我正在使用 ggplot2 库并且正在使用 qplot 命令 我知道我可以在 qplot 之后使用以下命令将输出保存为抗锯齿图像文件
ggsave(file="filename.png")
但是我的液晶显示器怎么样？有什么方法可以将显示器上的绘图视为抗锯齿 grpah？
【问题讨论】：
好的，我刚刚检查过了。我之前的评论错了。 help(x11) 提供了很多详细信息——基于 Cairo 的新设备确实具有可用的抗锯齿功能：
x11 包：grDevices R 文档
X 窗口系统图形
说明：
‘X11’ starts a graphics device driver for the X Window System (version 11). This can only be done on machines/accounts that have access to an X server. ‘x11’ is recognized as a synonym for ‘X11’.用法：
X11(display = "", width, height, pointsize, gamma, bg, canvas, fonts, xpos, ypos, title, type, antialias) X11.options(..., reset = FALSE)参数：
[...]
fonts: X11 font description strings into which weight, slant and size will be substituted. There are two, the first for fonts 1 to 4 and the second for font 5, the symbol font. See section ‘Fonts’.[...]
antialias: for cairo types, the typeof anti-aliasing (if any) to be used. One of ‘c("default", "none", "gray", "subpixel")’.[...]
详情：
The defaults for all of the arguments of ‘X11’ are set by ‘X11.options’: the ‘Arguments’ section gives the ‘factory-fresh’ defaults. The initial size and position are only hints, and may not be acted on by the window manager. Also, some systems (especially laptops) are set up to appear to have a screen of a different size to the physical screen. Option ‘type’ selects between two separate devices: R can be built with support for neither, ‘type = "Xlib"’ or both. Where both are available, types ‘"cairo"’ and ‘"nbcairo"’ offer * antialiasing of text and lines. * translucent colours. * scalable text, including to sizes like 4.5 pt. * full support for UTF-8, so on systems with suitable fonts you can plot in many languages on a single figure (and this will work even in non-UTF-8 locales). The output should be locale-independent. ‘type = "nbcairo"’ is the same device as ‘type="cairo"’ without buffering: which is faster will depend on the X11 connection. Both will be slower than ‘type = "Xlib"’, especially on a slow X11 connection as all the rendering is done on the machine running R rather than in the X server. All devices which use an X11 server (including the ‘type = "Xlib"’ versions of bitmap devices such as ‘png’) share internal structures, which means that they must use the same ‘display’ and visual. If you want to change display, first close all such devices.[...还有更多...]
【讨论】：
capabilities() 会得到什么？我在最后有一个 'cairo' TRUE。
在 Windows 上，没有内置的抗锯齿功能。我不知道它是否计划用于未来的版本。您可以从cairoDevice 或Cairo 包中获得基于开罗的图形设备；但是，您需要先安装GTK+：
从http://gladewin32.sourceforge.net/下载并安装Gtk+ 2.12.9 Runtime Environment Revision 2
另一种选择是通过JGR (http://jgr.markushelbig.org/) 使用基于Java 的图形。我认为还有一个基于Qt 的设备正在开发中。
【讨论】：
正如其他人所提到的，R 的内置 Windows 图形设备不做抗锯齿。但是现在很容易安装 Cairo 图形设备。
在 R 控制台：
install.packages('Cairo',,'http://www.rforge.net/')
测试：
plot(rnorm(1000)) # non-antialiased (on Windows)
library('Cairo')
CairoWin()
plot(rnorm(1000)) # antialiased!
【讨论】：
如果您安装了 Cairo（请参阅其他答案），要将其保存为抗锯齿 PNG，只需将您的代码更改为：
ggsave(file="filename.png", type="cairo-png")
如指定here。
但是出于什么目的，您希望“在监视器上将绘图视为抗锯齿图”或“抗锯齿我的绘图窗口”？如果您的意思是在 RStudio 的绘图窗口（选项卡）中，我不确定是否可以这样做，它基本上只是作为预览。我建议您将图表保存到文件中，然后使用此文件显示它或用于任何其他目的。
【讨论】：
type = "cairo"。