From ac47e008785140abe585ae1759e8ebde884f60cc Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Enrico=20Cirac=C3=AC?= <eciraci@uci.edu>
Date: Tue, 13 Feb 2024 00:57:25 +0100
Subject: [PATCH] PtsLine.py - Refactor PtsLine class: Add error handling for
 zero slope, transform methods into properties, and redefine as a dataclass

---
 PtsLine.py | 30 +++++++++++++++++++++++++++---
 1 file changed, 27 insertions(+), 3 deletions(-)

diff --git a/PtsLine.py b/PtsLine.py
index 20c21aa..7de9205 100644
--- a/PtsLine.py
+++ b/PtsLine.py
@@ -12,12 +12,12 @@
 class PtsLine:
     """
     Class to compute the equation of a line passing through two points.
-    Note: this class does not check if:
-    - the two points are the same
-    - the two points are aligned [Vertical or Horizontal Line]
     """
     def __init__(self, x_pt1: float, y_pt1: float,
                  x_pt2: float, y_pt2: float) -> None:
+        if x_pt1 == x_pt2 and y_pt1 == y_pt2:
+            raise ValueError("The input points are the same. "
+                             "A line cannot be defined by a single point.")
         self.x_1 = x_pt1
         self.y_1 = y_pt1
         self.x_2 = x_pt2
@@ -31,8 +31,32 @@ def y_val(self, x_pt: float | np.ndarray) -> float | np.ndarray:
 
     def x_val(self, y_pt: float | np.ndarray) -> float | np.ndarray:
         """Return the x coordinate of the line at the given y coordinate."""
+        if self.m_val == 0:
+            return np.inf
         return (y_pt - self.q_val) / self.m_val
 
+    @property
+    def slope(self) -> float:
+        return self.m_val
+
+    @property
+    def intercept(self) -> float:
+        return self.q_val
+
+    @property
+    def distance(self) -> float:
+        return np.sqrt((self.x_2 - self.x_1)**2 + (self.y_2 - self.y_1)**2)
+
+    @property
+    def midpoint(self) -> tuple[float, float]:
+        return (self.x_1 + self.x_2) / 2, (self.y_1 + self.y_2) / 2
+
+    def is_parallel_to(self, other_line: 'PtsLine') -> bool:
+        return np.isclose(self.m_val, other_line.m_val)
+
+    def is_perpendicular_to(self, other_line: 'PtsLine') -> bool:
+        return np.isclose(-1, self.m_val * other_line.m_val)
+
 
 class PtsLineIntersect:
     """