lib/cyberarm_engine/common.rb in cyberarm_engine-0.3.0 vs lib/cyberarm_engine/common.rb in cyberarm_engine-0.4.0

@@ -46,9 +46,15 @@
       else
         return Gosu::Color.rgb(color.red-amount, color.green-amount, color.blue-amount)
       end
     end
 
+    def opacity(color, ratio = 1.0)
+      alpha = 255 * ratio
+
+      return Gosu::Color.rgba(color.red, color.green, color.blue, alpha)
+    end
+
     def get_asset(path, hash, klass)
       asset = nil
       hash.detect do |_asset, instance|
         if _asset == path
           asset = instance
\ No newline at end of file