Renders a reactive plot that is suitable for assigning to an output
slot.
renderPlot(
expr,
width = "auto",
height = "auto",
res = 72,
...,
alt = "Plot object",
env = parent.frame(),
quoted = FALSE,
execOnResize = FALSE,
outputArgs = list()
)An expression that generates a plot.
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.
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.
Alternate text for the HTML <img> tag
if it cannot be displayed or viewed (i.e., the user uses a screen reader).
In addition to a character string, the value may be a reactive expression
(or a function referencing reactive values) that returns a character string.
NULL or "" is not recommended because those should be limited to decorative images
(the default is "Plot object").
The environment in which to evaluate expr.
Is expr a quoted expression (with quote())? This
is useful if you want to save an expression in a variable.
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.
A list of arguments to be passed through to the implicit
call to plotOutput() when renderPlot is used in an
interactive R Markdown document.
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.
The corresponding HTML output tag should be div or img and have
the CSS class name shiny-plot-output.
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.