Section: XScreenSaver manual (6x)
Updated: 5.30 (11-Sep-2014)
xlyap [-BLps][-W width][-H height][-o filename][-a n ] [-b n ] [-w n ] [-h n ] [-i xstart] [-M n ] [-R p ] [-S n ] [-D n ] [-F string][-f string][-r n ] [-O n ] [-C n ] [-c n ] [-m n ] [-x xpos] [-y ypos] [-fps]
During display, pressing any mouse button allows you to select the area to be investigated with the mouse. The upper left hand corner of the desired area is the location of the cursor when the button is pressed. The lower right hand corner is specified by the cursor when the button is released.
Use of the keys bBeEfFkKjJmnrRsSwWxXqQ indicates:
(<) Halve dwell value.
(>) Double dwell value.
([) Halve settle value.
(]) Double settle value.
(B or b) Toggle button display on/off
(E or e) Recalculate the indices into the color wheel using a different method
(F or f) Save current screen to output file (not yet implemented)
(H or h or ?) Display brief help message
(i) Decrement the interval between stripes for the striped color map.
(I) Increment the interval between stripes for the striped color map.
(K) Decrease value exponents are compared against by 0.05.
(J) Increase value exponents are compared against by 0.05.
(M) Decrease value exponents are compared against by 0.005.
(N) Increase value exponents are compared against by 0.005.
(m) Increment the map index, changing the map to be iterated.
(P or p) Toggle positive/negative exponent display.
(r) Redraw the window using previously calculated exponents.
(R) Redraw the window using the newly set dwell and/or settle values.
(S) Spin the color wheel
(s) Halve the length of the spin and spin the color wheel
(u) Go up to the window just prior to the most recent zoom.
(U) Go all the way up to the original window.
(V or v) Display values of various parameters currently in use
(W or w) Use next color map.
(X or x) Clear window
(Q or q) quit
Ronald Joe Record The Santa Cruz Operation P.O. Box 1900 Santa Cruz, CA 95061 firstname.lastname@example.org
The algorithm was taken from the September 1991 Scientific American article by A. K. Dewdney who gives credit to Mario Markus of the Max Planck Institute for its creation. Additional information and ideas were gleaned from the discussion on alt.fractals involving Stephen Hall, Ed Kubaitis, Dave Platt and Baback Moghaddam. Assistance with colormaps and spinning color wheels and X was gleaned from Hiram Clawson. Rubber banding code was adapted from an existing Mandelbrot program written by Stacey Campbell.
Viciously hacked for xscreensaver by Jamie Zawinski, 20-Nov-97.
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