JAL-98 bespoke fast percentage formatter for consensus tooltip

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

diff --git a/src/jalview/util/Format.java b/src/jalview/util/Format.java
index d14e4ad..7121985 100755 (executable)
--- a/src/jalview/util/Format.java
+++ b/src/jalview/util/Format.java
@@ -947,4 +947,29 @@ public class Format
   {
     return formatString;
   }
+
+  /**
+   * Bespoke method to format percentage float value to the specified number of
+   * decimal places. Avoids use of general-purpose format parsers as a
+   * processing hotspot.
+   * 
+   * @param sb
+   * @param value
+   * @param dp
+   */
+  public static void appendPercentage(StringBuilder sb, float value, int dp)
+  {
+    sb.append((int) value);
+    if (dp > 0)
+    {
+      sb.append(".");
+      while (dp > 0)
+      {
+        value = value - (int) value;
+        value *= 10;
+        sb.append((int) value);
+        dp--;
+      }
+    }
+  }
 }