Special panel functions 03

Description

In development specialist panel functions for generating zcase glyph structures.

Usage

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panel.zcasePiePlot(..., zcase.rescale=TRUE, 
         loa.settings = FALSE)

panel.zcasePieSegmentPlot(..., zcase.rescale=TRUE, 
         loa.settings = FALSE)

Arguments

...

Additional arguments, typically setting the color and properties of the plotted glyphs. See below.

zcase.rescale

Should the glyph element be rescaled? See below.

loa.settings

loa options, to be handled by panelPal.

Details

All these panel... functions generate glyphs using z inputs and plot these at the associated (x, y) location. So, for example a called which used one of the panels and the plot formula:

z1 + z2+ z3 + z4 ~ x * y

... would plot a series of glyphs, each containing four elements that would be scaled according to z1, z2, z3 and z4, and each at the associated (x, y) location. This means there will be one discrete glyph for each row of data supplied to the plot call.

panel.zcasePiePlot generates a series of x/y referenced pie graphs. By default, pie dimensions are assigned as: Pie size (radius) proportional to sum of z cases and scaled using cexHandler (z1 + z2 + z3 + z4 for the above formula); Number of Pie segments equal to number of z cases (so, 4 for the above formula); Pie segment width (phi) proportional to the individual zcase (so, z1 / (z1 + z2 + z3 + z4) * 360 for first pie segment for the above formula).

panel.zcasePieSegmentPlot is a variation on the conventional pie plot where segement radius rather than segment width is varying by zcase.

Value

These panel... functions are intended to be used as the panel argument in loa plot calls. So, e.g.:

a <- 1:10
b <- 10:1
loaPlot(a+b~a*a, panel=panel.zcasePiePlot)
loaPlot(a+b~a*a, panel=panel.zcasePieSegmentPlot)

Note

Functions in development. Arguments may change.

Author(s)

Karl Ropkins

References

These function makes extensive use of code developed by others.

lattice: Sarkar, Deepayan (2008) Lattice: Multivariate Data Visualization with R. Springer, New York. ISBN 978-0-387-75968-5

See Also

In loa: loaPlot, panelPal

In other packages: xyplot in lattice.

Examples

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## Example 1
## plotting georeferenced pie plots

#  Use a subsample of lat.lon.meuse
temp <- lat.lon.meuse[sample(1:155, 15),]

#  plot Cu/Pb/Zn pie plots at sampling locations
#  loaPlot(copper+lead+zinc~longitude*latitude, 
#          panel=panel.zcasePiePlot, data=temp)
#  then rescale smaller pie segments on the fly

loaPlot(copper*10+lead*4+zinc~longitude*latitude, 
        panel=panel.zcasePiePlot, data=temp)