1", "My Company") %>%
  set_cell("header_left_2", "<PROJECT> / <INDICATION>") %>%
  set_cell("header_left_3", "<STUDY>") %>%
  set_cell("header_right_2", "<Draft or Final>") %>%
  set_cell("output_num", "<Figure> xx.xx.xx") %>%
  set_cell("title_1", "<Title 1>") %>%
  set_cell("title_2", "<Title 2>") %>%
  set_cell("note", "<Note or Footnotes>") %>%
  set_cell("references", "<References:>") %>%
  set_cell("footer_left", "Program: <PROGRAM NAME>, YYYY-MM-DD at HH:MM") %>%
  set_cell("footer_right", "Page xx of nn") %>%
  set_cell("watermark", "Draft")

print(g)

Example with a Base R Figure

The gridify package can also be used with base R figures. To use base R figures with gridify, we first convert them to a formula using ~, before passing them to gridify().

In this example, we create a simple base R bar plot and convert it to a formula using ~.

formula_object <- ~ barplot(1:10)

Then we pass the formula to gridify() and apply complex_layout().

g <- gridify(object = formula_object, layout = complex_layout()) %>%
  set_cell("header_left", "Left Header") %>%
  set_cell("header_middle", "Middle Header") %>%
  set_cell("header_right", "Right Header") %>%
  set_cell("title", "Title") %>%
  set_cell("subtitle", "Subtitle") %>%
  set_cell("note", "Note") %>%
  set_cell("footer_left", "Left Footer") %>%
  set_cell("footer_middle", "Middle Footer") %>%
  set_cell("footer_right", "Right Footer")

print(g)

Examples with Tables

We can add text elements using all the previously mentioned layouts to flextable and gt tables using gridify. rtables objects are not directly supported by gridify, but we can use gridify with rtables by first converting them to flextables.

Example with a flextable

Here we create a flextable using the mtcars dataset.

# (to use `gridify` with flextables we require the function `as_grob()` to convert flextables into grob
# objects, which exists in versions >= 0.8.0 of `flextable`)

library(flextable)

ft <- flextable::flextable(head(mtcars[1:10]))

Then we pass the table to gridify() and apply pharma_layout_letter().

g <- gridify(object = ft, layout = pharma_layout_letter()) %>%
  set_cell("header_left_1", "My Company") %>%
  set_cell("header_left_2", "<PROJECT> / <INDICATION>") %>%
  set_cell("header_left_3", "<STUDY>") %>%
  set_cell("header_right_2", "<Draft or Final>") %>%
  set_cell("output_num", "<Table> xx.xx.xx") %>%
  set_cell("title_1", "<Title 1>") %>%
  set_cell("title_2", "<Title 2>") %>%
  set_cell("note", "<Note or Footnotes>") %>%
  set_cell("references", "<References:>") %>%
  set_cell("footer_left", "Program: <PROGRAM NAME>, YYYY-MM-DD at HH:MM") %>%
  set_cell("footer_right", "Page xx of nn") %>%
  print(g)

Example with a gt Table

Here we create a gt table using the mtcars dataset.

# (to use `gridify` with gt tables we require the function `as_gtable()` to convert gt tables into
# grob objects, which exists in versions >= 0.11.0 of `gt`)

library(gt)

gt_obj <- gt::gt(head(mtcars[1:10]))

Then we pass the table to gridify() and apply pharma_layout_letter().

g <- gridify(object = gt_obj, layout = pharma_layout_letter()) %>%
  set_cell("header_left_1", "My Company") %>%
  set_cell("header_left_2", "<PROJECT> / <INDICATION>") %>%
  set_cell("header_left_3", "<STUDY>") %>%
  set_cell("header_right_2", "<Draft or Final>") %>%
  set_cell("output_num", "<Table> xx.xx.xx") %>%
  set_cell("title_1", "<Title 1>") %>%
  set_cell("title_2", "<Title 2>") %>%
  set_cell("note", "<Note or Footnotes>") %>%
  set_cell("references", "<References:>") %>%
  set_cell("footer_left", "Program: <PROGRAM NAME>, YYYY-MM-DD at HH:MM") %>%
  set_cell("footer_right", "Page xx of nn")

print(g)

Example with an rtable via flextable conversion

We will demonstrate how to use gridify with rtables by converting the rtable to a flextable and then modifying any aesthetics.

Here we build a simple rtable using the iris dataset.

library(rtables)
rtabl <- rtables::basic_table(main_footer = " ") %>%
  rtables::split_cols_by("Species") %>%
  rtables::analyze(
    c("Sepal.Length", "Sepal.Width", "Petal.Length"),
    function(x, ...) {
      rtables::in_rows(
        "Mean (sd)" = c(mean(x), stats::sd(x)),
        "Median" = median(x),
        "Min - Max" = range(x),
        .formats = c("xx.xx (xx.xx)", "xx.xx", "xx.xx - xx.xx")
      )
    }
  ) %>%
  rtables::build_table(iris)

Then we convert the rtable to a flextable using the function tt_to_flextable() from the rtables.officer package. We specify theme = NULL to prevent the addition of borders which tt_to_flextable() adds by default.

library(rtables.officer)

ft <- rtables.officer::tt_to_flextable(rtabl, theme = NULL)

Next we adjust some of the aesthetics of the flextable.

ft <- flextable::font(ft, fontname = "serif", part = "all")

Finally we pass the flextable to gridify() and apply pharma_layout_A4(), before printing the table.

g <- gridify(ft, layout = pharma_layout_A4()) %>%
  set_cell("header_left_1", "My Company") %>%
  set_cell("header_left_2", "PROJECT") %>%
  set_cell("header_left_3", "STUDY") %>%
  set_cell("header_right_1", "CONFIDENTIAL") %>%
  set_cell("header_right_2", "Draft") %>%
  set_cell("header_right_3", "Data Cut-off: 2000-01-01") %>%
  set_cell("output_num", "<Table> xx.xx.xx") %>%
  set_cell("title_1", "Summary Table for Iris Dataset") %>%
  set_cell("note", "Note") %>%
  set_cell("references", "References") %>%
  set_cell("footer_left", sprintf("Program: My Programme, %s at %s", Sys.Date(), format(Sys.time(), "%H:%M"))) %>%
  set_cell("footer_right", "Page 1 of 1") %>%
  set_cell("watermark", "DRAFT")

print(g)

Using the show() Methods

When using gridify, we can utilize the show() methods to find out information such as the cells available in a gridify object or the specifications of a layout object.

Here we take the earlier example where we applied simple_layout() to a line plot.

fig_obj <- ggplot2::ggplot(data = mtcars, ggplot2::aes(x = mpg, y = wt)) +
  ggplot2::geom_line()

g <- gridify(fig_obj, layout = simple_layout())

To access the available cells in a gridify object, we can use the show() method.

show(g)

Alternatively, you can simply evaluate the object. This will display the cells included in the applied layout, and whether or not they have been filled by the gridify object.

g

As stated in the console output from the above example, we can use show_spec(g) to gain further insight into the specifications of g's layout.

show_spec(g)

We can do the same with simple_layout() (and any other layout) if we want to view its specs.

simple_layout()

Note: This is effectively the same as calling show_spec(simple_layout).

Graphical Parameters

Within every layout function, you can set the global graphical parameters for all text elements and default graphical parameters for individual text elements. You can use the show_spec() function to see if global and default graphical parameters are set.

You can alter individual graphical parameters using the set_cell() function. Setting a value at the individual level supersedes the global level.

If not specified in your function calls, the defaults within the gridify function are used.

Please read more about Default Graphical Parameters in vignette("create_custom_layout", package = "gridify").

To see all available graphical parameters view grid::gpar documentation.

Global and Individual Graphical Parameters Example

Here is an example where we set global graphical parameters to a complex layout. We set the font colour to "navy", and font size to 12.

figure_obj <- ggplot2::ggplot(data = mtcars, ggplot2::aes(x = mpg, y = wt)) +
  ggplot2::geom_line()

g <- gridify(object = figure_obj, layout = complex_layout(global_gpar = grid::gpar(col = "navy", fontsize = 12))) %>%
  set_cell("header_left", "Left Header") %>%
  set_cell("header_middle", "Middle Header") %>%
  set_cell("title", "Title") %>%
  set_cell("subtitle", "Subtitle") %>%
  set_cell("note", "Note") %>%
  set_cell("footer_left", "Left Footer") %>%
  set_cell("footer_middle", "Middle Footer") %>%
  set_cell("footer_right", "Right Footer")

Now we set individual graphical parameters for the right_header. We set the font colour to "purple" and the font size to 20.

g <- g %>%
  set_cell("header_right", "Right Header", gpar = grid::gpar(col = "purple", fontsize = 20))

print(g)

Background Colour Example

Here is an example of how to set the background colour using the background argument in simple_layout(). By default, it uses grid::get.gpar()$fill (white background). In this example, we set the background colour to "beige".

The background argument works across all built-in layout functions, including simple_layout(), complex_layout(), pharma_layout_base(), pharma_layout_A4(), and pharma_layout_letter(). It can also be applied in any custom layouts you create (vignette("create_custom_layout", package = "gridify")).

Note: When using ggplot2, you may also need to set the plot's background colour to match the layout's background.

figure_obj <- ggplot2::ggplot(data = mtcars, ggplot2::aes(x = mpg, y = wt)) +
  ggplot2::theme(
    plot.background = ggplot2::element_rect(fill = "beige", colour = NA),  # Entire plot background
    panel.background = ggplot2::element_rect(fill = "beige", colour = NA),     # Panel (where data is plotted)
    panel.border = ggplot2::element_rect(colour = "black", fill = NA)
  ) +
  ggplot2::geom_line()

g <- gridify(figure_obj, layout = simple_layout(background = "beige")) %>%
  set_cell("title", "Title") %>%
  set_cell("footer", "Footer")

print(g)

set_cell() Arguments

As well as adjusting the individual graphical parameters as shown above, we can also use set_cell() to customise various features such as maximum characters per line, position, and rotation for text elements.

Maximum Characters

We can specify the maximum number of characters per line using the argument mch. This is useful for wrapping long strings across multiple lines.

Here is an example of a figure with simple_layout() applied. We set the footer to a long string, and then set the maximum number of characters per line to 45 using the mch argument.

figure_obj <- ggplot2::ggplot(data = mtcars, ggplot2::aes(x = mpg, y = wt)) +
  ggplot2::geom_line()

long_footer_string <- paste0(
  "This is a footer. We can have a long description here.",
  "We can have another long description here.",
  "We can have another long description here."
)

g <- gridify(figure_obj, layout = simple_layout()) %>%
  set_cell("title", "Title") %>%
  set_cell("footer", long_footer_string, mch = 45)

print(g)

Position and Rotation

We can also use set_cell() to adjust position and rotation of text elements:

• x and y define the x and y coordinates of the text element. For example x = 0 places the element at the far left and x = 1 at the far right.

• hjust and vjust control how the text element is anchored relative to the x or y point. For instance:

• hjust = 0 aligns the left edge of the element to x.
• hjust = 0.5 centers the element at x.

• hjust = 1 aligns the right edge of the element to x.

• vjust works in a similar way with y.

• vjust = 0 aligns the bottom edge of the element to y.
• vjust = 0.5 centers the element at y.

• vjust = 1 aligns the top edge of the element to y.

• rot sets the rotation angle of the text element in degrees, applied anticlockwise from the x-axis.

x, y, hjust, and vjust all take values between 0 and 1.

We now take the previous example and apply x = 0, hjust = 0, and rot = 5 to the footer. This aligns the left edge of the footer to the left corner of the cell, with a rotation of 5 degrees.

g <- gridify(figure_obj, layout = simple_layout()) %>%
  set_cell("title", "Title") %>%
  set_cell("footer", long_footer_string, mch = 45, x = 0, hjust = 0, rot = 5)

print(g)

Altering Scales and Adjusting Dimensions

When using the simple_layout() and complex_layout() functions, there is an optional scales argument which can be either "fixed" (default) or "free".

The "fixed" scale ensures that cells for text elements (titles, footers, etc.) retain a static height, with the figure / table taking up the remaining space. This prevents text overlap while maintaining a structured layout, but may result in different height proportions between the text elements and the output. The "free" scale sets the heights of the cells to be proportional to the size of the output.

Here is an example of a figure with complex_layout() and the default scales = "fixed" applied.

fixed_scales_g <- gridify(
  object = ggplot2::ggplot(data = mtcars, ggplot2::aes(x = mpg, y = wt)) +
    ggplot2::geom_line(),
  layout = complex_layout()
) %>%
  set_cell("header_right", "Right Header") %>%
  set_cell("title", "Title", gpar = grid::gpar(fontsize = 30)) %>%
  set_cell("subtitle", "Subtitle", gpar = grid::gpar(fontsize = 30)) %>%
  set_cell("note", "Note", gpar = grid::gpar(fontsize = 30)) %>%
  set_cell("footer_left", "Left Footer", hjust = 1, vjust = 0.5, gpar = grid::gpar(fontsize = 10)) %>%
  set_cell("footer_middle", "Middle Footer", gpar = grid::gpar(fontsize = 30)) %>%
  set_cell("footer_right", "Right Footer", hjust = 0, vjust = 0.5, gpar = grid::gpar(fontsize = 10))

print(fixed_scales_g)

When we apply scales = "free" text elements scale dynamically, which may cause overlap if the output space is small.

free_scales_g <- gridify(
  object = ggplot2::ggplot(data = mtcars, ggplot2::aes(x = mpg, y = wt)) +
    ggplot2::geom_line(),
  layout = complex_layout(scales = "free")
) %>%
  set_cell("header_right", "Right Header") %>%
  set_cell("title", "Title", gpar = grid::gpar(fontsize = 30)) %>%
  set_cell("subtitle", "Subtitle", gpar = grid::gpar(fontsize = 30)) %>%
  set_cell("note", "Note", gpar = grid::gpar(fontsize = 30)) %>%
  set_cell("footer_left", "Left Footer", hjust = 1, vjust = 0.5, gpar = grid::gpar(fontsize = 10)) %>%
  set_cell("footer_middle", "Middle Footer", gpar = grid::gpar(fontsize = 30)) %>%
  set_cell("footer_right", "Right Footer", hjust = 0, vjust = 0.5, gpar = grid::gpar(fontsize = 10))

print(free_scales_g)

When working with .Rmd or .Qmd files, we can also remove the text overlap when scales = "free" by adjusting the knitr options fig.width and fig.height to expand the output.

print(free_scales_g)

When exporting to .pdf, .png or .jpeg we can remove text overlap by adjusting width and height whilst using the export_to() function. This will be explained in more detail in the section Exporting to PDF, PNG, TIFF, and JPEG below.

Adjusting the Height of Rows using Global Options

gridify provides two global options (gridify.adjust_height.default and gridify.adjust_height.line) for adjusting row heights in layouts, based on measurement height units and when adjust_height (a layout argument) equals TRUE.

It is not recommended to set these options unless truly needed, as it may lead to inconsistencies between projects.

How These Options Work

By default:

• For non-line units ("cm", "inches", "mm"), row heights are adjusted by 0.25.
• For line-based units ("lines"), row heights are adjusted by 0.10.

These values can be increased to create more spacing between text elements using the following global options:

• gridify.adjust_height.default – applies when row heights are in "cm", "inches", or "mm".
• gridify.adjust_height.line – applies when row heights are in "lines".

Please note that these options will not affect any row with a unit of "npc", as then the row height is not defined by a measurement but a percentage of available height. These options will work only with height units "cm", "inch", "mm", or "lines" and when the adjust_height argument equals TRUE.

For simple_layout() and complex_layout():

• When scales = "free", the height unit is "npc" (not supported by either adjustment option).
• When scales = "fixed" (the default), the height unit is "lines", making only gridify.adjust_height.line applicable.
• adjust_height is always set to TRUE within the function code.

For pharma_layout_base(), pharma_layout_letter() and pharma_layout_A4():

• The height unit is "lines", making only gridify.adjust_height.line applicable.
• The adjust_height argument is TRUE by default, so users do not have to set this argument.

In summary, only gridify.adjust_height.line is applicable to predefined layouts, and for simple_layout() and complex_layout(), only when scales = "fixed".

In contrast, gridify.adjust_height.default is not applicable to any predefined layout. It can instead be used with custom layouts in a similar way to gridify.adjust_height.line - see vignette("create_custom_layout", package = "gridify").

Examples using Global Options

Example with complex_layout()

Here is an example of the use of gridify.adjust_height.line with complex_layout(). We create a gridify object by applying complex_layout() with scales = "fixed" to a line plot and print the object to view it with default adjustments.

g <- gridify(
  object = ggplot2::ggplot(data = mtcars, ggplot2::aes(x = mpg, y = wt)) +
    ggplot2::geom_line(),
  layout = complex_layout()
) %>%
  set_cell("header_left", "Left Header") %>%
  set_cell("header_middle", "Middle Header") %>%
  set_cell("header_right", "Right Header") %>%
  set_cell("title", "Title") %>%
  set_cell("subtitle", "Subtitle") %>%
  set_cell("note", "Note") %>%
  set_cell("footer_left", "Left Footer") %>%
  set_cell("footer_middle", "Middle Footer") %>%
  set_cell("footer_right", "Right Footer")

print(g)

Now we set gridify.adjust_height.line to 0.7 using the options() function. This increases the height of the rows and the space between text elements.

options(gridify.adjust_height.line = 0.7)

print(g)

Example with pharma_layout_letter()

Here is an example of the use of gridify.adjust_height.line with pharma_layout_letter(). We set the gridify.adjust_height.line option back to the default of 0.1. Then we create a gridify object by applying pharma_layout_letter() to a line plot.

options(gridify.adjust_height.line = 0.1)

g <- gridify(
  object = ggplot2::ggplot(data = mtcars, ggplot2::aes(x = mpg, y = wt)) +
    ggplot2::geom_line(),
  layout = pharma_layout_letter()
) %>%
  set_cell("header_left_1", "My Company") %>%
  set_cell("header_left_2", "<PROJECT> / <INDICATION>") %>%
  set_cell("header_left_3", "<STUDY>") %>%
  set_cell("header_right_2", "<Draft or Final>") %>%
  set_cell("output_num", "<Figure> xx.xx.xx") %>%
  set_cell("note", "<Note or Footnotes>") %>%
  set_cell("references", "<References:>") %>%
  set_cell("footer_left", "Program: <PROGRAM NAME>, YYYY-MM-DD at HH:MM") %>%
  set_cell("footer_right", "Page xx of nn")

print(g)

Now we set gridify.adjust_height.line to 0.7.

options(gridify.adjust_height.line = 0.7)

print(g)

Export to PDF, PNG, TIFF, and JPEG {#exporting-section}

We can export gridify objects to PDF, PNG, TIFF, and JPEG files using the export_to() function.

Here is an example where we export a gridify object to a PDF file.

We take the earlier example where we applied pharma_layout_letter() to a line plot.

gridify_obj <- gridify(
  object = ggplot2::ggplot(data = mtcars, ggplot2::aes(x = mpg, y = wt)) +
    ggplot2::geom_line(),
  layout = pharma_layout_letter()
) %>%
  set_cell("header_left_1", "My Company") %>%
  set_cell("header_left_2", "<PROJECT> / <INDICATION>") %>%
  set_cell("header_left_3", "<STUDY>") %>%
  set_cell("header_right_2", "<Draft or Final>") %>%
  set_cell("output_num", "<Figure> xx.xx.xx") %>%
  set_cell("title_1", "<Title 1>") %>%
  set_cell("title_2", "<Title 2>") %>%
  set_cell("note", "<Note or Footnotes>") %>%
  set_cell("references", "<References:>") %>%
  set_cell("footer_left", "Program: <PROGRAM NAME>, YYYY-MM-DD at HH:MM") %>%
  set_cell("footer_right", "Page xx of nn") %>%
  set_cell("watermark", "Draft")

Then we pass the gridify object to the export_to() function. We specify the desired file type and name using the to argument.

export_to(gridify_obj, to = "output.pdf")

Instead of just a file name, the to argument can also be set to a file path if we want to change the location where the file is saved.

export_to(gridify_obj, to = "~/folder1/output.pdf")

To export the object to a PNG file, we specify a file name with the .png file extension.

export_to(gridify_obj, to = "output.png")

To export the object to a TIFF file, we specify a file name with the .tiff or .tif file extension.

export_to(gridify_obj, to = "output.tiff")

Similarly, to export the object to a JPEG file, we specify a file name with the .jpeg or .jpg file extension. We can also modify characteristics such as width and height by passing them into export_to() after the to argument.

export_to(gridify_obj, to = "output.jpeg", width = 2400, height = 1800, res = 300)

Conclusion

These examples should give you a good understanding of how to use the gridify package to add text elements to simple figures and tables. Remember, you can customize the layout and text elements to suit your needs. Happy gridifying!

To see how to use gridify with more complex examples such as multi-page figures and tables please check out vignette("multi_page_examples", package = "gridify"). If you need a custom layout suited for your needs please check out vignette("create_custom_layout", package = "gridify").

gridify documentation built on Feb. 5, 2026, 5:09 p.m.