X-Git-Url: http://www2.svjatoslav.eu/gitweb/?a=blobdiff_plain;f=src%2Fmain%2Fjava%2Feu%2Fsvjatoslav%2Fsixth%2Fe3d%2Fgui%2FTextPointer.java;h=91cd6e696c72f8d35ef2a0aead54e963c2f42b58;hb=HEAD;hp=8ba9f9f171ef20076f3f9c1957b388c17c630918;hpb=316a696bf9db6e8eddf90ef3df5e1119481c0192;p=sixth-3d.git

diff --git a/src/main/java/eu/svjatoslav/sixth/e3d/gui/TextPointer.java b/src/main/java/eu/svjatoslav/sixth/e3d/gui/TextPointer.java
index 8ba9f9f..91cd6e6 100755
--- a/src/main/java/eu/svjatoslav/sixth/e3d/gui/TextPointer.java
+++ b/src/main/java/eu/svjatoslav/sixth/e3d/gui/TextPointer.java
@@ -1,12 +1,27 @@
 /*
- * Sixth 3D engine. Author: Svjatoslav Agejenko. 
+ * Sixth 3D engine. Author: Svjatoslav Agejenko.
  * This project is released under Creative Commons Zero (CC0) license.
  */
 package eu.svjatoslav.sixth.e3d.gui;
 
+import static java.lang.Integer.compare;
+
+/**
+ * A pointer to a character in a text using row and column.
+ * <p>
+ * It can be used to represent a cursor position in a text.
+ * Also, it can be used to represent beginning and end of a selection.
+ */
 public class TextPointer implements Comparable<TextPointer> {
 
+    /**
+     * The row of the character. Starts from 0.
+     */
     public int row;
+
+    /**
+     * The column of the character. Starts from 0.
+     */
     public int column;
 
     public TextPointer() {
@@ -36,18 +51,37 @@ public class TextPointer implements Comparable<TextPointer> {
         return result;
     }
 
+    /**
+     * Compares this pointer to another pointer.
+     *
+     * @param textPointer The pointer to compare to.
+     * @return <ul>
+     *     <li>-1 if this pointer is smaller than the argument pointer.</li>
+     *     <li>0 if they are equal.</li>
+     *     <li>1 if this pointer is bigger than the argument pointer.</li>
+     *     </ul>
+     */
     @Override
     public int compareTo(final TextPointer textPointer) {
 
-        if (textPointer.row > row)
+        if (row < textPointer.row)
             return -1;
-        if (textPointer.row < row)
+        if (row > textPointer.row)
             return 1;
 
-        return Integer.compare(column, textPointer.column);
-
+        return compare(column, textPointer.column);
     }
 
+    /**
+     * Checks if this pointer is between the argument pointers.
+     * <p>
+     * This pointer is considered to be between the pointers if it is bigger or equal to the start pointer
+     * and smaller than the end pointer.
+     *
+     * @param start The start pointer.
+     * @param end   The end pointer.
+     * @return True if this pointer is between the specified pointers.
+     */
     public boolean isBetween(final TextPointer start, final TextPointer end) {
 
         if (start == null)
@@ -56,6 +90,7 @@ public class TextPointer implements Comparable<TextPointer> {
         if (end == null)
             return false;
 
+        // Make sure that start is smaller than end.
         TextPointer smaller;
         TextPointer bigger;
 
@@ -67,8 +102,8 @@ public class TextPointer implements Comparable<TextPointer> {
             bigger = start;
         }
 
+        // Check if this pointer is between the specified pointers.
         return (compareTo(smaller) >= 0) && (bigger.compareTo(this) > 0);
-
     }
 
 }