[英]Can't plot circular points in R using ggplot2
After experimenting with different point sizes and shapes when plotting with ggplot2, I found that I was no longer able to plot circular points. 在用ggplot2绘图时尝试不同的点大小和形状后,我发现我不再能够绘制圆点。 These simple examples illustrate the problem:
这些简单的例子说明了这个问题
# Plot 1 - square points (symbol #15) appear correctly
#
df = data.frame(x = c(1, 2, 3), y = c(4, 5, 6))
g1 <- ggplot(df, aes(x = x, y = y))
g1 <- g1 + geom_point(size = 3, shape = 15)
g1
Plot 1 output: 情节1输出:
# Plot 2 - circular points (symbol #16) appear as diamonds
#
df = data.frame(x = c(1, 2, 3), y = c(4, 5, 6))
g1 <- ggplot(df, aes(x = x, y = y))
g1 <- g1 + geom_point(size = 3, shape = 16)
g1
Plot 2 output: 图2输出:
# Plot 3 - triangular points (symbol #17) appear correctly
#
df = data.frame(x = c(1, 2, 3), y = c(4, 5, 6))
g1 <- ggplot(df, aes(x = x, y = y))
g1 <- g1 + geom_point(size = 3, shape = 17)
g1
Plot 3 output: 图3输出:
# Plot 4 - diamond points (symbol #18) appear correctly
#
df = data.frame(x = c(1, 2, 3), y = c(4, 5, 6))
g1 <- ggplot(df, aes(x = x, y = y))
g1 <- g1 + geom_point(size = 3, shape = 18)
g1
Plot 4 output: 图4输出:
What do I have to do to plot circular points again? 我需要做些什么才能再次绘制圆形点? (I'm running R 3.1.3 and RStudio 0.98.1103 in Windows 7.)
(我在Windows 7中运行R 3.1.3和RStudio 0.98.1103。)
It looks like it has to do with the limited resolution of the RStudioGD()
graphics device. 它看起来与
RStudioGD()
图形设备的有限分辨率有关。 It becomes a non-issue by avoiding the RStudio interface: 通过避免RStudio接口,它成为一个非问题:
g1 <- ggplot(df, aes(x = x, y = y))
g1 <- g1 + geom_point(size = 3)
g1
(from RStudio interface via save image) (来自RStudio界面,通过保存图片)
ggsave(g1, filename = "image.png")
ggsave
gives you more finely-tuned control over graphics parameters, including the height/width, dpi (for raster images, eg. png), and file format. ggsave
为您提供更精细的图形参数控制,包括高度/宽度,dpi(对于光栅图像,例如png)和文件格式。 See the ?ggsave documentation for details. 有关详细信息,请参阅?ggsave文档。
Or alternatively, bump the geom_point
up to size = 4
. 或者,将
geom_point
碰撞到size = 4
。
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