colour.gradient.legend.f: Draws a gradient legend for a climate stripes plot

In duplisea/climatestripes: A simple visual depiction of a temperature variable and in most cases climate change

Description

This draws a colour gradient legend for use as a climate stripes legend. It uses rect to draw many rectangles (500) and colours each with a ramp palette so that it appears as a smooth gradient. It is also possible to do this as a rasterImage but these images can be hard to work with and do not scale properly especially for multiplot layouts.

Usage

colour.gradient.legend.f(
  xleft,
  ybottom,
  xright,
  ytop,
  colour.vec = c("blue", "red"),
  ncolours = 500,
  labels = T,
  var.min.label,
  var.max.label,
  text.col.legend
)

Arguments

xleft	the lower left x coordinate of the legend
ybottom	the lower left y coordinate of the legend
xright	the upper right x coordinate of the legend
ytop	the upper right y coordinate of the legend
colour.vec	a vector of colours to ramp between (see colorRampPalette, "colors")
ncolours	the number of colours to show on the legend. Default is 500, a large number produces a smooth legend colour gradient
labels	default TRUE. If TRUE then values you supply (var.min.label) and (var.max.label) are shown on the legend
var.min.label	the value for the highest temperature to show on the legend
var.max.label	the value for the lowest temperature to show on the legend
text.col.legend	colour of the legend text

See Also

rect colorRampPalette

duplisea/climatestripes documentation built on March 27, 2021, 11:47 p.m.