JAL-1360 Javadoc/JUnit

[jalview.git] / src / jalview / util / ColorUtils.java

diff --git a/src/jalview/util/ColorUtils.java b/src/jalview/util/ColorUtils.java
index 0d726a2..fd76086 100644 (file)
--- a/src/jalview/util/ColorUtils.java
+++ b/src/jalview/util/ColorUtils.java
@@ -59,29 +59,28 @@ public class ColorUtils
 
   }
 
-/**
-   * Returns a colour three shades darker. 
-   * 
-   * We use darker text to indicate unselected buttons, lighter text for selected. Note you can't 
-   * guarantee that darkerThan/brighterThan undo each other, as they may result in black/white.
+  /**
+   * Returns a colour three shades darker. Note you can't guarantee that
+   * brighterThan reverses this, as darkerThan may result in black.
    * 
    * @param col
    * @return
    */
-  public static Color darkerThan(Color col) {
-         return col.darker().darker().darker();
+  public static Color darkerThan(Color col)
+  {
+    return col == null ? null : col.darker().darker().darker();
   }
 
-/**
-   * Returns a colour three shades brighter. 
+  /**
+   * Returns a colour three shades brighter. Note you can't guarantee that
+   * darkerThan reverses this, as brighterThan may result in white.
    * 
-   * We use darker text to indicate unselected buttons, lighter text for selected. Note you can't 
-   * guarantee that darkerThan/brighterThan undo each other, as they may result in black/white.
    * @param col
    * @return
    */
-  public static Color brighterThan(Color col) {
-         return col.brighter().brighter().brighter();
+  public static Color brighterThan(Color col)
+  {
+    return col == null ? null : col.brighter().brighter().brighter();
   }
 
 }