I am plotting some point data using plot3d(). I would like to bring my y axis tick labels a little closer to my y axis tick marks.
The best way I can think of doing this is to
1) plot the data first, without drawing the axes
2) call on axis3d() to draw the y axis and tick marks but suppress labels from being drawn.
3) query the current position of each tick mark in 3D space. Store positions in a vector.
4) use mtext3d() to add labels at positions based on an adjustment to the vector
I am having a problem at step 3. I don't know how to query the position of each tick mark. par3d() allows you to query a number of graphical parameters, is there something similar I can use to get the position each y axis tick?
Am I approaching this wrong? Probably.
Here is an example piece of code, without text added for y axis labels....
require(rgl)
x <- rnorm(5)
y <- rnorm(5)
z <- rnorm(5)
open3d()
plot3d(x,y,z,axes=F,xlab="",ylab="",zlab="")
par3d(ignoreExtent=TRUE)
par3d(FOV=0)
par3d(userMatrix=rotationMatrix(0,1,0,0))
axis3d('y',nticks=5,labels = FALSE)
par3d(zoom=1)
par3d(windowRect=c(580,60,1380,900))
One way to do this is to explicitely define the tick locations before drawing the axis, instead of querying them after drawing the axis. Then you can use the line=
option of mtext3d
to control the distance of the tick labels from the axis like this:
require(rgl)
rgl.close()
x <- rnorm(5)
y <- rnorm(5)
z <- rnorm(5)
open3d()
plot3d(x,y,z,axes=F,xlab="",ylab="",zlab="")
par3d(ignoreExtent=TRUE)
par3d(FOV=0)
par3d(userMatrix=rotationMatrix(0,1,0,0))
par3d(zoom=1)
par3d(windowRect=c(580,60,1380,900))
# and here is the trick:
my.ticks <- pretty(y, n=5)
axis3d('y', at=my.ticks, labels=rep("", 5))
mtext3d(paste(my.ticks), at=my.ticks, edge='y', line=.6)
I found that the easiest way to control both the label position and tick length in axis3d is to rewrite the function with a couple of extra parameters ticksize
and lab_dist
added which can be used to overwrite the default values embedded in the function. The default values of ticksize = 0.05
, and lab_dist = 3
reproduce the behaviour of the original axis3d
.
To get smaller ticks and closer labels, you can then call it with eg
axis3('y', nticks=5, labels = FALSE, ticksize = 0.03, lab_dist = 2)
The new function looks like this:
axis3 <- function (edge, at = NULL, labels = TRUE, tick = TRUE, line = 0,
pos = NULL, nticks = 5, ticksize = 0.05, lab_dist = 3, ...)
{
save <- par3d(skipRedraw = TRUE, ignoreExtent = TRUE)
on.exit(par3d(save))
ranges <- rgl:::.getRanges()
edge <- c(strsplit(edge, "")[[1]], "-", "-")[1:3]
coord <- match(toupper(edge[1]), c("X", "Y", "Z"))
if (coord == 2)
edge[1] <- edge[2]
else if (coord == 3)
edge[1:2] <- edge[2:3]
range <- ranges[[coord]]
if (is.null(at)) {
at <- pretty(range, nticks)
at <- at[at >= range[1] & at <= range[2]]
}
if (is.logical(labels)) {
if (labels)
labels <- format(at)
else labels <- NA
}
mpos <- matrix(NA, 3, length(at))
if (edge[1] == "+")
mpos[1, ] <- ranges$x[2]
else mpos[1, ] <- ranges$x[1]
if (edge[2] == "+")
mpos[2, ] <- ranges$y[2]
else mpos[2, ] <- ranges$y[1]
if (edge[3] == "+")
mpos[3, ] <- ranges$z[2]
else mpos[3, ] <- ranges$z[1]
ticksize <- ticksize * (mpos[, 1] - c(mean(ranges$x), mean(ranges$y),
mean(ranges$z)))
ticksize[coord] <- 0
if (!is.null(pos))
mpos <- matrix(pos, 3, length(at))
mpos[coord, ] <- at
x <- c(mpos[1, 1], mpos[1, length(at)])
y <- c(mpos[2, 1], mpos[2, length(at)])
z <- c(mpos[3, 1], mpos[3, length(at)])
if (tick) {
x <- c(x, as.double(rbind(mpos[1, ], mpos[1, ] + ticksize[1])))
y <- c(y, as.double(rbind(mpos[2, ], mpos[2, ] + ticksize[2])))
z <- c(z, as.double(rbind(mpos[3, ], mpos[3, ] + ticksize[3])))
}
result <- c(ticks = segments3d(x, y, z, ...))
if (!all(is.na(labels)))
result <- c(result, labels = text3d(mpos[1, ] + lab_dist * ticksize[1],
mpos[2, ] + lab_dist * ticksize[2],
mpos[3, ] + lab_dist * ticksize[3],
labels, ...))
lowlevel(result)
}
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