From 7c02b6647a8fdefc78a4804bf43f73c559595960 Mon Sep 17 00:00:00 2001
From: Anson VanDoren <anson.vandoren@gmail.com>
Date: Sun, 28 Feb 2021 17:41:47 -0800
Subject: [PATCH] adds Python implementation of 31 - Depth Charge

---
 31 Depth Charge/python/depth_charge.py | 120 +++++++++++++++++++++++++
 1 file changed, 120 insertions(+)
 create mode 100644 31 Depth Charge/python/depth_charge.py

diff --git a/31 Depth Charge/python/depth_charge.py b/31 Depth Charge/python/depth_charge.py
new file mode 100644
index 00000000..f367962e
--- /dev/null
+++ b/31 Depth Charge/python/depth_charge.py	
@@ -0,0 +1,120 @@
+# Original BASIC version as published in Basic Computer Games (1978)
+# https://www.atariarchives.org/basicgames/showpage.php?page=55
+#
+# Converted to Python by Anson VanDoren in 2021
+
+import math
+import random
+
+
+def show_welcome():
+    # Clear screen. chr(27) is `Esc`, and the control sequence is
+    # initiated by Ctrl+[
+    # `J` is "Erase in Display" and `2J` means clear the entire screen
+    print(chr(27) + "[2J")
+
+    # Show the intro text, centered
+    print("DEPTH CHARGE".center(45))
+    print("Creative Computing  Morristown, New Jersey\n\n".center(45))
+
+
+def get_num_charges():
+    print("Depth Charge game\n")
+    while True:
+        search_area = input("Dimensions of search area? ")
+
+        # Make sure the input is an integer
+        try:
+            search_area = int(search_area)
+            break
+        except ValueError:
+            print("Must enter an integer number. Please try again...")
+
+    num_charges = int(math.log2(search_area)) + 1
+    return search_area, num_charges
+
+
+def ask_for_new_game():
+    answer = input("Another game (Y or N): ")
+    if answer.lower().strip()[0] == 'y':
+        start_new_game()
+    else:
+        print("OK. Hope you enjoyed yourself")
+        exit()
+
+
+def show_shot_result(shot, location):
+    result = "Sonar reports shot was "
+    if shot[1] > location[1]:  # y-direction
+        result += "north"
+    elif shot[1] < location[1]:  # y-direction
+        result += "south"
+    if shot[0] > location[0]:  # x-direction
+        result += "east"
+    elif shot[0] < location[0]:  # x-direction
+        result += "west"
+    if shot[1] != location[1] or shot[0] != location[0]:
+        result += " and "
+
+    if shot[2] > location[2]:
+        result += "too low."
+    elif shot[2] < location [2]:
+        result += "too high."
+    else:
+        result += "depth OK."
+    print(result)
+    return
+
+
+def get_shot_input():
+    while True:
+        raw_guess = input("Enter coordinates: ")
+        try:
+            x, y, z = raw_guess.split()
+        except ValueError:
+            print("Please enter coordinates separated by spaces")
+            print(f"Example: 3 2 1")
+            continue
+        try:
+            x, y, z = [int(num) for num in [x, y, z]]
+            return x, y, z
+        except ValueError:
+            print("Please enter whole numbers only")
+
+
+def play_game(search_area, num_charges):
+    print("\nYou are the captain of the destroyer USS Computer.")
+    print("An enemy sub has been causing you trouble. Your")
+    print(f"mission is to destroy it. You have {num_charges} shots.")
+    print("Specify depth charge explosion point with a")
+    print("trio of numbers -- the first two are the")
+    print("surface coordinates; the third is the depth.")
+    print("\nGood luck!\n")
+
+    # Generate position for submarine
+    a, b, c = [random.randint(0, search_area) for _ in range(3)]
+
+    # Get inputs until win or lose
+    for i in range(num_charges):
+        print(f"\nTrial #{i+1}")
+        x, y, z = get_shot_input()
+
+        if (x, y, z) == (a, b, c):
+            print(f"\nB O O M ! ! You found it in {i+1} tries!\n")
+            ask_for_new_game()
+        else:
+            show_shot_result((x, y, z), (a, b, c))
+
+    # out of shots
+    print("\nYou have been torpedoed! Abandon ship!")
+    print(f"The submarine was at {a} {b} {c}")
+    ask_for_new_game()
+
+
+def start_new_game():
+    search_area, num_charges = get_num_charges()
+    play_game(search_area, num_charges)
+
+
+if __name__ == '__main__':
+    start_new_game()