X-Git-Url: http://www2.svjatoslav.eu/gitweb/?p=sixth-3d.git;a=blobdiff_plain;f=src%2Fmain%2Fjava%2Feu%2Fsvjatoslav%2Fsixth%2Fe3d%2Fgeometry%2FPoint3D.java;h=462f310ac3f2e3aad1dcf0fdfcdfe88e9a67bfa0;hp=0b28de2559a4269475bb1afa6df70533e7afc23c;hb=baab2e2c2ad89695293f3136311c585c9a5afed1;hpb=2e7e46514dd35006e9dde07b1959540078292691

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 0b28de2..462f310 100755
--- a/src/main/java/eu/svjatoslav/sixth/e3d/geometry/Point3D.java
+++ b/src/main/java/eu/svjatoslav/sixth/e3d/geometry/Point3D.java
@@ -9,13 +9,16 @@
 
 package eu.svjatoslav.sixth.e3d.geometry;
 
+import static java.lang.Math.cos;
+import static java.lang.Math.sin;
+import static java.lang.Math.sqrt;
+
 /**
- * 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 +73,11 @@ 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 +94,12 @@ 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 +112,11 @@ 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 +186,7 @@ public class Point3D extends Point2D implements Cloneable {
         return this;
     }
 
-    public boolean withinDrawingLimits() {
+    public boolean isVisible() {
 
         if (z > 0)
             return true;