From e6d4274525a236949e6ac87a0dbef68250c01199 Mon Sep 17 00:00:00 2001
From: Tia Lechner <lechner.tia@gmail.com>
Date: Tue, 27 Oct 2026 12:13:33 +0100
Subject: [PATCH] sixth commit: test added

---
 src/matrixmania/__init__.py                   |  2 +-
 src/matrixmania/compute.py                    | 20 ++++++++
 .../test_project_perspective.py               | 48 +++++++++++++++++++
 test/test_matrixmania/test_projection.py      | 21 ++++++++
 4 files changed, 90 insertions(+), 1 deletion(-)
 create mode 100644 test/test_matrixmania/test_project_perspective.py
 create mode 100644 test/test_matrixmania/test_projection.py

diff --git a/src/matrixmania/__init__.py b/src/matrixmania/__init__.py
index c812c86..bcee88e 100644
--- a/src/matrixmania/__init__.py
+++ b/src/matrixmania/__init__.py
@@ -1 +1 @@
-from .compute import matmul, transpose, rot_2D, rot_3D
\ No newline at end of file
+from .compute import matmul, transpose, rot_2D, rot_3D, project_ortho, project_perspective
\ No newline at end of file
diff --git a/src/matrixmania/compute.py b/src/matrixmania/compute.py
index 55d9c96..c65fca6 100644
--- a/src/matrixmania/compute.py
+++ b/src/matrixmania/compute.py
@@ -142,6 +142,26 @@ def rot_3D(angle: float, axis: str) -> list[list[float]]:
         [0, 0, 1],
     ]
 
+def project_ortho(point: tuple[float, float, float], scale: float = 1) -> tuple[float, float]:
+    """Project a 3D point onto a 2D plane using orthogonal projection."""
+    x, y, _z = point
+    return (x * scale, y * scale)
+
+
+def project_perspective(point: tuple[float, float, float],
+                            focal_length: float = 1.0,
+                            scale: float = 1.0,
+                            camera_distance: float = 4.0) -> tuple[float, float]:
+    """Project a 3D point onto a 2D plane using perspective projection."""
+    x, y ,z = point
+    factor = focal_length / (z+camera_distance)
+    x_2d = x * factor * scale
+    y_2d = y * factor * scale
+    return (x_2d, y_2d)
+
+
+
+
 
 if __name__ == "__main__":
 
diff --git a/test/test_matrixmania/test_project_perspective.py b/test/test_matrixmania/test_project_perspective.py
new file mode 100644
index 0000000..bc6ecfe
--- /dev/null
+++ b/test/test_matrixmania/test_project_perspective.py
@@ -0,0 +1,48 @@
+import math
+import pytest
+
+from matrixmania import project_perspective
+
+
+def approx_equal(a: float, b: float, rel_tol: float = 1e-9) -> bool:
+    """Utility to compare two floats with a relative tolerance."""
+    return math.isclose(a, b, rel_tol=rel_tol)
+
+
+@pytest.mark.parametrize(
+    "point,focal_length,scale,expected",
+    [
+        # Case 1 – no scaling, unit focal length
+        (
+            (1.0, 2.0, 3.0),
+            1.0,  # focal_length
+            1.0,  # scale
+            (
+                1.0 / (4.0 + 3.0),  # x projected
+                2.0 / (4.0 + 3.0),  # y projected
+            ),
+        ),
+        # Case 2 – scale 100, focal length 2
+        (
+            (1.0, 2.0, 3.0),
+            2.0,  # focal_length
+            100.0,  # scale
+            (
+                2.0 * 100.0 / (4.0 + 3.0),  # x projected
+                2.0 * 100.0 * 2.0 / (4.0 + 3.0),  # y projected
+            ),
+        ),
+    ],
+)
+def test_project_perspective(point, focal_length, scale, expected):
+    """Test that project_perspective returns the correct 2‑D projection."""
+    # Call the function under test
+    result = project_perspective(point, focal_length=focal_length, scale=scale)
+
+    # Basic sanity checks
+    assert isinstance(result, tuple), "Result should be a tuple"
+    assert len(result) == 2, "Result should contain two coordinates"
+
+    # Confirm values are close to expected (within tiny tolerance)
+    assert approx_equal(result[0], expected[0]), f"X coordinate mismatch: {result[0]} != {expected[0]}"
+    assert approx_equal(result[1], expected[1]), f"Y coordinate mismatch: {result[1]} != {expected[1]}"
\ No newline at end of file
diff --git a/test/test_matrixmania/test_projection.py b/test/test_matrixmania/test_projection.py
new file mode 100644
index 0000000..3a8c7e9
--- /dev/null
+++ b/test/test_matrixmania/test_projection.py
@@ -0,0 +1,21 @@
+from matrixmania import project_ortho
+
+
+def test_projection_point():
+    #Arrange
+    point = (1.0, 2.0, 3.0)
+    expected_value = (1.0, 2.0)
+
+    #Act
+    result = project_ortho(point)
+
+    #Assert
+    assert result == expected_value
+
+def test_projection_scale():
+    point = (1.0, 2.0, 3.0)
+    scale = 100
+    expected_value = (100.0, 200.0)
+
+    result = project_ortho(point, scale)
+    assert result == expected_value