PS driver

NAME

PS driver - driver to create PostScript files
(drivers)

DESCRIPTION

The PS driver generates a PostScript file from GRASS display commands. The driver is started as 'pseudo' monitor (PS file instead) and when stopped, all output from previously used display commands are written to the PostScript file.

USAGE

Environment variables

Several environment variables effect the operation of the PS driver:

GRASS_PSFILE
name of output file. If it ends with ".eps" an EPS file will be created.

GRASS_PAPER
sets the screen dimensions and margins to fit a standard paper size, see also GRASS_WIDTH, GRASS_HEIGHT.

GRASS_WIDTH
defines the width of the screen, see also GRASS_HEIGHT

GRASS_HEIGHT
defines the height of the screen, see also GRASS_WIDTH

GRASS_TRUECOLOR
if "TRUE", the PS driver generates color output, otherwise monochrome.

GRASS_LANDSCAPE
if "TRUE", the screen is rotated 90 degrees counter-clockwise so that a "landscape" screen fits better on "portrait" paper.

GRASS_PS_HEADER
if "FALSE", the output is appended to any existing file, and no prolog or setup sections are generated.

GRASS_PS_TRAILER
if "FALSE", no trailer section is generated.

Example

Start up the driver
```
         d.mon start=PS
```

Display raster map and vector polygons

         d.rast somerastermap
         d.vect map=somevectormap color=red

Stop the driver subsequently. This will write a file named map.ps to be created in your current directory:
```
         d.mon stop=PS
```

NOTES

The resolution of the PS raster map is defined by the map extents. Use g.region -p to get the number of rows and cols and use the environment variables to set the PS size. If you would like a larger image, multiply both rows and cols by the same whole number to preserve the aspect ratio.

GRASS_TRUECOLOR requires either PostScript level 2 or level 1 plus the colorimage and setrgbcolor operators (this is the case for colour printers which pre-date level 2 PostScript).

Only masked images (d.rast -o, d.rgb -o, d.his -n) require PostScript level 3.

AUTHOR

Glynn Clements, 2007

Last changed: $Date: 2007-08-23 06:39:39 -0700 (Thu, 23 Aug 2007) $

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