mirror of
https://github.com/coding-horror/basic-computer-games.git
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d26dbf036a
Spaces tend to cause annoyances in a Unix-style shell environment. This change fixes that.
116 lines
3.3 KiB
Python
116 lines
3.3 KiB
Python
########################################################
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#
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# Sine Wave
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#
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# From: BASIC Computer Games (1978)
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# Edited by David H. Ahl
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#
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# "Did you ever go to a computer show and see a bunch of
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# CRT terminals just sitting there waiting forlornly
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# for someone to give a demo on them. It was one of
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# those moments when I was at DEC that I decided there
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# should be a little bit of background activity. And
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# why not plot with words instead of the usual X's?
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# Thus SINE WAVE was born and lives on in dozens of
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# different versions. At least those CRTs don't look
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# so lifeless anymore."
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#
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# Original BASIC version by David Ahl
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#
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# Python port by Jeff Jetton, 2019
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#
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########################################################
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import math, time
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# Constants
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STRINGS = ('Creative', 'Computing') # Text to display
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MAX_LINES = 160
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STEP_SIZE = 0.25 # Number of radians to increase at each
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# line. Controls speed of horizontal
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# printing movement.
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CENTER = 26 # Controls left edge of "middle" string
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DELAY = 0.05 # Amount of seconds to wait between lines
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# Display "intro" text
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print("\n Sine Wave")
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print(" Creative Computing Morristown, New Jersey")
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print("\n\n\n\n")
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# "REMarkable program by David Ahl"
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string_index = 0
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radians = 0
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width = CENTER - 1
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# "Start long loop"
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for line_num in range(MAX_LINES):
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# Get string to display on this line
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curr_string = STRINGS[string_index]
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# Calculate how far over to print the text
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sine = math.sin(radians)
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padding = int(CENTER + width * sine)
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print(curr_string.rjust(padding + len(curr_string)))
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# Increase radians and increment our tuple index
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radians += STEP_SIZE
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string_index += 1
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if string_index >= len(STRINGS):
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string_index = 0
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# Make sure the text doesn't fly by too fast...
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time.sleep(DELAY)
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########################################################
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#
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# Porting Notes
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#
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# The original BASIC version hardcoded two words in
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# the body of the code and then used a sentinel flag
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# (flipping between 0 and 1) with IF statements to
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# determine the word to display next.
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#
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# Here, the words have been moved to a Python tuple,
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# which is iterated over without any assumptions about
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# how long it is. The STRINGS tuple can therefore be
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# modified to have to program print out any sequence
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# of any number of lines of text.
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#
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# Since a modern computer running Python will print
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# to the screen much more quickly than a '70s-era
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# computer running BASIC would, a delay component
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# has been introduced in this version to make the
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# output more historically accurate.
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#
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#
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# Ideas for Modifications
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#
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# Ask the user for desired number of lines (perhaps
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# with an "infinite" option) and/or step size.
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#
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# Let the user input the text strings to display,
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# rather than having it pre-defined in a constant.
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# Calculate an appropriate CENTER based on length of
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# longest string.
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#
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# Try changing STINGS so that it only includes a
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# single string, just like this:
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#
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# STRINGS = ('Howdy!')
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#
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# What happens? Why? How would you fix it?
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#
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########################################################
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