mapplots (version 1.5.3)

barplot2D: Draw 2-dimensional barplots

Description

This function is used by draw.barplot2D to add a 2-dimensional barplot at a specific location to an existing plot. It can be used directly but in general it is advisable to use draw.barplot2D instead.

Usage

barplot2D(z, x = 0, y = 0, width = 1, height = 1, colour, add = TRUE, col.frame = NULL, 
	lwd.frame = 1, threshold = 1.1, ...)

Arguments

z

vector, containing positive numbers (NAs are discarded), to be used as the area of the rectangles

colour

a vector (same length as z) of colors to be used in filling the rectangles

x, y

the location of the centre of the pie on the x and y-scale of the existing plot.

width, height

the width and height of the 2D barplot (user coordinate units).

add

logical, should the 2D barplot be added to an existing plot> Defaults to TRUE

col.frame

the colour of the frame of the 2D barplot

lwd.frame

the line width of the frame of the 2D barplot

threshold

the maximum acceptable aspect ratio of the rectangles

...

arguments to be passed to polygon

Author

Adapted by Hans Gerritsen

Details

The algorithm that determines the location of each rectangle within the 2D-barplot is as follows: 1) Start with a rectangle representing the highest value of z. 2) Try to put the first rectangle on the left. 3) If it too elongated, try to put two rectangles, on top of each other, on the left. 4) When you have placed those rectangles, proceed with the remaining rectangles.

More precisely, we choose the number of rectangles to stack so as to minimize the following penalty: penalty for the first rectangle in the stack + penalty for the last where the penalty of a rectangle is: ratio - 1.1. where ratio is the ratio of the longer side by the smaller.

References

This function was adapted from code published on http://zoonek2.free.fr/UNIX/48_R/03.html (accessed 1 Jun 2012).

See Also

draw.barplot2D

Examples

plot(NA,NA, xlim=c(-1,1), ylim=c(-1,1) )
barplot2D(z=rpois(6,10), x=-0.5, y=0.5, width=0.75, height=0.75, colour=rainbow(6))
barplot2D(z=rpois(4,10), x=0.5, y=-0.5, width=0.5, height=0.5, colour=rainbow(4))