Updated copyright

[sixth-3d.git] / src / main / java / eu / svjatoslav / sixth / e3d / geometry / Point3D.java

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 aff475e..3ca7782 100755 (executable)
--- a/src/main/java/eu/svjatoslav/sixth/e3d/geometry/Point3D.java
+++ b/src/main/java/eu/svjatoslav/sixth/e3d/geometry/Point3D.java
@@ -1,21 +1,22 @@
 /*
- * Sixth - System for data storage, computation, exploration and interaction.
- * Copyright ©2012-2016, Svjatoslav Agejenko, svjatoslav@svjatoslav.eu
- * 
+ * Sixth 3D engine. Copyright ©2012-2019, Svjatoslav Agejenko, svjatoslav@svjatoslav.eu
+ *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of version 3 of the GNU Lesser General Public License
  * or later as published by the Free Software Foundation.
+ *
  */
 
 package eu.svjatoslav.sixth.e3d.geometry;
 
+import static java.lang.Math.*;
+
 /**
- * Used to represent point in a 3D space, vector or speed.
+ * Used to represent point in a 3D space or vector.
  */
 
 public class Point3D extends Point2D implements Cloneable {
 
-    public static final Point3D ZERO = new Point3D();
     public double z;
 
     public Point3D() {
@@ -70,6 +71,11 @@ public class Point3D extends Point2D implements Cloneable {
         return this;
     }
 
+    @Override
+    public boolean isZero() {
+        return (x == 0) && (y == 0) && (z == 0);
+    }
+
     public double getAngleXZ(final Point3D anotherPoint) {
         return Math.atan2(x - anotherPoint.x, z - anotherPoint.z);
     }
@@ -86,8 +92,12 @@ public class Point3D extends Point2D implements Cloneable {
         final double yDelta = y - anotherPoint.y;
         final double zDelta = z - anotherPoint.z;
 
-        return Math
-                .sqrt(((xDelta * xDelta) + (yDelta * yDelta) + (zDelta * zDelta)));
+        return sqrt(((xDelta * xDelta) + (yDelta * yDelta) + (zDelta * zDelta)));
+    }
+
+    @Override
+    public double getVectorLength() {
+        return sqrt(((x * x) + (y * y) + (z * z)));
     }
 
     @Override
@@ -100,11 +110,11 @@ public class Point3D extends Point2D implements Cloneable {
 
     public void rotate(final Point3D center, final double angleXZ,
                        final double angleYZ) {
-        final double s1 = Math.sin(angleXZ);
-        final double c1 = Math.cos(angleXZ);
+        final double s1 = sin(angleXZ);
+        final double c1 = cos(angleXZ);
 
-        final double s2 = Math.sin(angleYZ);
-        final double c2 = Math.cos(angleYZ);
+        final double s2 = sin(angleYZ);
+        final double c2 = cos(angleYZ);
 
         x -= center.x;
         y -= center.y;
@@ -174,7 +184,7 @@ public class Point3D extends Point2D implements Cloneable {
         return this;
     }
 
-    public boolean withinDrawingLimits() {
+    public boolean isVisible() {
 
         if (z > 0)
             return true;