我正在尝试使用png格式保存带透明背景的r图。我在stackoverflow中遵循了几个推荐的方法,但每次我仍然得到白色背景。我的考试日期如下:
public class BrowserMenuRenderer : ToolStripProfessionalRenderer
{
public BrowserMenuRenderer() : base(new BrowserColors()) {}
}
public class BrowserColors : ProfessionalColorTable
{
public override Color MenuItemSelected
{
get { return Color.FromArgb(30, 30, 30); }
}
public override Color MenuItemBorder
{
get { return Color.FromArgb(30, 30, 30); }
}
public override Color MenuItemSelectedGradientBegin
{
get { return Color.FromArgb(30, 30, 30); }
}
public override Color MenuItemSelectedGradientEnd
{
get { return Color.FromArgb(30, 30, 30); }
}
}
我尝试了两种方法但都无法删除背景。
方法1:
structure(list(wd = c(7.5, 22.5, 37.5, 52.5, 67.5, 82.5, 97.5,
112.5, 127.5, 142.5, 157.5, 172.5, 187.5, 202.5, 217.5, 232.5,
247.5, 262.5, 277.5, 292.5, 307.5, 322.5, 337.5, 352.5), MP1 = c(17.6,
21, 20.5, 26.5, 32.7, 38.3, 40.7, 41.8, 41.6, 44.4, 52.4, 62.5,
70.7, 74.4, 71.1, 66.9, 66.9, 69.4, 69.4, 67.4, 63.4, 55.9, 43.9,
33.9)), .Names = c("wd", "MP1"), class = "data.frame", row.names = c(NA,
-24L))
方法2:
library(ggplot2)
library(cairo)
ggplot(dat, aes(wd, MP1)) +
coord_polar( start = 0, direction = 1) +
xlab("")+
ylab("")+
scale_x_continuous(limits = c(0, 360), expand = c(0, 0), breaks = seq(0, 360-1, by = 90), labels=c("North", "East","South", "West")) +
geom_vline(xintercept = seq(0, 360-1, by = 15), colour = "grey90", size = 0.2) +
geom_bar(width=15, stat='identity', fill= "cyan", colour= "white") +
theme_bw() +
theme(panel.border = element_blank(),
legend.key = element_blank(),
axis.ticks = element_blank(),
axis.text.y = element_blank(),
axis.text.x = element_blank(),
panel.grid = element_blank())
Cairo(width = 640, height = 480, file="test.png", type="png",
bg = "transparent")
dev.off()
不幸的是,如果我添加到ArcGIS或Microsoft Word文档,这两种方法都不会为我提供透明背景并仍显示白色背景。
我真的很感激任何可能我做错的建议,因为我没有收到任何错误消息但只是没有获得透明背景。非常感谢提前
答案 0 :(得分:9)
基于从@Molx和@aosmith收到的评论,以下答案对我有用,所以我只是发帖,如果有人发现这对他们的工作有用:
ggplot(dat, aes(wd, MP1)) +
coord_polar( start = 0, direction = 1) +
xlab("")+
ylab("")+
scale_x_continuous(limits = c(0, 360), expand = c(0, 0), breaks = seq(0, 360-1, by = 90), labels=c("North", "East","South", "West")) +
geom_vline(xintercept = seq(0, 360-1, by = 15), colour = "grey90", size = 0.2) +
geom_bar(width=15, stat='identity', fill= "cyan", colour= "white") +
theme_bw() +
theme(panel.border = element_blank(),
legend.key = element_blank(),
axis.ticks = element_blank(),
axis.text.y = element_blank(),
axis.text.x = element_blank(),
panel.grid = element_blank(),
panel.grid.minor = element_blank(),
panel.grid.major = element_blank(),
panel.background = element_blank(),
plot.background = element_rect(fill = "transparent",colour = NA))
ggsave("test.png", bg = "transparent")