gganimate:仅在某些帧中存在数据 [英] gganimate: data present only in some frames
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问题描述
我在绘制动画时遇到问题,其中某些图层中的数据仅存在于某些帧中.在下面的示例中,我有一个移动点,可以沿9帧很好地进行动画处理.但是,当我添加仅在某些帧中存在点的另一层时,出现以下错误:
I have a problem animating plots where data in some layers in present only in some of the frames. In the example below, I have a moving point that can be nicely animated along 9 frames. However, when I add another layer with a point present only in some of the frames, I get the following error:
错误:时间数据在所有图层中都必须是同一类
Error: time data must be the same class in all layers
示例:
require(data.table)
require(ggplot2)
require(gganimate)
# 9 points along x=y; present at every time point
dtP1 = data.table(x = 1:9,
y = 1:9,
t = 1:9)
# 3 points along x = 10-y; present at time points 2, 5, 8
dtP2 = data.table(x = c(1, 5, 9),
y = c(9, 5, 1),
t = c(2, 5, 8))
p = ggplot() +
geom_point(data = dtP1,
aes(x = x,
y = y),
color = "#000000") +
geom_point(data = dtP2,
aes(x = x,
y = y),
color = "#FF0000") +
gganimate::transition_time(t) +
gganimate::ease_aes('linear')
pAnim = gganimate::animate(p,
renderer = av_renderer("~/test.mp4"),
fps = 1,
nframes = 9,
height = 400, width = 400)
推荐答案
您可以追加数据表并按如下所示进行调用:
You can append the data tables and call it as shown below:
# 9 points along x=y; present at every time point
dtP1 = data.table(x = 1:9,
y = 1:9,
t = 1:9,
dtp=rep("dtP1",9))
# 3 points along x = 10-y; present at time points 2, 5, 8
dtP2 = data.table(x = c(1, 5, 9),
y = c(9, 5, 1),
t = c(2, 5, 8), dtp=rep("dtP2",3))
dtP <- rbind(dtP1,dtP2)
p = ggplot() +
geom_point(data = dtP,
aes(x = x,
y = y,
color = dtp), size=4) +
gganimate::transition_time(t) +
gganimate::ease_aes('linear')
location <- "C:\\My Disk Space\\_My Work\\RStuff\\GWS\\"
anim_save("usegeom_point2.gif",p,location)
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