Create vector3_for_2d_rendering.py

graphics/vector3_for_2d_rendering.py

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+"""
+render 3d points for 2d surfaces.
+"""
+
+import math
+
+__version__ = "2020.9.26"
+__author__ = "xcodz-dot"
+
+
+def convert_to_2d(x: float, y: float, z: float, scale: float,
+                  distance: float) -> (float, float):
+    """
+    Converts 3d point to a 2d drawable point
+
+    >>> convert_to_2d(1.0, 2.0, 3.0, 10.0, 10.0)
+    (7.6923076923076925, 15.384615384615385)
+    """
+    if not all(isinstance(val, (float, int)) for val in locals().values()):
+        raise ValueError("Input values must either be float or int: "
+                         f"{list(locals().values())}")
+    projected_x = ((x * distance) / (z + distance)) * scale
+    projected_y = ((y * distance) / (z + distance)) * scale
+    return projected_x, projected_y
+
+
+def rotate(x: float, y: float, z: float, axis: str,
+           angle: float) -> (float, float, float):
+    """
+    rotate a point around a certain axis with a certain angle
+    angle can be any integer between 1, 360 and axis can be any one of
+    'x', 'y', 'z'
+
+    >>> rotate(1.0, 2.0, 3.0, 'y', 90.0)
+    (3.130524675073759, 2.0, 0.4470070007889556)
+    """
+    if not 0 <= angle <= 360:
+        raise ValueError("Angle is supposed to be in between 0, 360")
+    input_variables = dict(locals())
+    del input_variables["axis"]
+    if not all(isinstance(val, (float, int)) for val in input_variables.values()):
+        raise ValueError("Input values except axis must either be float or int: "
+                         f"{list(input_variables.values())}")
+    if not isinstance(axis, str):
+        raise ValueError("Axis must be a str")
+    angle = angle / 450 * 180 / math.pi
+    if axis == 'z':
+        new_x = x * math.cos(angle) - y * math.sin(angle)
+        new_y = y * math.cos(angle) + x * math.sin(angle)
+        new_z = z
+    elif axis == 'x':
+        new_y = y * math.cos(angle) - z * math.sin(angle)
+        new_z = z * math.cos(angle) + y * math.sin(angle)
+        new_x = x
+    elif axis == 'y':
+        new_x = x * math.cos(angle) - z * math.sin(angle)
+        new_z = z * math.cos(angle) + x * math.sin(angle)
+        new_y = y
+    else:
+        raise ValueError("not a valid axis, choose one of 'x', 'y', 'z'")
+
+    return new_x, new_y, new_z