R Drawing Font Solutions

Source: Internet
Author: User
Tags cairo cos

A problem often encountered in the COS forum is how Chinese fonts are solved when drawing. Initially, a popular approach is to use family = "GB1" , but generally this makes the diagram more ugly, and does not completely solve the problem. Later found the Cairo bag, Xi Big Ben, but later found that it was not very clear when choosing the font, that is, I do not know how to select the font I want. Then, Winston Chang wrote the Extrafont package, the function is very perfect, but need to install Ghostscript inside the system. I am lazy, do not want to spend time on the configuration Ghostscript, so wrote a called showtext package. (as if it were wrong)

showtextDetailed instructions written in my English blog, four-level vocabulary, very understood. Here is a brief explanation of usage, because the usage is quite simple.

The above picture all the code below, of course, in advance to use the four font files in the working directory.

Library (Showtext) library (Cairo) Font.add ("Newrocker","Newrocker.ttf") Font.add ("aerofoil","Aerofoil.ttf") Font.add ("xkcd","Xkcd.ttf") Font.add ("Nextdoor","Thegirlnextdoor.woff") Cairopng ("Showtext.png", 640, 400) Showtext.begin () plot (1, type ="N", family ="xkcd", Cex.axis = 1.5, Cex.lab = 1.5) Text (1, 1.2,"Showtext 0.2", CeX = 5, family ="Nextdoor", Col="#F8766D") Text (1, 0.8,"Has been released!", CeX = 5, family ="Newrocker", Col="#00BFC4") title ("Free to use fonts", family ="aerofoil", Cex.main = 2) Showtext.end () Dev.off ()

In fact, there are two steps: First font.add() , load the font, and then use showtext.begin() and showtext.end() to include the drawing statements.

font.add()The first parameter is the series name (family) of the font at the time of drawing, which is how to tell R how to reference the font when drawing. The second parameter is the path to the font, and if the font is directly in the working directory, the font name is hit. Of course, the operating system typically has some default font installation locations, which, showtext in fact, are the sysfonts packages it relies on to try to search for these paths. Under Windows, enter directly

Font.add ("songti""simsun.ttc")

You can load the song body.

After the fonts are loaded, R itself does not know how to use them, so the drawing statements need to be contained in a pair and in the showtext.begin() showtext.end() middle. You can use these fonts just by specifying the appropriate family parameters.

showtextWith the Wen Quan Shu of the black font, if you just want to use Chinese in the diagram, only need to load showtext , and then use showtext.begin() and showtext.end() can.

Note that showtext only the currently open graphics device is valid, and if no graphics device is currently present or the device is turned off, showtext it will not work.

showtextDevelopment page in Https://github.com/yixuan/showtext, welcome to there to shoot bricks catch worms. In this message can also, Xie.


The Showtext package was updated to version 0.4-1 the previous two days. Because this update is more content, so simply write a blog introduction.

The first major change is that it can now be used automatically in graphics devices showtext , and is easier to use than ever before. Before this version, you need to turn on the graphics device every time, call showtext.begin() and and showtext.end() then turn off the graphics device. It is cumbersome to call functions repeatedly. In the new version, showtext.auto() all graphics devices are automatically used for rendering as soon as they are called at the very beginning showtext . This is especially important for window devices, as we usually use R to draw, rarely manually windows() or x11() , but rather directly using plot() functions to let r automatically open a window. After the call showtext.auto() , the window device can also automatically use the loaded font, which is useful for previewing the graphics effect.

Another benefit of automatic invocation is that it can be ggsave() used in showtext . It ggsave() automatically turns on and off the graphics device, so we can't insert it in the previous version ggsave() showtext.begin() . Now ggsave() you can also use showtext the font library after automation.

To turn off the auto-Invoke feature, simply execute showtext.auto(FALSE) .

A second notable improvement is the better support for bitmap graphics. In previous versions, it was showtext used primarily for vector diagrams, such as pdf() or svg() . If png() you use it in or jpeg() showtext , you will find that the font you draw is very ugly. This is because those bitmap devices do not have good anti-aliasing support. Now, showtext you can draw a smooth glyph for those devices, so the image quality will be improved as well. The only thing to note is to keep the DPI of the graphics device showtext consistent, such as when using the png() device, you should manually set the desired resolution (here DPI is 120)

= 120)

Support for bitmap graphics also means that Windows devices, such as and, are supported windows() x11() .

The last improvement is actually the previous sysfonts package update content, is currently not directly connected to Google's font library in China, so font.add.google() when used, you can use 360 of the agents provided. The use method is to add a parameter, such as

Library (Showtext) font.add.google ("GoChi Hand""GoChi"  "useso")

Other examples and instructions can be found on Github.

Transferred from: http://yixuan.cos.name/cn/2015/04/showtext-new-version/

R Drawing Font solution (GO)

Contact Us

The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion; products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the content of the page makes you feel confusing, please write us an email, we will handle the problem within 5 days after receiving your email.

If you find any instances of plagiarism from the community, please send an email to: info-contact@alibabacloud.com and provide relevant evidence. A staff member will contact you within 5 working days.

A Free Trial That Lets You Build Big!

Start building with 50+ products and up to 12 months usage for Elastic Compute Service

  • Sales Support

    1 on 1 presale consultation

  • After-Sales Support

    24/7 Technical Support 6 Free Tickets per Quarter Faster Response

  • Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.