shiny (version 1.5.0)

renderPlot: Plot Output

Description

Renders a reactive plot that is suitable for assigning to an output slot.

Usage

renderPlot(
  expr,
  width = "auto",
  height = "auto",
  res = 72,
  ...,
  env = parent.frame(),
  quoted = FALSE,
  execOnResize = FALSE,
  outputArgs = list()
)

Arguments

expr

An expression that generates a plot.

width, height

Height and width can be specified in three ways:

• "auto", the default, uses the size specified by plotOutput() (i.e. the offsetWidth/`offsetHeight`` of the HTML element bound to this plot.)

• An integer, defining the width/height in pixels.

• A function that returns the width/height in pixels (or "auto"). The function is executed in a reactive context so that you can refer to reactive values and expression to make the width/height reactive.

When rendering an inline plot, you must provide numeric values (in pixels) to both width and height.

res

Resolution of resulting plot, in pixels per inch. This value is passed to grDevices::png(). Note that this affects the resolution of PNG rendering in R; it won't change the actual ppi of the browser.

...

Arguments to be passed through to grDevices::png(). These can be used to set the width, height, background color, etc.

env

The environment in which to evaluate expr.

quoted

Is expr a quoted expression (with quote())? This is useful if you want to save an expression in a variable.

execOnResize

If FALSE (the default), then when a plot is resized, Shiny will replay the plot drawing commands with grDevices::replayPlot() instead of re-executing expr. This can result in faster plot redrawing, but there may be rare cases where it is undesirable. If you encounter problems when resizing a plot, you can have Shiny re-execute the code on resize by setting this to TRUE.

outputArgs

A list of arguments to be passed through to the implicit call to plotOutput() when renderPlot is used in an interactive R Markdown document.

Interactive plots

With ggplot2 graphics, the code in renderPlot should return a ggplot object; if instead the code prints the ggplot2 object with something like print(p), then the coordinates for interactive graphics will not be properly scaled to the data space.

See plotOutput() for more information about interactive plots.

Details

The corresponding HTML output tag should be div or img and have the CSS class name shiny-plot-output.

See Also

For the corresponding client-side output function, and example usage, see plotOutput(). For more details on how the plots are generated, and how to control the output, see plotPNG(). renderCachedPlot() offers a way to cache generated plots to expedite the rendering of identical plots.