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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.
102 lines
3.2 KiB
Ruby
102 lines
3.2 KiB
Ruby
#!/bin/env ruby
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# Bunny - Print a large ASCII-pixel bunny icon made up of the letters
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# of the word BUNNY.
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# This is a recreation of bunny.bas in Ruby that attempts to remain
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# relatively faithful to the design of the original program.
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#
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# The BASIC version works by storing the image as a series of pairs of
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# numbers containing ranges of text columns that will need to be
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# filled in with non-blank characters.
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#
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# For example, the first few entries in the block of DATA statements are:
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#
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# 1,2,-1,0,2,45,50,-1 ...
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#
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# * 1,2 means "write letters from columns 1 to 2
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# * -1 starts a new line
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# * 0,2 draws letters between columns 0 and 2
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# * 45,50 draws letters between columns 45 and 50
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# * -1 starts a new line
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#
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# ...and so on.
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#
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# We keep the data statements as they are and redraw the image using
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# them. (Well, we drop the last one because it's the end-of-data flag
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# and Ruby is perfectly effective at finding the end of the list.)
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#
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# One tricky bit: BASIC has a function called 'tab()' which sets the
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# output column to the given position and which the BASIC version uses
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# to pick the columns to write to. Ruby doesn't have an equivalent
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# feature (well, not without a *lot* more complexity). Fortunately,
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# the data always draws from left to right so we just keep track of
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# the last column written to and then add some spaces to advance to
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# where we need to be.
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#
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# Do the thing. (We put it in a function to keep from spewing global
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# variables all over the place. It's not really necessary here but
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# it's good practice.)
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def main
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# Print the heading. Note the highly advanced lower-case letters.
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puts ' '*33 + "Bunny"
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puts ' '*15 + "Creative Computing Morristown, New Jersey"
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# Print blank lines.
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print "\n\n\n"
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# The positions to write; this is ripped from the BASIC program's
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# DATA statements.
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positions = [
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1,2,-1,0,2,45,50,-1,0,5,43,52,-1,0,7,41,52,-1,
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1,9,37,50,-1,2,11,36,50,-1,3,13,34,49,-1,4,14,32,48,-1,
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5,15,31,47,-1,6,16,30,45,-1,7,17,29,44,-1,8,19,28,43,-1,
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9,20,27,41,-1,10,21,26,40,-1,11,22,25,38,-1,12,22,24,36,-1,
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13,34,-1,14,33,-1,15,31,-1,17,29,-1,18,27,-1,
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19,26,-1,16,28,-1,13,30,-1,11,31,-1,10,32,-1,
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8,33,-1,7,34,-1,6,13,16,34,-1,5,12,16,35,-1,
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4,12,16,35,-1,3,12,15,35,-1,2,35,-1,1,35,-1,
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2,34,-1,3,34,-1,4,33,-1,6,33,-1,10,32,34,34,-1,
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14,17,19,25,28,31,35,35,-1,15,19,23,30,36,36,-1,
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14,18,21,21,24,30,37,37,-1,13,18,23,29,33,38,-1,
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12,29,31,33,-1,11,13,17,17,19,19,22,22,24,31,-1,
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10,11,17,18,22,22,24,24,29,29,-1,
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22,23,26,29,-1,27,29,-1,28,29,-1,
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]
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# The text we're writing.
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text = "BUNNY"
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# Draw the bunny.
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last_pos = 0
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while positions.size > 0
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first = positions.shift
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# If we've found -1, start a new line
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if first == -1
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puts
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last_pos = 0
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next
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end
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# Advance to start of the range
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print ' '*(first - last_pos)
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last_pos = first
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# Now, draw pixels:
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second = positions.shift
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for i in first .. second
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print text[i % text.size] # choose the letter according to the column
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last_pos += 1
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end
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end
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# Print the final blank line
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puts
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end
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main
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