1 files changed, 17 insertions, 0 deletions
diff --git a/js/blit.js b/js/blit.js
index ac8cb42..367d67b 100644
--- a/js/blit.js
+++ b/js/blit.js
@@ -47,5 +47,22 @@ var blit = (function(){
       }
     })
   }
+  blit.circle = function(A, lex){
+    var hw = brush.w/2|0, hh = brush.h/2|0
+    A.forEach(function(lex,x,y) {
+      var len = Math.sqrt(Math.pow(x-hw,2)+Math.pow(y-hh,2))
+      if (len > Math.abs(hw)) {
+        lex.clear()
+      }
+    })
+  }
+  blit.cross = function(A, lex){
+		A.forEach(function(lex,x,y) {
+			if ((x+y)%2) {
+				lex.clear()
+			}
+		})
+  }
+
   return blit
 })()