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driver — select a graphics driver
driver(driver_name) current_driver=driver()
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) |
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
J.Ph.C.
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