Removed spaces from top-level directory names.

Spaces tend to cause annoyances in a Unix-style shell environment.
This change fixes that.

78_Sine_Wave/python/sinewave.py

@@ -0,0 +1,115 @@
+########################################################
+#
+# Sine Wave
+#
+# From: BASIC Computer Games (1978)
+#       Edited by David H. Ahl
+#
+# "Did you ever go to a computer show and see a bunch of
+#  CRT terminals just sitting there waiting forlornly
+#  for someone to give a demo on them.  It was one of
+#  those moments when I was at DEC that I decided there
+#  should be a little bit of background activity.  And
+#  why not plot with words instead of the usual X's?
+#  Thus SINE WAVE was born and lives on in dozens of
+#  different versions.  At least those CRTs don't look
+#  so lifeless anymore."
+#
+# Original BASIC version by David Ahl
+#
+# Python port by Jeff Jetton, 2019
+#
+########################################################
+
+import math, time
+
+# Constants
+STRINGS = ('Creative', 'Computing') # Text to display
+MAX_LINES = 160
+STEP_SIZE = 0.25 # Number of radians to increase at each
+                 # line. Controls speed of horizontal
+                 # printing movement.
+CENTER = 26      # Controls left edge of "middle" string
+DELAY = 0.05     # Amount of seconds to wait between lines
+
+
+# Display "intro" text
+print("\n                        Sine Wave")
+print("         Creative Computing  Morristown, New Jersey")
+print("\n\n\n\n")
+# "REMarkable program by David Ahl"
+
+
+string_index = 0
+radians = 0
+width = CENTER - 1
+
+# "Start long loop"
+for line_num in range(MAX_LINES):
+    
+    # Get string to display on this line
+    curr_string = STRINGS[string_index]
+    
+    # Calculate how far over to print the text
+    sine = math.sin(radians)
+    padding = int(CENTER + width * sine)
+    print(curr_string.rjust(padding + len(curr_string)))
+
+    # Increase radians and increment our tuple index
+    radians += STEP_SIZE
+    string_index += 1
+    if string_index >= len(STRINGS):
+        string_index = 0
+
+    # Make sure the text doesn't fly by too fast...
+    time.sleep(DELAY)
+
+
+
+########################################################
+#
+# Porting Notes
+#
+#   The original BASIC version hardcoded two words in
+#   the body of the code and then used a sentinel flag
+#   (flipping between 0 and 1) with IF statements to
+#   determine the word to display next.
+#
+#   Here, the words have been moved to a Python tuple,
+#   which is iterated over without any assumptions about
+#   how long it is.  The STRINGS tuple can therefore be
+#   modified to have to program print out any sequence
+#   of any number of lines of text.
+#
+#   Since a modern computer running Python will print
+#   to the screen much more quickly than a '70s-era
+#   computer running BASIC would, a delay component
+#   has been introduced in this version to make the
+#   output more historically accurate.
+#
+#
+# Ideas for Modifications
+#
+#   Ask the user for desired number of lines (perhaps
+#   with an "infinite" option) and/or step size.
+#
+#   Let the user input the text strings to display,
+#   rather than having it pre-defined in a constant.
+#   Calculate an appropriate CENTER based on length of
+#   longest string.
+#
+#   Try changing STINGS so that it only includes a
+#   single string, just like this:
+#
+#       STRINGS = ('Howdy!')
+#
+#   What happens? Why? How would you fix it?
+#
+########################################################
+
+
+            
+        
+    
+
+