12

solutions/12/README.md

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+# 12
+
+Let's navigate!
+
+Reminded me that I had to refresh trigonometry a bit xD
+
+<details>
+  <summary>Solutions</summary>
+  <ol>
+    <li>796</li>
+    <li>39446</li>
+  </ol>
+</details>

solutions/12/python/main.py

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+from os.path import join, dirname
+from typing import List, Optional
+from math import cos, sin, radians, atan2, degrees, sqrt
+
+directions = {
+    'N': 0,
+    'E': 90,
+    'S': 180,
+    'W': 270,
+}
+
+
+class Ship:
+
+    def __init__(self, waypoint=False) -> None:
+        self.x: float = 0
+        self.y: float = 0
+        self.d: int = directions['E']
+
+        self.waypoint = waypoint
+        self.wx: float = 10
+        self.wy: float = 1
+
+    @property
+    def distance(self) -> int:
+        return round(abs(self.x) + abs(self.y))
+
+    def __str__(self) -> str:
+        return f'⛴  X={round(self.x)} Y={round(self.y)} 𒎓={round(self.d)}\t🏴‍☠️ X={round(self.wx)} Y={round(self.wy)}'
+
+    def navigate(self,  amount: int, degree: Optional[int] = None) -> None:
+        if degree == None:
+            if self.waypoint:
+                self.x += self.wx * amount
+                self.y += self.wy * amount
+                return
+            degree = self.d
+        dx = amount * sin(radians(degree))
+        dy = amount * cos(radians(degree))
+        if self.waypoint:
+            self.wx += dx
+            self.wy += dy
+        else:
+            self.x += dx
+            self.y += dy
+
+    def move(self, instruction: str) -> None:
+        cmd: str = instruction[0]
+        amount: int = int(instruction[1:])
+        if cmd in directions:
+            self.navigate(amount, degree=directions[cmd])
+        elif cmd == 'F':
+            self.navigate(amount)
+        else:
+            diff = amount if cmd == 'R' else -amount
+            if self.waypoint:
+                size = sqrt(self.wx**2 + self.wy**2)
+                d = degrees(atan2(self.wy, self.wx))
+                d -= diff
+                self.wx = size * cos(radians(d))
+                self.wy = size * sin(radians(d))
+            else:
+                self.d = (self.d + diff) % 360
+
+    def follow(self, file: str) -> None:
+        instructions = file.strip().split('\n')
+        for instruction in instructions:
+            self.move(instruction)
+
+
+data = join(dirname(__file__), '../data.txt')
+with open(data) as f:
+    txt = f.read()
+
+    ship = Ship()
+    ship.follow(txt)
+    print(ship)
+    print(ship.distance)
+
+    ship = Ship(waypoint=True)
+    ship.follow(txt)
+    print(ship)
+    print(ship.distance)