commit 7d6bb28e08561f3425e2aff8d26dc0042a2f9897
Author: Sladoje <f.sladojevic@gmail.com>
Date:   Mon Nov 3 21:08:36 2025 +0100

    Initial: compute + game + moon

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..60ad381
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,7 @@
+__pycache__/
+*.pyc
+.venv/
+venv/
+.idea/
+.DS_Store
+Thumbs.db
diff --git a/requirements.txt b/requirements.txt
new file mode 100644
index 0000000..0cb7ff1
--- /dev/null
+++ b/requirements.txt
@@ -0,0 +1 @@
+pygame
diff --git a/src/__init__.py b/src/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/src/compute.py b/src/compute.py
new file mode 100644
index 0000000..dd5eba8
--- /dev/null
+++ b/src/compute.py
@@ -0,0 +1,59 @@
+from typing import List, Sequence
+import math
+
+Matrix = List[List[float]]
+
+def matmul(matrix_a: Matrix, matrix_b: Matrix) -> Matrix:
+    rows_a = len(matrix_a)
+    cols_a = len(matrix_a[0])
+
+    rows_b = len(matrix_b)
+    cols_b = len(matrix_b[0])
+
+    if cols_a != rows_b:
+        raise ValueError("the width of the first matrix ({cols_a}) must be equal to the width of the second matrix ({rows_b})")
+
+    matrix_c = [[0.0] * cols_b for _ in range(rows_a)]
+    for i in range(rows_a):
+        for j in range(cols_b):
+            for k in range(cols_a):
+                matrix_c[i][j] += matrix_a[i][k] * matrix_b[k][j]
+    return matrix_c
+
+def transpose(matrix: Matrix) -> Matrix:
+    rows = len(matrix)
+    cols = len(matrix[0])
+    return [[matrix[i][j] for i in range(rows)] for j in range(cols)]
+
+def rot_2D(theta: float) -> Matrix:
+    import math
+    c = math.cos(theta)
+    s = math.sin(theta)
+    return [[c, -s], [s, c]]
+
+if __name__ == "__main__":
+    matrix_a = [ [ 3, 4, -1, 4 ],
+                 [ -2, 2, 5, 1 ]
+                 ]
+    matrix_b = [ [ 1, 3, -2 ],
+                 [ 2, 5, 1 ],
+                 [ -1, 4, -4 ],
+                 [ 2, 3, 6 ]
+                 ]
+    matrix_c = matmul(matrix_a, matrix_b)
+    print("Ergebnis C = A * B:")
+    for row in matrix_c:
+        print(row)
+
+    m = [
+        [1, 2, 3],
+        [4, 5, 6]
+    ]
+    print("\nTranspose(m):")
+    for row in transpose(m):
+        print(row)
+
+    print("\nRotationsmatrix 90gard (pi/2):")
+    R = rot_2D(math.pi / 2)
+    for row in R:
+        print(row)
diff --git a/src/game.py b/src/game.py
new file mode 100644
index 0000000..cdb9dff
--- /dev/null
+++ b/src/game.py
@@ -0,0 +1,53 @@
+import pygame
+
+class Game:
+
+    def __init__(self, title, fps=60, size=(640, 400)):
+        self.title = title
+        self.fps = fps
+        self.size = size
+        self.clock = pygame.time.Clock()
+        self.dt = 0
+        self.screen = None
+
+    def init_game(self):
+        pygame.init()
+        pygame.display.set_caption(self.title)
+        self.screen = pygame.display.set_mode(self.size)
+
+
+    def game_loop(self):
+        while True:
+            # Berechnung der Zeitdifferenz seit dem letzten Frame
+            self.dt = self.clock.tick(self.fps) / 1000
+            if self.event_handling() == False:
+                break
+            if self.update_game() == False:
+                break
+            self.draw_game()
+
+    def exit_game(self):
+        pygame.quit()
+
+    def event_handling(self):  # bleibt in der Unterklasse unverändert
+        for event in pygame.event.get():
+            if not self.handle_event(event):
+                return False
+        return True
+
+    def handle_event(self, event):  # wird in der Unterklasse überschrieben
+        if event.type == pygame.QUIT:
+            return False
+        return True
+
+    def update_game(self):
+        return True
+
+    def draw_game(self):
+        pygame.display.flip()
+
+    def run(self):
+        self.init_game()
+        self.game_loop()
+        self.exit_game()
+
diff --git a/src/moon.py b/src/moon.py
new file mode 100644
index 0000000..aa4f002
--- /dev/null
+++ b/src/moon.py
@@ -0,0 +1,44 @@
+import pygame
+from .game import Game
+from .compute import rot_2D
+
+class Moon(Game):
+    def __init__(self) -> None:
+        super().__init__("Moon", fps=60, size=(960, 720))
+        # Mittelpunkt
+        self.cx = self.size[0] // 2
+        self.cy = self.size[1] // 2
+        # Zustand
+        self.angle = 0.0               # aktueller Winkel (Radiant)
+        self.angular_speed = 0.7       # Winkelgeschwindigkeit (rad/s)
+        self.orbit = 180               # Bahnradius in Pixeln
+        self.earth_radius = 24
+        self.moon_radius = 10
+
+    def update_game(self) -> bool:
+        # pro Frame Winkel erhöhen: dt = Sekunden seit letztem Frame
+        self.angle += self.angular_speed * self.dt
+        return True
+
+    def _to_screen(self, x: float, y: float) -> tuple[int, int]:
+        # Mathe-y nach oben -> Bildschirm-y nach unten
+        return int(self.cx + x), int(self.cy - y)
+
+    def draw_game(self) -> None:
+        assert self.screen is not None
+        self.screen.fill((0, 0, 0))
+
+        # Erde in der Mitte
+        pygame.draw.circle(self.screen, (40, 120, 255), (self.cx, self.cy), self.earth_radius)
+
+        # Rotationsmatrix und Mondposition: R(angle) * (orbit, 0)
+        R = rot_2D(self.angle)
+        x = R[0][0] * self.orbit + R[0][1] * 0.0
+        y = R[1][0] * self.orbit + R[1][1] * 0.0
+        mx, my = self._to_screen(x, y)
+        pygame.draw.circle(self.screen, (240, 240, 240), (mx, my), self.moon_radius)
+
+        pygame.display.flip()
+
+if __name__ == "__main__":
+    Moon().run()