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- HHHHOOOOPPPP((((6666XXXX)))) UUUUNNNNIIIIXXXX SSSSyyyysssstttteeeemmmm VVVV HHHHOOOOPPPP((((6666XXXX))))
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- hop - calculate and display a doily pattern
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- SSSSYYYYNNNNOOOOPPPPSSSSIIIISSSS
- _h_o_p [-AFHLRSZmu][-w width][-h height][-o filename][-C
- colorwheel][-D numdemos][-E exponent][-abcde
- value][-l limit][-p period][-s scale]
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- DDDDEEEESSSSCCCCRRRRIIIIPPPPTTTTIIIIOOOONNNN
- _h_o_p generates and graphically displays a doily-like pattern
- by iterating one of several parametric maps of the plane.
- Maps include use of the square root, sine, logarithmic, and
- linear functions.
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- OOOOPPPPTTTTIIIIOOOONNNNSSSS
- -R Indicates the display will be in the root window. In
- this mode, the default color map will be used and
- no spinning of the color wheel is possible.
-
- -C _n Selects one of many different color wheels to use.
- The default color wheel is a rainbow palette.
-
- -D _n Indicates demo mode. In this mode, the doily will be
- calculated, displayed, and spun. The numeric
- argument indicates the number of successive runs
- (each using different parameters and maps). The
- program exits after the last run.
-
- -w _n Specifies the width of the window. Default is full
- screen.
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- -h _n Specifies the height of the window. Default is full
- screen.
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- -o _f_i_l_e_n_a_m_e
- Specifies the output filename to be used. If the -o
- option is given, this file will automatically be
- written out at the completion of the drawing. If it
- is not specified, a default filename of hop.ppm is
- used and only written if the 'f' or 'F' keys are
- pressed during a run. The format of the output file
- is PPM. The parameters used to calculate the picture
- are included as comments at the beginning of the
- output file.
-
- -u Produces a usage message.
-
- During display, use of the keys +-_a_A_b_B_C_f_F_n_N_r_s_w_W_X?_h_q_Q
- indicates:
-
- (+) Increment minimum color index.
- (+) Decrement minimum color index.
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- Page 1 (printed 7/3/94)
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- (a or A) Use the log function with new parameters
- (b or B) Toggle use of a maximum number of points limit
- (c or C) Clear the window and re-initialize the points
- (d or D) Decrease or increase the delay in color wheel
- spinning
- (f or F) Save the window contents to a PPM format file
- (H) Toggle histogram computation and display
- (j or J) Randomly select which function to use (with
- new parameters)
- (k or K) Use the square root function with new
- parameters
- (l or L) Use the linear function with new parameters
- (m or M) Use the sine function with new parameters
- (n or N) Skip to the next doily (same function or
- different function).
- (r or R) Decrement or increment the histogram algorithm
- index
- (s) Spin the color wheel (toggling direction)
- (S) Stop spinning the color wheel
- (W or w) Increment or decrement the color map index.
- (X) Erase the existing pattern and restart the
- computation and display
- (Q or q) quit
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- AAAAUUUUTTTTHHHHOOOORRRR
- Ronald Joe Record
- The Santa Cruz Operation
- P.O. Box 1900
- Santa Cruz, CA 95061
- rr@sco.com
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- AAAACCCCKKKKNNNNOOOOWWWWLLLLEEEEDDDDGGGGEEEEMMMMEEEENNNNTTTTSSSS
- The original algorithm (square root only) was published in
- the September 1986 Scientific American. Assistance with
- colormaps and spinning color wheels and X was gleaned from
- Hiram Clawson and Stacey Campbell.
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- Page 2 (printed 7/3/94)
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