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#!/usr/bin/env ruby | |
# USAGE: dnd.rb +0 0d0[+0] [0] | |
# e.g. dnd.rb +0 2d6 | |
# or dnd.rb +5 2d6+6 2 (for 2 attacks per round e.g. flurry) | |
if ARGV.length < 2 | |
puts "ARGS = attk dmg" | |
puts "e.g. +5 2d6+2" | |
exit | |
end | |
atk = ARGV[0] | |
dmg = ARGV[1] | |
apr = ARGV[2].to_i # attacks per round | |
apr = 1 if apr == 0 | |
unless atk =~ /[+-][0-9]+/ | |
puts "Cannot understand atk mod. Try something like +5 or -2" | |
exit | |
end | |
unless dmg =~ /[0-9]+d[0-9]+([+-][0-9]+)*/ | |
puts "Cannot understand dmg mod. Try something like 2d6 or 3d4+6" | |
exit | |
end | |
hitdie = 10.5 + atk.to_f | |
acs = [12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25] | |
print "AC |" | |
acs.each do |ac| | |
print "#{ac.to_s.rjust(6)} |" | |
end | |
puts | |
def hit_prob(atk, ac) | |
(21 + atk.to_f - ac) / 20 | |
end | |
print "HIT |" | |
acs.each do |ac| | |
hitprob = hit_prob(atk, ac) | |
if hitprob > 0 | |
print "#{sprintf('%.2f', hitprob).rjust(6)} |" | |
end | |
end | |
puts | |
dien = dmg[/[0-9]+/].to_f | |
dice = dmg[/d[0-9]+/][1..-1].to_f | |
dmod = dmg[/[+-][0-9]+/].to_f | |
dmg = (dien * (dice.to_i / 2 + 0.5) + dmod) * apr | |
print "D/R |" | |
acs.each do |ac| | |
hitprob = hit_prob(atk, ac) | |
if hitprob > 0 | |
print "#{sprintf('%-.2f', hitprob*dmg.to_f).rjust(6)} |" | |
else | |
print " |" | |
end | |
end | |
puts | |
puts | |
puts "On a hit, avg dmg = #{dmg / apr}" |
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