linux - 使用 Gnuplot 时缺少终端 "png"

Question

我使用的是 Xubuntu 13.10，我通过手动编译安装了 gnuplot。但是，当我测试“plot”的功能时，出现了一个错误:

$ python PlotSccDistr.py                            

set terminal png size 1000,800
             ^
"scc.example.plt", line 16: unknown or ambiguous terminal type; type just 'set terminal' for a list

如果我想设置终端 png，但我在列表中找不到“png”:

$ gnuplot

    G N U P L O T
    Version 4.6 patchlevel 5    last modified February 2014
    Build System: Linux x86_64

    Copyright (C) 1986-1993, 1998, 2004, 2007-2014
    Thomas Williams, Colin Kelley and many others

    gnuplot home:     http://www.gnuplot.info
    faq, bugs, etc:   type "help FAQ"
    immediate help:   type "help"  (plot window: hit 'h')

    Terminal type set to 'x11'

gnuplot> set terminal

       canvas  HTML Canvas object
          cgm  Computer Graphics Metafile
      context  ConTeXt with MetaFun (for PDF documents)
        corel  EPS format for CorelDRAW
         dumb  ascii art for anything that prints text
          dxf  dxf-file for AutoCad (default size 120x80)
        eepic  EEPIC -- extended LaTeX picture environment
          emf  Enhanced Metafile format
        emtex  LaTeX picture environment with emTeX specials
     epslatex  LaTeX picture environment using graphicx package
          fig  FIG graphics language for XFIG graphics editor
         gpic  GPIC -- Produce graphs in groff using the gpic preprocessor
      hp2623A  HP2623A and maybe others
       hp2648  HP2648 and HP2647
         hpgl  HP7475 and relatives [number of pens] [eject]
       imagen  Imagen laser printer
        latex  LaTeX picture environment
           mf  Metafont plotting standard
          mif  Frame maker MIF 3.00 format
           mp  MetaPost plotting standard
         pcl5  HP Designjet 750C, HP Laserjet III/IV, etc. (many options)
   postscript  PostScript graphics, including EPSF embedded files (*.eps)
      pslatex  LaTeX picture environment with PostScript \specials
        pstex  plain TeX with PostScript \specials
     pstricks  LaTeX picture environment with PSTricks macros
          qms  QMS/QUIC Laser printer (also Talaris 1200 and others)
        regis  REGIS graphics language
          svg  W3C Scalable Vector Graphics driver
      tek40xx  Tektronix 4010 and others; most TEK emulators
      tek410x  Tektronix 4106, 4107, 4109 and 420X terminals
      texdraw  LaTeX texdraw environment
         tgif  TGIF X11 [mode] [x,y] [dashed] ["font" [fontsize]]
     tkcanvas  Tk/Tcl canvas widget [perltk] [interactive]
         tpic  TPIC -- LaTeX picture environment with tpic \specials
      unknown  Unknown terminal type - not a plotting device
        vttek  VT-like tek40xx terminal emulator
          x11  X11 Window System
         xlib  X11 Window System (gnulib_x11 dump)
        xterm  Xterm Tektronix 4014 Mode

有人可以帮我吗？谢谢!!!

Answer 1

png 终端不可用的原因是它是基于 libgd 的终端以及 jpeg 和 gif。对于这些终端，gnuplot 需要 libgd 版本 >= 2.0。为了使其可用，您必须安装 GD Graphics Library第一:

$ sudo apt-get install libgd2-dev

然后安装 gnuplot 并检查 png 终端是否存在:

gnuplot> set terminal

Available terminal types:
              ...
              gif  GIF images using libgd and TrueType fonts
              ...
             jpeg  JPEG images using libgd and TrueType fonts
              ...
              png  PNG images using libgd and TrueType fonts
              ...