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Chapter 2Tutorial2.1 Installing GLEThis tutorial assumes that GLE is correctly installed. Information about how to install GLE can befound at the following URLs. The GLE distribution also includes a README with brief installationinstructions.• Installation on Windows: http://www.gle-graphics.org/tut/windows.html.• Installation on Linux: http://www.gle-graphics.org/tut/linux.html.• Installation on Mac OS/X: http://www.gle-graphics.org/tut/mac.html.Feel free to post any questions or comments you might have about installing GLE on the GLE mailinglist, which is available here:• Mailing list: https://lists.sourceforge.net/lists/listinfo/glx-general.2.2 Running GLEGLE is essentially a command line application; this tutorial will show you how to run it from the commandprompt. GLE can also be run from your favorite text editor or from QGLE, GLE’s graphical user interface.More information about running GLE from a text editor is given in the installation instructions.On Windows, you run GLE from the Windows Command Prompt. Normally the GLE installer shouldhave added an entry labeled “Command Prompt” to GLE’s folder in the start menu. On Unix-likeoperating systems, GLE runs from an X-terminal, such as “konsole” on Linux / KDE.Once you have opened the command prompt or terminal, try running GLE by entering the followingcommand.gleAs a result, GLE displays the following message.GLE version x.y.zUsage: gle [options] filename.gleMore information: gle -helpIf this message does not appear and you see an error message instead, then GLE is not correctly installed.Refer to the installation instructions (Appendix A.4) for more information. In the following, we will showhow to construct a simple drawing with GLE.2.3 Drawing a Line on a PageLet’s start with drawing a line on the page. GLE needs to know the size of the drawing you wish tomake. This is accomplished with the size command:3
4 CHAPTER 2. TUTORIAL(1, √ 2)Figure 2.1: Result of your first GLE script.size 8 2This specifies that the output will be 8cm wide and 2cm high.moving to somewhere on the page:Next we define a “current point” byamove 0.25 0.25The origin (0,0) is at the bottom left hand corner of the page. Suppose we wish to draw a line from thispoint 5 cm across and 1 cm up:size 8 2amove 0.25 0.25rline 5 1This is a relative movement as the x and y values are given as distances from the current point, alternativelywe could have used absolute coordinates:size 8 2amove 0.25 0.25aline 5.25 1.25To draw some text on the page at the current point, use the write command:write "Hi there"Or, alternatively, you could include arbitrary L A TEX expressions using the tex command:tex "$(1,\sqrt{2})$"Now we have constructed complete GLE script, which looks as follows:size 8 2 boxamove 0.25 0.25rline 5 1tex "$(1,\sqrt{2})$"Enter the above GLE script using a text editor and save it to disk (any editor that saves in UTF8 or ASCIIformat will work). The following assumes that you have saved the file under the name “test.gle” in thefolder C:\GLE on Windows, or /home/john/gle on a Unix-like operating system. Now open a commandprompt and go to the folder where you saved the file. Then, run GLE on the file.On Windows, you do this as follows (C:\> is the prompt):C:\> cd C:\GLEC:\GLE> gle test.gleOr on Unix:cd ~/glegle test.gleGLE produces by default an Encapsulated PostScript (.eps) file:GLE x.y.z [test.gle]-C-R-[test.eps]Try viewing the resulting “test.eps” with a PostScript viewer such as GhostView, and compare it tothe output shown in Fig. 2.1. You can also preview it with QGLE, GLE’s graphical user interface. Afteryou’ve started QGLE, enter the following command at the command prompt.
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Page 42 and 43: 4.3. BAR GRAPHS 37Planet sizesNeptu
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6.9. DEVICE DEPENDEND CONTROL 53fwr
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Chapter 7Advanced FeaturesThis chap
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7.1. DIAGRAMS 57GRVCheeseCHVGoatsMa
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7.2. L A TEX INTERFACE 59house.wind
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7.4. COLOUR 61size 10 5begin clip !
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Chapter 8Surface and Contour Plots8
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8.1. SURFACE PRIMITIVES 65ylines of
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8.2. LETZ 67zclip [min v1 ] [max v2
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8.5. COLOR MAPS 69• pixels-x, pix
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Chapter 9GLE Utilities9.1 FitlsThe
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9.2. MANIP 73c1 == c1c1r1r10 == 1,1
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9.2. MANIP 75BLANK"% BLANK C2C3" Cl
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9.2. MANIP 77PARSUM [range1] [range
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Appendix ATablesA.1 Markerstriangle
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A.2. FUNCTIONS AND VARIABLES 81widt
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A.4. INSTALLING GLE 83A.4 Installin
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A.6. FONT TABLES 85Typewriter (tt)0
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A.6. FONT TABLES 87TEXComputer Mode
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A.6. FONT TABLES 89PostScript Helve
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A.6. FONT TABLES 91(psbl)0246810121
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A.6. FONT TABLES 93PostScript ZapfC
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A.7. PREDEFINED COLORS 95GLE suppor
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Index!, 8, 25\expr(exp), 80.z file,
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INDEX 99histogram, 30horiz, 37horiz
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INDEX 101under, 32underneath, 66Uni
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