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XScreenSaver !!!XScreenSaver NAME SYNOPSIS DESCRIPTION OPTIONS NOTES BUGS ENVIRONMENT SEE ALSO DISTRIBUTION POLICY AUTHOR ---- !!NAME bubbles - frying pan / soft drink simulation !!SYNOPSIS __bubbles__ [[-display ''host:display.screen''] [[-foreground ''color''] [[-background ''color''] [[-window] [[-root] [[-mono] [[-install] [[-visual ''visual''] [[-simple] [[-broken] [[-3D] [[-file filename] [[-directory directoryname] !!DESCRIPTION ''Bubbles'' sprays lots of little random bubbles all over the window which then grow until they reach their maximum size and go pop. The inspiration for this was watching little globules of oil on the bottom of a frying pan and it also looks a little like bubbles in fizzy soft drink. The default mode uses fancy ray-traced bubbles but there is also a mode which just draws circles in case the default mode is too taxing on your hardware. !!OPTIONS Depending on how your ''bubbles'' was compiled, it accepts the following options: __-foreground__ Colour of circles if ''-simple'' mode is selected. __-background__ Colour of window background. __-window__ Draw on a newly-created window. This is the default. __-root__ Draw on the root window. __-mono__ If on a color display, pretend we're on a monochrome display. __-install__ Install a private colormap for the window. __-visual__ ''visual'' Specify which visual to use. Legal values are the name of a visual class, or the id number (decimal or hex) of a specific visual. __-delay microseconds__ How much of a delay should be introduced between steps of the animation. Default 1, or about 1 microsecond. Actually, this is the delay between each group of 15 new bubbles since such a delay between each step results in a very slow animation rate. __-nodelay__ Same as ''-delay 0''. __-simple__ Don't use the default fancy pixmap bubbles. Just draw circles instead. This may give more bearable performance if your hardware wasn't made for this sort of thing. __-broken__ Don't hide bubbles when they pop. This was a bug during development but the results were actually quite attractive. (This option is only available if you have the XPM library available and the imake generated Makefile has defined HAVE_XPM). __-3D__ Normally, the simulation is done completely in two dimensions. When a bubble swallows up another bubble, the areas of each are added to get the area of the resulting bubble. This option changes the algorithm to instead add volume (imagining each to be a sphere in 3D space). The whole thing looks more realistic but I find it attracts attention to the flickering of each bubble as they are move and are redrawn. Your mileage may vary. __-file filename__ Use the pixmap definitions in the given file, instead of the default (if one is compiled in). This is ignored if ''-simple'' is specified. If the file is compressed (either with compress or gzip), it is decompressed before use. (This option only works if you have XPM compiled into your binary and you have compiled with BUBBLES_IO set in bubbles.h. This is __not__ the default). __-directory directoryname__ Similar to ''-file'' except the file is taken randomly from the contents of the specified directory. (Again, this option is only available if you have XPM and BUBBLES_IO was set when compiling. See above). __-quiet__ Don't print messages explaining why one or several command line options were ignored. This is disabled by default. !!NOTES If you find the pace of things too slow, remember that there is a delay even though you specify no ''-delay'' option. Try using ''-nodelay'' although beware of the effects of irritation of other users if you're on a shared system as you bleed their CPU time away. Some tools to assist in creation of new bubbles are included in the source distribution. These can either be loaded with the ''-file'' or ''-directory'' options (if available) or they can be used in place of the distributed default bubble (bubble_default.c). You might like to copy these scripts to a permanent location and use them. Read bubbles.README. Rendered bubbles are not supported on monochrome displays. I'm not convinced that small bubbles, even dithered properly are going to look like anything more than a jumble of random dots. !!BUGS There is a delay before something appears on the screen when using rendered bubbles. The XPM library seems to take a __long__ time to make pixmaps out of raw data. This can be irritating on slower systems. The movement of the bubbles looks jerky if an incomplete set of bubbles is used. The hide/display algorithm could do with some work to avoid flickering when ''-nodelay'' is set. !!ENVIRONMENT __DISPLAY__ to get the default host and display number. __XENVIRONMENT__ to get the name of a resource file that overrides the global resources stored in the RESOURCE_MANAGER property. !!SEE ALSO X(1), xscreensaver(1) !!DISTRIBUTION POLICY This work is Copyright 1995, 1996 by James Macnicol. Permission to use, copy, modify, distribute, and sell this software and its documentation for any purpose is hereby granted without fee, provided that the above copyright notice appear in all copies and that both that copyright notice and this permission notice appear in supporting documentation. No representations are made about the suitability of this software for any purpose. It is provided !!AUTHOR James Macnicol ----
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