Continuous scale constructor.
continuous_scale(aesthetics, scale_name, palette, name = waiver(), breaks = waiver(), minor_breaks = waiver(), labels = waiver(), limits = NULL, rescaler = rescale, oob = censor, expand = waiver(), na.value = NA_real_, trans = "identity", guide = "legend", position = "left", super = ScaleContinuous)
aesthetics  the names of the aesthetics that this scale works with 

scale_name  the name of the scale 
palette  a palette function that when called with a single integer argument (the number of levels in the scale) returns the values that they should take 
name  The name of the scale. Used as axis or legend title. If

breaks  One of:

minor_breaks  One of:

labels  One of:

limits  A numeric vector of length two providing limits of the scale.
Use 
rescaler  Used by diverging and n colour gradients
(i.e. 
oob  Function that handles limits outside of the scale limits (out of bounds). The default replaces out of bounds values with NA. 
expand  A numeric vector of length two giving multiplicative and
additive expansion constants. These constants ensure that the data is
placed some distance away from the axes. The defaults are

na.value  Missing values will be replaced with this value. 
trans  Either the name of a transformation object, or the object itself. Builtin transformations include "asn", "atanh", "boxcox", "exp", "identity", "log", "log10", "log1p", "log2", "logit", "probability", "probit", "reciprocal", "reverse" and "sqrt". A transformation object bundles together a transform, it's inverse,
and methods for generating breaks and labels. Transformation objects
are defined in the scales package, and are called 
guide  Name of guide object, or object itself. 
position  The position of the axis. "left" or "right" for vertical scales, "top" or "bottom" for horizontal scales 
super  The super class to use for the constructed scale 