From 11cb335e459ad8535b8a87deb1a2e36117869754 Mon Sep 17 00:00:00 2001
From: Nils Pukropp <nils@narl.io>
Date: Fri, 15 Dec 2023 06:25:06 +0100
Subject: [PATCH] tut 09

---
 Tutorium/tut09/README.md                      | 514 ++++++++++++++++++
 Tutorium/tut09/img/pointdistribution_ex07.png | Bin 0 -> 20885 bytes
 Tutorium/tut09/img/pointdistribution_ex08.png | Bin 0 -> 18474 bytes
 Tutorium/tut09/src/classes.py                 |  31 ++
 Tutorium/tut09/src/my_collections.py          |  55 ++
 5 files changed, 600 insertions(+)
 create mode 100644 Tutorium/tut09/img/pointdistribution_ex07.png
 create mode 100644 Tutorium/tut09/img/pointdistribution_ex08.png
 create mode 100644 Tutorium/tut09/src/classes.py
 create mode 100644 Tutorium/tut09/src/my_collections.py

diff --git a/Tutorium/tut09/README.md b/Tutorium/tut09/README.md
index e69de29..589718e 100644
--- a/Tutorium/tut09/README.md
+++ b/Tutorium/tut09/README.md
@@ -0,0 +1,514 @@
+---
+marp: true
+paginate: true
+class: invert
+# theme: uncover
+footer: Tutorium 09 - 16.12.2023 - Nils Pukropp - https://s.narl.io/s/tutorium-09
+header: 
+---
+
+# Tutorium 09
+
+Korrektur 08 - Vererbung, OOP, Datenkapselung
+
+---
+
+# Korrektur 08
+
+---
+
+# Punkteverteilung
+
+![](img/pointdistribution_ex08.png)
+
+---
+
+# Häufige Fehler
+
+* `@dataclass` nicht verwendet
+* `__init__` überschrieben, obwohl `@dataclass` das macht und dann `super().__init__()` vergessen
+* Kein Polymorphismus verwendet, also Code Duplikate oder auf `self` gematched/`isinstance()` verwendet
+* Code nicht getestet, Datei nicht ausführbar => **0 Punkte**!
+
+---
+
+# Musterlösung - Aufgabe 8 a,b)
+
+```py
+import math
+from dataclasses import dataclass
+
+
+@dataclass
+class Vec2:
+    x: float
+    y: float
+
+    def abs(self) -> float:
+        return math.sqrt(self.x * self.x + self.y * self.y)
+```
+
+---
+
+# Musterlösung - Aufgabe 8 c)
+
+```py
+@dataclass
+class GameObject:
+    position: Vec2
+    radius: int
+    alive: bool
+    color: tuple[int, int, int]
+
+@dataclass
+class Projectile(GameObject):
+    speed: float
+
+@dataclass
+class StaticObject(GameObject):
+    rotation: float
+```
+
+---
+
+# Musterlösung - Aufgabe 8 c)
+
+```py
+class Item(StaticObject):
+    amount: int
+
+class Ammunition(Item):
+    pass
+
+class Health(Item):
+    pass
+
+class Ship(GameObject):
+    shots: int
+    hp: int
+
+class Asteroid(StaticObject):
+    special: bool
+```
+
+---
+
+# Musterlösung - Aufgabe 8 d)
+
+```python
+class GameObject:
+
+    # ...
+
+    def update(self, width: int, height: int, delta: float):
+        if not (0 <= self.position.x < width and 0 <= self.position.y < height):
+            self.alive = False
+
+class Projectile(GameObject):
+    speed: float
+
+    def update(self, width: int, height: int, delta: float):
+        self.position.y -= delta * self.speed
+        super().update(width, height, delta)
+```
+
+---
+
+# Musterlösung - Aufgabe 8 d)
+
+```python
+class StaticObject(GameObject):
+    rotation: float
+
+    def update(self, width: int, height: int, delta: float):
+        self.position.y += delta
+        self.rotation += delta / self.radius
+        super().update(width, height, delta)
+
+class Ship(GameObject):
+    shots: int
+    hp: int
+
+    def update(self, width: int, height: int, delta: float):
+        if self.hp <= 0:
+            self.hp = 0
+            self.alive = False
+        super().update(width, height, delta)
+```
+
+---
+
+# Musterlösung - Aufgabe 8 e)
+
+```python
+@dataclass
+class GameObject:
+
+    # ...
+
+    def is_colliding(self, other: "GameObject") -> bool:
+        dist = Vec2(self.position.x - other.position.x, self.position.y - other.position.y)
+        return dist.abs() <= self.radius + other.radius
+```
+
+---
+
+# Musterlösung - Aufgabe 8 f)
+
+```python
+class GameObject:
+
+    # ...
+
+    def on_collision(self, other: "GameObject"):
+        pass
+
+class Projectile(GameObject):
+
+    # ...
+
+    def on_collision(self, other: 'GameObject'):
+        if not isinstance(other, Ship):
+            self.alive = False
+```
+
+---
+
+# Musterlösung - Aufgabe 8 f)
+
+```python
+class StaticObject(GameObject):
+
+    # ...
+
+    def on_collision(self, other: 'GameObject'):
+        self.alive = False
+
+class Ship(GameObject):
+    # ...
+    def on_collision(self, other: 'GameObject'):
+        match other:
+            case Asteroid():
+                self.hp -= other.radius
+            case Health():
+                self.hp += other.amount
+            case Ammunition():
+                self.shots += other.amount
+```
+
+---
+
+# Musterlösung - Aufgabe 8 f)
+
+```python
+
+@dataclass
+class Asteroid(StaticObject):
+    special: bool
+
+    def on_collision(self, other: 'GameObject'):
+        if not isinstance(other, Asteroid):
+            self.alive = False
+
+```
+
+---
+
+# Musterlösung - Aufgabe 8 g)
+
+```python
+@dataclass
+class Ship(GameObject):
+
+    # ...
+
+    def shoot(self) -> Projectile:
+        alive = False
+        if self.shots:
+            self.shots -= 1
+            alive = True
+        pos = Vec2(self.position.x, self.position.y)
+        return Projectile(pos, 5, alive, (255, 0, 0), 3)
+```
+
+---
+
+# Musterlösung - Aufgabe 8 h)
+
+```python
+@dataclass
+class GameObject:
+
+    # ...
+
+    def draw(self, screen: pygame.Surface):
+        pygame.draw.circle(screen, self.color, (self.position.x, self.position.y), self.radius)
+```
+
+---
+
+# Override-Dekorator
+
+- ist in `typing`
+- Wird über Methoden geschrieben, die überschrieben werden
+- Pylance zeigt einen Fehler an, wenn die überschriebene Methode in keiner Oberklasse gefunden wird
+- Hilft Fehler vorzubeugen - falsche Signatur, Parameter, ...
+
+---
+
+# Override-Dekorator - Beispiel
+```python
+from typing import override
+from dataclasses import dataclass
+
+
+@dataclass
+class GameObject:
+
+    def on_collision(self, other: 'GameObject'):
+        pass
+
+class StaticObject(GameObject):
+
+    @override
+    def on_collisoin(self, other: 'GameObject'): # Pylance-Error
+        self.alive = False
+```
+---
+
+# Override-Dekorator - Beispiel
+```python
+from typing import override
+from dataclasses import dataclass
+
+
+@dataclass
+class GameObject:
+
+    def on_collision(self, other: 'GameObject'):
+        pass
+
+class StaticObject(GameObject):
+
+    @override
+    def on_collision(self): # Pylance-Error
+        self.alive = False
+```
+
+---
+
+# Datenkapselung
+
+- Man möchte manche Implementierung verstecken
+- Wenn andere deinen Code verwenden, dann möchte man eine Schnittstelle anbieten die intuitiv ist.
+
+```python
+@dataclass
+class MyList[T]:
+    internal_list: list[T] = []
+
+    def add(self, item: T) -> None:
+        self.internal_list += [other]
+```
+---
+# Datenkapselung - warum ist das schlecht?
+
+```python
+from my_collections import MyList
+
+xs = MyList()
+xs.internal_list # ????
+```
+
+- was sollen wir mit `internal_list`?
+- andere sollten nur auf `add()` zugreifen können
+
+---
+
+# Private Attribute
+
+```python
+@dataclass
+class MyList[T]:
+    internal_list: InitVar[list[T]]
+    length: InitVar[int]
+
+    def __init__(self):
+        self.__internal_list = []
+        self.__length = 0
+
+    def add(self, item: T):
+        self.__internal_list += [item]
+        self.__length += 1
+
+    @property
+    def length(self) -> int:
+        return self.__length
+```
+
+---
+
+# Private Attribute
+
+```python
+@dataclass
+class MyList[T]:
+    internal_list: InitVar[list[T]]
+    length: InitVar[int]
+
+    def __init__(self):
+        self.__internal_list = []
+        self.__length = 0
+```
+
+---
+
+# Private Attribute
+
+```python
+@dataclass
+class MyList[T]:
+    internal_list: InitVar[list[T]]
+    length: InitVar[int]
+
+    def __init__(self):
+        self.__internal_list = []
+        self.__length = 0
+
+    def add(self, item: T):
+        self.__internal_list += [item]
+        self.__length += 1
+
+    @property
+    def length(self) -> int:
+        return self.__length
+```
+---
+
+# Private Attribute - Setter
+
+- Manchmal wollen wir trotzdem private Attribute setzen
+- Aber vielleicht nur wenn bestimmte Bedingungen erfüllt sind
+
+```python
+class GameObject:
+    position: InitVar[tuple[int, int]]
+
+    def __post__init__(self, position: tuple[int, int]):
+        assert (0, 0) <= position
+        self.__position = position
+
+    @property
+    def position(self) -> tuple[int, int]:
+        return self.__position
+```
+
+---
+
+# Private Attribute - Setter
+
+```python
+@dataclass
+class GameObject:
+    position: InitVar[tuple[int, int]]
+
+    def __post_init__(self, position: tuple[int, int]):
+        assert (0, 0) > position
+        self.__position = position
+
+    @property
+    def position(self) -> tuple[int, int]:
+        return self.__position
+
+    @position.setter
+    def position(self, position: tuple[int, int]):
+        if (0, 0) > position:
+            return
+        self.__position = position
+```
+
+---
+
+# Comprehensive-Guide to `class`
+
+## `@dataclass`
+
+- Attribute werden im Klassenrumpf definiert
+  - können mit einem Standardwert definiert werden
+- `__init__`, `__post_init__`, `__repr__`, `__eq__`, `__lt__`, `__le__`, `__gt__`, `__ge__`, ... werden automatisch generiert
+- In der Vorlesung benutzen wir nur `dataclass`
+
+---
+
+# Comprehensive-Guide to `class`
+
+## `@dataclass`
+
+- Attribute die im Klassenrumpf definiert werden, werden automatisch in die `__init__` generiert, auch wenn es einen Standardwert gibt!
+
+```python
+@dataclass
+class A:
+    x: int
+    y: int = 0
+
+    def __init__(self, x: int, y: int = 0): # das macht @dataclass von selber!
+        self.x = x
+        self.y = y
+```
+---
+
+# Comprehensive-Guide to `class`
+
+## `Enum`
+
+- Wenn man eine endliche Aufzählung braucht (endliche Menge)
+- macht die Fallunterscheidung einfach weil es endliche Elemente gibt
+- Versichert auch dass kein quatsch übergeben wird wie zb bei `str`
+- **niemals** mit `@dataclass`, sonst geht alles kaputt
+
+---
+
+# Enum - Beispiel
+
+```python
+def eval[T: (int | float)](operator: str, x: T, y: T) -> T:
+    match operator:
+        case '+':
+            return x + y
+        case '-':
+            return x - y
+        case '*':
+            return x * y
+        case '/' if y != 0:
+            return x / y
+        case _:
+            return 0
+```
+
+---
+
+# Enum - Beispiel
+
+```python
+from enum import Enum, auto
+
+class Op(Enum):
+    ADD = auto()
+    SUB = auto()
+    DIV = auto()
+    MUL = auto()
+```
+Jetzt passen wir die Methodensignatur an
+```python
+def eval[T: (int | float)](operator: Op, x: T, y: T) -> T:
+```
+Jetzt kann nichts beliebiges als `operator` übergeben werden
+
+---
+
+# Blatt 09 - Fragen?
+
+- Abgabe: 18.12. - 09:00
+- Testet euren Code!
+- Es gibt keine dummen Fragen wenns ums Verständnis geht
\ No newline at end of file
diff --git a/Tutorium/tut09/img/pointdistribution_ex07.png b/Tutorium/tut09/img/pointdistribution_ex07.png
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diff --git a/Tutorium/tut09/src/classes.py b/Tutorium/tut09/src/classes.py
new file mode 100644
index 0000000..b604a35
--- /dev/null
+++ b/Tutorium/tut09/src/classes.py
@@ -0,0 +1,31 @@
+from dataclasses import dataclass
+
+@dataclass
+class A:
+    x: int
+    y: int = 0
+
+    # die init die von `dataclass` generiert wird, also unnötig
+    # siehe class B
+    def __init__(self, x: int, y: int = 0):
+        self.x = x
+        self.y = y
+        
+@dataclass
+class B:
+    x: int
+    y: int = 0
+   
+if __name__ == '__main__':
+    my_a = A(1)
+    assert my_a.x == 1
+    assert my_a.y == 0
+    my_other_a = A(1, y = 1)
+    assert my_other_a.x == 1
+    assert my_other_a.y == 1
+    my_b = B(1)
+    assert my_b.x == 1
+    assert my_b.y == 0
+    my_other_b = B(1, y = 1)
+    assert my_other_b.x == 1
+    assert my_other_b.y == 1
\ No newline at end of file
diff --git a/Tutorium/tut09/src/my_collections.py b/Tutorium/tut09/src/my_collections.py
new file mode 100644
index 0000000..a8986c0
--- /dev/null
+++ b/Tutorium/tut09/src/my_collections.py
@@ -0,0 +1,55 @@
+from dataclasses import dataclass, InitVar
+
+
+@dataclass
+class MyList[T]:
+    internal_list: InitVar[list[T]]
+    length: InitVar[int]
+    
+    def __init__(self):
+        self.__internal_list = []
+        self.__length = 0
+        
+    def add(self, item: T):
+        self.__internal_list += [item]
+        self.__length += 1
+        
+
+    @property
+    def length(self) -> int:
+        return self.__length
+
+@dataclass
+class GameObject:
+    position: InitVar[tuple[int, int]]
+
+    def __post_init__(self, position: tuple[int, int]):
+        assert (0, 0) <= position
+        self.__position = position
+
+    @property
+    def position(self) -> tuple[int, int]:
+        return self.__position
+
+    @position.setter
+    def position(self, position: tuple[int, int]):
+        if (0, 0) > position:
+            return
+        self.__position = position
+    
+if __name__ == "__main__":
+    xs: MyList[int] = MyList()
+    xs.add(100)
+    assert xs.length == 1
+    position = (0, 0)
+    my_obj = GameObject(position)
+    assert my_obj.position == (0, 0)
+    try:
+        GameObject((0, -1))
+    except AssertionError:
+        pass
+    else:
+        raise AssertionError(f"{my_obj} should have thrown a assertation error")
+    my_obj.position = (-1, 0)
+    assert my_obj.position == (0, 0)
+    
\ No newline at end of file