[英]r - Using geom_segment with coord_polar
I want to do something similar to the answer in this post , but with geom_segment()
instead of geom_path()
because now I want to add arrows to my lines. 我想做一些类似于这篇文章中的答案,但是使用
geom_segment()
而不是geom_path()
因为现在我想在我的行中添加箭头。
Setup: 建立:
example <- data.frame(r=c(5,4,3),theta=c(0.9,1.1,0.6))
is.linear.polar2 <- function(x) TRUE
coord_polar2 <- coord_polar(theta="y", start = 3/2*pi, direction=-1)
class(coord_polar2) <- c("polar2", class(coord_polar2))
myplot <- ggplot(example, aes(r, theta)) + geom_point(size=3.5) +
scale_x_continuous(breaks=seq(0,max(example$r)), lim=c(0, max(example$r))) +
scale_y_continuous(breaks=round(seq(0, 2*pi, by=pi/4),2), expand=c(0,0), lim=c(0,2*pi)) +
geom_text(aes(label=rownames(example)), size=4.4, hjust=0.5, vjust=-1)
myplot + coord_polar2 + geom_path()
I want a plot that looks like this, but with arrows in the direction of the next point in the sequence. 我想要一个看起来像这样的情节,但箭头指向序列中下一个点的方向。
These are my attempts: 这些是我的尝试:
myplot + coord_polar2 +
geom_segment(data=example,aes(x=r, y=theta, xend=c(tail(r, n=-1), NA),
yend=c(tail(theta, n=-1), NA)),
arrow=arrow(length=unit(0.3,"cm"), type="closed"))
myplot + coord_polar(theta="y", start = 3/2*pi, direction=-1) +
geom_segment(data=example,aes(x=r, y=theta, xend=c(tail(r, n=-1), NA),
yend=c(tail(theta, n=-1), NA)),
arrow=arrow(length=unit(0.3,"cm"), type="closed"))
Well, this solution is even hackier than the answer to your first question. 嗯,这个解决方案甚至比第一个问题的答案还要糟糕 。 Instead of using
geom_segment
I use geom_path
, but this will produce only the last arrow, so we will add the group
aesthetic to connect segments one by one. 而不是使用的
geom_segment
我用geom_path
,但这会产生只有最后一个箭头,所以我们将添加group
唯美的一对一的连接段。 This means our original data frame has to be slightly modified: 这意味着我们的原始数据框架必须稍加修改:
tweak_data <- function(df)
{
if (nrow(df) == 1) return(df)
idx_x2 <- c(1, rep(2:(nrow(df) - 1), each=2), nrow(df))
gr <- rep(seq.int(nrow(df) - 1), each=2)
df_res <- data.frame(r = df$r[idx_x2], theta = df$theta[idx_x2],
label = rownames(df)[idx_x2], group = gr)
df_res
}
example_tw <- tweak_data(example)
myplot2 <- ggplot(example2, aes(r, theta)) + geom_point(size=3.5) +
scale_x_continuous(breaks=seq(0,max(example$r)), lim=c(0, max(example$r))) +
scale_y_continuous(breaks=round(seq(0, 2*pi, by=pi/4), 2),
expand=c(0, 0), lim=c(0, 2*pi)) +
geom_text(aes(label=label), size=4.4, hjust=0.5, vjust=-1)
myplot2 + coord_polar2 +
geom_path(aes(group=group), arrow=arrow(length=unit(0.3,"cm"), type="closed"))
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