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.
how to draw the legend about color from 3d picture
3 messages · yk, Duncan Murdoch, Greg Snow
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
Look at the color.legend function in the plotrix package to see if it does what you want. You may want to use the layout function to split the graphics device into 2 sections, one for the persp plot and the other to hold the legend. Hope this helps, -- Gregory (Greg) L. Snow Ph.D. Statistical Data Center Intermountain Healthcare greg.snow at imail.org (801) 408-8111
-----Original Message----- From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org] On Behalf Of yk Sent: Friday, September 05, 2008 6:07 AM To: r-help at r-project.org Subject: [R] how to draw the legend about color from 3d picture 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.
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