Save plots in multiple formats with standardized resolution

Save a plot object into PDF, TIFF, and PNG formats simultaneously with predefined scaling rules for width, height, and resolution. Output files are automatically organized into subdirectories under a Fig/ folder.

Usage

saveplot(object, filenames = NULL, width = NULL, height = NULL, dpi = 600)

Arguments

object

A plot object to be saved. Can be a ggplot object or a grid graphical object such as gList.

filenames

A character string specifying the base filename (without file extension) for the output figures.

width

Numeric. Figure width in inches. Must be provided.

height

Numeric. Figure height in inches. Must be provided.

dpi

Numeric. Resolution in dots per inch. Default is 600.

Value

Invisibly returns NULL. The function is called for its side effect of writing figure files to disk.

Details

This function is designed for publication-quality figure export, supporting both ggplot objects and grid graphical objects (e.g., gList).

The function creates a directory structure:

Fig/PDF

PDF output

Fig/TIFF

TIFF output

Fig/PNG

PNG output

File dimensions are scaled internally:

• PDF: width and height multiplied by 2.

• TIFF: width and height multiplied by 1000.

• PNG: width and height multiplied by 500.

For PNG output, if dpi > 600, the resolution is automatically set to 300; otherwise, dpi/2 is used.

If object is of class gList, the plot is rendered using grid.draw(); otherwise, print() is used.

Examples

if (FALSE) { # \dontrun{
library(ggplot2)
p <- ggplot(mtcars, aes(wt, mpg)) + geom_point()

saveplot(
  object = p,
  filenames = "mtcars_scatter",
  width = 6,
  height = 4,
  dpi = 600
)
} # }