From f3da0bbe2c31d899156d410f8e75dabb0255efdf Mon Sep 17 00:00:00 2001
From: Svjatoslav Agejenko <svjatoslav@svjatoslav.eu>
Date: Wed, 29 Mar 2023 23:14:54 +0300
Subject: [PATCH] Updated readability of the code.

---
 .../svjatoslav/sixth/e3d/geometry/Circle.java |  9 ++++-
 .../sixth/e3d/geometry/Point2D.java           |  2 ++
 .../sixth/e3d/geometry/Point3D.java           |  2 ++
 .../sixth/e3d/geometry/Polygon.java           | 35 ++++++++++++-------
 4 files changed, 35 insertions(+), 13 deletions(-)

diff --git a/src/main/java/eu/svjatoslav/sixth/e3d/geometry/Circle.java b/src/main/java/eu/svjatoslav/sixth/e3d/geometry/Circle.java
index 6201765..2ac177d 100644
--- a/src/main/java/eu/svjatoslav/sixth/e3d/geometry/Circle.java
+++ b/src/main/java/eu/svjatoslav/sixth/e3d/geometry/Circle.java
@@ -9,7 +9,14 @@ package eu.svjatoslav.sixth.e3d.geometry;
  */
 public class Circle {
 
-    Point2D center;
+    /**
+     * The center of the circle.
+     */
+    Point2D location;
+
+    /**
+     * The radius of the circle.
+     */
     double radius;
 
 }
diff --git a/src/main/java/eu/svjatoslav/sixth/e3d/geometry/Point2D.java b/src/main/java/eu/svjatoslav/sixth/e3d/geometry/Point2D.java
index f2d2603..a6bb6a1 100755
--- a/src/main/java/eu/svjatoslav/sixth/e3d/geometry/Point2D.java
+++ b/src/main/java/eu/svjatoslav/sixth/e3d/geometry/Point2D.java
@@ -8,6 +8,8 @@ import static java.lang.Math.sqrt;
 
 /**
  * Used to represent point in a 2D space or vector.
+ *
+ * @see Point3D
  */
 public class Point2D implements Cloneable {
 
diff --git a/src/main/java/eu/svjatoslav/sixth/e3d/geometry/Point3D.java b/src/main/java/eu/svjatoslav/sixth/e3d/geometry/Point3D.java
index 3b8ad22..440023f 100755
--- a/src/main/java/eu/svjatoslav/sixth/e3d/geometry/Point3D.java
+++ b/src/main/java/eu/svjatoslav/sixth/e3d/geometry/Point3D.java
@@ -10,6 +10,8 @@ import static java.lang.Math.*;
 
 /**
  * Used to represent point in a 3D space or vector.
+ *
+ * @see Point2D
  */
 
 public class Point3D implements Cloneable {
diff --git a/src/main/java/eu/svjatoslav/sixth/e3d/geometry/Polygon.java b/src/main/java/eu/svjatoslav/sixth/e3d/geometry/Polygon.java
index b630ca3..5475bad 100644
--- a/src/main/java/eu/svjatoslav/sixth/e3d/geometry/Polygon.java
+++ b/src/main/java/eu/svjatoslav/sixth/e3d/geometry/Polygon.java
@@ -9,26 +9,37 @@ package eu.svjatoslav.sixth.e3d.geometry;
  */
 public class Polygon {
 
-    private static boolean intersectsLine(final Point2D point, Point2D p1,
-                                          Point2D p2) {
 
-        if (p1.y > p2.y) {
-            final Point2D tmp = p1;
-            p1 = p2;
-            p2 = tmp;
+    /**
+     * Checks if point is on the right side of the line.
+     * @param point point to check
+     * @param lineP1 line start point
+     * @param lineP2 line end point
+     * @return true if point is on the right side of the line
+     */
+    private static boolean intersectsLine(final Point2D point, Point2D lineP1,
+                                          Point2D lineP2) {
+
+        // Sort line points by y coordinate. 
+        if (lineP1.y > lineP2.y) {
+            final Point2D tmp = lineP1;
+            lineP1 = lineP2;
+            lineP2 = tmp;
         }
 
-        if (point.y < p1.y)
+        // Check if point is within line y range.
+        if (point.y < lineP1.y)
             return false;
-        if (point.y > p2.y)
+        if (point.y > lineP2.y)
             return false;
 
-        final double xp = p2.x - p1.x;
-        final double yp = p2.y - p1.y;
+        // Check if point is on the line.
+        final double xp = lineP2.x - lineP1.x;
+        final double yp = lineP2.y - lineP1.y;
 
-        final double yp2 = point.y - p1.y;
+        final double yp2 = point.y - lineP1.y;
 
-        final double crossX = p1.x + ((xp * yp2) / yp);
+        final double crossX = lineP1.x + ((xp * yp2) / yp);
 
         return point.x >= crossX;
 
-- 
2.20.1