scale_identity

scale_colour_identity(name=NULL, breaks=NULL, labels=NULL, formatter=NULL, ...)
scale_fill_identity(name=NULL, breaks=NULL, labels=NULL, formatter=NULL, ...)
scale_size_identity(name=NULL, breaks=NULL, labels=NULL, formatter=NULL, ...)
scale_shape_identity(name=NULL, breaks=NULL, labels=NULL, formatter=NULL, ...)
scale_linetype_identity(name=NULL, breaks=NULL, labels=NULL, formatter=NULL, ...)

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Parameters

Parameters control the appearance of the scale. In addition to the parameters listed below (if any), any aesthetic can be used as a parameter, in which case it will override any aesthetic mapping.

• name: name of scale to appear in legend or on axis. Maybe be an expression: see ?plotmath
• breaks: numeric vector indicating where breaks should lie
• labels: character vector giving labels associated with breaks
• formatter: NULL

Returns

This function returns a scale object.

Examples

> colour <- c("red", "green", "blue", "yellow") 
> qplot(1:4, 1:4, fill = colour, geom = "tile") 
  
> qplot(1:4, 1:4, fill = colour, geom = "tile") + scale_fill_identity() 
  
>  
> # To get a legend, you also need to supply the labels to 
> # be used on the legend 
> qplot(1:4, 1:4, fill = colour, geom = "tile") + 
+   scale_fill_identity(labels = letters[1:4], name = "trt") 
  
>  
> # cyl scaled to appropriate size 
> qplot(mpg, wt, data = mtcars, size = cyl) 
  
>  
> # cyl used as point size 
> qplot(mpg, wt, data = mtcars, size = cyl) + scale_size_identity() 
  
> NA 

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© Hadley Wickham 2010