EMtriangle {colourvision}

Endler and Mielke (2005) triangle colour space

Description

Plots a triangle colour space for trichromatic Endler and Mielke (2005) colour vision model.

Usage

EMtriangle(x, y, type=c("length", "edge"), vnames=c("u","s","m"),
           ylim=c(-0.9,0.9), xlim=c(-0.9,0.9),
           pch=16, bty="n",yaxt="n",xaxt="n",
           col="black", asp=1, ann=FALSE, vectors=FALSE, ...)

Arguments

x

x-coordinate

y

y-coordinate

type

Whether the colour space should be built with a fixed vector length, or a fixed edge length (distance between vertices).

vnames

Vector names

ylim

see plot function.

xlim

see plot function.

pch

see par function.

bty

see par function.

yaxt

see par function.

xaxt

see par function.

col

see par function.

asp

see plot function.

ann

see par function.

vectors

Whether vectors representing direction of photoreceptor outputs should be plotted.

...

Other arguments passed to plot.

Details

The original model is available for tetrachromatic animals only. Trichromatic version is implemented in colourvision based on Pike (2012) formula. The triangle is built either with a vector length = 0.75 or a edge length = sqrt(3/2), to match the tetrahedron proposed by Endler and Mielke (2005). Doris Gomez derived a trichromatic version which is available in software AVICOL (Gomez, 2006) and was previously implemented here (colouvision v0.1).

Author(s)

Felipe M. Gawryszewski [e-mail]

References

Endler, J. A., and P. Mielke. 2005. Comparing entire colour patterns as birds see them. Biol J Linn Soc 86:405-431.

Pike, T.W. 2012. Generalised chromaticity diagrams for animals with n-chromatic colour vision. Journal of Insect Behavior 255: 277-286.

Gomez, D. 2006. AVICOL, a program to analyse spectrometric data. Last update october 2011. Free executable available at:
http://sites.google.com/site/avicolprogram/ or from the author at [e-mail]

See Also

EMtetrahedron, EMmodel

Examples

EMtriangle(x=0,y=0, type="length", pch=16, col="red")