Scale

A scale defines how a given variable will be mapped to an aesthetic value: whether the mapping will be discrete, continuous, linear, logarithmic, etc.

List of Scales

• gg.scale.id - identity scale (for when the data is already in the desired output)
• gg.scale.continuous - continuous scale mapping from an interval to another interval
• gg.scale.discrete - discrete scale mapping from a set of discrete values to points in an interval
• gg.scale.palette - a color scale that maps from a discrete set of values to a set of colors
• gg.scale.gradient - a color scale that maps from a continuous set of values to a range of colors
• gg.scale.symbol - a discrete scale mapping from a set of discrete values to symbols

gg.scale.*()

Initializes a scale. The following scales take optional parameters:

• gg.scale.continuous(transform, min, max)
  • transform -- a function used on the input before it is mapped linearly to the output. For now, continuous scales supports linear, log and sqrt transforms.
  • min -- force a minimum value on the domain of the scale. This will change the area being plotted, as well as the axis.
  • max -- force a maximum value on the domain of the scale. This will change the area being plotted, as well as the axis.
• gg.scale.palette(palette)
  • palette -- a name of a colorbrewer palette to use.
• gg.scale.gradient(low, high)
  • low -- the color that the min value of the domain will be mapped to
  • high -- the color that the max value of the domain will be mapped to