Helper to make NinePatchMirage around a box

git-svn-id: svn+ssh://src.earth.threerings.net/nenya/trunk@883 ed5b42cb-e716-0410-a449-f6a68f950b19

src/java/com/threerings/media/image/NinePatchMirage.java

@@ -22,6 +22,7 @@ package com.threerings.media.image;
 
 import java.awt.Graphics2D;
 import java.awt.Rectangle;
+import java.awt.geom.AffineTransform;
 import java.awt.image.BufferedImage;
 
 /**
@@ -46,6 +47,19 @@ public class NinePatchMirage
         _height = height;
     }
 
+    /**
+     * Returns a new Mirage that's a NinePatch stretched and positioned to contain the given
+     * Rectangle.
+     */
+    public static Mirage newNinePatchContaining(NinePatch ninePatch, Rectangle content)
+    {
+        Rectangle bounds = ninePatch.getBoundsSurrounding(content);
+
+        Mirage mirage = new NinePatchMirage(ninePatch, bounds.width, bounds.height);
+        return new TransformedMirage(mirage,
+            AffineTransform.getTranslateInstance(bounds.x, bounds.y), false);
+    }
+
     public long getEstimatedMemoryUsage ()
     {
         return ImageUtil.getEstimatedMemoryUsage(_ninePatch._img.getRaster());