From 7979e2c8cc9ac7881db28d8b697e48d5f671571f Mon Sep 17 00:00:00 2001
From: Dave LeCompte <tsmaster@gmail.com>
Date: Sun, 28 Feb 2021 21:33:52 -0800
Subject: [PATCH] Port ORBIT to Python

Pretty straightforward port - a huge portion of the code is drawing ASCII art of Earth.

I also took the liberty of deleting unnecessary work to get the argument to math.cos to lie between -180 and 180 degrees. Maybe that was important back in the day.
---
 68 Orbit/python/orbit.py | 163 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 163 insertions(+)
 create mode 100644 68 Orbit/python/orbit.py

diff --git a/68 Orbit/python/orbit.py b/68 Orbit/python/orbit.py
new file mode 100644
index 00000000..66fb6c56
--- /dev/null
+++ b/68 Orbit/python/orbit.py	
@@ -0,0 +1,163 @@
+"""
+ORBIT
+
+Orbital mechanics simulation
+
+Port by Dave LeCompte
+"""
+
+import math
+import random
+
+PAGE_WIDTH = 64
+
+
+def print_centered(msg):
+    spaces = " " * ((PAGE_WIDTH - len(msg)) // 2)
+    print(spaces + msg)
+
+
+def print_instructions():
+    print(
+        """SOMEWHERE ABOVE YOUR PLANET IS A ROMULAN SHIP.
+
+THE SHIP IS IN A CONSTANT POLAR ORBIT.  ITS
+DISTANCE FROM THE CENTER OF YOUR PLANET IS FROM
+10,000 TO 30,000 MILES AND AT ITS PRESENT VELOCITY CAN
+CIRCLE YOUR PLANET ONCE EVERY 12 TO 36 HOURS.
+
+UNFORTUNATELY, THEY ARE USING A CLOAKING DEVICE SO
+YOU ARE UNABLE TO SEE THEM, BUT WITH A SPECIAL
+INSTRUMENT YOU CAN TELL HOW NEAR THEIR SHIP YOUR
+PHOTON BOMB EXPLODED.  YOU HAVE SEVEN HOURS UNTIL THEY
+HAVE BUILT UP SUFFICIENT POWER IN ORDER TO ESCAPE
+YOUR PLANET'S GRAVITY.
+
+YOUR PLANET HAS ENOUGH POWER TO FIRE ONE BOMB AN HOUR.
+
+AT THE BEGINNING OF EACH HOUR YOU WILL BE ASKED TO GIVE AN
+ANGLE (BETWEEN 0 AND 360) AND A DISTANCE IN UNITS OF
+100 MILES (BETWEEN 100 AND 300), AFTER WHICH YOUR BOMB'S
+DISTANCE FROM THE ENEMY SHIP WILL BE GIVEN.
+
+AN EXPLOSION WITHIN 5,000 MILES OF THE ROMULAN SHIP
+WILL DESTROY IT.
+
+BELOW IS A DIAGRAM TO HELP YOU VISUALIZE YOUR PLIGHT.
+
+
+                          90
+                    0000000000000
+                 0000000000000000000
+               000000           000000
+             00000                 00000
+            00000    XXXXXXXXXXX    00000
+           00000    XXXXXXXXXXXXX    00000
+          0000     XXXXXXXXXXXXXXX     0000
+         0000     XXXXXXXXXXXXXXXXX     0000
+        0000     XXXXXXXXXXXXXXXXXXX     0000
+180<== 00000     XXXXXXXXXXXXXXXXXXX     00000 ==>0
+        0000     XXXXXXXXXXXXXXXXXXX     0000
+         0000     XXXXXXXXXXXXXXXXX     0000
+          0000     XXXXXXXXXXXXXXX     0000
+           00000    XXXXXXXXXXXXX    00000
+            00000    XXXXXXXXXXX    00000
+             00000                 00000
+               000000           000000
+                 0000000000000000000
+                    0000000000000
+                         270
+
+X - YOUR PLANET
+O - THE ORBIT OF THE ROMULAN SHIP
+
+ON THE ABOVE DIAGRAM, THE ROMULAN SHIP IS CIRCLING
+COUNTERCLOCKWISE AROUND YOUR PLANET.  DON'T FORGET THAT
+WITHOUT SUFFICIENT POWER THE ROMULAN SHIP'S ALTITUDE
+AND ORBITAL RATE WILL REMAIN CONSTANT.
+
+GOOD LUCK.  THE FEDERATION IS COUNTING ON YOU.
+"""
+    )
+
+
+def get_yes_or_no():
+    while True:
+        response = input().upper()
+        if response == "YES":
+            return True
+        elif response == "NO":
+            return False
+        else:
+            print("PLEASE TYPE 'YES' OR 'NO'")
+
+
+def game_over(is_success):
+    if is_success:
+        print("YOU HAVE SUCCESSFULLY COMPLETED YOUR MISSION.")
+    else:
+        print("YOU HAVE ALLOWED THE ROMULANS TO ESCAPE.")
+    print("ANOTHER ROMULAN SHIP HAS GONE INTO ORBIT.")
+    print("DO YOU WISH TO TRY TO DESTROY IT?")
+
+    return get_yes_or_no()
+
+
+def play_game():
+    rom_angle = random.randint(0, 359)
+    rom_distance = random.randint(100, 300)
+    rom_angular_velocity = random.randint(10, 30)
+    hour = 0
+    while hour < 7:
+        hour += 1
+        print()
+        print()
+        print(f"THIS IS HOUR {hour}, AT WHAT ANGLE DO YOU WISH TO SEND")
+        print("YOUR PHOTON BOMB?")
+
+        bomb_angle = float(input())
+        print("HOW FAR OUT DO YOU WISH TO DETONATE IT?")
+        bomb_distance = float(input())
+        print()
+        print()
+
+        rom_angle = (rom_angle + rom_angular_velocity) % 360
+        angular_difference = rom_angle - bomb_angle
+        c = math.sqrt(
+            rom_distance ** 2
+            + bomb_distance ** 2
+            - 2
+            * rom_distance
+            * bomb_distance
+            * math.cos(math.radians(angular_difference))
+        )
+
+        print(f"YOUR PHOTON BOMB EXPLODED {c:.4f}*10^2 MILES FROM THE")
+        print("ROMULAN SHIP.")
+
+        if c <= 50:
+            # Destroyed the Romulan
+            return True
+
+    # Ran out of time
+    return False
+
+
+def main():
+    print_centered("ORBIT")
+    print_centered("CREATIVE COMPUTING  MORRISTOWN, NEW JERSEY")
+    print()
+    print()
+    print()
+
+    print_instructions()
+
+    while True:
+        success = play_game()
+        again = game_over(success)
+        if not again:
+            return
+
+
+if __name__ == "__main__":
+    main()