Split code into separate class files

openscad_py/point.py

@@ -0,0 +1,152 @@
+
+from typing import Union as TUnion
+from typing import List
+import math
+import numpy as np
+
+EPSILON = 1e-7
+NP_TYPE = np.float_
+
+
+class Point:
+    """Represents a point or vector in arbitrary dimensions"""
+    
+    def __init__(self, coords):
+        self.c = np.array(coords, dtype=NP_TYPE)
+        
+    @classmethod
+    def c(cls, coords: TUnion[list, 'Point']) -> 'Point':
+        """Ensure coords is an instance of Point (idempotent)"""
+        if isinstance(coords, Point):
+            return coords
+        return Point(coords)
+
+    def render(self) -> str:
+        """Render the point into a SCAD script"""
+        return "[" + (",".join([str(c) for c in self.c])) + "]"
+    
+    def render_stl(self) -> str:
+        return " ".join([str(c) for c in self.c])
+
+    def scale(self, x: float) -> 'Point':
+        """Scale the current vector/point by a scalar"""
+        return self.__class__(self.c * x)
+     
+    def add(self, p: 'Point') -> 'Point':
+        assert isinstance(p, Point)
+        assert self.dim() == p.dim()
+        return self.__class__(self.c + p.c)
+    
+    def sub(self, p: 'Point') -> 'Point':
+        assert isinstance(p, Point)
+        assert self.dim() == p.dim()
+        return self.__class__(self.c - p.c)
+    
+    def dim(self) -> int:
+        """Return the number of dimensions"""
+        return self.c.shape[0]
+
+    def is_zero(self) -> bool:
+        """Return whether all coordinates are very close to 0"""
+        return np.all(np.abs(self.c) < EPSILON)
+
+    def length(self) -> float:
+        """Return the length of the vector"""
+        return np.sqrt(np.square(self.c).sum())
+    
+    def norm(self) -> 'Point':
+        l = self.length()
+        if l == 0:
+            raise Exception("normalising 0 vector")
+        return self.__class__(self.c / self.length())
+    
+    def dot(self, p: 'Point') -> float:
+        """Return the dot product"""
+        return np.dot(self.c, p.c)
+    
+    def cross(self, p: 'Point') -> 'Point':
+        """Return the cross product"""
+        assert self.dim() == 3
+        assert p.dim() == 3
+        return Point([
+            self.c[1]*p.c[2] - self.c[2]*p.c[1],
+            self.c[2]*p.c[0] - self.c[0]*p.c[2],
+            self.c[0]*p.c[1] - self.c[1]*p.c[0]
+            
+        ])
+
+    def eq(self, p: 'Point') -> bool:
+        return (self.c == p.c).all()
+    
+    def lt(self, p: 'Point') -> bool:
+        return (self.c < p.c).all()
+
+    def le(self, p: 'Point') -> bool:
+        return (self.c <= p.c).all()
+
+    def gt(self, p: 'Point') -> bool:
+        return (self.c > p.c).all()
+
+    def ge(self, p: 'Point') -> bool:
+        return (self.c >= p.c).all()
+
+    def allclose(self, p: 'Point') -> bool:
+        return self.c.shape == p.c.shape and np.allclose(self.c, p.c)
+    
+    def angle(self, p: 'Point', mode: str = "deg") -> float:
+        """Return the angle between two vectors in degrees or radians"""
+        r = self.dot(p)
+        r = r / self.length() / p.length()
+        r = math.acos(r)
+        if mode == "rad":
+            return r
+        if mode == "deg":
+            return r / math.pi * 180.
+        raise ValueError("Unknown mode")
+    
+    def z_slope(self, mode: str = "deg") -> float:
+        """Return the slope of a vector in degrees or radians"""
+        r = self.c[2] / self.length()
+        r = math.asin(r)
+        if mode == "rad":
+            return r
+        if mode == "deg":
+            return r / math.pi * 180.
+        raise ValueError("Unknown mode")        
+
+    def rotate(self, coords, angle: float) -> 'Point':
+        """Rotate. coords is a list of 2 coordinate indices that we rotate"""
+        assert len(coords) == 2
+        ca, cb = coords
+        s = np.sin(angle / 180. * np.pi)
+        c = np.cos(angle / 180. * np.pi)
+        r = self.clone().reset_cache()
+        r.c[ca] = c * self.c[ca] + s * self.c[cb]
+        r.c[cb] = -s * self.c[ca] + c * self.c[cb]
+        return r
+    
+    # Operator overloading
+
+    def __add__(self, other):
+        return self.add(other)
+
+    def __radd__(self, other):
+        assert isinstance(other, Point)
+        return other.add(self)
+
+    def __sub__(self, other):
+        return self.sub(other)
+
+    def __rsub__(self, other):
+        assert isinstance(other, Point)
+        return other.sub(self)
+
+    def __mul__(self, other):
+        return self.scale(other)
+    
+    def __rmul__(self, other):
+        return self.scale(other)
+    
+    def __neg__(self):
+        return self.scale(-1.)
+