driver - select a graphics driver

Calling Sequence

driver(driver_name)

current_driver=driver()

Parameters

• driver_name : string, driver to be selected.

Description

This function is used to select a graphics driver, or with no arguments to get the current graphics driver name. Most of the time, a user can ignore this function and change the driver by calling high level functions such as xbasc or xbasimp. The selected driver can be one of the followings:

"X11" : output to the screen of the computer.

"Pos" : output into Postscript format.

"Rec" : output to the screen of the computer with recording of all the graphics commands. This is the default driver.

"Fig" : output into XFig format. Clipping of objects is not provided in XFig.

"GIF" : output into Gif format based on gd (http://www.boutell.com/gd)

"PPM" : output into PPM format based on gd (http://www.boutell.com/gd)

REMARK

To convert "GIF" or "PPM" files to other image format or for building animation one can use the "convert" program for ImageMagic (http://www.imagemagick.org/)

For example if one has generated a sequence of Gif files named img*.gif it is possible to build an animated Gif file (named anim.gif) by

convert -delay 10  img*.gif anim.gif  
   

See Also

xtape  xbasc  xbasimp  

Author

J.Ph.C.