X-Git-Url: http://www2.svjatoslav.eu/gitweb/?a=blobdiff_plain;f=src%2Fmain%2Fjava%2Feu%2Fsvjatoslav%2Fsixth%2Fe3d%2Fgeometry%2FPoint3D.java;fp=src%2Fmain%2Fjava%2Feu%2Fsvjatoslav%2Fsixth%2Fe3d%2Fgeometry%2FPoint3D.java;h=e2c9868c0c696f707418dd111c6ec9687de6d6d2;hb=0f7068dde61bcdbee69782182607015132dc1060;hp=54fbd357c07999ba8beaa17438b0f4d0fb2f6a93;hpb=f4f24fac9a22e6f05f6e1115d3a578513fbbd03c;p=sixth-3d.git

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 54fbd35..e2c9868 100755
--- a/src/main/java/eu/svjatoslav/sixth/e3d/geometry/Point3D.java
+++ b/src/main/java/eu/svjatoslav/sixth/e3d/geometry/Point3D.java
@@ -35,16 +35,24 @@ public class Point3D implements Cloneable {
         this.z = z;
     }
 
-    public Point3D(final Point3D parentPoint) {
-        x = parentPoint.x;
-        y = parentPoint.y;
-        z = parentPoint.z;
+    /**
+     * Creates new current point by cloning coordinates from parent point.
+     */
+    public Point3D(final Point3D parent) {
+        x = parent.x;
+        y = parent.y;
+        z = parent.z;
     }
 
-    public Point3D add(final Point3D direction) {
-        x += direction.x;
-        y += direction.y;
-        z += direction.z;
+    /**
+     * Add other point to current point.
+     *
+     * @return current point.
+     */
+    public Point3D add(final Point3D otherPoint) {
+        x += otherPoint.x;
+        y += otherPoint.y;
+        z += otherPoint.z;
         return this;
     }
 
@@ -52,10 +60,10 @@ public class Point3D implements Cloneable {
         return new Point3D(this);
     }
 
-    public Point3D clone(final Point3D source) {
-        x = source.x;
-        y = source.y;
-        z = source.z;
+    public Point3D clone(final Point3D parent) {
+        x = parent.x;
+        y = parent.y;
+        z = parent.z;
         return this;
     }
 
@@ -153,10 +161,15 @@ public class Point3D implements Cloneable {
         this.z = z;
     }
 
-    public Point3D subtract(final Point3D direction) {
-        x -= direction.x;
-        y -= direction.y;
-        z -= direction.z;
+    /**
+     * Subtract other point from current point.
+     *
+     * @return current point.
+     */
+    public Point3D subtract(final Point3D otherPoint) {
+        x -= otherPoint.x;
+        y -= otherPoint.y;
+        z -= otherPoint.z;
         return this;
     }
 
@@ -165,33 +178,45 @@ public class Point3D implements Cloneable {
         return "x:" + x + " y:" + y + " z:" + z;
     }
 
+    /**
+     * @return current point.
+     */
     public Point3D translateX(final double xIncrement) {
         x += xIncrement;
         return this;
     }
 
+    /**
+     * @return current point.
+     */
     public Point3D translateY(final double yIncrement) {
         y += yIncrement;
         return this;
     }
 
+    /**
+     * @return current point.
+     */
     public Point3D translateZ(final double zIncrement) {
         z += zIncrement;
         return this;
     }
 
+    /**
+     * Here we assume that Z coordinate is distance to the viewer.
+     * If Z is positive, then point is in front of the viewer, and therefore it is visible.
+     *
+     * @return point visibility status.
+     */
     public boolean isVisible() {
-
-        if (z > 0)
-            return true;
-
-        // if ((z > 0) && (x > -1000) && (y > -1000) && (x < 2000) && (y <
-        // 2000))
-        // return true;
-
-        return false;
+        return z > 0;
     }
 
+    /**
+     * Resets point to 0 coordinate in X, Y and Z axis.
+     *
+     * @return current point.
+     */
     public Point3D zero() {
         x = 0;
         y = 0;