R轴标记和标记标签之间的rgl距离

我正在使用plot3d（）绘制一些点数据。 我想让我的y轴记号标签稍微靠近我的y轴记号标记

我能想到的最好的办法就是

1） 先绘制数据，不绘制轴

2） 调用axis3d（）绘制y轴和记号，但禁止绘制标签

3） 查询每个记号在三维空间中的当前位置。在向量中存储位置

4） 使用mtext3d（）在基于向量调整的位置添加标签

我在第3步遇到问题。我不知道如何查询每个记号的位置。 par3d（）允许您查询许多图形参数，是否可以使用类似的工具来获取每个y轴刻度的位置

我是不是走错路了？可能吧

下面是一段示例代码，没有为y轴标签添加文本

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))

require（rgl）
一种方法是在绘制轴之前明确定义记号位置，而不是在绘制轴之后查询记号位置。然后，您可以使用
mtext3d
的
line=
选项控制刻度标签与轴的距离，如下所示：

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)

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)
}

require（rgl）
rgl.close（）
x我发现，在axis3d中控制标签位置和记号长度的最简单方法是重写函数，并添加两个额外的参数
ticksize
和
labu dist
，这些参数可用于覆盖函数中嵌入的默认值。默认值
ticksize=0.05
和
lab_dist=3
再现原始
axis3d
的行为

要获得更小的刻度和更接近的标签，您可以使用例如

axis3('y', nticks=5, labels = FALSE, ticksize = 0.03, lab_dist = 2)

新函数如下所示：

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)

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)
}

axis3