Message-ID: <48C12F9C.7060003@stats.uwo.ca>
Date: 2008-09-05T13:09:48Z
From: Duncan Murdoch
Subject: how to draw the legend about color from 3d picture
In-Reply-To: <81385cc7-6891-4b92-afa5-6bfe4c78a68d@b2g2000prf.googlegroups.com>
On 9/5/2008 8:06 AM, yk wrote:
> I have drawed a picture with persp, it's 3d map with different color,
> indicate different altitude. In gnuplot, the corresponding command
> 'splot' will generate a picture beside to indicate the relationship
> between color and altitude. But in R, how to draw it? I have read the
> manual of legend, but they are all about how to draw a legend with
> colored text, not a continuous varing color with corresponding number.
I don't think there's an automatic way to do this (though probably some
package provides one).
If you want to write your own, take a look at example(filled.contour).
The legend it draws is done by this code:
plot.new()
plot.window(xlim = c(0, 1), ylim = range(levels), xaxs = "i",
yaxs = "i")
rect(0, levels[-length(levels)], 1, levels[-1], col = col)
if (missing(key.axes)) {
if (axes)
axis(4)
}
else key.axes
box()
(but it has done a lot of setup using layout() and par() before this).
Duncan Murdoch