R中体积空间中的切片 [英] Slices in volumetric space in R
问题描述
我正在尝试使用两个横截面的表面绘制 plot_ly 曲面图，即将一个曲面映射到 Z 平面，另一个曲面映射到 X 平面.
z 平面上的曲面工作正常，但在另一个平面上添加第二个曲面让我感到困惑.我可能误解了 plot_ly 如何处理数据.
我正在尝试做这样的事情，但我无法从这个情节中获得代码在我自己的 R (RStudio) 中工作
Im trying to make a plot_ly surface plot with two surfaces that cross-section, ie mapping one surface on the Z plane, and another surface mapped on the X plane.
The surface on the z-plane is working fine, but adding a second surface in another plane is tripping me up. I'm probably misunderstanding something about how plot_ly handles data.
I'm trying to do something like this, but I can't get the code from this plot working in my own R (RStudio) https://plot.ly/~schippkus/0/slices-in-volumetric-data/#plot
Here a reproducible example with one-surface working, and the two-surface being odd. The data created in this sample has the same dimensions as the data I am working on. It originally comes in a 3-dimensional array, that I force into this format.
library(plotly); library(tidyverse);
x = 1:91
y = 1:109
z = 1:91
val = as.numeric(scale(sample(length(x)*length(y)*length(z))))
DATA = expand.grid(X=x,Y=y,Z=z) %>% as.data.frame() %>%
mutate(Val = val)
getTrace = function(data,plane,slice){
require(tidyverse)
tmp = data %>% filter(get(plane) %in% slice)
Trace = list(
x = tmp %>% select(X) %>% unique() %>% unlist() %>% unname(),
y = tmp %>% select(Y) %>% unique() %>% unlist() %>% unname(),
z = tmp %>% select(Z) %>% unique() %>% unlist() %>% unname()
)
switch(plane,
"Z"={
oneplane = expand.grid(x = Trace$x, y = Trace$y)
oneplane$z <- tmp %>% select(Val) %>% unlist() %>% unname()
Trace$SurfaceColor = as.matrix(spread(oneplane, key = x, value = z)[, -1]) %>% unname()
Trace$z <- matrix(slice, ncol=ncol(Trace$SurfaceColor), nrow=nrow(Trace$SurfaceColor))
Trace
},
"Y"={
oneplane = expand.grid(x = Trace$x, z = Trace$z)
oneplane$y <- tmp %>% select(Val) %>% unlist() %>% unname()
Trace$SurfaceColor = as.matrix(spread(oneplane, key = z, value = y)[, -1]) %>% unname()
Trace$y <- matrix(slice, ncol=ncol(Trace$SurfaceColor), nrow=nrow(Trace$SurfaceColor))
Trace
},
"X"={
oneplane = expand.grid(y = Trace$y, z = Trace$z)
oneplane$x <- tmp %>% select(Val) %>% unlist() %>% unname()
Trace$SurfaceColor = as.matrix(spread(oneplane, key = y, value = x)[, -1]) %>% unname()
Trace$x <- matrix(slice, ncol=ncol(Trace$SurfaceColor), nrow=nrow(Trace$SurfaceColor))
Trace
}
)
}
Trace1 = getTrace(DATA,"Z",45)
Trace2 = getTrace(DATA,"Y",45)
# This works as intended (except I can't seem to make the surface greyscale)
plot_ly() %>%
add_trace(x=Trace1$x,
y=Trace1$y,
z=Trace1$z,
type="surface",
cauto=T,
surfacecolor=Trace1$SurfaceColor,
colorscale=c("white","black")
) %>%
layout(title="Ok one-surface plot",
scene = list(
aspectratio = list(
x = 91/109,
y = 1,
z = 91/109
),
xaxis = list(
backgroundcolor = "rgb(230, 230,230)",
gridcolor = "rgb(255, 255, 255)",
showbackground = TRUE,
zerolinecolor = "rgb(255, 255, 255)",
range=c(1,91)
),
yaxis = list(
backgroundcolor = "rgb(230, 230,230)",
gridcolor = "rgb(255, 255, 255)",
showbackground = TRUE,
zerolinecolor = "rgb(255, 255, 255)",
range=c(1,109)
),
zaxis = list(
backgroundcolor = "rgb(230, 230,230)",
gridcolor = "rgb(255, 255, 255)",
range = c(1, 91),
showbackground = TRUE,
zerolinecolor = "rgb(255, 255, 255)"
)
))
# This definately does not do as intended
plot_ly() %>%
add_trace(x=Trace1$x,
y=Trace1$y,
z=Trace1$z,
type="surface",
cauto=T,
surfacecolor=Trace1$SurfaceColor,
colorscale=c("white","black")
) %>%
add_trace(x=Trace2$x,
y=Trace2$y,
z=Trace2$z,
type="surface",
cauto=T,
surfacecolor=Trace2$SurfaceColor,
colorscale=c("white","black")
) %>%
layout(title="Bogus plot",
scene = list(
aspectratio = list(
x = 91/109,
y = 1,
z = 91/109
),
xaxis = list(
backgroundcolor = "rgb(230, 230,230)",
gridcolor = "rgb(255, 255, 255)",
showbackground = TRUE,
zerolinecolor = "rgb(255, 255, 255)",
range=c(1,91)
),
yaxis = list(
backgroundcolor = "rgb(230, 230,230)",
gridcolor = "rgb(255, 255, 255)",
showbackground = TRUE,
zerolinecolor = "rgb(255, 255, 255)",
range=c(1,109)
),
zaxis = list(
backgroundcolor = "rgb(230, 230,230)",
gridcolor = "rgb(255, 255, 255)",
range = c(1, 91),
showbackground = TRUE,
zerolinecolor = "rgb(255, 255, 255)"
)
))
In Trace2, z is an integer. And I believe, z in both traces needs to be a matrix in order to work.
> class(Trace2$y)
[1] "matrix"
> class(Trace2$z)
[1] "integer"
So using a simpler example with both z a matrix, it works. In the first matrix, all z values are the same (matrix2 = 6). But in the second, the y values are constant, but the z values are different.
matrix2 <- c(
c(6,6,6,6,6,6),
c(6,6,6,6,6,6),
c(6,6,6,6,6,6),
c(6,6,6,6,6,6)
)
dim(matrix2) <- c(6,4)
x <- c(1,2,3,4,5, 6)
y <- c(1,2,3,4)
rownames(matrix2) <- x
colnames(matrix2) <- y
plot_ly() %>% add_surface(z~matrix2, x= x, y = y)
matrix22 <- c(
c(5,5.5,6,6.5),
c(5,5.5,6,6.5),
c(5,5.5,6,6.5),
c(5,5.5,6,6.5)
)
dim(matrix22) <- c(4,4)
x2 <- c(1,2,3,4)
y2 <- c(3,3,3,3)
rownames(matrix22) <- x2
colnames(matrix22) <- y2
plot_ly() %>% add_surface(z~matrix22, x= x2, y = y2) %>% add_surface(z~matrix2, x= x, y = y)
Gives this:
这篇关于R中体积空间中的切片的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
