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## Code Conventions
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- max line length: 88 characters
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- follow PEP 8
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- after creating code: execute "ruff check -fix"
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## Projectstructure
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- sourcecode lies in "src/MatrixMania"
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- test packages, files and functions should start with "test_"
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- test code can be found in "test/test_matrixmania"
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@@ -0,0 +1 @@
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from .compute import matmul, transpose, rot_2d
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"""
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Modul compute.py
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Enthält Funktionen für Matrixoperationen und Rotationen:
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- matmul: Matrixmultiplikation
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- transpose: Transposition einer Matrix
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- rot_2d: 2D-Rotation / Vektorrotation
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- rot_3D: Erzeugung von 3D-Rotationsmatrizen um die x-, y- oder z-Achse
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"""
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from collections.abc import Sequence
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import math
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Number = float | int
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Matrix = Sequence[Sequence[Number]]
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def _to_clean_matrix(matrix: Matrix, name: str = "Matrix") -> list[list[Number]]:
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"""Hilfsfunktion: Validiert die Matrixform und wandelt sie in eine Liste von Listen um."""
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rows = [list(row) for row in matrix]
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if not rows:
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raise ValueError(f"{name} darf nicht leer sein.")
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row_len = len(rows[0])
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if row_len == 0:
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raise ValueError(f"{name} darf keine leeren Zeilen enthalten.")
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if not all(len(row) == row_len for row in rows):
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raise ValueError(f"Alle Zeilen von {name} müssen die gleiche Länge haben.")
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return rows
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def matmul(a: Matrix, b: Matrix) -> list[list[Number]]:
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"""Multipliziert zwei 2D-Matrizen a und b."""
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a_rows = _to_clean_matrix(a, name="Matrix A")
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b_rows = _to_clean_matrix(b, name="Matrix B")
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m = len(a_rows)
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k_a = len(a_rows[0])
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k_b = len(b_rows)
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n = len(b_rows[0])
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if k_a != k_b:
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raise ValueError(
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f"Inkompatible Dimensionen für Matrizenmultiplikation: "
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f"({m}x{k_a}) kann nicht mit ({k_b}x{n}) multipliziert werden."
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)
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result: list[list[Number]] = []
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for i in range(m):
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row: list[Number] = []
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for j in range(n):
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val = sum(a_rows[i][p] * b_rows[p][j] for p in range(k_a))
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row.append(val)
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result.append(row)
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return result
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def transpose(matrix: Matrix) -> list[list[Number]]:
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"""Transponiert eine 2D-Matrix."""
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rows = _to_clean_matrix(matrix, name="Matrix")
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return [list(col) for col in zip(*rows)]
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def rot_2d(matrix_or_vec: Sequence[Number] | Matrix, angle_rad: float | None = None) -> list[Number] | list[
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list[Number]]:
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"""Rotiert entweder einen 2D-Vektor um angle_rad oder eine Matrix um 90 Grad."""
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# Falls als 2D-Vektor aufgerufen: rot_2d([x, y], angle_rad)
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if angle_rad is not None:
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if len(matrix_or_vec) != 2:
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raise ValueError("rot_2d für Vektoren erwartet genau 2 Elemente [x, y].")
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x, y = matrix_or_vec[0], matrix_or_vec[1]
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cos_a = math.cos(angle_rad)
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sin_a = math.sin(angle_rad)
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return [x * cos_a - y * sin_a, x * sin_a + y * cos_a]
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# Falls als Matrix aufgerufen: rot_2d(matrix)
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rows = _to_clean_matrix(matrix_or_vec, name="Matrix")
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return [list(col) for col in zip(*rows[::-1])]
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def rot_3d(angle: float, axis: str) -> list[list[float]]:
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"""Erzeugt eine 3D-Rotationsmatrix für die Rotation um eine gegebene Achse.
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Formeln der Rotationsmatrizen:
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------------------------------
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Rotation um die x-Achse:
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R_x(θ) = [
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[1, 0, 0],
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[0, cos(θ), -sin(θ)],
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[0, sin(θ), cos(θ)]
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]
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Rotation um die y-Achse:
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R_y(θ) = [
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[ cos(θ), 0, sin(θ)],
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[ 0, 1, 0],
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[-sin(θ), 0, cos(θ)]
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]
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Rotation um die z-Achse:
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R_z(θ) = [
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[cos(θ), -sin(θ), 0],
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[sin(θ), cos(θ), 0],
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[ 0, 0, 1]
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]
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Parameters
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----------
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angle : float
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Rotationswinkel θ im Bogenmaß (Radiant).
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axis : str
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Rotationsachse; gültige Werte sind 'x', 'y' oder 'z'.
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Returns
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-------
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list[list[float]]
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Die 3x3-Rotationsmatrix als Liste von Listen.
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Raises
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------
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ValueError
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Wenn ein ungültiger Achsenbezeichner übergeben wird.
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"""
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c = math.cos(angle)
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s = math.sin(angle)
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axis_norm = axis.strip().lower()
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if axis_norm == "x":
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return [
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[1.0, 0.0, 0.0],
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[0.0, c, -s],
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[0.0, s, c],
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]
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elif axis_norm == "y":
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return [
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[c, 0.0, s],
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[0.0, 1.0, 0.0],
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[-s, 0.0, c],
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]
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elif axis_norm == "z":
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return [
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[c, -s, 0.0],
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[s, c, 0.0],
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[0.0, 0.0, 1.0],
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]
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else:
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raise ValueError(f"Ungültige Achse '{axis}'. Gültige Werte sind 'x', 'y' oder 'z'.")
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def project_ortho(
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point: tuple[float, float, float], scale: float = 1
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) -> tuple[float, float]:
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"""Projiziert einen 3D-Punkt orthogonal auf eine 2D-Ebene und skaliert ihn optional.
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Die z-Koordinate wird ignoriert. Die verbleibenden x- und y-Koordinaten
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werden mit dem Skalierungsfaktor multipliziert.
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Parameters
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----------
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point : tuple[float, float, float]
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Die 3D-Koordinaten (x, y, z).
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scale : float, default=1
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Der Skalierungsfaktor.
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Returns
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-------
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tuple[float, float]
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Die projizierten und skalierten 2D-Koordinaten (x * scale, y * scale).
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"""
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x, y, _ = point
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return (float(x * scale), float(y * scale))
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@@ -0,0 +1,146 @@
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#!/usr/bin/env python3
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"""Installiert die Abhängigkeiten aus pyproject.toml in die aktuelle Python-Umgebung.
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Ersatz für "Install requirements" aus PyCharm, wenn das Projekt eine pyproject.toml
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statt einer requirements.txt hat. Kein Build, keine besondere Projektstruktur nötig,
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nur Standardbibliothek (Python >= 3.11).
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Benutzung:
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In PyCharm: Rechtsklick auf diese Datei -> Run 'install_dependencies'
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Im Terminal (venv aktiv): python install_dependencies.py
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Ohne Parameter wird ALLES installiert:
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[project].dependencies + alle [project.optional-dependencies] + alle [dependency-groups]
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Abweichendes Verhalten:
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python install_dependencies.py --extra dev nur Basis + Extra "dev"
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python install_dependencies.py --group test nur Basis + Gruppe "test"
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python install_dependencies.py --no-main --group dev
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python install_dependencies.py --list nur anzeigen, nichts installieren
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python install_dependencies.py --write requirements.txt schreiben statt installieren
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python install_dependencies.py --write -o reqs.txt
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"""
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from __future__ import annotations
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import sys
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if sys.version_info < (3, 11):
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sys.exit("Dieses Skript braucht Python 3.11 oder neuer (tomllib). "
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f"Aktuell: {sys.version.split()[0]}")
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import argparse
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import subprocess
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import tempfile
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import tomllib
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from pathlib import Path
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PROJECT_DIR = Path(__file__).resolve().parent
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def resolve_group(groups: dict, name: str, seen: set[str] | None = None) -> list[str]:
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"""Löst eine Dependency-Group inkl. {include-group = "..."} rekursiv auf."""
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seen = set() if seen is None else seen
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if name in seen:
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raise ValueError(f"Zyklische include-group: {name}")
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if name not in groups:
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raise KeyError(f"Dependency-Group '{name}' nicht gefunden")
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seen.add(name)
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result: list[str] = []
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for entry in groups[name]:
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if isinstance(entry, str):
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result.append(entry)
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elif isinstance(entry, dict) and "include-group" in entry:
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result.extend(resolve_group(groups, entry["include-group"], seen))
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return result
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def collect(data: dict, extras: list[str], groups: list[str], no_main: bool) -> list[str]:
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project = data.get("project", {})
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optional = project.get("optional-dependencies", {})
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dep_groups = data.get("dependency-groups", {})
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deps: list[str] = []
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if not no_main:
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deps.extend(project.get("dependencies", []))
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for extra in extras:
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if extra not in optional:
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raise KeyError(f"Optional-Dependency '{extra}' nicht gefunden")
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deps.extend(optional[extra])
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for group in groups:
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deps.extend(resolve_group(dep_groups, group))
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# Duplikate entfernen, Reihenfolge behalten
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return list(dict.fromkeys(d.strip() for d in deps if d.strip()))
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def main() -> int:
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p = argparse.ArgumentParser(description=__doc__, formatter_class=argparse.RawDescriptionHelpFormatter)
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p.add_argument("-p", "--pyproject", type=Path, default=PROJECT_DIR / "pyproject.toml",
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help="Pfad zur pyproject.toml (Standard: neben diesem Skript)")
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p.add_argument("--extra", action="append", default=None,
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help="nur diese optional-dependencies (mehrfach möglich)")
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p.add_argument("--group", action="append", default=None,
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help="nur diese dependency-groups (mehrfach möglich)")
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p.add_argument("--no-main", action="store_true", help="[project].dependencies weglassen")
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p.add_argument("--list", action="store_true", help="Abhängigkeiten nur anzeigen")
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p.add_argument("--write", action="store_true", help="requirements-Datei schreiben statt installieren")
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p.add_argument("-o", "--output", type=Path, default=PROJECT_DIR / "requirements.txt",
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help="Zieldatei für --write")
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args = p.parse_args()
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if not args.pyproject.exists():
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print(f"{args.pyproject} nicht gefunden", file=sys.stderr)
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return 1
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data = tomllib.loads(args.pyproject.read_text(encoding="utf-8"))
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all_extras = list(data.get("project", {}).get("optional-dependencies", {}))
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all_groups = list(data.get("dependency-groups", {}))
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# Ohne --extra/--group: alles. Mit einem davon: nur das Gewählte.
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selective = args.extra is not None or args.group is not None
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extras = (args.extra or []) if selective else all_extras
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groups = (args.group or []) if selective else all_groups
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try:
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deps = collect(data, extras, groups, args.no_main)
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except (KeyError, ValueError) as e:
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print(f"Fehler: {e.args[0]}", file=sys.stderr)
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print(f" Vorhandene --extra: {', '.join(all_extras) or '(keine)'}", file=sys.stderr)
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print(f" Vorhandene --group: {', '.join(all_groups) or '(keine)'}", file=sys.stderr)
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return 1
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parts = ([] if args.no_main else ["Basis"]) + [f"extra:{e}" for e in extras] + [f"group:{g}" for g in groups]
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print(f"Auswahl: {', '.join(parts) or '(nichts)'}")
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if args.list:
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print("\n".join(deps) or "(keine Abhängigkeiten)")
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return 0
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content = f"# Automatisch erzeugt aus {args.pyproject.name} – nicht von Hand bearbeiten\n" + "\n".join(deps) + "\n"
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if args.write:
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args.output.write_text(content, encoding="utf-8")
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print(f"{len(deps)} Abhängigkeiten -> {args.output}")
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return 0
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if not deps:
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print("Keine Abhängigkeiten gefunden – nichts zu tun.")
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return 0
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if sys.prefix == sys.base_prefix:
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print("WARNUNG: Es ist kein virtuelles Environment aktiv – es wird in die globale "
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f"Python-Installation installiert:\n {sys.prefix}", file=sys.stderr)
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if sys.stdin.isatty() and input("Trotzdem fortfahren? [j/N] ").strip().lower() not in ("j", "ja", "y", "yes"):
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return 1
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with tempfile.NamedTemporaryFile("w", suffix=".txt", delete=False, encoding="utf-8") as tmp:
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tmp.write(content)
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tmp_path = Path(tmp.name)
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try:
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print(f"Installiere {len(deps)} Abhängigkeiten in {sys.prefix}\n")
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return subprocess.call([sys.executable, "-m", "pip", "install", "-r", str(tmp_path)])
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finally:
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tmp_path.unlink(missing_ok=True)
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if __name__ == "__main__":
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raise SystemExit(main())
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@@ -0,0 +1,4 @@
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[project.optional-dependencies]
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dev = ["pytest", "ruff", "pytest-cov"]
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[tool.pytest.ini_options]
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pythonpath = "src"
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@@ -0,0 +1,88 @@
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import math
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import pytest
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from src.MatrixMania.compute import rot_2d, rot_3d
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# --- Tests für rot_2d ---
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def test_rot_2d_vector_valid():
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# 90° Drehung von [1, 0] um den Ursprung -> [0, 1]
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res = rot_2d([1.0, 0.0], math.pi / 2)
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assert math.isclose(res[0], 0.0, abs_tol=1e-9)
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assert math.isclose(res[1], 1.0, abs_tol=1e-9)
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def test_rot_2d_matrix_valid():
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# 90° Drehung im Uhrzeigersinn
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m = [[1, 2], [3, 4]]
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assert rot_2d(m) == [[3, 1], [4, 2]]
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def test_rot_2d_invalid_vector():
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# Vektor mit ungültiger Länge muss ValueError werfen
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with pytest.raises(ValueError):
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rot_2d([1.0, 2.0, 3.0], math.pi)
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# --- Tests für rot_3D ---
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def test_rot_3d_identity():
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# Bei Winkel 0 müssen alle Achsen die Einheitsmatrix liefern
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eye = [
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[1.0, 0.0, 0.0],
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[0.0, 1.0, 0.0],
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[0.0, 0.0, 1.0],
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]
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for axis in ["x", "y", "z"]:
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res = rot_3d(0.0, axis)
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for r in range(3):
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for c in range(3):
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assert math.isclose(res[r][c], eye[r][c], abs_tol=1e-9)
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def test_rot_3d_x_axis():
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# 90° um x-Achse
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res = rot_3d(math.pi / 2, "x")
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expected = [
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[1.0, 0.0, 0.0],
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[0.0, 0.0, -1.0],
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[0.0, 1.0, 0.0],
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]
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for r in range(3):
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for c in range(3):
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assert math.isclose(res[r][c], expected[r][c], abs_tol=1e-9)
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def test_rot_3d_y_axis():
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# 90° um y-Achse
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res = rot_3d(math.pi / 2, "y")
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expected = [
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[0.0, 0.0, 1.0],
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[0.0, 1.0, 0.0],
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[-1.0, 0.0, 0.0],
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]
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for r in range(3):
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for c in range(3):
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assert math.isclose(res[r][c], expected[r][c], abs_tol=1e-9)
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def test_rot_3d_z_axis():
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# 90° um z-Achse
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res = rot_3d(math.pi / 2, "z")
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expected = [
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[0.0, -1.0, 0.0],
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[1.0, 0.0, 0.0],
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[0.0, 0.0, 1.0],
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]
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for r in range(3):
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for c in range(3):
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assert math.isclose(res[r][c], expected[r][c], abs_tol=1e-9)
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def test_rot_3d_invalid_axis():
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# Ungültige Achsenbezeichnung muss ValueError werfen
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with pytest.raises(ValueError):
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rot_3d(math.pi / 2, "w")
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with pytest.raises(ValueError):
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rot_3d(math.pi / 2, "1")
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Reference in new issue
Block a user