added projection functin

matrixmania/__init__.py

@@ -1 +1 @@
-from .compute import matmul, transpose, rot_2D, rot_3D
+from .compute import matmul, transpose, rot_2D, rot_3D, project_ortho

matrixmania/compute.py

@@ -1,5 +1,5 @@
 import math
-from typing import List
+from typing import List, Tuple
 from tabulate import tabulate
 
 def matmul(matrix_a:List[List[float]], matrix_b:List[List[float]]) -> List[List[float]]:
@@ -80,7 +80,9 @@ def rot_3D(angle: float, axis: str) -> List[List[float]]:
     else:
         raise ValueError("Axis not valid")
 
-
+def project_ortho(point: Tuple[float, float, float], scale: float = 1) -> Tuple[float, float]:
+    point_2D = (point[0] * scale, point[1] * scale)
+    return point_2D
 
 if __name__ == "__main__":
 
@@ -133,3 +135,6 @@ if __name__ == "__main__":
     print("rotation matrix for 90° on the y axis:")
     print(tabulate(R))
 
+    print("Projection:")
+    print(project_ortho((0.5, -0.5, 10), scale=200))  # -> (100, -100)
+

test/test_projection.py

@@ -0,0 +1,10 @@
+from  matrixmania import project_ortho
+
+def test_projection_1():
+    point = (1.0, 2.0, 3.0)
+    assert project_ortho(point) == (1.0, 2.0)
+
+def test_projection_2():
+    point = (1.0, 2.0, 3.0)
+    scale = 100
+    assert project_ortho(point, scale) == (100.0, 200.0)