method to get a user default colour (JAL-234)

diff --git a/src/jalview/bin/Cache.java b/src/jalview/bin/Cache.java
index f77c2f1..09ebadd 100755 (executable)
--- a/src/jalview/bin/Cache.java
+++ b/src/jalview/bin/Cache.java
@@ -17,6 +17,7 @@
  */
 package jalview.bin;
 
+import java.awt.Color;
 import java.io.*;
 import java.util.*;
 
@@ -129,6 +130,8 @@ import org.biojava.dasobert.dasregistry.Das1Source;
  * </li>
  * <li>SHOW_WSDISCOVERY_ERRORS (true) Controls if the web service URL discovery
  * warning dialog box is displayed.</li>
+ * <li>ANNOTATIONCOLOUR_MIN (orange) Shade used for minimum value of annotation when shading by annotation</li>
+ * <li>ANNOTATIONCOLOUR_MAX (red) Shade used for maximum value of annotation when shading by annotation</li>
  * 
  * <li></li>
  * 
@@ -726,4 +729,29 @@ public class Cache
     }
   }
 
+  /**
+   * get the user's default colour if available
+   * @param property
+   * @param defcolour
+   * @return
+   */
+  public static Color getDefaultColour(String property, Color defcolour)
+  {
+    String colprop = getProperty(property);
+    if (colprop==null) {
+      return defcolour;
+    }
+    Color col = jalview.schemes.ColourSchemeProperty.getAWTColorFromName(colprop);
+    if (col==null)
+    {
+      try {
+        col = new jalview.schemes.UserColourScheme(colprop).findColour('A');
+      } catch (Exception ex)
+      {
+        log.warn("Couldn't parse '"+colprop+"' as a colour for "+property);
+        col=null;
+      }
+    }
+    return (col==null) ? defcolour: col;
+  }
 }